The title complex [ErY(Gly)_6(H_2O)_4](ClO_4)_6 5H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P1.The unit cell parameters ar...The title complex [ErY(Gly)_6(H_2O)_4](ClO_4)_6 5H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P1.The unit cell parameters are as follows:a=11.518(4),b=14.105(7),c=15.530(6) ,α=96.61(3), β=102.74(3),γ=105.70(3)°,V=2327.7(17) ~3,Z=2,Dc=2.091g/cm^3.The structure has been refined to a final R of 0.0785.The crystal is an infinite chain complex,in which four carboxyl groups from glycine molecules bridge the Er(Ⅲ)and Y(Ⅲ)ion,other two carboxyl groups bridge two adjacent Er(Ⅲ)or two Y(Ⅲ)ions.展开更多
The heat capacities of the two complexes, [La 2(Gly) 6(H 2O) 4]^(ClO 4) 6 and [Ho 2(Gly) 6(H 2O) 4](ClO 4) 6·2H 2O (Gly=glycine), were measured by adiabatic calorimetry in the temperature range from ...The heat capacities of the two complexes, [La 2(Gly) 6(H 2O) 4]^(ClO 4) 6 and [Ho 2(Gly) 6(H 2O) 4](ClO 4) 6·2H 2O (Gly=glycine), were measured by adiabatic calorimetry in the temperature range from 78 to 375 K. A solid solid phase transition was found between 322 87 and 342 29 K for [Ho 2(Gly) 6(H 2O) 4](ClO 4) 6·2H 2O, and the peak temperature, the enthalpy and the entropy of the transition were obtained to be 330 94 K, 11 65 kJ·mol -1 and 35 20 J·K -1 ·mol -1 , respectively. No indication of any phase transition or thermal anomaly was observed for [La 2(Gly) 6(H 2O) 4]^(ClO 4) 6. Thermal stabilities of the two complexes were investigated by thermogravimetry in the temperature range of 40—800 ℃. The possible mechanisms for the thermal decompositions were proposed according to the TG and DTG curves.展开更多
基金Project supported by the National Natural Science Foundation of China
文摘The title complex [ErY(Gly)_6(H_2O)_4](ClO_4)_6 5H_2O has been synthesized.Its crystal structure has been determined by X-ray diffraction method.The crystal is triclinic with space group P1.The unit cell parameters are as follows:a=11.518(4),b=14.105(7),c=15.530(6) ,α=96.61(3), β=102.74(3),γ=105.70(3)°,V=2327.7(17) ~3,Z=2,Dc=2.091g/cm^3.The structure has been refined to a final R of 0.0785.The crystal is an infinite chain complex,in which four carboxyl groups from glycine molecules bridge the Er(Ⅲ)and Y(Ⅲ)ion,other two carboxyl groups bridge two adjacent Er(Ⅲ)or two Y(Ⅲ)ions.
文摘The heat capacities of the two complexes, [La 2(Gly) 6(H 2O) 4]^(ClO 4) 6 and [Ho 2(Gly) 6(H 2O) 4](ClO 4) 6·2H 2O (Gly=glycine), were measured by adiabatic calorimetry in the temperature range from 78 to 375 K. A solid solid phase transition was found between 322 87 and 342 29 K for [Ho 2(Gly) 6(H 2O) 4](ClO 4) 6·2H 2O, and the peak temperature, the enthalpy and the entropy of the transition were obtained to be 330 94 K, 11 65 kJ·mol -1 and 35 20 J·K -1 ·mol -1 , respectively. No indication of any phase transition or thermal anomaly was observed for [La 2(Gly) 6(H 2O) 4]^(ClO 4) 6. Thermal stabilities of the two complexes were investigated by thermogravimetry in the temperature range of 40—800 ℃. The possible mechanisms for the thermal decompositions were proposed according to the TG and DTG curves.
