The presence of toxic mercury (Ⅱ) in water is an ever-growing problem on earth that has various harmful effect on human health and aquatic living organisms.Therefore,detection of mercury (Ⅱ) in water is very much cr...The presence of toxic mercury (Ⅱ) in water is an ever-growing problem on earth that has various harmful effect on human health and aquatic living organisms.Therefore,detection of mercury (Ⅱ) in water is very much crucial and several researches are going on in this topic.Metal-organic frameworks (MOFs) are considered as an effective device for sensing of toxic heavy metal ions in water.The tunable functionalities with large surface area of highly semiconducting MOFs enhance its activity towards fluorescence sensing.In this study,we are reporting one highly selective and sensitive luminescent sensor for the detection of mercury (Ⅱ) in water.A series of binary MOF composites were synthesized using in-situ solvothermal synthetic technique for fluorescence sensing of Hg^(2+)in water.The welldistributed graphitic carbon nitride quantum dots on porous zirconium-based MOF improve Hg^(2+)sensing activity in water owing to their great electronic and optical properties.The binary MOF composite (2) i.e.,the sensor exhibited excellent limit of detection (LOD) value of 2.4 nmol/L for Hg^(2+).The sensor also exhibited excellent performance for mercury (Ⅱ)detection in real water samples.The characterizations of the synthesized materials were done using various spectroscopic techniques and the fluorescence sensing mechanism was studied.展开更多
Concerns over exposure to mercury have motivated the exploration of cost-effective,rapid,and reliable method for monitoring Hg^2＋ in the environment.Recently,surface-enhanced Raman scattering（SERS） has become a pro...Concerns over exposure to mercury have motivated the exploration of cost-effective,rapid,and reliable method for monitoring Hg^2＋ in the environment.Recently,surface-enhanced Raman scattering（SERS） has become a promising alternative method for Hg^2＋ analysis.SERS is a spectroscopic technique which combines modern laser spectroscopy with the optical properties of nano-sized noble metal structures,resulting in substantially increased Raman signals.When Hg^2＋ is in a close contact with metallic nanostructures,the SERS effect provides unique structural information together with ultrasensitive detection limits.This review introduces the principles and contemporary approaches of SERS-based Hg^2＋detection.In addition,the perspective and challenges are briefly discussed.展开更多
Two homochiral mercury （1） and cadmium （2） complexes derived from chiral twisted biphenyl pyridine ligand （3,3＇-bipyridine-5,5＇,6,6＇-tetramethyl-2,2＇-dimethoxy-1,1＇-biphenyl） have been synthesized and chara...Two homochiral mercury （1） and cadmium （2） complexes derived from chiral twisted biphenyl pyridine ligand （3,3＇-bipyridine-5,5＇,6,6＇-tetramethyl-2,2＇-dimethoxy-1,1＇-biphenyl） have been synthesized and characterized by IR, microanalysis, TGA, UV-Vis, powder and single-crystal X-ray crystallography. Both 1 and 2 crystallize in orthorhombic space group P21212 with Z = 2. For 1, a = 14.2038（16）, b = 14.3630（17）, c = 7.0257（8）, V = 1433.3（3）3, Mr = 878.91, Dc = 2.037 g/cm3, μ = 7.549 mm-1, F（000） = 824, the final GOF = 1.017, R = 0.0296 and wR = 0.0645 for 2925 observed reflections with I 2σ（I）. For 2, a = 14.212（3）, b = 14.392（3）, c = 7.0498（14）, V = 1442.0（5）3, Mr = 790.72, Dc = 1.821 g/cm3, μ = 2.924 mm–1, F（000） = 760, the final GOF = 1.075, R = 0.0340 and wR = 0.0834 for 3144 observed reflections with I 2σ（I）. The crystal structures of 1 and 2 are isostructural and each adopts a two-dimensional supramolecular network which contains the C–H···π interactions.展开更多
CdSe/CdS quantum dots （QDs） functionalized by thiourea （TU） were synthesized and used as a fluorescent sensor for mercury ion detection. The TU-functionalized QDs were prepared by bonding TU via electrostatic inte...CdSe/CdS quantum dots （QDs） functionalized by thiourea （TU） were synthesized and used as a fluorescent sensor for mercury ion detection. The TU-functionalized QDs were prepared by bonding TU via electrostatic interaction to the core/shell CdSe/CdS QDs after capping with thioglycolic acid （TGA）. It was observed that the fluorescence of the functionalized QDs was quenched upon the addition of Hg^2＋. The quantitative detection of Hg^2＋ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg^2＋ added in the range of 1-300 μg.L^-1, A detection limit of 0.56 μg.L^-1 was achieved. The sensor showed superior selectivity for Hg^2＋ and was successfully applied to the determination of mercury in environmental samples with satisfactory results展开更多
Mercury ions have been considered highly toxic to human health. What would be great is to develop the ionic probes without any toxicities themselves. Here, we report a friendly, highly sensitive mercury(II) ionic prob...Mercury ions have been considered highly toxic to human health. What would be great is to develop the ionic probes without any toxicities themselves. Here, we report a friendly, highly sensitive mercury(II) ionic probe, watersoluble photoluminescence carbon dots which were synthesized by simply hydrothermal treatment of fresh cherry tomatoes without adding any other reagents. The ultra-small(\1 nm) carbon dots show robust excitation-depended photoluminescence under a wide p H range(4–10) or a strong ionic strength of up to 1 M, and the detection limit of mercury(II) has been determined as low as 18 n M. We envision such water-soluble, biocompatible carbon dots that could be applied to biolabeling, bio-imaging, and biosensing fields.展开更多
An Eastman-AQ/Ni(II)chemically modified electrode(CME) produced by“double coating steps”deposition of Eastman-AQ/Ni(II) film and Ni(II)-coating crystalline species onto glassy carbon instead of metallic nickel elect...An Eastman-AQ/Ni(II)chemically modified electrode(CME) produced by“double coating steps”deposition of Eastman-AQ/Ni(II) film and Ni(II)-coating crystalline species onto glassy carbon instead of metallic nickel electrode exhibited stable electrocatalytic oxidation of numerous ∝-hydrogen compounds including carbohydrates, amines and amino acids.Determination of glucose in FIA on the CME, the linear response concentration range was bstween 1.0×10^(-5) and 5.0×10^(-2) mol/L and the detection limit was 5.0×10^(-6)mol/L.The stability of the CME was adequate for routine quantitative application.展开更多
Objective: The objective of the study is to verify the clinical validity of the following kits with the comparative experimental analysis and evaluate whether their performance can meet the clinical requirements, i.e....Objective: The objective of the study is to verify the clinical validity of the following kits with the comparative experimental analysis and evaluate whether their performance can meet the clinical requirements, i.e. Class III in vitro diagnostic reagent “Herpes Simplex Virus (HSV) Type II Nucleic Acid Detection Kit (PCR-Fluorescence Probe Method)” of Daan Gene Co., Ltd. (Daan kit for short) and “Herpes Simplex Virus (HSV) Type II Nucleic Acid Detection Kit (Fluorescence PCR Method)” of Wuhan Biot Gene Co., Ltd. (Biot kit for short). Method: In the study process, the samples were divided into positive and negative groups according to the control test results, and the clinical application performance of Daan kit and Biot kit was evaluated by comparing their test results. Results: The results show that two kits indicate the same test results, i.e. 26 positive and 107 negative samples in a total of 133 male urethral discharge samples, and 32 positive and 238 negative samples in a total of 270 female cervical secretion samples. Conclusion: It can be concluded from the clinical test that Daan and Biot Herpes Simplex Virus (HSV) Type II Nuc- leic Acid Test Kits are reliable, accurate, safe, convenient for use, stable and high-value in the clinical application.展开更多
IIS Web站点的文件安全是一个令人难以放心的问题.利用微软提供的FSO(File System Object)可编写基于Web的远程文件管理程序,但是由于它的开放性也为安全带来隐患.通过调用自主研制的组件来检测站点文件的变化,并给予报警和处理,可实现...IIS Web站点的文件安全是一个令人难以放心的问题.利用微软提供的FSO(File System Object)可编写基于Web的远程文件管理程序,但是由于它的开放性也为安全带来隐患.通过调用自主研制的组件来检测站点文件的变化,并给予报警和处理,可实现Web站点文件状况的远程监控.同时,系统还支持定时检测处理.展开更多
Due to the high affinity between dithiocarbamate （DTC） and Hg2＋, a fluorescent probe based on squaraine chromophore with DTC side arm for Hg2＋ via coordination induced deaggregation signaling has been designed and...Due to the high affinity between dithiocarbamate （DTC） and Hg2＋, a fluorescent probe based on squaraine chromophore with DTC side arm for Hg2＋ via coordination induced deaggregation signaling has been designed and synthesized. Squaraine has a high tendency to aggregate in aqueous solution, and such self-aggregation usually results in a dramatic absorption spectral broadening with fluorescence emission quenching. The combination of the DTC side arm of the probe with Hg2＋ induces steric hindrance, leading to the deaggregation of the dye complex, companying with a fluorescence emission restoration. In EtOH-H2O （20：80, v/v） solution, this ＂turn on＂ fluorescent probe has high selectivity and sensitivity toward Hg2＋ over other metal ions, and the limit of detection for Hg2＋ was estimated as 2.19 × 10^-8 mol/L by 3σ/k.展开更多
With increasing industrial activities,mercury has been largely discharged into environment and caused serious environmental problems.The growing level of mercury pollution has become a huge threat to human health due ...With increasing industrial activities,mercury has been largely discharged into environment and caused serious environmental problems.The growing level of mercury pollution has become a huge threat to human health due to its significant biotoxicity.Therefore,the simple and fast means for on-site monitoring discharged mercury pollution are highly necessary to protect human beings from its pernicious effects in time.Herein,a"turn off"fluorescent biosensor(mCherry L199 C)for sensing Hg2+was successfully designed based on direct modification of the chromophore environment of fluorescent protein mCherry.For rapid screening and characterization,the designed variant of mCherry(mCherry L199 C)was directly expressed on outer-membrane of Escherichia coli cells by cell surface display technique.The fluorescent biosensor was characterized to have favorable response to Hg2+at micromole level among other metal ions and over a broad pH range.Further,the cells of the fluorescent biosensor were encapsulated in alginate hydrogel to develop the cells-alginate hydrogel-based paper.The cells-alginate hydrogel-based paper could detect mercury pollution in 5 min with simple operation process and inexpensive equipment,and it could keep fluorescence and activity stable at 4℃ for 24 hr,which would be a high-throughput screening tool in preliminarily reporting the presence of mercury pollution in natural setting.展开更多
Biomass-derived carbon dots(C-dots)are considered a very important carbon material in metal ion detection of their small environmental impact,simple preparation process,and relatively low cost.A green approach for syn...Biomass-derived carbon dots(C-dots)are considered a very important carbon material in metal ion detection of their small environmental impact,simple preparation process,and relatively low cost.A green approach for synthesizing biomass-derived C-dots from Chenpi using a hydrothermal method without further processing is proposed in the present study.The as-synthesized C-dots show excellent fluorescence properties,superior resistance to UV irradiation photobleaching,and high photostability in salt-containing solutions.The C-dots were used in the form of label-free fluorescent probes for sensitively detecting Hg^(2+)selectively.The outcome relationship behaved linearly and was established based on a given range between 10–300 nM concentration,with a detection limit of 7.0 nM.This green strategy obtains a high C-dot quantum yield of 10.8%and satisfactory results in detecting Hg^(2+)in actual water samples.展开更多
Although many plasmonic nanosenosrs have been established for the detection of mercury(Ⅱ)(Hg^(2+)),few of them is feasible for analyzing natural samples with very complex matrices because of insufficient method selec...Although many plasmonic nanosenosrs have been established for the detection of mercury(Ⅱ)(Hg^(2+)),few of them is feasible for analyzing natural samples with very complex matrices because of insufficient method selectivity.To address this challenge,we propose an epitaxial and lattice-mismatch approach to the synthesis of a unique Au/Ag_(2)S dimeric nanostructure,which consists of an Au segment with excellent plasmonic characteristics,and a highly stable Ag_(2)S portion with minimum solubility product (K_(sp)(Ag_(2)S)=6.3×10^(-50)).The detection relies on the chemical conversion of Ag_(2)S to HgS when reacting with Hg^(2+),resulting in a red shift in the absorption band of the connecting Au NPs.The concurrent color changes of the solution from gray purple to dark green and finally to navy correlate well with Hg^(2+)concentration,thus enables UV-vis quantitation and a naked-eye readout of the Hg^(2+)concentration.This method exhibits superior selectivity towards Hg^(2+) over other interfering ions tested because Hg^(2+) is the only ion that can react with Ag_(2)S to form HgS with even smaller solubility product (K_(sp)(HgS)=4×10^(-53)).The detection limit of this method is 1.21μmol/L,calculated by the signal-to-noise of 3.The practicability of the method was verified by analyzing the Hg^(2+)in sewage water samples without sample pretreatment with satisfactory recoveries (93.1%-102.8%) and relative standard deviations (1.38%-2.89%).We believe this method holds great potential for on-the-spot detection of Hg^(2+) in environmental water samples with complex matrices.展开更多
A mercury （II） complex with 4.5-benzo-1.2-dithiol-3-thione （C7H4S3） （1）, [Hg2I4（C7H4S3）2] （2） was synthesized. The structure of the obtained complex （2） was characterized by crystallography, Infrared Spect...A mercury （II） complex with 4.5-benzo-1.2-dithiol-3-thione （C7H4S3） （1）, [Hg2I4（C7H4S3）2] （2） was synthesized. The structure of the obtained complex （2） was characterized by crystallography, Infrared Spectroscopy （IR） analysis and theoretical study. The complex （2） has a dimeric structure, where each mercury atom takes a tetrahedral geometry and is coordinated by two bridging chloride, one terminal chloride and one thiocarbonyl sulfur atom （C=S） of the ligand.展开更多
文摘The presence of toxic mercury (Ⅱ) in water is an ever-growing problem on earth that has various harmful effect on human health and aquatic living organisms.Therefore,detection of mercury (Ⅱ) in water is very much crucial and several researches are going on in this topic.Metal-organic frameworks (MOFs) are considered as an effective device for sensing of toxic heavy metal ions in water.The tunable functionalities with large surface area of highly semiconducting MOFs enhance its activity towards fluorescence sensing.In this study,we are reporting one highly selective and sensitive luminescent sensor for the detection of mercury (Ⅱ) in water.A series of binary MOF composites were synthesized using in-situ solvothermal synthetic technique for fluorescence sensing of Hg^(2+)in water.The welldistributed graphitic carbon nitride quantum dots on porous zirconium-based MOF improve Hg^(2+)sensing activity in water owing to their great electronic and optical properties.The binary MOF composite (2) i.e.,the sensor exhibited excellent limit of detection (LOD) value of 2.4 nmol/L for Hg^(2+).The sensor also exhibited excellent performance for mercury (Ⅱ)detection in real water samples.The characterizations of the synthesized materials were done using various spectroscopic techniques and the fluorescence sensing mechanism was studied.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB14020201)the National Natural Science Foundation of China (Nos. 21337004, 21321004)
文摘Concerns over exposure to mercury have motivated the exploration of cost-effective,rapid,and reliable method for monitoring Hg^2＋ in the environment.Recently,surface-enhanced Raman scattering（SERS） has become a promising alternative method for Hg^2＋ analysis.SERS is a spectroscopic technique which combines modern laser spectroscopy with the optical properties of nano-sized noble metal structures,resulting in substantially increased Raman signals.When Hg^2＋ is in a close contact with metallic nanostructures,the SERS effect provides unique structural information together with ultrasensitive detection limits.This review introduces the principles and contemporary approaches of SERS-based Hg^2＋detection.In addition,the perspective and challenges are briefly discussed.
基金supported by NNSFC (20971085)"973" Programs (2007CB209701 and 2009CB930403)the Key Project and Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry
文摘Two homochiral mercury （1） and cadmium （2） complexes derived from chiral twisted biphenyl pyridine ligand （3,3＇-bipyridine-5,5＇,6,6＇-tetramethyl-2,2＇-dimethoxy-1,1＇-biphenyl） have been synthesized and characterized by IR, microanalysis, TGA, UV-Vis, powder and single-crystal X-ray crystallography. Both 1 and 2 crystallize in orthorhombic space group P21212 with Z = 2. For 1, a = 14.2038（16）, b = 14.3630（17）, c = 7.0257（8）, V = 1433.3（3）3, Mr = 878.91, Dc = 2.037 g/cm3, μ = 7.549 mm-1, F（000） = 824, the final GOF = 1.017, R = 0.0296 and wR = 0.0645 for 2925 observed reflections with I 2σ（I）. For 2, a = 14.212（3）, b = 14.392（3）, c = 7.0498（14）, V = 1442.0（5）3, Mr = 790.72, Dc = 1.821 g/cm3, μ = 2.924 mm–1, F（000） = 760, the final GOF = 1.075, R = 0.0340 and wR = 0.0834 for 3144 observed reflections with I 2σ（I）. The crystal structures of 1 and 2 are isostructural and each adopts a two-dimensional supramolecular network which contains the C–H···π interactions.
基金the financial support from the National Natural Science Foundation of China (Nos. 20345006 and 20575043)
文摘CdSe/CdS quantum dots （QDs） functionalized by thiourea （TU） were synthesized and used as a fluorescent sensor for mercury ion detection. The TU-functionalized QDs were prepared by bonding TU via electrostatic interaction to the core/shell CdSe/CdS QDs after capping with thioglycolic acid （TGA）. It was observed that the fluorescence of the functionalized QDs was quenched upon the addition of Hg^2＋. The quantitative detection of Hg^2＋ with this fluorescent sensor could be conducted based on the linear relationship between the extent of quenching and the concentration of Hg^2＋ added in the range of 1-300 μg.L^-1, A detection limit of 0.56 μg.L^-1 was achieved. The sensor showed superior selectivity for Hg^2＋ and was successfully applied to the determination of mercury in environmental samples with satisfactory results
基金supported by Grants from the National Natural Science Foundation of China (Nos. 21171086 and 81160213)Inner Mongolia Grassland Talent (No. 108-108038)+2 种基金Natural Science Foundation of Inner Mongolia Autonomous Region of China (Nos. 2013MS1121 and 2015MS0806)Inner Mongolia Department of Science and Technology (No. 211-202077)the Inner Mongolia Agricultural University (Nos. 109-108040, 211-109003, and 211-206038)
文摘Mercury ions have been considered highly toxic to human health. What would be great is to develop the ionic probes without any toxicities themselves. Here, we report a friendly, highly sensitive mercury(II) ionic probe, watersoluble photoluminescence carbon dots which were synthesized by simply hydrothermal treatment of fresh cherry tomatoes without adding any other reagents. The ultra-small(\1 nm) carbon dots show robust excitation-depended photoluminescence under a wide p H range(4–10) or a strong ionic strength of up to 1 M, and the detection limit of mercury(II) has been determined as low as 18 n M. We envision such water-soluble, biocompatible carbon dots that could be applied to biolabeling, bio-imaging, and biosensing fields.
文摘An Eastman-AQ/Ni(II)chemically modified electrode(CME) produced by“double coating steps”deposition of Eastman-AQ/Ni(II) film and Ni(II)-coating crystalline species onto glassy carbon instead of metallic nickel electrode exhibited stable electrocatalytic oxidation of numerous ∝-hydrogen compounds including carbohydrates, amines and amino acids.Determination of glucose in FIA on the CME, the linear response concentration range was bstween 1.0×10^(-5) and 5.0×10^(-2) mol/L and the detection limit was 5.0×10^(-6)mol/L.The stability of the CME was adequate for routine quantitative application.
文摘Objective: The objective of the study is to verify the clinical validity of the following kits with the comparative experimental analysis and evaluate whether their performance can meet the clinical requirements, i.e. Class III in vitro diagnostic reagent “Herpes Simplex Virus (HSV) Type II Nucleic Acid Detection Kit (PCR-Fluorescence Probe Method)” of Daan Gene Co., Ltd. (Daan kit for short) and “Herpes Simplex Virus (HSV) Type II Nucleic Acid Detection Kit (Fluorescence PCR Method)” of Wuhan Biot Gene Co., Ltd. (Biot kit for short). Method: In the study process, the samples were divided into positive and negative groups according to the control test results, and the clinical application performance of Daan kit and Biot kit was evaluated by comparing their test results. Results: The results show that two kits indicate the same test results, i.e. 26 positive and 107 negative samples in a total of 133 male urethral discharge samples, and 32 positive and 238 negative samples in a total of 270 female cervical secretion samples. Conclusion: It can be concluded from the clinical test that Daan and Biot Herpes Simplex Virus (HSV) Type II Nuc- leic Acid Test Kits are reliable, accurate, safe, convenient for use, stable and high-value in the clinical application.
文摘IIS Web站点的文件安全是一个令人难以放心的问题.利用微软提供的FSO(File System Object)可编写基于Web的远程文件管理程序,但是由于它的开放性也为安全带来隐患.通过调用自主研制的组件来检测站点文件的变化,并给予报警和处理,可实现Web站点文件状况的远程监控.同时,系统还支持定时检测处理.
基金financially supported by the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China (No.J1103303)the National Natural Science Foundation of China (No.20702005)+2 种基金the Fujian Provincial Department of Science and Technology,China (No.2013Y0062)Funding (Type A) from Fujian Education Department,PR China (Nos.JA12038 and JA13043)the Science and Technology Development Fund of Fuzhou University,China (No.600902)
文摘Due to the high affinity between dithiocarbamate （DTC） and Hg2＋, a fluorescent probe based on squaraine chromophore with DTC side arm for Hg2＋ via coordination induced deaggregation signaling has been designed and synthesized. Squaraine has a high tendency to aggregate in aqueous solution, and such self-aggregation usually results in a dramatic absorption spectral broadening with fluorescence emission quenching. The combination of the DTC side arm of the probe with Hg2＋ induces steric hindrance, leading to the deaggregation of the dye complex, companying with a fluorescence emission restoration. In EtOH-H2O （20：80, v/v） solution, this ＂turn on＂ fluorescent probe has high selectivity and sensitivity toward Hg2＋ over other metal ions, and the limit of detection for Hg2＋ was estimated as 2.19 × 10^-8 mol/L by 3σ/k.
基金supported by the Natural Science Foundation of Guangxi Province(No.2018JJB120049)National Natural Science Foundation of China(No.31800631)+1 种基金the BAGUI Scholar Program of Guangxi Province of China。
文摘With increasing industrial activities,mercury has been largely discharged into environment and caused serious environmental problems.The growing level of mercury pollution has become a huge threat to human health due to its significant biotoxicity.Therefore,the simple and fast means for on-site monitoring discharged mercury pollution are highly necessary to protect human beings from its pernicious effects in time.Herein,a"turn off"fluorescent biosensor(mCherry L199 C)for sensing Hg2+was successfully designed based on direct modification of the chromophore environment of fluorescent protein mCherry.For rapid screening and characterization,the designed variant of mCherry(mCherry L199 C)was directly expressed on outer-membrane of Escherichia coli cells by cell surface display technique.The fluorescent biosensor was characterized to have favorable response to Hg2+at micromole level among other metal ions and over a broad pH range.Further,the cells of the fluorescent biosensor were encapsulated in alginate hydrogel to develop the cells-alginate hydrogel-based paper.The cells-alginate hydrogel-based paper could detect mercury pollution in 5 min with simple operation process and inexpensive equipment,and it could keep fluorescence and activity stable at 4℃ for 24 hr,which would be a high-throughput screening tool in preliminarily reporting the presence of mercury pollution in natural setting.
基金financially supported by the Development Program of Hunan Province (No.2020SK2128).
文摘Biomass-derived carbon dots(C-dots)are considered a very important carbon material in metal ion detection of their small environmental impact,simple preparation process,and relatively low cost.A green approach for synthesizing biomass-derived C-dots from Chenpi using a hydrothermal method without further processing is proposed in the present study.The as-synthesized C-dots show excellent fluorescence properties,superior resistance to UV irradiation photobleaching,and high photostability in salt-containing solutions.The C-dots were used in the form of label-free fluorescent probes for sensitively detecting Hg^(2+)selectively.The outcome relationship behaved linearly and was established based on a given range between 10–300 nM concentration,with a detection limit of 7.0 nM.This green strategy obtains a high C-dot quantum yield of 10.8%and satisfactory results in detecting Hg^(2+)in actual water samples.
基金supported by the National Natural Science Foundation of China(No.21876206)the Key Fundamental Project of Shandong Natural Science Foundation(No.ZR2020ZD13)+1 种基金the Science and Technology Projects of Qingdao(No.21–1–4-sf-7-nsh)the Youth Innovation and Technology project of Universities in Shandong Province(No.2020KJC007)。
文摘Although many plasmonic nanosenosrs have been established for the detection of mercury(Ⅱ)(Hg^(2+)),few of them is feasible for analyzing natural samples with very complex matrices because of insufficient method selectivity.To address this challenge,we propose an epitaxial and lattice-mismatch approach to the synthesis of a unique Au/Ag_(2)S dimeric nanostructure,which consists of an Au segment with excellent plasmonic characteristics,and a highly stable Ag_(2)S portion with minimum solubility product (K_(sp)(Ag_(2)S)=6.3×10^(-50)).The detection relies on the chemical conversion of Ag_(2)S to HgS when reacting with Hg^(2+),resulting in a red shift in the absorption band of the connecting Au NPs.The concurrent color changes of the solution from gray purple to dark green and finally to navy correlate well with Hg^(2+)concentration,thus enables UV-vis quantitation and a naked-eye readout of the Hg^(2+)concentration.This method exhibits superior selectivity towards Hg^(2+) over other interfering ions tested because Hg^(2+) is the only ion that can react with Ag_(2)S to form HgS with even smaller solubility product (K_(sp)(HgS)=4×10^(-53)).The detection limit of this method is 1.21μmol/L,calculated by the signal-to-noise of 3.The practicability of the method was verified by analyzing the Hg^(2+)in sewage water samples without sample pretreatment with satisfactory recoveries (93.1%-102.8%) and relative standard deviations (1.38%-2.89%).We believe this method holds great potential for on-the-spot detection of Hg^(2+) in environmental water samples with complex matrices.
文摘A mercury （II） complex with 4.5-benzo-1.2-dithiol-3-thione （C7H4S3） （1）, [Hg2I4（C7H4S3）2] （2） was synthesized. The structure of the obtained complex （2） was characterized by crystallography, Infrared Spectroscopy （IR） analysis and theoretical study. The complex （2） has a dimeric structure, where each mercury atom takes a tetrahedral geometry and is coordinated by two bridging chloride, one terminal chloride and one thiocarbonyl sulfur atom （C=S） of the ligand.
