Thermal Studies of N-phenylethane-1,2-diamine Complexes of Nickel(II) in the Solid State |
| |
| Authors: | Das D. Chaudhuri N. Ray |
| |
| Affiliation: | (1) Department of Inorganic Chemistry, Indian Association for the Cultivation of Science Calcutta, 700 032, India |
| |
| Abstract: | [NiL3]X2 (where L=N-phenylethane-1,2-diamine and X=I− and ClO4 −), [NiL2X2] (X is Cl−, Br−, NCS−, 0.5SO4 2− or 0.5SeO4 2−) and [NiL2(H2O)2](NO3)2 have been synthesized from solution and their thermal study has been carried out in the solid phase. [NiL2Cl2] upon heating undergoes irreversible endothermic phase transition (142–152°C, ΔH=0.35 kJ mol−1) without showing any visual colour change. This phase transition is assumed to be due to conformation changes of the diamine chelate rings. NiLCl2 and NiL2.5I2 have been prepared pyrolytically from [NiL2Cl2] and [NiL3]I2 respectively in the solid state. [NiL2(H2O)2](NO3)2 upon heating undergoes deaquation-anation reaction without showing any visual colour change. [NiL2X2] (X is Cl−, Br−, NCS−), [NiL2(H2O)2](NO3)2 and [NiL2(NO3)2] possess trans-octahedral configuration, whereas, [NiL2X2] (X is 0.5SO4 2− or 0.5SeO4 2−) are having cis-octahedral configuration. Amongst the complexes, only NiLCl2 shows unusually high (5.1 BM at 27°C) magnetic susceptibility value. This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
| Keywords: | nickel(II) diamine complexes N-phenylethane-1,2-diamine phase transition |
| 本文献已被 SpringerLink 等数据库收录！ |
|
