No abstract

Manganese(I1) complexes of terdentate N,N,O donor Schiff bases (HL) are described. The ligands Hpabh, Hpamh and Hpadh are obtained by condensing 2-pyridine-carboxaldehyde with benzhydrazide, 4-methoxybenzhydrazide and 4-dimethylaminobenzhydrazide, respectively. The reaction of HL with manganese@) acetate tetrahydrate affords [MnL2J. The crystal structure determination of [Mn(pabh)z] was performed. T$e complex crystallises in the spaceo roup PZ,/n with a=9.836(3), b=23.994(7), c = 10.222(3)A, p= 104.14(3)", V=2339.5(13)A and Z = 4 . In the distorted octahedral MnN402 coordination sphere each ligand acts as a meridional N,N,O donor utilising pyridine-N, imine-N and amide-0 atoms. Electronic spectra of the complexes display charge transfer bands in the range 404-298 nm. Room temperature solid state magnetic moments (5.88-6.12~~) of the complexes are consistent with a high-spin dS system. EPR spectra of the complexes suggest a similar distorted octahedral N4O2 coordination sphere around Mn(I1) in each complex.9