SYNTHESIS AND CHARACTERISATION OF MANGANESE(II) COMPLEXES WITH SEMICARBAZIDE AND THIOSEMICARBAZIDE BASED LIGANDSAbstract
Mn(II) complexes with four semicarbazide and thiosemicarbazide based ligands such as 2-formyl pyridine semicarbazone (L1), 2-formyl pyridine thiosemicarbazone (L2), 5-methyl 2-formyl pyridine semicarbazone (L3) and 5-methyl 2-formyl pyridine thiosemicarbazone (L4) have been synthesized and characterized. All the ligands were characterized by elemental analyses, IR, 1HNMR and mass spectral studies. The complexes were characterized by using various physicochemical techniques such as elemental analysis, molar conductance, magnetic susceptibility measurements and spectral studies such as IR, UV-visible and EPR. The complexes were found to have general compositions Mn(L)2X2 [where L = L1, L2, L3 & L4, X = Cl–, NO3–]. The molar conductance data of chloro and nitrato complexes of L1, L2, L3 and L4 suggest nonelectrolytic nature of the complexes. Therefore they may be formulated as [Mn(L)2X2].Complexes show magnetic moment corresponding to five unpaired electrons. On the basis of IR electronic and EPR spectral data distorted octahedral geometry of complexes has been suggested.
Department of Education in Science and Mathematics, National Council of Education Research and Training, New Delhi, India.
22 August, 2016
21 October, 2016
17 November, 2016
01 March, 2017