Chemical Science International Journal

New Properties and Characteristics of Mixed Ligand Coordination Polymers Derived from Transition Metal Ions, 1,2,4,5-Benzenetetracarboxylate and Aromatic Diamines

Aref A. M. Aly *

Department of Chemistry, Faculty of Science, Assiut University, Egypt

Asma I. El-Said

Department of Chemistry, Faculty of Science, Assiut University, Egypt

R. Gabr

Department of Chemistry, Faculty of Science, Assiut University, Egypt

Rasel. A. Mukred

Department of Chemistry, Faculty of Education, Al-Baida University, Yemen

*Author to whom correspondence should be addressed.

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Abstract

Coordination polymers derived from 1,2,4,5-benzenetetracarboxylate (H₂btec^2- or btec^4- ), Fe(II), Mn(II), Co(II), Ni(II), Cu(II), Cd(II) or UO₂(II) metal ions, 1,10-phenanthroline(1,10-phen) or 2,2^'-bipyridine(2,2^'-bipy)  were prepared. The polymers were characterized by elemental analysis, IR and electronic spectra, electrical conductance, magnetic susceptibility measurements and thermal behavior. The electronic spectra, magnetic susceptibility measurements and X-ray structure determination revealed octahedral and tetrahedral geometries around the metal ions. Kinetic and thermodynamic parameters of the thermal decomposition were computed from the thermal data using the Coats-Redfern equation. From the X-ray powder diffraction the particle sizes (6.4-25.4 nm) of the coordination polymers could be calculated using the Scherrer^`s equation.

 

Keywords: Coordination polymers, spectra, thermal analysis

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