Diphosphines metal hydrides

Table 3.2 pK, values of bis(diphosphine) metal hydrides in CH3CN. 

Studies of the acidity of a series of bis(diphosphine) metal hydrides in CH3CN show that they exhibit a wide range of acidity as shown in Table 3.2, cobalt bis(diphosphine) hydrides alone span about 27 pK, units in acidity. One-electron oxidation of the diamagnetic cobalt hydride HCo(dppe)2 gives the paramagnetic Co(ll) hydride [HCo(dppe)2], which is more acidic by about 14 pK, units. The dicationic cobalt hydride [HCo(dppe)2(NCCH3)] is very acidic, even with two... 

Mdssbauer spectra of bonding and structure in, 15 184-187 reactions with diborane, 16 213 stabilization of, 5 17, 18-19 cyanates, 17 297, 298 cyanide complexes of, 8 143-144 cyclometallated bipyridine complex, 30 76 diazene complexes, 27 231-232 dinitrogen complexes, 27 215, 217 diphosphine complexes of, 14 208-219 dithiocarbamates, 23 253-254 -1,2-dithiolene complexes, 22 323-327 hydrogen bonding, 22 327 halide complexes with phosphine, etc., 6 25 hexaflouride, structure, 27 104 hydride complexes, 20 235, 248-281, see also Transition metal-hydride complexes... 

Our understanding of the factors controlling metal hydride acidity and hydride acceptor abilities for nickel diphosphine complexes, together with the potential... 

Table 2 Metal-hydride BDEs, pKa s, and oxidation potentials for the corresponding bases for bis(diphosphine)...

Trialkylborane additives promote the reduction of carbon dioxide to formate, via bis(diphosphine) Ni(II) and Rh(III) hydride complexes. Late transition metal hydrides, which can be formed by the reaction with molecular H2, transfer hydride to CO2 to yield a formate-borane adduct. In order to drive this process, the borane must be of appropriate Lewis acidity hence, weaker... 

Table 7.2 p/

---