Syntheses, EPR spectral studies and crystal structures of manganese(II) complexes of neutral N,N donor bidentate Schiff bases and azide/thiocyanate as coligand

Four manganese(II) complexes Mn2(paa)2(N3)4 (1), [Mn(paa)2(NCS)2]·3/2H2O (2), Mn(papea)2(NCS)2 (3), [Mn(dpka)2(NCS)2]·1/2H2O (4) of three neutral N,N donor bidentate Schiff bases were synthesized and physico-chemically characterized by means of partial elemental analyses, electronic, infrared and EPR spectral studies. Compounds 3 and 4 were obtained as single crystals suitable for X-ray diffraction. Compound 4 recrystallized as Mn(dpka)2(NCS)2. Both the compounds crystallized in the monoclinic space groups P21 for 3 and C2/c for 4. Manganese(II) is found to be in a distorted octahedral geometry in both the monomeric complexes with thiocyanate anion as a terminal ligand coordinating through the nitrogen atom. EPR spectra in DMF solutions at 77 K show hyperfine sextets with low intensity forbidden lines lying between each of the two main hyperfine lines and the zero field splitting parameters (D and E) were calculated.

Four manganese(II) complexes of three neutral N,N donor bidentate Schiff bases were synthesized and physico-chemically characterized. Two complexes were obtained as single crystals suitable for X-ray diffraction and their structures were determined by X-ray diffraction studies. Manganese(II) is found to be in a distorted octahedral geometry in both the complexes. EPR spectra in DMF solutions at 77 K show hyperfine sextets with forbidden lines and its D and E parameters were calculated.Figure optionsDownload as PowerPoint slide