Physicochemecal studies of some hexamethylenetetramine metal(II) complexes

Abstract

Divalent metal (Mn, Co, Ni) complexes of the ligand hexamethylenetetramine (HMTA, C6H12N4) with sulfate, nitrate and fluoroborate as counter ions have been synthesized in ethanolic media. Whereas the complexes with BF4- and NO3- as counter ions have two molecules of hexamethylenetetramine, those with SO42- as counter ion contain just one molecule of hexamethylenetetramine. The complexes have been characterized by elemental analyses, infrared and visible spectroscopy and room temperature magnetic susceptibility measurements. The results suggest octahedral coordination in which the central metal ion is bonded to hexamethylenetetramine and water molecules.