Ligand containing bridging hydride

A in ReHx(SiR3) species that do not contain a ligands.75 Bridging hydrides also exchange with >/2-SiH protons in the dinuclear Ru complex in Section 112... 

The vast majority of known polynuclear metal hydride complexes contains bridging hydride ligands. Obviously, the possibility of this bonding mode constitutes the main peculiarity of polynuclear compounds in comparison to mononuclear hydrides. Some representative examples of dinuclear complexes containing up to four hydride bridges are shown in Scheme 18.[54-56]... 

This equation does not predict the appropriate number of metal-metal bonds when the compound contains two-electron three-oenfer bonds. Many complexes containing more than one metal contain bridging hydride or alkyl ligands that participate in this type of bond. In these cases, the simple formula in Equation 1.1 typically overestimates the M-M bond orders. 

Co-condensation of Re atoms, benzene, and alkane (RH) results in alkane activation. The products are dirhenium systems containing bridging hydride ligands and bridging CR R whose nature depends upon the alkane. The ) -ray crystal structure of the y-CHBu derivative confirms the structural assignments. 

A study on the photochemical reaction of Re2(C0)jg with alkenes at ambient temperatures indicates formation of vinyl complexes Re2(p-H)(M2-d n -C2R R R )(CO)0 64 containing bridging hydride ligands. These molecules are fluxional on the n.m.r. time scale, undergoing rapid interchange of the a and tt bonds. Alkenes are eliminated by donor ligands.The complex... 

The geometry of triosmium derivatives containing a single unsupported (equatorial) bridging hydride ligand thus appears to be self consistent and pre-... 

Hydride complexes are present in a broad spectrum of literature, summarized in monographs [18-21], reviews [22-37], and a large series of original articles, for example, Ref. 38-44. The simplest two-electron a-donor ligand is the hydride 11 anion [3,11,18-27], It contains a pair of electrons, forming the two-center coordination a-bond, and can participate both as a terminal and as a bridge ligand. 

Treatment of trans-PtCl2(PHBut2)2 with NaBH4 affords a mixture of products which slowly convert to the spectroscopically-characterized 68 on standing in ethanol the complex contains both terminal and bridging hydride ligands.50... 

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