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In this study, the first complexes of Zn(II) with the N-benzyloxycarbonyl-S-alaninato ligand (N-Boc-S-ala) were synthesized. The new complexes were characterized by elemental analysis, conductometric measurements, IR, 1 H-NMR, 13 C-NMR and 2D-NMR spectroscopy. On the basis of the experimental data, tetrahedral geometry of the Zn(II) complexes was proposed. A very good agreement between the NMR and DFT calculated data was obtained. Investigation of antimicrobial activity of the newly synthesized complexes was also performed. It was established that [Zn(N-Boc-S-ala) 2 ] was selective and acts only on Candida albicans.

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The title compound, [Co(C(9)H(10)NO(3))(2)(C(2)H(8)N(2))]Cl.4H(2)O, is one of six possible diastereomers of the (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex. The cobalt(III) ion has an octahedral coordination, with three five-membered chelate rings which have deformed coordination angles and coordinated O atoms in trans positions. In comparison with the previously reported crystal structure of the Delta-C(1)-cis(O) diastereomer [Miodragović et al. (2001). Enantiomer, 6, 299-308], the compound presented in this paper has more planar five-membered aminocarboxylate rings. Complex cations, chloride anions and water molecules of crystallization are linked together by a network of hydrogen bonds. The chloride anions lie approximately between two Co atoms and form hydrogen bonds with all coordinated NH(2) groups. In the crystal structure, there is a weak intermolecular pi...pi interaction between the phenyl rings.