Get access

Tetrameric Iridium Hydride-Rich Clusters Formed under Hydrogenation Conditions


  • We thank Merck for an unrestricted grant (Y.X.) and Oxford and Istanbul Technical Universities (ITU-HPCC) for computing facilities. TÜBİTAK provided a six-month scholarship that enabled M.A.C. to work in Oxford in 2007. We gratefully acknowledge help from Dr. T. D. W. Claridge (NMR); Dr. N. Oldham and Dr. J. McCullagh (MS). Johnson-Matthey kindly provided a loan of iridium salts. Prof. Andrew Weller provided very helpful comments on this manuscript.


original image

Butterfly clusters: Hydrogenation of a cationic iridium complex with the sterically bulky N-ligand tetrahydroquinoline (thq) leads to the formation of two distinct tetrameric polyhydrides (see scheme; Ir green, N blue, P purple), which differ by exchanging one thq ligand for hydride. Both complexes have butterfly structures, with similar core geometries, but markedly different hinge angles (40.8° for 1 and 9.1° for 2).