Low-temperature heat capacity and thermal decomposition of crystalline [Er-2(His center dot H+)(H2O)8](ClO4)(6)center dot 4H(2)O

摘要

The heat capacities of rare earth complex with amino acid histidine, [Er-2(His.H+)(H2O)(8)](ClO4)(6).4H(2)O, were measured with an automatic adiabatic calorimeter from 79 to 320 K. It was found that there was a sudden increment in heat capacity within the temperature range 182-190 K. Thermal decomposition behavior of the complex in nitrogen atmosphere was studied by thermogravimetric (TG) analysis, and a possible decomposition mechanism was suggested according to TG-DTG results. (C) 2003 Elsevier B.V. All rights reserved.