Strategy of synthesis, stability, and reactivity of bridged dinuclear polypyridine ruthenium (II) complexes
- St. Petersburg State Univ. (Russian Federation); and others
From analysis of three methods for synthesis of symmetrical dinuclear ruthenium (II) complexes [(LL){sub 2}XRu(BL)RuX(LL){sub 2}](BF{sub 4}{sub 2} (LL=2,2{prime}-bipyridyl, 1,10-phenanthroline; X=Cl, NO{sub 2}) with bridging ligands [BL=pyrazine (pyz), 4,4{prime}-bpy), and trans-1,2-bis (diphenylphosphino) ethylene (dppv)] the optimal way of obtaining these compounds was established, which involves destruction of the nitroso group coordinated in the mononuclear fragments cis-[Ru(LL){sub 2}(NO)X]{sup 2+} by azide ion, followed by introduction of a bridging ligand into a labile position of [Ru(LL){sub 2}(Solv)X]{sup +} under mild conditions. Dinuclear complexes are stable in acetonitrile and methanol solutions in darkness. The reactivity of these compounds in the dark is limited to replacement of the Cl ligands at elevated temperatures. Under the action of visible light photodissociation of the dimers with BL=pyz and 4,4{prime}-bpy into the fragments [Ru(LL){sub 2}(BL)X]{sup +} and [Ru(LL){sub 2}(Solv)X]{sup +} occurs, whereas the compounds with BL = dppv are photostable. Irradiation of mononuclear [Ru(LL);{sub 2}(BL)X]+ complexes results in photosolvation of the terminal ligands BL = pyz and 4,4{prime}-bpy. The quantum yields of these processes in acetone and methanol were measured. The nature of the bridging ligand is the main factor that determines the photochemical activity of the dimers. 27 refs., 2 figs., 3 tabs.
- OSTI ID:
- 198134
- Journal Information:
- Russian Journal of General Chemistry, Vol. 64, Issue 8; Other Information: PBD: 20 Jan 1995; TN: Translated from Zhurnal Obshchei Khimii; 64: No. 8, 1233-1241(Aug 1994)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis of, characterization of, and photoinduced processes in polymetallic triad complexes containing Fe(II), Ru(II), and Rh(III) metal centers
Photoinduced energy and electron transfer processes in supramolecular species. Tris(bipyridine) complexes of Ru(II)/Os(II), Ru(II)/Ru(III), Os(II)/Os(III), and Ru(II)/Os(III) separated by a rigid spacer