Structural and electrochemical properties of binuclear complexes containing 1,10-phenanthroline-5,6-diolate as a bridging ligand
- Univ. of Colorado, Boulder (United States)
Bis(triphenylphosphine)(1,10-phenanthroline-5,6-dilato)platinum(II), (PPh{sub 3}){sub 2}Pt(O{prime},O-PhD), may be prepared by treating 1,10-phenanthroline-5, 6-dione with Pt(PPh{sub 3}){sub 4}. The oxygen-bound diolate form of the PhD ligand can coordinate to an additional metal through the nitrogen donor atoms forming a binuclear complex with the (PPh{sub 3}){sub 2}Pt(O{prime},O-PhD) unit serving as a bipyridine-like ligand. Complexes of general form (PPh{sub 3}){sub 2}Pt(O{prime},O-PhD-N,N{prime})ML{sub n} have been prepared with ML{sub n} = PdCl{sub 2}, Ru(PPh{sub 3}){sub 2}Cl{sub 2}, and Pt(DBCat). The Pt,Pd and Pt,Ru complexes could not be characterized from elemental analytical data due to the presence of nonstoichiometric solvate molecules; crystallographic structure determinations provided information on both complexes. Structural features of both molecules include similar, planar P{sub 2}Pt(PhD)MCl{sub 2} regions, with additional axial PPh{sub 3} ligands for M = Ru, and C-O lengths for the PhD ligand that are typical of catecholate ligands. The electrochemical properties of the complexes consist of first and second electron oxidations of the PhD bridge for all three species, with an additional Ru{sup II}/Ru{sup III} couple for (PPh{sub 3}){sub 2}Pt(O{prime}, O-PhD-N, N{prime})Ru(PPh{sub 3}){sub 2}Cl{sub 2} and two additional catecholate oxidations for the DBCat ligand of (PPh{sub 3}){sub 2}Pt(O{prime}, O-PhD-N, N{prime})Pt(DBCat). Similarities in bonding between L{sub n}M(O{prime},O-PhD) species and the bipyridine and 1, 10-phenanthroline ligands is described. 13 refs., 3 figs., 6 tabs.
- OSTI ID:
- 5942305
- Journal Information:
- Inorganic Chemistry; (United States), Vol. 30:14; ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
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