title: Electrochemical behavior of phosphine-substituted ruthenium(II) polypyridine complexes with a single labile ligand.
abstract: A series of phosphine-substituted ruthenium polypyridine complexes, cis(P,Cl)-[Ru(trpy)(Pqn)Cl]PF6 (cis-Cl), trans(P,MeCN)-[Ru(trpy)(Pqn)(MeCN)](PF6)2 (trans-PN), cis(P,MeCN)-[Ru(trpy)(Pqn)(MeCN)](PF6)2 (cis-PN), and [Ru(trpy)(dppbz)(MeCN)](PF6)2 (PP), were synthesized and crystallographically characterized (trpy = 2,2':6',2″-terpyridine, Pqn = 8-(diphenylphosphanyl)quinoline, and dppbz = 1,2-bis(diphenylphosphanyl)benzene). In electrochemical measurements for cis-PN and PP, the reduction of cis-PN resulted in the formation of trans-PN via cis-trans isomerization and that of PP proceeded via a two-electron-transfer reaction. The mechanism of the electrochemical behaviors is discussed through consideration of five-coordinated species, [Ru(trpy)(Pqn)](n+) or [Ru(trpy)(dppbz)](n+) (n = 0-2), formed by liberation of a monodentate labile ligand.
authors: Department of Structural Molecular Science, School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI) , Shonan Village, Hayama-cho, Kanagawa 240-0193, Japan.
authors: Go
authors: G
authors: Nakamura
authors: Masaya
authors: M
authors: Okamura
authors: Masaki
authors: M
authors: Yoshida
authors: Takayoshi
authors: T
authors: Suzuki
authors: Hideo D
authors: HD
authors: Takagi
authors: Mio
authors: M
authors: Kondo
authors: Shigeyuki
authors: S
authors: Masaoka
mesh_terms: D018360:Crystallography, X-Ray; D008024:Ligands; D010720:Phosphines / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D008024:Ligands; D010720:Phosphines; D011725:Pyridines; D012428:Ruthenium; C023666:pyridine