These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Monocationic trihydride and dicationic dihydride-dihydrogen and bis(dihydrogen) osmium complexes containing cyclic and acyclic triamine ligands: influence of the N-Os-N angles on the hydrogen-hydrogen interactions.
    Author: Baya M, Esteruelas MA, Oliván M, Oñate E.
    Journal: Inorg Chem; 2009 Mar 16; 48(6):2677-86. PubMed ID: 19220051.
    Abstract:
    New monocationic trihydride and dicationic dihydride-dihydrogen and bis(dihydrogen) osmium complexes with cyclic and acyclic triamines have been prepared and characterized. The treatment of OsH(3)Cl(P(i)Pr(3))(2) (1) with 1,4,7-triazacyclononane (TACN) in toluene at 60 degrees C affords the monocationic trihydride [OsH(3)(TACN)(P(i)Pr(3))]Cl (2), which reacts with HBF(4) to give the dicationic dihydride-dihydrogen [OsH(2)(TACN)(eta(2)-H(2))(P(i)Pr(3))](BF(4))(2) (3). Complex 1 also reacts with 1,4,7-triazacyclodecane (TACD) and bis(2-aminoethyl)amine (BAEA). Similarly to TACN, the reaction of 1 with TACD gives a monocationic trihydride derivative [OsH(3)(TACD)(P(i)Pr(3))]Cl (4), which in the presence of HBF(4) generates a dicationic dihydride-dihydrogen [OsH(2)(TACD)(eta(2)-H(2))(P(i)Pr(3))](BF(4))(2) (5). However, the treatment of 1 with BAEA leads to the monocationic trihydride [OsH(3)(BAEA)(P(i)Pr(3))]Cl (6), which in the presence of HBF(4) affords the dicationic bis(dihydrogen) [Os(BAEA)(eta(2)-H(2))(2)(P(i)Pr(3))](BF(4))(2) (7). The structures of 2-4 and 6 have been determined by X-ray diffraction analysis, and the position of the hydrogen atoms bonded to the metal center was confirmed by density functional theory calculations. The geometries of 2, 4, and 6 have been rationalized as pentagonal bipyramids and their behavior on the basis of the N(meridional)-Os-N(meridional) angle of the bipyramids.
    [Abstract] [Full Text] [Related] [New Search]