Synthesis, Characterisation, and Preliminary In Vitro Studies of Vanadium(IV) Complexes with a Schiff Base and Thiosemicarbazones as Mixed Ligands

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Chemistry and Biochemistry


[VO(sal-L-tryp)(H2O)] (1, sal-L-tryp = N-salicylidene-L-tryptophanate) was used as a precursor to produce the new complexes [VO(sal-L-tryp)(MeATSC)].1.5C(2)H(5)OH [2, MeATSC = 9-Anthraldehyde-N(4)-methylthiosemicarbazone], [VO(sal-L-tryp)(N-ethhymethohcarbthio)]center dot H2O [3, N-ethhymethohcarbthio = (E)-N-ethyl-2-(4-hydroxy-3-methoxybenzylidene)-hydrazinecarbothioamide] and [VO(sal-L-tryp)(acetylethTSC)]center dot C2H5OH {4, acetylethTSC = (E)-N-ethyl-2-[1-(thiazol-2-yl) ethylidene]hydrazinecarbothioamide} by reaction with the respective thiosemicarbazone. The chemical and structural properties of these ligands and complexes were characterised by elemental analysis, ESI-MS, FTIR, UV/Vis, ESR and H-1 and C-13 NMR spectroscopy and X-ray crystallography. Dimethyl sulfoxide (DMSO) and [D-6]DMSO solutions of 1-4 were oxidised in air to produce vanadium(V) species, which were verified by ESI-MS and V-51 NMR spectroscopy. The anticancer properties of 2-4 were examined with three colon cancer cell lines, HTC-116, Caco-2 and HT-29, and noncancerous colonic myofibroblasts, CCD18-Co. Compounds 2-3 exhibited less inhibitory effects in the CCD-18Co cells, which indicates a possible cytotoxic selectivity towards colon cancer cells. In general, compounds that exhibit antiproliferative activity to cancer cells but do not affect noncancerous cells may have a potential in chemotherapy.

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European Journal of Inorganic Chemistry



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