Synthesis, spectroscopic, magnetic and thermal properties of bimetallic salts, [Ni(L)][MCl4] [where M=Co(II), Zn(II), Hg(II) and L=3,7-bis(2-aminoethyl)-1,3,5,7-tetraazabicyclo(3.3.1)nonane]. X-ray structure of [Ni(L)][CoCl4].

Abstract New bimetallic complex salts corresponding to the formulation [Ni(L)][MCl 4 ] have been synthesized by the facile reaction between [Ni(L)](ClO 4 ) 2 and [MCl 2 (PPh 3 ) 2 ] in high yields {where M = Co(II), Zn(II), Hg(II) and L = 3,7-bis(2-aminoethyl)-1,3,5,7-tetraazabicyclo(3.3.1)nonane}. The complexes were characterized by IR, electronic spectra, TGA/DSC, magnetic moment and conductivity measurements. The X-ray crystal structure for [Ni(L)][CoCl 4 ] clearly establishes the cationic–anionic interaction. It crystallizes in the space group P 1 with unit cell dimensions a  = 7.1740(15) A, b  = 8.1583(16) A and c  = 8.3102(16) A. A square-planar geometry is evident for the [Ni(L)] 2+ cation while the anion is found to be tetrahedral. A two-step thermolytic pattern is observed in the pyrolysis of the bimetallic complex salts.