Syntheses, crystal structures and magnetic studies of new manganese(II) coordination polymers with ditopic N pyridinylisonicotinohydrazide ligand and dicyanamide
Abstract Two new coordination polymers of Mn(II) with dicyanamide anion (dca) and isonicotinohydrazone based ligands, [Mn2(L1)2(dca)2(CH3OH)2]*H2O}n (1) and [Mn2(L2)2(m dca)2]n (2) were synthesized and characterized by elemental analyses and spectroscopic methods where HL1 (E) N' (phenyl(pyridin 2 yl)methylene)isonicotinohydrazide and HL2 (E) N' (1 (pyridin 2 yl)ethylidene)isonicotinohydrazide. The IR spectra of 1 and 2 show the characteristic stretching vibration bands of a dicyanamide ligand as three bands. Structures of the compounds were characterized by X ray diffraction analysis which indicates that the isonicotinohydrazone ligands act as a ditopic ligand and coordinate to manganese ions via the N2O donor set and pyridine group of the isonicotine part. The magnetic susceptibility measurements studies indicated the presence of an antiferromagnetic coupling between high spin Mn(II) ions. Antiferromagnetic coupling for 2 is stronger than that of 1 which is due to connection of Mn(II) ions through dicyanamide bridges in the former.