title: (Nitro-kappaN)[2-(phenyldiazenyl-kappaN2)-pyridine-kappaN](2,2':6',2''-terpyridine-kappa3N)ruthenium(II) tetrafluoroborate.
abstract: The Ru-N bond distances in the title complex, [Ru(NO(2))(C(11)H(9)N(3))(C(15)H(11)N(3))]BF(4) or [Ru(NO(2))(tpy)(azpy)]BF(4), [tpy is 2,2':6',2"-terpyridine and azpy is 2-(phenylazo)pyridine], are Ru-N(py) 2.063 (4), Ru-N(azo) 2.036 (4), Ru-N(nitro) 2.066 (3) A, and Ru-N(tpy) 2.082 (4), 1.982 (3) and 2.074 (4) A. The azo N atom is trans to the nitro group. The azo N=N bond length is 1.265 (5) A, which is the shortest found in such complexes to date. This indicates a multiple bond between Ru and the N atom of the nitro group, and pi-backbonding [dpi(Ru) --> pi*(azo)] is decreased.
authors.affiliation: Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkla 90112, Thailand.
authors.forename: K
authors.initials: K
authors.lastname: Hansongnern
authors.forename: U
authors.initials: U
authors.lastname: Saeteaw
authors.forename: J
authors.initials: J
authors.lastname: Cheng
authors.forename: F L
authors.initials: FL
authors.lastname: Liao
authors.forename: T H
authors.initials: TH
authors.lastname: Lu