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Organoarsonate- and Dimethylarsinate-Functionalized Hexamolybdates(V): A Multifaceted Study on Synthesis, Structural
Vinaya Siby1, Arun Pal1, Anupam Sarkar1
1School of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany.
Abstract:
We report on the synthesis, functionalization, and structural characterization of 11 novel dimethylarsinate-functionalized arsenomolybdates(V), [RAsMoV6O15(OH)3{AsO2(CH3)2}3]2- (R = HO, CH3, C2H5, C6H5, 3,5-(HOOC)2C6H3, 4-FC6H4, 4-F3CC6H4, 4-F3COC6H4, 4-BrC6H4, and 4-N3C6H4) and [AsIIIMoV6O15(OH)3{AsO2(CH3)2}3]3-, featuring a reduced hexanuclear {MoV6O24} core, peripherally coordinated by three dimethylarsinate ligands and centrally functionalized with diverse organoarsonate, arsenate, or arsenite groups, including carboxylated, fluorinated, brominated, and azido derivatives. Synthesized via a simple one-pot aqueous method, the compounds were thoroughly characterized by single-crystal X-ray diffraction, thermogravimetric analysis, and elemental analysis in the solid state. Solution-phase stability was assessed by multinuclear (1H, 13C, and 19F) nuclear magnetic resonance, while gas-phase behavior and fragmentation pathways were probed through electrospray ionization mass spectrometry, and tandem mass spectrometry (collision-induced dissociation). Antibacterial screening against Escherichia coli, Bacillus subtilis, and three pathogenic bacterial strains Listeria monocytogenes, Salmonella enterica, and Vibrio parahaemolyticus revealed that three of the 11 polyanions exhibit moderate antibacterial activity. Additionally, the synthesis of 3,5-bis(carboxy)phenylarsonic acid, 3,5-(HOOC)2C6H3AsO3H2, is reported here for the first time.
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