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(5) of di-2-pyridyl ketone-N 4 -phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77 K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.

A new semicarbazone, HL has been synthesized from quinoline-2-carboxaldehyde and N 4-phenyl-3semicarbazide and structurally and spectrochemically characterized. 1 H NMR, 13 C NMR, IR and electronic spectra of the compound are studied. The existence of keto form in the solid state is supported by the crystal structure and IR data. The compound crystallizes into an orthorhombic space group P2 1 2 1 2 1. Intra and intermolecular hydrogen bonding interactions facilitates unit cell packing in the crystal lattice.