Formation and equilibrium structures of metal dihydrogen and dihydride complexes (L = ligand)
Dihydrogen complexes are coordination complexes containing intact H2 as a ligand. They are a subset of sigma complexes.[1] The prototypical complex is W(CO)3(PCy3)2(H2). This class of compounds represent intermediates in metal-catalyzed reactions involving hydrogen. Hundreds of dihydrogen complexes have been reported. Most examples are cationic transition metals complexes with octahedral geometry.
Upon complexation, the H−H bond is extended to 0.81–0.82 Å as indicated by neutron diffraction, about a 10% extension relative to the H−H bond in free H2. Some complexes containing multiple hydrogen ligands, i.e. polyhydrides, also exhibit short H−H contacts. It has been suggested that distances < 1.00 Å indicates significant dihydrogen character, where separations > 1 Å are better described as dihydride complexes (see figure).
^Kubas, Gregory J. (2001-08-31). Metal Dihydrogen and σ-Bond Complexes: Structure, Theory, and Reactivity (1 ed.). Springer. ISBN 0-306-46465-9.
and 26 Related for: Dihydrogen complex information
Dihydrogencomplexes are coordination complexes containing intact H2 as a ligand. They are a subset of sigma complexes. The prototypical complex is W(CO)3(PCy3)2(H2)...
bond. Dihydrogencomplexes are examples. Transition metal silane complexes are often especially stable sigma complexes. A subset of sigma complexes are...
for the eight C−H bonds. Transition metal complexes that feature multiple bonds, such as the dihydrogencomplex, have sigma bonds between the multiple bonded...
Hbase+ Such reaction are assumed to involve the intermediacy of dihydrogencomplexes. Bifunctional catalysts activate H2 in this way. The values shift...
organometallic compound with the formula W(CO)6. This complex gave rise to the first example of a dihydrogencomplex. Like its chromium and molybdenum analogs, this...
to give a dihydride complex via oxidative addition (preceding the oxidative addition of H2 is the formation of a dihydrogencomplex): LnM + H2 → LnMH2...
The dihydrogen cation or hydrogen molecular ion is a cation (positive ion) with formula H+ 2. It consists of two hydrogen nuclei (protons), each sharing...
R3−nHnPBH3, are adducts of organophosphines and borane. Borane(5) is the dihydrogencomplex of borane. Its molecular formula is BH5 or possibly BH3(η2-H2). It...
hydrogenations. Hydrosilanes form sigma complexes with unsaturated metals. The bonding is similar to that in dihydrogencomplexes but stronger. One example is...
and Theoretical Calculations for Fe, Ru, and Os Metal Hydrides and DihydrogenComplexes". The Journal of Physical Chemistry A. 113 (3): 551–563. Bibcode:2009JPCA...
In chemistry, a dihydrogen bond is a kind of hydrogen bond, an interaction between a metal hydride bond and an OH or NH group or other proton donor. With...
implicated in cancer and Down syndrome and vascular disease. It inhibits Complex IV of the mitochondrial electron transport chain, which effectively reduces...
includes the thermally unstable dihydrogencomplexes for the sake of completeness. As with the above table, only the complexes with the most complete valence...
is a gas of diatomic molecules with the formula H2, sometimes called dihydrogen, but more commonly called hydrogen gas, molecular hydrogen or simply hydrogen...
acidity scale of phosphonium tetraphenylborate salts and ruthenium dihydrogencomplexes in dichloromethane" Can. J. Chem. 84(2): 164–175 (2006). doi:10.1139/V05-236...
(March 1994). "New dihydrogencomplexes: the synthesis and spectroscopic properties of iron(II), ruthenium(II), and osmium(II) complexes containing the meso-tetraphos-1...
Waals interactions, an effect of the large electron clouds of polonium. Dihydrogen dichalcogenides have the chemical formula H2X2, and are generally less...
Jeffery (1991). "Preparation and Spectroscopic Properties of the η2-DihydrogenComplexes [MH(η2-H2)PR2CH2CH2PR2)2]+ (M = Iron, Ruthenium; R = Ph, Et) and...
Toulouse (UMR 5215 INSA-CNRS-UPS). Chaudret synthesized the first bis(dihydrogen) complex and demonstrated its high reactivity, particularly for the activation...
such molecule to be synthesized with a coordinated hydrogen ligand (dihydrogencomplex): W(CO)3(PPri3)2(η2-H2). Classic dihydrides containing the dihydride...
actual catalyst. A possible role for colloidal platinum or zero-valent complexes has also been considered. Chloroplatinic acid prepared from aqua regia...
with the H−H bonding distance of 0.74 Å. This interaction is called a dihydrogen bond. The original crystallographic analysis of this compound reversed...
(2016-08-10). "Brønsted–Lowry Acid Strength of Metal Hydride and DihydrogenComplexes". Chemical Reviews. 116 (15): 8588–8654. doi:10.1021/acs.chemrev...
Chemistry (IUPAC). Another name is dihydrogen monoxide, which is a rarely used name of water, and mostly used in the dihydrogen monoxide parody. Other systematic...
suited for simple diatomic molecules such as dihydrogen, dioxygen, and carbon monoxide but becomes more complex when discussing even comparatively simple...
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