Synthesis, spectral and structural studies of zinc(II) complexes of salicylaldehyde N4-phenylthiosemicarbazone

Five Zn(II) complexes of salicylaldehyde N(4)-phenylthiosemicarbazone (H(2)L) have been synthesized and physicochemically characterized. Out of the five Zn(II) complexes, one is binuclear {[(ZnL)(2)].3C(2)H(5)OH (1)} and the other four are mononuclear {[Zn(HL)(2)].C(2)H(5)OH (2), [ZnLbipy].1/2H(2)O...

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Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2008-03, Vol.69 (3), p.726-732
Main Authors: Seena, E B, Kurup, M R Prathapachandra
Format: Article
Language:English
Subjects:
Crystallography, X-Ray
Electrons
Hydrogen Bonding
Ligands
Magnetic Resonance Spectroscopy
Organometallic Compounds - chemical synthesis
Organometallic Compounds - chemistry
Spectrophotometry, Infrared
Thiosemicarbazones - chemical synthesis
Thiosemicarbazones - chemistry
Zinc - chemistry
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Summary:Five Zn(II) complexes of salicylaldehyde N(4)-phenylthiosemicarbazone (H(2)L) have been synthesized and physicochemically characterized. Out of the five Zn(II) complexes, one is binuclear {[(ZnL)(2)].3C(2)H(5)OH (1)} and the other four are mononuclear {[Zn(HL)(2)].C(2)H(5)OH (2), [ZnLbipy].1/2H(2)O (3), [ZnLphen].H(2)O (4) and [ZnLdmbipy] (5)} in nature. In complex 2, IR band due to nu(Zn-O) is absent and also the -OH signal due to the phenolic -OH group appears at delta=11.38ppm obtained from the (1)H NMR spectrum supports the existence of free -OH group. Complexes 3-5 are heterocyclic base adducts and their IR spectra display bands characteristic of coordinated heterocyclic bases. The molecular structure of one of the complex 3 is resolved by single crystal X-ray diffraction studies. The complex 3 is orthorhombic with a space group P2(1)cn. The Zn(II) in 3 is five coordinated and is having an approximately trigonal bipyramidal geometry with distortion from square based pyramid (TBDSBP).
ISSN:1386-1425