Synthesis and Application of Chelated Complexes [Zn(Z-arg)2(H2O)] and [[Zn(Z-arg)2(H2O)](SO4)]2- as Chiral Selectors

By interaction of compounds Zn(II) and L-arginine (L-Arg) the chelated complexes [Zn(L-arg)2(H2O)] (I) and [[Zn(L-arg)2(H2O)](SO4)]2- (II) (L-arg is a deprotonated form of L-Arg) were synthesized. The structure of the obtained complexes was established by IR spectroscopy by comparing the experimental and theoretical IR spectra using quantum chemical modeling. Complexes I and II were studied as chiral selectors of enantioselective voltammetric sensors. It was shown that I exhibits better enantioselective compared to II. By DFT method, it was found that the difference in the exhibited enantioselectivity of complexes I and II can be due of the geometric isomerism of chelate compounds and the peculiarities of the coordination of the obtained complexes with the analyte molecule.