Transition metal complexes of 12- membered tetraaza [N4]and 15- membered triazadithia[N3S2]macrocyclic ligands: Synthetic and spectroscopic aspects.

Abstract

The macrocyclic ligands, 2,3,5,8,9,11hexamethyl-1,4,7,10-tetraazacyclododeca-1,3,7,9 tetraene (DADAP) and (4,5:10,11) Dibenzo(e,k)-2,13-dimethyl-3,12-diaza-6,9-dithiobicyclo(13,3,1)octadecenel- (18),2,12,14,16-pentaene (DBMAS) were synthesized and used to react with transition metal ions to synthesized the complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Pd(II). which were characterized by using elemental analysis, molar conductance, magnetic susceptibility measurements, i.r., electronic, and e.p.r. spectral studies. Spectral analyses propose octahedral stereochemical environment around Cr(III), Mn(II) and Co(II),  square-planar for Ni(II) and Pd(II), and tetragonal stereochemical environment around Cu(II) with DADAP. Whereas the complexes of DBMAS ligand have a six-coordinate octahedral structures and are of a high spin kind.