title: Visible-light photoisomerization and photoaquation of trans-[Ru(1,3,5-triaza-7-phosphaadamantane)4Cl2] in organic solvent and water.
abstract: The interaction of the PTA (PTA = 1,3,5-triaza-7-phosphaadamantane) ruthenium complex trans-[RuCl(2)(PTA)(4)] (trans-1) with visible light in chloroform and in water has been studied at room temperature. The complex trans-1 isomerizes to the cis isomer in CHCl(3) with radiation of lambda > 416 nm (Phi(434 nm) (CHCl(3)) = 0.13 +/- 0.01). The isomerization reaction is reversible as cis-1 is transformed into trans-1 with lambda = 367 nm (Phi(367 nm) (CHCl(3)) = 0.25 +/- 0.02). Irradiation at lambda > 416 nm of a solution of trans-1 in water leads to the cis-isomer complex and to the aqua complex (OC-6-32)-[RuCl(H(2)O)(PTA)(4)]Cl (2Cl) by a photoisomerization and photoaquation reaction (Phi(434 nm) (D(2)O) = 0.27 +/- 0.02). The mole ratio of cis-1 to 2Cl is not dependent on the pH but on the concentration of the products in solution. Isomerization in water is not reversible even if only cis-1 is present in solution. Synthesis and characterization of (OC-6-32)-[RuCl(H(2)O)(PTA)(4)](CF(3)SO(3)) (2CF(3)SO(3)) are also presented.
authors.affiliation: Area de Química Inorgánica, Facultad de Cien-16.50cias, Universidad de Almería, Spain.
authors.forename: Rugiada
authors.initials: R
authors.lastname: Girotti
authors.forename: Antonio
authors.initials: A
authors.lastname: Romerosa
authors.forename: Sonia
authors.initials: S
authors.lastname: Mañas
authors.forename: Manuel
authors.initials: M
authors.lastname: Serrano-Ruiz
authors.forename: Robin N
authors.initials: RN
authors.lastname: Perutz