Coordination Polymers based on Terephthaloyl bis(isonicotinoylhydrazone): Synthesis, Structural Characterization and Thermal Analysis

Abstract

Abstract A new terephthaloyl bis(isonicotinoylhydrazone) (TPBI) bis-ligand has been synthesized by reacting isoniazid with terephthaloyl chloride. The chelating bis-ligand has been characterized using elemental analyses, ESI mass spectra, FTIR, 1H and 13C NMR spectroscopic techniques. The new Cu(II) and Zn(II) coordination polymers were prepared from terephthaloyl bis(isonicotinoylhydrazone) (TPBI) bis-ligand and characterized using elemental analyses, FTIR, UV-Visible spectra, magnetic moment values, XRD, SEM and thermogravimetric analyses. The results indicated formation of 1:2 metal chelates. The FTIR spectral data suggest that the synthesized TPBI ligand is an octadentate chelating ligand. On account of the analytical data, Cu(II) polychelate has an octahedral geometry whereas Zn(II) polychelate has tetrahedral geometry. The thermal degradation behaviour of the synthesized bis-ligand and the coordination polymers has been investigated by applying TG/DTA techniques.