Synthesis, structural studies and biological activity of a dioxovanadium(v) complex with pyridoxal semicarbazone.

Reaction between the NH4VO3 and pyridoxal semicarbazone (PLSC) in a methanol/ammonia solution forms an orange, diamagnetic, mononuclear NH4[VO2(PLSC-2H)] complex in which vanadium is in the oxidation state +5, and pyridoxal semicarbazone is coordinated in its dianionic form. The complex cocrystallizes with a neutral molecule of PLSC and two water molecules. The coordination environment around vanadium can be described as an almost ideal square-pyramid. The complex was characterized by elemental analysis, conductometric and magnetochemical measurements, IR spectra, X-ray diffraction, and in vitro cytotoxicity analysis.