Synthesis and characterization of L-tartrato chromate(III) complexes with acetylacetonate ions

Abstract

Two acetylacetonato L-tartrato complexes, mononuclear [Cr(acac)₂(Htart)]^2– and dinuclear [Cr₂(acac)₂{(tart)₂H}]^3– where tart = C₄H₂O₆^4–, were synthesised and characterized by CD or ²H NMR and/or FAB mass spectroscopy. The former complex was found to be the first example to contain bidentate tartrato-O²,O³ bound through the alkoxo and hydroxyl oxygen atoms. The latter complex has a dinuclear structure bridged by two tetradentate tartrato-O¹,O² ligands with a Δ–Δ absolute configuration. The stereo specificity or -selectivity and magnetic behaviour were examined in comparison with analogous complexes.