Structural and spectral studies of nickel(II) complexes with N(4),N(4)-(butane-1,4-diyl) thiosemicarbazones

Nickel(II) complexes of quinoline-2-carbaldehyde N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL1) and 2-benzoylpyridine N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL2) have been synthesized and physico-chemically characterized by means of partial elemental analyses, molar conductance measurements, magnetic measurements, electronic and infrared spectral studies. Three complexes were given the formulae [Ni(HL1)2]Cl2 (1), [Ni(HL2)L2]ClO4 · 7H2O (2) and [NiL2Cl] · 0.5H2O (3). The structure of compound 1 has been solved by single crystal X-ray crystallography and is found to be distorted octahedral. Compound 2, when crystallized in DMSO solution, got deprotonated to form a new compound [Ni(L2)2] (2a), with a distorted octahedral Ni(II) center. In compound 1, HL1 coordinates to the metal in the thione form, while in compounds 2a and 3, HL2 coordinates in its deprotonated thiolate form.

Graphical abstractNickel(II) complexes of quinoline-2-carbaldehyde N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL1) and 2-benzoylpyridine N(4),N(4)-(butane-1,4-diyl) thiosemicarbazone (HL2) were synthesized and physico-chemically characterized by means of partial elemental analyses, molar conductance measurements, magnetic measurements, electronic and infrared spectral studies. Three complexes were given the formulae [Ni(HL1)2]Cl2 (1), [Ni(HL2)L2]ClO4 · 7H2O (2) and [NiL2Cl] · 0.5H2O (3). The structure of compound 1 has been solved by single crystal X-ray crystallography and is found to be distorted octahedral. Compound 2, when crystallized in DMSO solution, got deprotonated to form a new compound [Ni(L2)2] (2a), with a distorted octahedral Ni(II) center. In compound 1, HL1 coordinates to the metal in the thione form, while in compounds 2a and 3, HL2 coordinates in its deprotonated thiolate form.Figure optionsDownload full-size imageDownload as PowerPoint slide