Syntheses, structural diversity and thermal behavior of first row transition metal complexes containing potential multidentate ligands based on 2,6-diacetylpyridine and benzyl carbazate

The Schiff base ligand, N’-(1-{6-[1-(Benzyloxycarbonyl-hydrazono)-ethyl]-pyridin-2-yl}-ethylidene)-hydrazinecarboxylic acid benzyl ester ( bc 2 -dap ), was synthesized by the reaction of 2,6-diacetylpyridine (dap) with benzyl carbazate (bc) in methanol. Also first row transition metal complexes of the general formula [M(NCS) 2 (bc 2 -dap)].nH 2 O; M = Mn ( 1 ), Fe ( 2 ), Co ( 3 ), Zn ( 4 ) or Co ( 5 ); n=0 ( 1-4 ) and n=1 ( 5 ), [Fe(bc 2 -dap)(H 2 O) 2 ].2Cl.4H 2 O ( 6 ), [Ni(NCS) 2 (bc 2 -dap)].CH 3 OH ( 7 ) and [Co(NCS) 2 (bc-dap)] ( 8 ) have been synthesized using a template method and characterized by spectroscopic techniques and single crystal X-ray diffraction. Complexes