： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solu...： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solution has been discussed. The order of Polarographic half-wave potential E1/2 of heteropoly anions is as follows:β 2 >β 1 >β 3 >α . Its reduction process involves an one-electron reduction of Fe? and a pair of two-electron reduction of W? . Epolidation of maleic acid with H2O2 Catalyzed by heteropoly positional isomers was studied.β 3 isomers are the most active.展开更多
A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of ...A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of the cyclic voltammograms was improved obviously. The remarkable advantage of the modified electrode was the high sensitivity and favorable electrocatalytic behavior toward NO - 2. The peak current increased linearly with the concentration of NO - 2 in the range of 8.0×10 -7—0.01 mol/L. The detection limit of NO - 2 was 1.0×10 -9 mol/L. The polyoxometalates nanopaticles modified electrode exhibited almost the same electrochemical behavior after 7 d. It is indicated that the PMo 12-PPy/AGCE has a good reproducibility, stability and wide linearity range.展开更多
The title complex has been synthesized by using terephthalic acid (PTA), 1,10-phenanthroline (phen) and copper monohydrate. It crystallizes in monoclinic space group C2/c with a=2.9590(2) nm, b=1.4664(10) nm, c=1.764 ...The title complex has been synthesized by using terephthalic acid (PTA), 1,10-phenanthroline (phen) and copper monohydrate. It crystallizes in monoclinic space group C2/c with a=2.9590(2) nm, b=1.4664(10) nm, c=1.764 3(12) nm, β=105.593(11)°, V=7.372(9) nm3, Dc=1.489 g·cm-3, Z=8, F(000)=3 416, R1=0.043 6, wR2= 0.1519. The crystal structure shows that the copper atom is coordinated with four nitrogen atoms from two phens and one oxygen atom from one terephthalic acid, forming a distorted square-pyramid coordination geometry. The cyclic voltametric behavior of the complex is also reported. CCDC: 277047.展开更多
文摘： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solution has been discussed. The order of Polarographic half-wave potential E1/2 of heteropoly anions is as follows:β 2 >β 1 >β 3 >α . Its reduction process involves an one-electron reduction of Fe? and a pair of two-electron reduction of W? . Epolidation of maleic acid with H2O2 Catalyzed by heteropoly positional isomers was studied.β 3 isomers are the most active.
文摘A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of the cyclic voltammograms was improved obviously. The remarkable advantage of the modified electrode was the high sensitivity and favorable electrocatalytic behavior toward NO - 2. The peak current increased linearly with the concentration of NO - 2 in the range of 8.0×10 -7—0.01 mol/L. The detection limit of NO - 2 was 1.0×10 -9 mol/L. The polyoxometalates nanopaticles modified electrode exhibited almost the same electrochemical behavior after 7 d. It is indicated that the PMo 12-PPy/AGCE has a good reproducibility, stability and wide linearity range.
文摘The title complex has been synthesized by using terephthalic acid (PTA), 1,10-phenanthroline (phen) and copper monohydrate. It crystallizes in monoclinic space group C2/c with a=2.9590(2) nm, b=1.4664(10) nm, c=1.764 3(12) nm, β=105.593(11)°, V=7.372(9) nm3, Dc=1.489 g·cm-3, Z=8, F(000)=3 416, R1=0.043 6, wR2= 0.1519. The crystal structure shows that the copper atom is coordinated with four nitrogen atoms from two phens and one oxygen atom from one terephthalic acid, forming a distorted square-pyramid coordination geometry. The cyclic voltametric behavior of the complex is also reported. CCDC: 277047.
