The novel cyclometalated RU(III) complex, [Ru(η2-phpy)(trpy)Cl][PF6]·toluene 1, and the {Ru-NO}6 complex, [Ru-(η2-phpy)(trpy)NO][PF6]2 2, where trpy is 2,2′: 6′,2″-terpyridine and phpy is 2-phenylpyridine, have been prepared and characterized by elemental analysis, IR, 1H NMR, and electronic absorption spectroscopies, cyclic voltammetry, and crystallography. The crystal structure of 1 showed the chloride ion trans to the σ-bonding phenyl group of phpy and is an unusual example of a stable paramagnetic cyclometalated complex. The crystal structure of 2 shows the nitrosyl ligand trans to the σ-bonding phenyl group of phpy. The significant distortion of the normally linear Ru-NO bond angle (167.1(4)°) can be largely ascribed to the strong σ-donor properties of the phenyl group.

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Journal Inorganic Chemistry
Hadadzadeh, H. (Hassan), DeRosa, M.C, Yap, G.P.A. (Glenn P. A.), Rezvani, A.R. (Ali R.), & Crutchley, R. (2002). Cyclometalated ruthenium chloro and nitrosyl complexes. Inorganic Chemistry, 41(24), 6521–6526. doi:10.1021/ic020451f