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Preparation and study of thermal decomposition mechanism of Zn(Thr)(AcO) 2 ·2H 2 O
Author(s) -
Jiao BaoJuan,
Zhao FengQi,
Meng XiangXin,
Hu RongZu,
Gao ShengLi
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040221010
Subject(s) - chemistry , thermal decomposition , decomposition , activation energy , dehydration , kinetics , enthalpy , isothermal process , nucleation , thermal analysis , thermodynamics , organic chemistry , thermal , biochemistry , physics , quantum mechanics
The complex of Zn(AcO) 2 ·2H 2 O and threonine was prepared in the mixture solvent of water‐acetone, the composition of which was identified as Zn(Thr)(AcO) 2 ·2H 2 O by chemical and elemental analyses. The complex was investigated by XRD, JR, TG‐DTG and DSC methods. The result of TG‐DTG shows that the thermal decomposition processes of the complex can be divided into three stages, which were dehydration (I), partial decomposition (II) and complete decomposition into ZnO (III). Dehydration enthalpy was 126.89 kj·mol −1 , decomposition enthalpy of the stage (II) was 79.50 kJ·mol −1 . The study of non‐isothermal kinetics shows that the mechanism of the dehydration stage was Maple Power of n =3/2, the apparent activation energy E was 145.32 kJ·mol −1 and the pre‐exponential factor A was 1.4125×10 17 s −1 , and that of ligand‐losting process was nucleation and growth mechanism (Avrami‐Erofeev equation n =1/2), its E was 189.33 kJ·mol −1 , and A was 3.4674×s −1 . The empirical kinetics model equations of the investigated processes were proposed.