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在280-500K温度范围内用自动绝热量热计测量了(n-C_(12)H_(25)NH_3)_2CdCl_4的热容。在所研究的温度范围内发现一个固-固相转变,其相变温度,相变焓和相变熵分别为(332.4±0.1)K,(48.35±0.33)kJ·mol~(-1)和(145.5±1.0)J·K~(-1)·mol~(-1)。结合已发表的(n=C_(12)H_(25)NH_3)_2MCl_4(M=Mn,Zn)的相交参数讨论了此类配合物的中心原子对其相变的影响。[MCl_4]~(2-)配位方式的不同被认为是该类配合物的相变热参数产生差异的主要原因。
The heat capacity of (n-C_ (12) H_ (25) NH_3) _2CdCl_4 was measured with an automatic adiabatic calorimeter in the temperature range of 280-500K. A solid-solid phase transition was found in the investigated temperature range. The phase transition temperature, phase transition enthalpy and phase entropy were (332.4 ± 0.1) K, (48.35 ± 0.33) kJ · mol -1 and (145.5 ± 1.0) J · K ~ (-1) · mol ~ (-1). The influence of the central atoms of these complexes on their phase transitions is discussed in the light of the interdependent parameters (n = C_ (12) H_ (25) NH_3) _2MCl_4 (M = Mn, Zn) The difference of [MCl_4] ~ (2-) coordination mode is considered as the main reason for the difference of phase transition thermal parameters of these complexes.