Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffracti...Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffraction techniques. The crystal belongs to triclinic, space group P1. The cell parameters are: a = 0. 7489(l ) um, b = 0. 7914(2) nm, c = 1. 8139(3) nm, a = 89. 39(2)°, β = 89. 37(l） °,γ = 63. 18(2)°, Dc = 2. 1g. cm-3, Z = 2, R = 0. 0319. In the compound, all of five nitrates are bidentate and one molecule of water is monodentate, the coordination number of Ce (Ⅲ) is 11. The processes of thermal decomposition of the compound was proposed by its TG curve.展开更多
The present status of the research on heteropolytungstates containing XW 9O 33 9- (X=As Ⅲ,Sb Ⅲ,Bi Ⅲ) ion is introduced. The internal structures of and coordination environment of the transition metals and rare meta...The present status of the research on heteropolytungstates containing XW 9O 33 9- (X=As Ⅲ,Sb Ⅲ,Bi Ⅲ) ion is introduced. The internal structures of and coordination environment of the transition metals and rare metals within it are discussed.展开更多
Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powde...Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powder. The results sh ow that the decomposition temperature has remarkably effect on crystallite size, morphology, surface structure, IR behavior and activity of the powder for H2O2 decomposition. The major morphology of the particle is fluffy-sphered in the l ower temperature, which is consists of small sheets of crystallite. With the inc reasing of calcination temperature, crystal of CuO grows up, the fluffy-sphere d particle reduces and catalytic activity decreases. FT-IR patterns revealed t hat the absorption of Cu-O and -OH bond in CuO ultrafine powder were red-s hifted.展开更多
文摘Colorless crystal, [Ce(NO3)5H2O]· (C3N2H5) 2, has been obtained from the reaction of Ce(NO3) 3 with imdazole in the aqueous solution and its crystal structure has been determined by single crystal X-ray diffraction techniques. The crystal belongs to triclinic, space group P1. The cell parameters are: a = 0. 7489(l ) um, b = 0. 7914(2) nm, c = 1. 8139(3) nm, a = 89. 39(2)°, β = 89. 37(l） °,γ = 63. 18(2)°, Dc = 2. 1g. cm-3, Z = 2, R = 0. 0319. In the compound, all of five nitrates are bidentate and one molecule of water is monodentate, the coordination number of Ce (Ⅲ) is 11. The processes of thermal decomposition of the compound was proposed by its TG curve.
文摘The present status of the research on heteropolytungstates containing XW 9O 33 9- (X=As Ⅲ,Sb Ⅲ,Bi Ⅲ) ion is introduced. The internal structures of and coordination environment of the transition metals and rare metals within it are discussed.
文摘Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powder. The results sh ow that the decomposition temperature has remarkably effect on crystallite size, morphology, surface structure, IR behavior and activity of the powder for H2O2 decomposition. The major morphology of the particle is fluffy-sphered in the l ower temperature, which is consists of small sheets of crystallite. With the inc reasing of calcination temperature, crystal of CuO grows up, the fluffy-sphere d particle reduces and catalytic activity decreases. FT-IR patterns revealed t hat the absorption of Cu-O and -OH bond in CuO ultrafine powder were red-s hifted.
