A linear free-energy relationship exists between the half-wave potentials of the (II/I) couples of Ni(diphosphine)2 complexes and the hydride donor ability (ΔG°H -) of the corresponding [HNi(diphosphine)2]+ complexes. A similar correlation is observed between the half-wave potentials of the (I/O) couples of Ni(diphosphine)2 complexes and the pKa values (or ΔG°H +) of the corresponding [HNi(diphosphine)2]+ complexes. As a result, it is possible to use the potentials of these two couples to predict the free energies of all three Ni-H bond cleavage reactions, ΔG°H+, ΔG°H·, and ΔG°H-, for this class of nickel complexes. The molecular structures of Ni(Et2PCH2CH2 PPh2)2 and Ni(Ph2PCHCHPPh2)2 were determined by single-crystal X-ray diffraction studies.
|Number of pages||8|
|Publication status||Published - Apr 30 2001|
ASJC Scopus subject areas
- Inorganic Chemistry
- Organic Chemistry