Abstract
Comparative analysis of the donor-acceptor capacities of diphosphine ligands in two series of complexes: cis-[Ru(bpy)2(LL)]q + [LL = 2,2'-bipyridine (bpy), o-benzoquinonediimine (bqdi), cis-1,2-bis(diphenylphosphino)ethane, cis-1,2-bis(diphenylphosphino)ethylene (dppen), (NH3)2, and (CO)2] and [Ru(NH3)4. (LL)]2 + (LL = bpy, dppen, and bqdi), was performed. Diphosphines are the strongest σ donors; they compare in π-acceptor capacity which is associated with phosphorus d orbitals with 2,2'-bipyridine and fall far short of o-benzoquinonediimine and carbonyl.
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Sizova, O.V., Ivanova, N.V. & Ershov, A.Y. Chemistry of Ruthenium Polypyridine Complexes: V. Electronic Structure of Ruthenium(II) Bipyridine-Diphosphine Mixed-Ligand Complexes. Russian Journal of General Chemistry 71, 1501–1505 (2001). https://doi.org/10.1023/A:1013943028114
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DOI: https://doi.org/10.1023/A:1013943028114