
%0 Journal Article
%A Graddon, DP 
%A Townsend, IT 
%T Transition metal complexes of diethyl Cyclopentanone-2,5-diglyoxylate
%J Australian Journal of Chemistry
%D 1969/03/01
%V 22
%N 3
%P 505-511
%K 
%R https://doi.org/10.1071/CH9690505
%U https://www.publish.csiro.au/paper/CH9690505 
%X Diethyl cyclopentanone-2,5-diglyoxylate (ecgH2; IV) forms complexes of the type M(ecg)Bn with divalent transition metals, where M = Mn, Fe, Co, Ni, Cu, Zn; B = H2O or a heterocyclic base, and n = 1 (when M = Cu) or n = 2 (M = others). All complexes have the high-spin configuration. Infrared spectra show the presence of chelate &#946;-diketone rings and free carbonyl groups. Visible and near-infrared spectra support octahedral stereochemistry for the nickel(II) and cobalt(II) complexes. Molecular weights show the complexes to be dimeric. These results are consistent with an oxygen-bridged structure, M2L2B2n, in which base molecules are added above and below a planar M2L2 unit (VI). 
