Synthesis, spectral and structural studies of zinc(II) complexes of salicylaldehyde N4-phenylthiosemicarbazone |
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Authors: | Seena E B Kurup M R Prathapachandra |
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Institution: | Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682022, Kerala, India. |
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Abstract: | 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). |
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