
%0 Journal Article
%A Mason, R 
%A Scollary, GR 
%T Complexes containing unsaturated medium rings: The crystal and molecular structures of two rhodium(I) complexes
%J Australian Journal of Chemistry
%D 1978/04/01
%V 31
%N 4
%P 781-789
%K 
%R https://doi.org/10.1071/CH9780781
%U https://www.publish.csiro.au/paper/CH9780781 
%X The crystal and molecular structures of two rhodium(I) complexes with long-chain alkyne- or alkene-&#945;,&#969;-diyldiphosphines have been determined by single-crystal X-ray diffraction techniques. RhCl(CO){But2P(CH2)4C&#8801;C(CH2)4PBut2} crystallizes in the orthorhombic space group Pna21 with a 21.991 (2), b 11.915(1), c 11.890(1) &#506; and Z 4. The structure was refined by least-squares methods to a conventional R factor of 0.097 for 1768 independent reflections (Mo K&#945; diffraction data). The rhodium ion is in a square-planar coordination geometry with trans-phosphorus atoms; the unsaturated (alkynyl) group is not bonded to the rhodium. Crystals of RhCl{But2P(CH2)2CH=CH(CH2)2- PBut2} are monoclinic, space group P21/c, a 20.783(12), b 8.580(4), c 14.799(9) &#506;, &#946; 100.70(2)&#176;, Z 4. The structure analysis has converged to R 0.069 for 1417 reflections (Mo K&#945; diffractometry); the coordination geometry of the rhodium is again planar with the ethylenic group occupying a single bonding site. The effect of ring size on the rhodium-phosphorus bond lengths is discussed. 
