Molecular hydrogen complexes of the transition metals. 2. Evidence for a new complex, Mo(CO) (dppe)/sub 2/(H/sub 2/), and for solution equilibrium between dihydrogen and dihydride forms, M-eta/sup 2/-H/sub 2/ in equilibrium H-M-H, in W(CO)/sub 3/(PR/sub 3/)/sub 2/(H/sub 2/)

Journal Article · Wed Mar 19 00:00:00 EST 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00266a058· OSTI ID:5629621

Kubas, G J; Ryan, R R; Wrobleski, D A

Coordination of molecular hydrogen to transition metals is now firmly established, initially in the stable, structurally characterized complexes M(CO)/sub 3/(PR/sub 3/)/sub 2/(eta/sup 2/-H/sub 2/) (M = Mo, W; R = Cy, i-Pr), then in low-temperature stable Cr(CO)/sub 5/(H/sub 2/), and recently in IrH(H/sub 2/)(PPh/sub 3/)/sub 2/(C/sub 13/H/sub 8/N))SbF/sub 6/, (IrH/sub 2/(H/sub 2/)/sub 2/L/sub 2/)/sup +/, and (FeH(H/sub 2/)(dppe)/sub 2/)BF/sub 4/. In order to better define the steric and electronic requirements for H/sub 2/ to bind in molecular fashion rather than being cleaved to hydride ligands, reported here is new stable H/sub 2/ complex, Mo(CO)(dppe)/sub 2/(H/sub 2/) (dppe = diphenylphosphinoethane). Also, NMR evidence is presented for a dynamic equilibrium between the H/sub 2/ complex W(CO)/sub 3/(P-i-Pr/sub 3/)/sub 2/(eta/sup 2/-H/sub 2/), and an apparent dihydride complex, WH/sub 2/(CO)/sub 3/)P-i-Pr/sub 3/)/sub 2/, derived by oxidative addition of the H/sub 2/ ligand. 16 references, 2 figures.

• Research Organization: Los Alamos National Lab., NM
• OSTI ID: 5629621
• Journal Information: J. Am. Chem. Soc.; (United States), Vol. 108:6
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDRIDES
NUCLEAR MAGNETIC RESONANCE
HYDROGEN COMPLEXES
ELECTRONIC STRUCTURE
STEREOCHEMISTRY
MOLYBDENUM COMPLEXES
ORGANIC COMPOUNDS
TUNGSTEN COMPLEXES
EQUILIBRIUM
EXPERIMENTAL DATA
NMR SPECTRA
SOLUTIONS
COMPLEXES
DATA
DISPERSIONS
HYDROGEN COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
MIXTURES
NUMERICAL DATA
RESONANCE
SPECTRA
TRANSITION ELEMENT COMPLEXES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)