Preparation, crystal structure and thermal analyses of a nitrogen-rich coordination compound [Co(DAT)₆](PA)₂·4H ₂O

A new coordination compound [Co(DAT)₆](PA)₂· 4H₂O has been prepared by using 1,5-diaminotetrazole (DAT) as ligands and picrate (PA) as acidic anions, and structurally characterized by X-ray single crystal diffraction, elemental analysis and FT-IR spectroscopy. The cobalt(II) cation coordinates with six N atoms from six bulky DAT molecules to form a six-coordinated and slightly distorted octahedral configuration. The coordination cation is situated between two PA anions whose benzene-ring planes are parallel to each other. The coordination cation and the PA anions are bonded together by electrostatic forces in the molecular unit of [Co(DAT) ₆](PA)₂·4H₂O. All the molecular units are linked together by the intermolecular hydrogen bonds to form the crystal structure, in the formation of which DAT ligand plays an important role. Thermal decomposition processes of [Co(DAT)₆](PA)₂·4H ₂O were investigated by using DSC, TG-DTG and FT-IR analyses. The kinetic parameters of the first exothermic process of the title compound were studied by applying the Kissinger's and Ozawa-Doyle's methods.