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Structural Characterization of Some New Coordination Compounds of Tin(II) with Schiff Bases of Sulpha Drugs

Maheshwari R., Sharma S., Bedi M., Varshney A.K.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 7

1361-1365

EN

Some new coordination compounds of tin(II) have been synthesized by the reaction of tin(II) methoxide with the Schiff bases prepared by condensation of aldehyde/ketones with sulpha drugs. These complexes have been characterized on the basis of elemental analysis, ultraviolet, infrared, 1H NMR and 119Sn NMR spectral studies. The analytical data of complexes indicate 1:2 metal ligand stoichiometry of the type of [ML2], where M = Sn(II). The ligands be haved as bidentate chelating agents and bonded to the metal ion through imines nitrogen and ox ygen atom of either moiety of ligand. The antibacterial activities of the ligands and their tin(II) coordination compounds have been screened in vitro against the o ga ism Escherichia coli, Staphylococus aureus, Prouteus mirabilis,and Bacillus thurengiensis.

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Synthesis and spectroscopic characterization of new tin(II) complexes containing nitrogen and oxygen donor ligands

Singh H. L., Gupta M. K., Varshney S., Varshney A. K.

Bulletin of the Polish Academy of Sciences. Chemistry

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2003

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Vol. 51, No. 1

5-14

EN

Some new tin(II) complexes have been synthesized by the reactions of tin(II) methoxide with nitrogen donor ligands. The ligands used in these studies are condensation products of heterocyclic aldehydes/ketones and sulpha drugs. Their structures have been confirmed on the basis of elemental analyses, ultraviolet, infrared and multinuclear magnetic resonance (1H, (13)C and (119)Sn) spectral studies. The bivalent nature and their square pyramidal geometry around tin(II) have been deduced on the basis of 119Sn Mossbauer spectral data. Monomeric and non-electrolytic nature of these complexes have been confirmed by molecular weight determinations and conductance measurements.

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Synthesis and spectroscopic studies of tin(IV) complexes of biologically active Schiff bases of sulpha drugs and heterocyclic aldehydes/ketones

Gupta M. K., Singh H. L., Tripaathi U. D., Varshney A. K.

Bulletin of the Polish Academy of Sciences. Chemistry

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2000

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Vol. 48, No. 3

195-201

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Synthesis and characterization of some new tin(IV) complexes with macrocyclic schiff bases

Singh H. L., Varshney A. K.

Bulletin of the Polish Academy of Sciences. Chemistry

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2000

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Vol. 48, No. 2

125-130

EN

Some new tin (IV) complexes with macrocyclic Schiff bases, viz. 1,5,9,13-tetraaza-2,10-dimethyl-4,12-diphenyl cyclohexadeca-l,4,9,12-tetraene (L1) and 1,4,8,12-tetraaza-6,9,13,14-dibenzocyclotetradeca-l,4,8,11-tetraene (L2 ) have been synthesized. An attempt has been made to probe their structures on the basis of elemental analyses, molec-ular weight determination, electronic, infrared, 1H NMR and (119)Sn NMR spectroscopy. Molar conductance has shown the non-electrolytic behaviour of the tetravalent metal complexes that appear to be 1 : 1 electrolytes. Six-coordinate structure has been proposed for all tin complexes.

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Coordination behaviour of nitrogen and oxygen donor ligands towards stannic ion

Singh H. L., Varshney S., Varshney A. K.

Bulletin of the Polish Academy of Sciences. Chemistry

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1999

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Vol. 47, No. 3

209-216

EN

Synthesis and characterization of some new coordination compounds of organotin(IV) with nitrogen and oxygen donor ligands have been described. These have been obtained by the reactions of dibutyltinoxide with monobasic bidentate ligands derived by the condensation of 2-acetylfuran or 2-acetylthiophene with glycine, .8-alanine, valine, leucine and tryptophan in 1 :2 stoichiometry. Suitable structures based on IR, multinuclear magnetic resonance (1H, 13C and 119Sn) spectral studies have been indicated for these new derivatives.

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Coordination behaviour of biologically active Shiff bases of amino acids towards stannous ion

Singh H. L., Sharma M., Gupta M. K., Varshney A. K.

Bulletin of the Polish Academy of Sciences. Chemistry

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1999

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Vol. 47, No. 2

103-110

EN

Reaction of tin (II) methoxide with Schiff bases derived by condensation of 2-hydroxy-1-naphthaldehyde, salicylaldehyde with glycine, b-alanine, a-valine, a-iso-leucine and a-tryptophan in 1:1 molar ratio gives a new series of tin(II) complexes. The complexes are monomeric and of non-electrolytic nature. The coordination behaviour of Schiff bases through phenolic and acidic oxygens and azomethine nitrogen towards tin atom has been investigated by infrared and multinuclear magnetic resonance (1 H, 130 and 119Sn) spectral studies. Schiff bases and their tin complexes have also been screened for their antifungal and antibacterial activities as several fungi and bacteria are found quite active in this respect.