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Non‐isothermal Kinetics of the First‐stage Decomposition Reaction of the Complex of Terbium p ‐Methylbenzoate with 1,10‐Phenanthroline
Author(s) -
JianJun Zhang,
RuiFen Wang,
HongMei Liu,
JiBiao Li,
Ning Ren,
ZhiHua Gao
Publication year - 2005
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.200590646
Subject(s) - chemistry , activation energy , entropy of activation , thermal decomposition , phenanthroline , terbium , kinetics , gibbs free energy , enthalpy , decomposition , kinetic energy , isothermal process , medicinal chemistry , thermodynamics , stereochemistry , reaction rate constant , inorganic chemistry , organic chemistry , physics , quantum mechanics , ion
The thermal behavior of Tb 2 (p‐MBA) 6 (phen) 2 ( p ‐MBA= p ‐methylbenzoate; phen=1,10‐phenanthroline) in a static air atmosphere was investigated by TG‐DTG, SEM and IR techniques. The thermal decomposition of the Tb 2 ( p ‐MBA) 6 (phen) 2 occurred in three consecutive stages at T P of 354, 457 and 595 °C. By Malek method, RO (n<1) was defined as kinetic model for the first‐step thermal decomposition. The activation energy ( E ) of this step is 170.21 kJ·mol ‐1 , the enthalpy of activation (Δ H ≠ ) 164.98 kJ·mol ‐1 , the Gibbs free energy of activation (Δ G ≠ ) 145.04 kJ·mol ‐1 , the entropy of activation (Δ S ≠ ) 31.77 J·mol ‐1 ·K ‐1 , and the pre‐exponential factor ( A ) 10 15.21 s ‐1 .