Decavanadate, HxV10O28(6−x) − (V10), is the predominant species formed in vanadate solutions at vanadium (V) concentrations above 1 mM in the pH range of ≈2–6. The symmetrically non-equivalent vanadium atoms VA, VB and VC generates three different signals in 51V NMR spectra as −425 ppm, −505 ± 15 ppm and −525 ± 15 ppm, respectively. Despite extensive decavanadate chemistry, there are only 27 complexes, in which V10 acts as a ligand for transition metals ions. The primary focus of our study was on the synthesis of novel V10 complexes with Co(II) central atom as well as lanthanoids, such complexes were unprecedented till date. Significantly, we inspected potential applications emerging from the finding that the complexes may remain intact in solution, and do not decompose into lower vanadates as is usual for the free V10 species. We evaluated that V10 complexes with Co(II) have exhibited better photocatalytic activity as water oxidation catalysts (WOC). We also studied interactions of the free and coordinated V10 with three model proteins (proteinase K, lysozyme, thaumatin) to assess their potential to act as crystallization additives, and some striking differences were evident in the intensity of the interaction as confirmed by 51V NMR spectroscopy.
Sincere thanks to RNDr. Lukáš Krivosudský, PhD supervisor. The characterization analysis presented in this work has been done in collaboration with many researchers and professors from different faculties and universities. So, hereby we acknowledge and express our heartfelt thanks and gratitude to all of them as follows, who have directly and indirectly helped and contributed in materializing this work : Water Oxidation Catalysis analysis - Dr. Alexey Cherevan from TU Wien, Toxicity studies - Assoc. Prof. Miroslava Supolikova PhD, Department of microbiology and virology from Comenius university in Bratislava, ICP-MS analysis- Dr. Marek Bujdos from Comenius university in Bratislava , XRD - Assoc. Prof. Robert Gyepes, PhD from Charles university, Prague.
I thank all the members of the reviewing committee of the XIV. year of Interactive Conference of Young Scientists for evaluation of this work.
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