10.1021/om060395g.s001 Beatriz Eguillor Beatriz Eguillor Miguel A. Esteruelas Miguel A. Esteruelas Montserrat Oliván Montserrat Oliván Preparation, X-ray Structures, and NMR Spectra of Elongated Dihydrogen Complexes with Four- and Five-Coordinate Tin Centers American Chemical Society 2006 NMR time scale ligand dihydrogen benzoic acid Elongated Dihydrogen Complexes tin atom exchanges 2006-09-11 00:00:00 Dataset https://acs.figshare.com/articles/dataset/Preparation_X_ray_Structures_and_NMR_Spectra_of_Elongated_Dihydrogen_Complexes_with_Four_and_Five_Coordinate_Tin_Centers/3060214 Complex OsH<sub>3</sub>(SnPh<sub>2</sub>Cl){[η<sup>2</sup>-CH<sub>2</sub>C(CH<sub>3</sub>)]P<sup>i</sup>Pr<sub>2</sub>}(P<sup>i</sup>Pr<sub>3</sub>) (<b>1</b>) undergoes protonation−addition of benzoic acid to give the elongated dihydrogen derivative Os(SnPh<sub>2</sub>Cl)(κ<sup>2</sup>-O<sub>2</sub>CPh)(η<sup>2</sup>-H<sub>2</sub>)(P<sup>i</sup>Pr<sub>3</sub>)<sub>2</sub> (<b>2</b>). In solution the tin atom exchanges with the osmium on the chloride ligand by one of the oxygen atoms of the carboxylate group to afford (<b>3</b>). Treatment of the latter with 1.0 equiv of benzoic acid leads to (<b>4</b>). The elongated dihydrogen ligands of <b>2</b> and <b>3</b> show blocked rotation on the NMR time scale, whereas the hydrogen atoms undergo quantum exchange coupling. The X-ray structures of <b>3</b> and <b>4</b> are also reported.