Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel o...Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials,(C_(3)H_(5)N_(2))Sb F_(2)SO_(4)(I)and(C_(5)H_(6)N)Sb F_(2)SO_(4)(Ⅱ),which were obtained by introducing Sb^(3+)cation containing stereochemically active lone-pair(SCALP)and organicπ-conjugated cations into sulphate system.The synergistic interactions of the organicπ-conjugated cations,the inorganic[SbO_(2)F_(2)]^(3-)seesaw anions and the[SO_(4)]^(2-)distorted tetrahedra anions make their ultraviolet(UV)absorption edges approach 297 and 283 nm,respectively,and raise their birefringence up to 0.193@546 nm and 0.179@546 nm,respectively.Interestingly,although the two compounds have the same stoichiometric ratio and similar one-dimensional(1D)chain structure,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large secondharmonic generation(SHG)response(1.6 times that of KH_(2)PO_(4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.展开更多
Birefringent materials with large optical anisotropy,which can be used to modulate the polarization of light,play a key role in laser techniques and science.However,the exploration studies of new,superior birefringent...Birefringent materials with large optical anisotropy,which can be used to modulate the polarization of light,play a key role in laser techniques and science.However,the exploration studies of new,superior birefringent materials develop extremely slowly due to the lack of effective guidelines for rational design.Herein,three antimony(Ⅲ)fluoride oxalates,namely,Na_(2)Sb_(2)(C_(2)O_(4))F_(6),K_(2)Sb_(2)(C_(2)O_(4))F_(6),and Cs_(2)Sb_(2)-(C_(2)O_(4))_(2)F_(4)·H_(2)O,were successfully synthesized through a rational combination ofπ-conjugated C_(2)O_(4)^(2-)anions and Sb^(3+)cations with stereochemically active lone pairs.These oxalates feature unique quasi-one-dimensional chain structures that induce large optical anisotropy.Remarkably,Cs_(2)Sb_(2)(C_(2)O_(4))_(2)-F_(4)·H_(2)O exhibits the largest birefringence(0.325@546 nm)among all reported antimony(Ⅲ)-based oxysalts.Detailed structural analysis and theoretical calculations confirmed that the optical anisotropy of these oxalates could be tuned through the synergetic interactions of templated cations and anionic functional groups.This work may open the door to efficiently designing excellent birefringent materials and guide the further discovery of other novel structure-driven functional materials.展开更多
The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized an...The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized and tested in NH 3-Selective catalytic reduction（SCR） of NO,and the samples were characterized by the Brunaller,Emmett and Teller（BET absorbed gas N 2）,X-ray diffraction（XRD）,high resolution transmission electron microscopy（HR-TEM）,and temperature programmed desorption（TPD NH 3） techniques.The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity.The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature.It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH 3-SCR of NO.展开更多
基金supported by the National Natural Science Foundation of China(Nos.22122106,22071158,21971171,22305166)the Fundamental Research Funds from Sichuan University(No.2021SCUNL101)the Natural Science Foundation of Sichuan Province(No.2023NSFC1066)。
文摘Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials,(C_(3)H_(5)N_(2))Sb F_(2)SO_(4)(I)and(C_(5)H_(6)N)Sb F_(2)SO_(4)(Ⅱ),which were obtained by introducing Sb^(3+)cation containing stereochemically active lone-pair(SCALP)and organicπ-conjugated cations into sulphate system.The synergistic interactions of the organicπ-conjugated cations,the inorganic[SbO_(2)F_(2)]^(3-)seesaw anions and the[SO_(4)]^(2-)distorted tetrahedra anions make their ultraviolet(UV)absorption edges approach 297 and 283 nm,respectively,and raise their birefringence up to 0.193@546 nm and 0.179@546 nm,respectively.Interestingly,although the two compounds have the same stoichiometric ratio and similar one-dimensional(1D)chain structure,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large secondharmonic generation(SHG)response(1.6 times that of KH_(2)PO_(4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.
基金supported by the National Natural Science Foundation of China(22122106,22071158,21971171,and21875146)National Research Foundation of Korea(NRF)funded by the Ministry of Science and International Cooperation of Technology(2019R1A2C3005530)。
文摘Birefringent materials with large optical anisotropy,which can be used to modulate the polarization of light,play a key role in laser techniques and science.However,the exploration studies of new,superior birefringent materials develop extremely slowly due to the lack of effective guidelines for rational design.Herein,three antimony(Ⅲ)fluoride oxalates,namely,Na_(2)Sb_(2)(C_(2)O_(4))F_(6),K_(2)Sb_(2)(C_(2)O_(4))F_(6),and Cs_(2)Sb_(2)-(C_(2)O_(4))_(2)F_(4)·H_(2)O,were successfully synthesized through a rational combination ofπ-conjugated C_(2)O_(4)^(2-)anions and Sb^(3+)cations with stereochemically active lone pairs.These oxalates feature unique quasi-one-dimensional chain structures that induce large optical anisotropy.Remarkably,Cs_(2)Sb_(2)(C_(2)O_(4))_(2)-F_(4)·H_(2)O exhibits the largest birefringence(0.325@546 nm)among all reported antimony(Ⅲ)-based oxysalts.Detailed structural analysis and theoretical calculations confirmed that the optical anisotropy of these oxalates could be tuned through the synergetic interactions of templated cations and anionic functional groups.This work may open the door to efficiently designing excellent birefringent materials and guide the further discovery of other novel structure-driven functional materials.
基金supported by National Natural Science Foundation of China (21106071 and 50872052)National High-Tech Research and Development Program of China (863 Program,2009AA05Z313)+1 种基金New Teachers' Fund for Doctor Stations the Ministry of Education of China(20113221120004)Research Subject of Environmental Protection Department of Jiangsu Province of China (201016)
文摘The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized and tested in NH 3-Selective catalytic reduction（SCR） of NO,and the samples were characterized by the Brunaller,Emmett and Teller（BET absorbed gas N 2）,X-ray diffraction（XRD）,high resolution transmission electron microscopy（HR-TEM）,and temperature programmed desorption（TPD NH 3） techniques.The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity.The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature.It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH 3-SCR of NO.
