Synthesis and Application of Chelate Complexes [Zn(L-arg)2(H2O)] and [[Zn(L-arg)2(H2O)](SO4)]2– as Chiral Selectors

Chelate complexes based on Zn(II) ions and L-arg (L-arg) were synthesized as compounds [Zn(L-arg)₂(H₂O)] (I) and [[Zn(L-arg)₂(H₂O)](SO₄)]^2– (II) (L-arg refers to the deprotonated form of L‑arg). The structure of the resulting complexes was determined by IR spectroscopy through comparison of experimental and theoretical IR spectra calculated using quantum chemical modeling. Complexes I and II were studied as chiral selectors for enantioselective voltammetric sensors. It was shown that I exhibits better enantioselective properties compared to II. DFT calculations indicated that the difference in the enantioselectivity of complexes I and II may be attributed to the geometric isomerism of the chelate compounds and the specific coordination features of the complexes with analyte molecules.