In this work, ZnSn（OH）6with a cubic structure is successfully synthesized by one-step hydrothermal method without any catalyst. The response and recovery characteristics of gas sensing were investigated against vari...In this work, ZnSn（OH）6with a cubic structure is successfully synthesized by one-step hydrothermal method without any catalyst. The response and recovery characteristics of gas sensing were investigated against various gases via quartz crystal microbalance（QCM） at room temperature. The sensor exhibited high sensitivity and good selectivity toward CO gas. Moreover, a linear dependence of log^（àDelta F）about CO concentration was obtained. It is demonstrated that the QCM sensor coated cubic ZnSn（OH）6could be a suitable candidate for detecting CO.展开更多
In this research,we present the first examples of Mo_(3)^(IV)-W^(VI)hybrid polyoxometalates(Mo_(3)^(IV)-POMs)with empty Keggin structures:α-[Mo_(3)^(IV)Mo^(VI)W_(8)^(VI)O_(31)(OH)_(6)py_(3)]·2Hpy·4H_(2)O(1&...In this research,we present the first examples of Mo_(3)^(IV)-W^(VI)hybrid polyoxometalates(Mo_(3)^(IV)-POMs)with empty Keggin structures:α-[Mo_(3)^(IV)Mo^(VI)W_(8)^(VI)O_(31)(OH)_(6)py_(3)]·2Hpy·4H_(2)O(1·2Hpy·4H_(2)O),γ-[Mo_(6)^(IV)W_(6)^(VI)O_(28)(OH)_(6)py_(6)]·2[H_(2)N(CH_(3))_(2)]·6.5H_(2)O(2·2[H_(2)N(CH_(3))_(2)]·6.5H_(2)O),γ-[Mo_(6)^(IV)W_(6)^(VI)O_(29)(OH)_(5)py_(6)Na(H_(2)O)_(5)]·2[NH_(2)(CH_(3))_(2)]·2H_(2)O(3·2[NH_(2)(CH_(3))_(2)]·2H_(2)O)andγ-[{Mo_(6)^(IV)Mo^(VI)W_(5)^(VI)O_(28)(OH)_(6)py_(6)}_(5)Znpy_(4)]·2Hpy·8H_(2)O(4·2Hpy·8H_(2)O).They were prepared through the solvothermal partial oxidation of a mixture of triangular bioxo-capped hexacarboxylate clusters[Mo_(x)^(IV)W_(3-x)^(IV)O_(2)(O_(2)CCH_(3))_(6)L_(3)]q(x=0-3,L=H_(2)O,q=^(2+);L=CH_(3)CO_(2)^(-),q=-1),providing a feasible route to the designed synthesis of mixed Mo_(3)^(IV)-W POMs.The much lower yield and poor repeatability of 1 compared to those of 2,3,and 4 are ascribed to the fact that the triangularly Mo^(IV)-Mo^(IV)bonded Mo_(3)^(IV)Lewis acid cluster unit of the former results from the breakage of M^(IV)-W^(IV)bonds(M=Mo,W)and recombination of Mo^(IV)in the Na[Mo^(IV)W^(IV)_(2)O_(2)(O_(2)CCH_(3))_(9)]precursor because of the extremely easy oxidation of W^(IV)to W^(VI)as compared to Mo^(IV).2,3,and 4 exhibit highly LCF-dependent(LCF=Lewis catalysis field)hydrogen transfer catalysis performance in the hydrazine reduction of nitrobenzene to aniline.展开更多
基金financially supported by the Key Project of Sichuan provincial Education office(No.13ZA0183)Applied Basic Research Programs of Sichuan Provincial Science and Technology Office(No.2014JY0059)+1 种基金Foundation of Youth Science and Technology Innovation Team of Sichuan Province(No.2015TD0007)Program for New Century Excellent Talents in University of Ministof Education of China(No.NCET-13-0983)
文摘In this work, ZnSn（OH）6with a cubic structure is successfully synthesized by one-step hydrothermal method without any catalyst. The response and recovery characteristics of gas sensing were investigated against various gases via quartz crystal microbalance（QCM） at room temperature. The sensor exhibited high sensitivity and good selectivity toward CO gas. Moreover, a linear dependence of log^（àDelta F）about CO concentration was obtained. It is demonstrated that the QCM sensor coated cubic ZnSn（OH）6could be a suitable candidate for detecting CO.
基金supported by the National Natural Science Foundation of China(21873102).
文摘In this research,we present the first examples of Mo_(3)^(IV)-W^(VI)hybrid polyoxometalates(Mo_(3)^(IV)-POMs)with empty Keggin structures:α-[Mo_(3)^(IV)Mo^(VI)W_(8)^(VI)O_(31)(OH)_(6)py_(3)]·2Hpy·4H_(2)O(1·2Hpy·4H_(2)O),γ-[Mo_(6)^(IV)W_(6)^(VI)O_(28)(OH)_(6)py_(6)]·2[H_(2)N(CH_(3))_(2)]·6.5H_(2)O(2·2[H_(2)N(CH_(3))_(2)]·6.5H_(2)O),γ-[Mo_(6)^(IV)W_(6)^(VI)O_(29)(OH)_(5)py_(6)Na(H_(2)O)_(5)]·2[NH_(2)(CH_(3))_(2)]·2H_(2)O(3·2[NH_(2)(CH_(3))_(2)]·2H_(2)O)andγ-[{Mo_(6)^(IV)Mo^(VI)W_(5)^(VI)O_(28)(OH)_(6)py_(6)}_(5)Znpy_(4)]·2Hpy·8H_(2)O(4·2Hpy·8H_(2)O).They were prepared through the solvothermal partial oxidation of a mixture of triangular bioxo-capped hexacarboxylate clusters[Mo_(x)^(IV)W_(3-x)^(IV)O_(2)(O_(2)CCH_(3))_(6)L_(3)]q(x=0-3,L=H_(2)O,q=^(2+);L=CH_(3)CO_(2)^(-),q=-1),providing a feasible route to the designed synthesis of mixed Mo_(3)^(IV)-W POMs.The much lower yield and poor repeatability of 1 compared to those of 2,3,and 4 are ascribed to the fact that the triangularly Mo^(IV)-Mo^(IV)bonded Mo_(3)^(IV)Lewis acid cluster unit of the former results from the breakage of M^(IV)-W^(IV)bonds(M=Mo,W)and recombination of Mo^(IV)in the Na[Mo^(IV)W^(IV)_(2)O_(2)(O_(2)CCH_(3))_(9)]precursor because of the extremely easy oxidation of W^(IV)to W^(VI)as compared to Mo^(IV).2,3,and 4 exhibit highly LCF-dependent(LCF=Lewis catalysis field)hydrogen transfer catalysis performance in the hydrazine reduction of nitrobenzene to aniline.
