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Synthesis, Characterization and Antifungal Activity of Mono-Oxovanadium(V) Complexes of 4-Phenylphenol

Sharma N., Thakur M., Sagar A., Chaudhry S. C.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 11

1859-1870

EN

New mono-oxovanadium(V) complexes of composition VOCl3-n(OC6H4-C6H5-4)n (where n = 1 to 3) have been synthesized in quantitative yields by the in-situ reaction of VOCl3 with trimethylsilyl derivative of 4-phenylphenol and characterized by elemental analyses, molar conductance measurements and IR, 1H NMR and mass spectral methods. The reactions of complexes with a variety of nitrogenous bases viz. imidazole and benzimidazole (L); 2,2'-bipyridyl and 1,10-phenanthroline (B) yielded adducts of composition VOCl3-n(OC6H4-C6H5-4)n×2L and VOCl3-n(OC6H4-C6H5-4)n×B, proved by analytical and IR spectral data. The molecular model calculations through optimum energy minimization for the perspective geometry of the complexes have also been computed. The ligand, 4-phenylphenol, as well as the synthesized complexes show growth inhibitory activity against pathogenic fungus Fusarium oxysporum.

2

Synthesis, Characterization and Antibacterial Activity of Triorganotin(IV) Complexes of 4-Methylphenol

Sharma N., Kumar V., Thakur M., Kumari M., Chaudhry S. C.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 12

2051--2065

EN

The triorganotin(IV) com plex of com po si tion Ph3Sn(OArMe-4) has been synthesized in good yields by the reaction of Ph3SnCl with Me3SiOArMe-4/NaOArMe-4, while complexes of composition Me3Sn(OArMe-4) and n-Bu3Sn(OArMe-4) (where -OArMe-4 = -OC6H4CH3-4) have been obtained from the reaction of Me3SnCl and n-Bu3SnCl with 4-methylphenol in the presence of triethylamine in carbon tetrachloride. The complexes have been characterized by elemental analyses, molar conductance measurements, molecular weight determin tion and IR, 1H and 13C NMR and mass spectral studies. Thermal behaviour of the complexes has been studied by TG and DTA techniques. The organotin(IV) complexes have also been screened for their antibacterial properties and are found to exhibit appreciable activity. The reactions of the complexes with 2-, 3-, 4-cyanopyridines yielded 1:1 adducts as confirmed by physicochemical and IR spectral data.

3

Sensitive determination of zinc with N-hydroxy-N,N'-diphenylbenzamidine and diphenylcarbazone in airborne dust particulates

Thakur M., Deb M. K., Mishra R. K.

Chemia Analityczna

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1998

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Vol. 43, No. 5

843-851

EN

A sensitive as well as selective spectrophotometric method for the determinntion of zinc at trace level with N- hydroxy-N,N'- diphenylbenznmidine (HDPBA) and diphenylcarbazone (DPCZO) is described. The extraction of Zn(II) with HDPBA in chloroform occurs at pH from 8.2 to 10.3. The yellow coloured Zn(II)-HDPBA complex is changed in to pink coloured complex with the subsequent addition of DPCZO in the presence of ammonium persulphate. The molar absorptivity value of the Zn(II)-DPCZO complex is l.27 x 10(5) 1 mol(-1)cm (-1) at lmax 525 nm. The method followed Beer's law up to 80 ppb (0.08 ug ml(-1) in orgnic phase. The method has been successfully applied to the determination of zinc in dust-fall sample and standard samples.

PL

Opisano czułą i selektywną spektrofotometrycznq metodę oznaczenia śladowych ilości cynku przy utyciu N-hydroksy-N,N'- difenylobenzamidyny (HDPBA) i difenylokarbazonu (DFCZO). Ekstrakcja cynku HDPBA w chloroformie zachodzi przy pH od 8.2 do 10.3. Po dodaniu DPCZO i nadsiarczanu amonowego powstaje kompleks Zn-DPCZO i żółty kolor kompleksu Zn-HDPBA zmienia się w różowy. Molowy współczynnik absorpcji kompleksu Zn(II)-DPCZO przy lmax=525 nm wynosi 1.27 x 10(5) mol cm (-1). Metoda spełnia prawo Beera do 80 ppb (0.08 mg mk (-1)). Metoda została z powodzeniem zastosowana do oznaczania cynku w próbkach opadu pyłu i w próbkach standardowych.