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Copper(II) complexes derived from di-2-pyridyl ketone-N(4)-phenyl-3-semicarbazone: Synthesis and spectral studies. 2010

T A Reena, and M R Prathapachandra Kurup
Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682 022, Kerala, India.

Five copper(II) complexes [CuLCl](2).CuCl(2).4H(2)O (1), [CuLOAc] (2), [CuLNO(3)](2) (3), [CuLN(3)] (4) and [CuLNCS].3/2H(2)O (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 77K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.

UI MeSH Term Description Entries
D007659 Ketones Organic compounds containing a carbonyl group Ketone
D003300 Copper A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55. Copper-63,Copper 63
D004578 Electron Spin Resonance Spectroscopy A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING. ENDOR,Electron Nuclear Double Resonance,Electron Paramagnetic Resonance,Paramagnetic Resonance,Electron Spin Resonance,Paramagnetic Resonance, Electron,Resonance, Electron Paramagnetic,Resonance, Electron Spin,Resonance, Paramagnetic
D012664 Semicarbazones A class of organic compounds that are derivatives of imines formed by condensation reactions between KETONES or ALDEHYDES and SEMICARBAZIDES. Semicarbazone
D013055 Spectrophotometry, Infrared Spectrophotometry in the infrared region, usually for the purpose of chemical analysis through measurement of absorption spectra associated with rotational and vibrational energy levels of molecules. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) IR Spectra,Infrared Spectrophotometry,IR Spectras,Spectra, IR
D015082 2,2'-Dipyridyl A reagent used for the determination of iron. 2,2-Bipyridine,Bipyridyl,alpha,alpha-Dipyridyl,2,2 Dipyridyl,2,2' Dipyridyl,2,2'-Bipyridine,2,2-Bipyridyl,2,2-Dipyridyl,2,2 Bipyridine,2,2 Bipyridyl,2,2' Bipyridine,Dipyridyl, 2,2,Dipyridyl, 2,2',alpha,alpha Dipyridyl
D056831 Coordination Complexes Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged. Metal Complexes,Complexes, Coordination,Complexes, Metal

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