Complex polyhydrides

After the advent of the nonclassical if-Vi.2 complexes, polyhydrides had to be reinterpreted [14]. Thus, RuH4(PPh3)3 is not a classical tetrahydride of coordination number seven at the ruthenium atom but a dihydride-dihydrogen complex Ru(H2)(H)2(PPh3)3 of octahedral geometry [25]. 

Bayse, C.A. and Hall, M.B. (1999) Prediction of the Geometries of Simple Transition Metal Polyhydride Complexes hy Symmetry Analysis. Journal of the American Chemical Society, 121, 1348-1358. 

Polynuclear complexes associated with transition metal polyhydrides and silver cations have been described those which present silver—metal bonds are more numerous and they will be... 

Generation of Reactive Intermediates via Photolysis of Transition-Metal Polyhydride Complexes... 

The photochemical properties of several transition metal polyhydride complexes are described. Irradiation of [MoH Cdppe) ] (dppe =... 

A number of studies have demonstrated that photolysis of transition metal di- and polyhydride complexes can lead to the generation of very reactive intermediates, generally via photo-induced loss of H9 Cl, 2). Two such examples are shown in eqs 1 (3) and 2 (4-8). Z... 

Photoinduced reductive elimination of from polyhydride complexes, HxMLn (x > 3) can, in principle, lead to the generation... 

Since photolysis of monomeric di- and polyhydride transition metal complexes often leads to elimination of H2 as the... 

In this regard a more significant determination should be obtained from a study of the polyhydride complexes [ReH7(PR3)2], in that (i) if the complex is a classical hydride the rhenium atom would be in its maximum oxidation state (+ 7) and, therefore, could not undergo further oxidation processes (ii) if the complex is a non-classical hydride, the rhenium atom would be in a lower oxidation state and, consequently, could display oxidation processes. 

Moreover, Dimeric and trimeric Ir(III) polyhydride complexes (Fig. 5) were formed from the reaction of [lr(3)(COD)]PF6 with molecular hydrogen at atmospheric pressure and were found to inhibit catalytic activity. 

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