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用DSC和TG研究了(n-C_nH_(2n+1)NH_3)_2CuCl_4(n=7-12)(记为C_nM)配合物的热稳定性和固-固相变。由红外光谱讨论了C_9Cu三个相的性质。发现C_nM的热稳定性呈奇偶效应;主相变峰温随链长增长而升高;相变总ΔH和ΔS也随链增长而加大;当n≤9时,高温相为部分无序相;而n≤10时,高温相为构象无序相。C_9Cu的主相变主要源自链间堆积结构变化。而在307.7K的相变主要与烃链有序-无序变化有关。
The thermal stability and solid-solid phase transition of (n-C_nH 2n + 1) NH 3) _2CuCl_4 (n = 7-12) (denoted as C_nM) were investigated by DSC and TG. The properties of C_9Cu three phases are discussed by infrared spectroscopy. It was found that the thermal stability of C_nM was odd-even; the peak temperature of main phase transition increased with the increase of chain length; the total ΔH and ΔS of phase transition also increased with the chain growth; when n≤9, the high temperature phase was partially disordered phase; When n≤10, the high temperature phase is the conformational disordered phase. The main phase transition of C_9Cu is mainly due to the change of packing structure between chains. The phase transition at 307.7 K is mainly related to the orderly-disorderly change of hydrocarbon chains.