Solid phase extraction is widely used in sample pretreatment,concentration and analysis processes due to high selectivity and suitability for low concentration sample system.In this review,we systematically summarized...Solid phase extraction is widely used in sample pretreatment,concentration and analysis processes due to high selectivity and suitability for low concentration sample system.In this review,we systematically summarized and discussed the development trends of solid phase extraction by bibliometrics method.By analyzing papers output scale,the research and development direction of solid phase extraction technology is prospected.We also give an overview on current strategies of novel solid phase extraction from the separation medium and separation technology.The paper aims to describe the global research profile and the development trends of solid phase extraction,to help researchers to accurately grasp the research trend and to provide support for scientific research institutions to formulate scientific policies and strategic plans.Furthermore,the prospect of the development and application of solid phase extraction is also discussed.展开更多
The synthesis of titanium oxo clusters(TOCs)with both chirality and photoactivity is urgently needed to expand their applications.However,this remains a significant challenge due to synthetic difficulties and limitati...The synthesis of titanium oxo clusters(TOCs)with both chirality and photoactivity is urgently needed to expand their applications.However,this remains a significant challenge due to synthetic difficulties and limitations in chiral ligand selection.In this work,we have isolated two pairs of enantiomeric TOCs,[Ti_(3)(μ_(3)-O)(R/S-L1)_(2)(^(i)PrO)_(6)](R/S-Ti_(3);^(i)PrOH=isopropanol,R/S-L1=R/S-2'-hydroxy-[1,1'-binaphthalen]-2-yl isopropyl hydrogenphosphate)and[Ti_(4)(μ_(2)-O)(μ_(4)-O)(R/S-L2)_(2)(EtO)_(8)](R/S-Ti4;EtOH=ethanol,R/S-L2=R/S-2'-hydroxy-[1,1'-binaphthalen]-2-yl ethyl hydrogenphosphate),via an in situ ligand transformation approach.The R/S-L1 and R/S-L2 ligands were obtained by alcoholysis of R/S-L(R/S-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate)in different reaction solvents.These ligands,with additional coordination sites,facilitated the formation of novel TOCs and improved their stability.Importantly,these clusters exhibited exceptional stability in solid state and maintained appreciable stability in solution.Furthermore,the introduction of chiral ligands not only imparts a homochiral nature to R/S-Ti3 and R/S-Ti4 but also confers upon them superior photoelectric properties due to ligand-to-metal charge transfer(LMCT)phenomena,as confirmed by theoretical calculations.This study offers a valuable synthetic strategy for preparing photoactive chiral TOCs,and we anticipate it will inspire new discoveries in the field of chiral metal nanoclusters.展开更多
基金financial support of the Natural Science Foundation of Beijing (2194086)the National Natural Science Foundation of China (Nos. 21922814, 21676273, 21961160745, 31961133019 and 21921005)
文摘Solid phase extraction is widely used in sample pretreatment,concentration and analysis processes due to high selectivity and suitability for low concentration sample system.In this review,we systematically summarized and discussed the development trends of solid phase extraction by bibliometrics method.By analyzing papers output scale,the research and development direction of solid phase extraction technology is prospected.We also give an overview on current strategies of novel solid phase extraction from the separation medium and separation technology.The paper aims to describe the global research profile and the development trends of solid phase extraction,to help researchers to accurately grasp the research trend and to provide support for scientific research institutions to formulate scientific policies and strategic plans.Furthermore,the prospect of the development and application of solid phase extraction is also discussed.
基金financially supported by the National Natural Science Foundation of China(Grant Nos.22325105,22201159,22171164,91961105,92361301,and 52261135637)the Natural Science Foundation of Shandong Province(Nos.ZR2021QB077 and ZR2024MB120)the Doctoral Program of Liaocheng University(No.318051944).
文摘The synthesis of titanium oxo clusters(TOCs)with both chirality and photoactivity is urgently needed to expand their applications.However,this remains a significant challenge due to synthetic difficulties and limitations in chiral ligand selection.In this work,we have isolated two pairs of enantiomeric TOCs,[Ti_(3)(μ_(3)-O)(R/S-L1)_(2)(^(i)PrO)_(6)](R/S-Ti_(3);^(i)PrOH=isopropanol,R/S-L1=R/S-2'-hydroxy-[1,1'-binaphthalen]-2-yl isopropyl hydrogenphosphate)and[Ti_(4)(μ_(2)-O)(μ_(4)-O)(R/S-L2)_(2)(EtO)_(8)](R/S-Ti4;EtOH=ethanol,R/S-L2=R/S-2'-hydroxy-[1,1'-binaphthalen]-2-yl ethyl hydrogenphosphate),via an in situ ligand transformation approach.The R/S-L1 and R/S-L2 ligands were obtained by alcoholysis of R/S-L(R/S-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate)in different reaction solvents.These ligands,with additional coordination sites,facilitated the formation of novel TOCs and improved their stability.Importantly,these clusters exhibited exceptional stability in solid state and maintained appreciable stability in solution.Furthermore,the introduction of chiral ligands not only imparts a homochiral nature to R/S-Ti3 and R/S-Ti4 but also confers upon them superior photoelectric properties due to ligand-to-metal charge transfer(LMCT)phenomena,as confirmed by theoretical calculations.This study offers a valuable synthetic strategy for preparing photoactive chiral TOCs,and we anticipate it will inspire new discoveries in the field of chiral metal nanoclusters.
