Abstract
Abstract New complexes of the type [Cr(AA)2(AA-N)(Me2SO)], where AA stands for l-amino acidato ligands (valinato, isoleucinato, and leucinato) and AA-N represents monodentate l-amino acidato ligands with an amino nitrogen as a donor atom, were prepared by heating mixtures of Cr(NO3)3·9H2O and sodium salts of amino acids in Me2SO. For all the amino acids used, only complexes of the type (+)546-[Cr(AA)2(AA-N)(Me2SO)] were obtained. The presence of a Me2SO molecule as a ligand was shown by the IR spectra of the crystals of the complexes. The bis-type complexes with l-valine and l-isoleucine were converted to (−)546-isomers in MeOH and the resulting products were isolated. All the new complexes were confirmed to have facial configuration, [Cr(O)3(N)3] from their UV-vis absorption spectra, as well as the corresponding tris-type complexes, [Cr(AA)3].
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