ARSENOBETAINES - POTENTIAL BIDENTATE LIGANDS AND OPTIMISED CRYSTAL STRUCTURE OF NEW METAL(II)-ARSENIC HYBRID COMPOUNDS

The aromatic synthetic arsenobetaines were prepared and their coordination to the metal ions (Mg and Cu(II)) was studied using LR, MS-El (ES), UV-vis. and EPR spectroscopic methods. The lower calculated separation value (A) between asymmetric and symmetric stretching vibrations of the carboxylate moiety predicted the bidentate coordination mode of the synthesised coordination compounds. The EPR spectrum showed square-planar coordination mode of the copper(II) central atom as well. The DFT method was used for optimisation of crystal structure of the metal(II)-arsenobetaine complex cations. The testing of antimicrobial and antifungicidal bioactivity of the novel synthesised compounds will be next task of these studies.