113161-74-3Relevant academic research and scientific papers
Synthesis, Characterization, and Reactivity of the (η2-Acetone)pentaammineosmiun(II) Complex
Harman, W. Dean,Fairlie, David P.,Taube, Henry
, p. 8223 - 8227 (1986)
When 2+ is reduced in acetone a novel (η2-acetone)pentaammine complex is formed which shows markedly different reactivity from the ruthenium analogue.The crystal structure has been determined and C-O, Os-O, and Os-C bond lengths are found to be 1.32, 2.06,and 2.13 Angstroem, respectively.The ν(C-O) has been assigned by isotopic labeling to be 1330 cm-1.
Nitrile complexes of pentaammineosmium(II) and -(III)
Sekine,Harman,Taube, Henry
, p. 3604 - 3608 (2008/10/08)
Earlier work on nitrile complexes of (NH3)5Os2+ and (NH3)5Os3+ has been extended to include as ligands nitriles (RC≡N) that are stronger π acids. There is a progressive decrease in the C≡N stretching frequency for the Os(II) complexes along the series R = CH3, CH2=CH, C6H5, C6F5. The same order is observed for the Os(III) species, supporting the conclusion that back-bonding is significant also for Os(III). For the complexes of the nitriles with R = C6H5, C6F5, and C14H9 (9-anthracene), two absorption bands are observed in the visible region at energies below those attributable to the ligand itself, which are assigned to MLCT. For Os(III), at the present level of refinement, only when R = C14H9 do the UV-visible spectra reveal interesting features. There is a prominent peak at 453 nm, which we assign to MLCT. At still lower energies, a progression of peaks, with separations suggesting a vibrational component, is observed, which we tentatively ascribe to a ligand-centered singlet - triplet transition induced by the paramagnetic metal ion. When the complex of C6H5CN is prepared by the reaction of (NH3)5OsII with the ligand, two forms are observed. The minor component, in which the metal is bound to the ring in an η2 mode, is thought to rearrange slowly to the major N-bound form, by an intramolecular mechanism.
