Synthesis and Spectral Studies on Transition Metal Complexes of Some Aroyl Hydrazone Ligands
Pramod Kumar Singh1, Kamalika Banerjee2, Sangeeta Singla3

1Dr. Pramod Kumar Singh, Associate Professor, Department of Chemistry, Kirori Mal College, University of Delhi, Delhi-110007, India.
2Dr. Kamalika Banerjee, Associate Professor, School of Sciences, Chemistry, IGNOU, Maidan Garhi, Delhi-110068,India.
3Sangeeta Singla, Associate Professor, Department of applied Science and Humanities, Dronacharya College of Engineering, Gurgaon-122001, Haryana, India.
Manuscript received on December 01, 2015. | Revised Version Manuscript Received on December 23, 2015. | Manuscript published on December 20, 2015. | PP: 5-9 | Volume-1 Issue-2, December 2014.
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Abstract: Two new aroyl hydrazones, N-2- hydroxybenzaldehyde-isonicotinoylhydrazones (HBIH=H2L 1 ) and N-2-hydroxy-4-methylbenzaldehyde-isonicotinoyl hydrazone (HMIH= H2L 2 ) and its Co (II), Ni (II), and Cu (II) complexes have been prepared. The ligands are characterized by elemental analysis, infrared, electronic and NMR spectral studies, while the structure of complexes has been investigated by using elemental analysis, magnetic susceptibility, molar conductance, thermal and spectral (IR, UV, EPR) measurements. IR and NMR spectra indicate that the ligand behave as dibasic tridentate ligand and coordinates to the metal ion through ketonic oxygen, azomethine nitrogen, and phenolic oxygen atoms by double deprotonation of ligand, both the phenolic and enolic protons. The magnetic and spectral data indicate octahedral geometry for Co (II) and Ni (II) complexes while the square planer geometry for Cu (II) complex.
Keywords: Aroyl hydrazones, isonicotinoyl hydrazone, ketonic
oxygen, metal complexes.