193064-66-3Relevant academic research and scientific papers
Weak M - H...H - C interactions observed in ruthenium and iridium complexes containing hydride, amine, and bulky phosphine ligands
Xu, Wei,Lough, Alan J.,Morris, Robert H.
, p. 475 - 482 (2007/10/03)
New amineruthenium and amineiridium hydride derivatives have been synthesized and characterized with the objective of observing intramolecular MH...HN or MH...HO interactions. These include RuHCl(CO)(L)(PPrj3)2 (1a, L = NH2NH2; 1b, L = NH3) and IrCl2(L)(H)(PCy3)2 (2a, L = SC(NH2)2; 2b, L = NH3; 2c, L = NH2NH2; 2d, L = NH2(CH2)3NH2; 2e, L = NH2OH). Instead, weak M - H...H - C van der Waals contacts have been detected in the solid state by X-ray analysis and in solution by NMR T1 measurements and nOe techniques. Both X-ray crystal structure analysis and minimum T1 measurements indicate that the H...H distances in the M - H...H - C interactions are ca. 2.0-2.2 A. The weak interactions might influence the course of deuteration of these complexes under D2 gas. The crystal and molecular structure of IrCl2(NH3)(H)(PCy3)2 2a has been determined by X-ray diffraction at 173 K: monoclinic, space group P21/n, a = 14.859(2) A, b = 18.579(3) A, c 7 18.548(3) A, β = 97.29(1)°, V = 5079.1(13) A3, Z = 4, full-matrix least-squares refinement on F2 for 10 953 independent reflections; R[F2 > 4σ(F2)] = 0.0283, wR(F2) = 0.0704.
