Crystal structure of bis-[di-µ-(phenylmethoxo)-bis(pentane-2,4-dionato)dicopper(II)]
Abstract
The crystal and molecular structures of the title compound have been determined by single-crystal X-ray diffraction by use of three-dimensional photographic data, and refined anisotropically to R 10·1% for 1691 independent observed reflections. The blue crystals are monoclinic, space group P21/c with a 11·53 ± 0·03. b= 22·68 ± 0·05, c= 10·19 ± 0·03 Å, and β= 112·0 °± 0·3°. The unit cell contains two centrosymmetric tetrameric molecules, each consisting of two approximately planar benzoxy-bridged dinners (acac)Cu(µ-OCh2Ph)2Cu(acac) joined together by four apical Cu–O bonds involving one benzoxy and one acetylacetonate (acac) oxygen atom of each dimer, of lengths 2·42 Å(benzoxy) and 2·71 Å(acac). The Cu2O2 unit in the dimer is planar, with mean bond lengths 1·88(1) to the three- and 1·94(1)Å to the four-co-ordinate oxygen atom. The possible significance of the presence of both kinds of bridging atoms in relation to the magnetic properties of this and similar complexes is briefly noted.