Synthesis, Crystal Structure and Nonisothermal Kinetics of Complex Co(tda)(5-mphen)(H2O)

Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (3): 383-387.

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Synthesis, Crystal Structure and Nonisothermal Kinetics of Complex Co(tda)(5-mphen)(H₂O)

HOU Xiang-yang^1,2, CHEN San-ping¹ and GAO Sheng-li¹*

1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi’an 710069, P. R. China;
2. Department of Chemistry, Yan’an University, Yan’an 716000, P. R. China

Received:2008-03-07 Revised:2008-04-08 Online:2009-05-25 Published:2009-08-07
Contact: GAO Sheng-li, E-mail: gaoshli@nwu.edu.cn
Supported by:
Supported by the National Natrual Science Foundation of China(No.20771089).

Abstract

Abstract:

The title complex, formulated as Co(tda)(5-mphen)(H₂O)(H₂tda=thiodiglycolic acid, 5-mphen= 5-methyl-1,10-phenanthroline), was synthesized and characterized by elemental analysis, IR spectroscopy, X-ray single crystal diffraction, and TG-DTG techniques. The complex crystallized in monoclinic space group C2/c, with parameters of a=1.8142(2) nm, b=0.78251(9) nm, c=2.4624(3) nm, β=93.809(2)°, V=3.4880(7) nm³, Z=8, D_c=1.579 g/cm³, the final R indices [I>2σ(I)] are R₁=0.0469, wR₂=0.1021, R indices for all data are R₁=0.0835, wR₂=0.1169. The central Co²⁺ cation is coordinated in a distorted octahedral geometry with the ligand tda, 5-mphen, and water molecule. The coordination complex possesses a three-dimensional framework by means of hydrogen bonds and π-π stacking interactions. According to TG-DTG curves, the possible thermal decomposition mechanisms, the possible kinetic parameters, and equation of dehydration stage of the complex are obtained, that is, E_a=110.98 kJ/mol, lg(A/s^–1)=8.554, dα/dT = 10^8.5546/β·3(1–α)[–ln(1–α)]^2/3·exp(–13349/T), respectively.

Key words: Co(tda)(5-mphen)(H₂O); Crystal structure; Kinetics of thermal decomposition

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Synthesis, Crystal Structure and Nonisothermal Kinetics of Complex Co(tda)(5-mphen)(H₂O)

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