Molecules in metal isonicotinate tetrahydrates, M(NC 5 H 4-p-CO 2) 2 .4H 2 O with M = Mn, Fe, Co, Ni, Cu, Zn, consisting of the hexacoordinate complexes trans-[M(NC 5 H 4-p-CO 2) 2 (OH 2) 4 ], participate in exhaustive hydrogen-bond formation among themselves to lead to a robust 3D supramolecular network in the solid state. Solid-state diffuse reflectance UV-Vis-NIR spectra of the complexes have been assigned to ligand field and charge transfer transitions. Sharp weight loss due to dehydration, as shown by TGA of Cu(NC 5 H 4-p-CO 2) 2 .4H 2 O, suggests the suitability of this complex for the gravimetric estimation of copper.

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