Seven transition metal molybdovanadoarsenic heteropoly compounds have been synthesized and characterize d using IR,UV,TG-DTA,pH potential ti tration techniques£(r)The molecular f ormulae of these compounds are pro-po...Seven transition metal molybdovanadoarsenic heteropoly compounds have been synthesized and characterize d using IR,UV,TG-DTA,pH potential ti tration techniques£(r)The molecular f ormulae of these compounds are pro-posed to be HxMyAsMO10V2O40·zH2 O£¨x£1/21?£3£?y£1/2£±£?£2£?M£1/2Cr£?Mn£?Fe£?Co£?Ni£?Cu£?Zn£(c)£(r)They are all keggin structure£(r)Surface nature of these compounds have been investigated by temperature programmed desorption and temperature programmed reducti on techniques£(r)NH 3 -TPD results show that in TPD profile s of the compounds there are two desorption peaks corre sponding to weak acid sites of desorp tion,respectively£(r)Desorbing activativon energy and preexponential factor of weak acid site of desorption for comp ounds have been calculated£(r)H2 -TPR re-sults show that introducting transtion metal to molybdovanarsenic acid,the reduction peak temperatures of H2 -TPR shift regularly with increasing d electron numbers of transition metals£(r)In addition,Zn and Cu heteropoly com-pounds have yet apparent effect of hydrogen spill over£(r)展开更多
A Cu(Ⅰ) complex [Cu(INHPy)(PPh3)2] ·(ClO4)·0.75(C2H5OH) was obtained through self-assembly between [Cu(PPh3)2(MeCN)2]ClO4 and Schiff base 2-pyridylcarboxaldehyde isonicotinoyl hadrazone(INHPy), the structur...A Cu(Ⅰ) complex [Cu(INHPy)(PPh3)2] ·(ClO4)·0.75(C2H5OH) was obtained through self-assembly between [Cu(PPh3)2(MeCN)2]ClO4 and Schiff base 2-pyridylcarboxaldehyde isonicotinoyl hadrazone(INHPy), the structure of which was characterized by elemental analysis, IR spectrum and X-ray diffraction. Single crystal X-ray analysis indicates that this compound crystallizes in triclinic system, space group P1 with parameters: a=1.180 7(2) nm, b=1.330 0(3) nm, c=1.568 6(2) nm. 1.332 g穋m-3, F(000)=1 032, 腎=0.804+23.770C, r=0.995). CCDC: 231388.展开更多
文摘Seven transition metal molybdovanadoarsenic heteropoly compounds have been synthesized and characterize d using IR,UV,TG-DTA,pH potential ti tration techniques£(r)The molecular f ormulae of these compounds are pro-posed to be HxMyAsMO10V2O40·zH2 O£¨x£1/21?£3£?y£1/2£±£?£2£?M£1/2Cr£?Mn£?Fe£?Co£?Ni£?Cu£?Zn£(c)£(r)They are all keggin structure£(r)Surface nature of these compounds have been investigated by temperature programmed desorption and temperature programmed reducti on techniques£(r)NH 3 -TPD results show that in TPD profile s of the compounds there are two desorption peaks corre sponding to weak acid sites of desorp tion,respectively£(r)Desorbing activativon energy and preexponential factor of weak acid site of desorption for comp ounds have been calculated£(r)H2 -TPR re-sults show that introducting transtion metal to molybdovanarsenic acid,the reduction peak temperatures of H2 -TPR shift regularly with increasing d electron numbers of transition metals£(r)In addition,Zn and Cu heteropoly com-pounds have yet apparent effect of hydrogen spill over£(r)
文摘A Cu(Ⅰ) complex [Cu(INHPy)(PPh3)2] ·(ClO4)·0.75(C2H5OH) was obtained through self-assembly between [Cu(PPh3)2(MeCN)2]ClO4 and Schiff base 2-pyridylcarboxaldehyde isonicotinoyl hadrazone(INHPy), the structure of which was characterized by elemental analysis, IR spectrum and X-ray diffraction. Single crystal X-ray analysis indicates that this compound crystallizes in triclinic system, space group P1 with parameters: a=1.180 7(2) nm, b=1.330 0(3) nm, c=1.568 6(2) nm. 1.332 g穋m-3, F(000)=1 032, 腎=0.804+23.770C, r=0.995). CCDC: 231388.