
%0 Journal Article
%A Bruce, Michael I. 
%A Skelton, Brian W. 
%A Zaitseva, Natasha N. 
%A White, Allan H. 
%T Temperature Dependence of the Crystal Structure of Ru<emph tye="8">4</emph>(<emph type="2">&#181;</emph><emph tye="8">4</emph>-C<emph tye="8">2</emph>H<emph tye="8">2</emph>)(CO)<emph tye="8">9</emph>(<emph type="2">&eta;</emph>-PhMe)
%J Australian Journal of Chemistry
%D 1999/08/19
%V 52
%N 7
%P 681-684
%K 
%R https://doi.org/10.1071/CH99035
%U https://www.publish.csiro.au/paper/CH99035 
%X The thermal reaction between Ru4(&#181;4-C2H2)(CO)12 and toluene afforded Ru4(&#181;4-C2H2)(CO)9(&#951;-PhMe), whose crystal and molecular structures, determined at c. 300 and 153 K, are reported &#91;triclinic, P 1; a &#x2248; 8 . 0; b &#x2248; 10 . 4; c &#x2248; 13 . 7 &#197;, a &#x2248; 87; b &#x2248; 89 . 7; &#947; &#x2248; 70&#176;, Z = 2; conventional R values on &#124;F&#124; at convergence were 0 . 027 (300 K), 0 . 020 (153 K) for 4561, 4761 independent &#8216;observed&#8217; &#91;F &#62;4&#963;(F)&#93; reflections, respectively&#93;. At low temperature, the structure is a nicely ordered Ru4 butterfly with a C2H2 ligand sitting between the wing tips and an &#951;6 -PhMe ligand attached to one of the wing-tip atoms along the extension of the axis between them. At 300 K, a disordered component is evident, 9% occupancy of the wing-tip atom appended to toluene being displaced by 0 . 701(8) &#197; so that the bonding to the toluene approaches &#951;2; this is accompanied by a counterpart displacement of one of the hinge Ru atoms. It is suggested that this is the first stage of a putative migration of the arene from wing-tip to hinge Ru atoms. 
