作者:D. Das、N. Ray Chaudhuri
DOI:10.1023/a:1010194119452
日期:——
[NiL3]X-2 (where L=N-phenylethane-1,2-diamine and X=I- and ClO4-), [NiL2X2] (X is Cl-, Br-, NCS-, 0.5SO(4)(2)- or 0.5SeO(4)(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 degrees C, Delta H=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]I-2 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 0.5SO(4)(2)- or 0.5SeO(4)(2)-) are having cis-octahedral configuration. Amongst the complexes, only NiLCl2 shows unusually high (5.1 BM at 27 degrees C) magnetic susceptibility value.