
%0 Journal Article
%A Robertson, GB 
%A Tucker, PA 
%T Crystal and molecular structure of [IrH<sub>3</sub>(Pme<sub>2</sub>Ph)<sub>2</sub>]<sub>2</sub> : a novel (&#956;-H)<sub>2</sub> bridged Ir<sup>III</sup> dimer
%J Australian Journal of Chemistry
%D 1984/02/01
%V 37
%N 2
%P 257-263
%K 
%R https://doi.org/10.1071/CH9840257
%U https://www.publish.csiro.au/paper/CH9840257 
%X The preparation and characterization of the title compound are described. Crystals are orthorhombic, space group Pbca, with a 11.433(5), b 14.768(6), c 20.616(10) Å and Z 4. Diffraction data were recorded on a four-circle diffractometer. Least-squares analyses converged with R = 0.038 for 1897 unique data. Molecules are (pH), bridged dimers possessing strict crystallographic inversion symmetry. Metal atoms have a formal 16e- configuration and are approximately octahedrally coordinated by four H (two bridging) and two phosphine ligands. The Ir-Ir distance [2.739(1) Å] is intermediate between those in (µ-H)(µ-Cl) and (µH)3 bridged species. Ir-P distances [2.231(3) and 2.3132) Å, trans to bridging and terminal H atoms respectively] show the trans-influence of bridging H to be small, cf. terminal H. Molecules exhibit fluxional behaviour in solution. 
