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Semicarbazone copper(II) complexes 135 spectral studies on copper(II) isatin, benzoin and Summary The preparation and spectral properties of five copper(II) complexes of semicarbazones, derived from 2-hydroxynaphthaldehyde (NPSCZ), benzoin (BZSCZ) and isatin (ISSCZ) are described. I.r., electronic, e.s.r. 1H and 13C n.m.r, spectra show that the semicarbazone's coordination is distorted trigonal bipyramidal for [Cu(BZSCZ-2H)(H20)], distorted tetragonal pyramidal for [Cu(NPSCZ)2](CIO4) 2 and dimeric for the other three complexes.

CU II complexes of 1-salicoyl-4-phenylthiosemicarbazide (SPT) have been synthesized and characterized by means of elemental analysis, magnetic measurements, and i.r. and e.p.r, spectroscopic methods; 1H-and 13C-n.m.r. and mass spectral data on the thiosemicarbazide are also reported. A paramagnetic complex #elf= 1.298B.M., is formed with copper(II) sulphate; the low magnetic moment and the e.p.r, spectral data suggest a binuclear species. A diamagnetic complex due to a strong Cu-Cu interaction has been isolated with copper(II) chloride.

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