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

Journal Article · Wed Nov 10 04:00:00 EST 1993 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00075a048· OSTI ID:5035433

De Cola, L; Balzani, V ^[1]; Barigelletti, F; Flamigni, L ^[2]; Belser, P; Zelewsky, A von ^[3]; Frank, M; Voegtle, F ^[4]

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1. Univ. of Bologna (Italy)
2. FRAE-CNR, Bologna (Italy)
3. Univ. of Fribourg (Switzerland)
4. Univ. of Bonn (Germany)

The bis(bipyridine) bridging ligand 1,4-bis[2-(2,2[prime]-bipyridin-5-yl)ethenyl]bicyclo[2.2.2]octane(bpy-S-bpy), where S is a rigid spacer made of a bicyclooctane unit symmetrically linked to two ethylene-type units in an E, E-configuration, has been synthesized and its complexes (bpy)[sub 2]Ru(bpy-S-bpy)[sup 2+] (Ru[sup II][center dot]A), (bpy)[sub 2]Os(bpy-S-bpy)[sup 2+] (Os[sup II][center dot]A), (bpy)[sub 2]-Ru(bpy-S-bpy)Ru(bpy)[sub 2][sup 4+] (Ru[sup II][center dot]A[center dot]Ru[sup II]), (bpy)[sub 2]Os(bpy-S-bpy)Os(bpy)[sub 2][sup 4+] (Os[sup II][center dot]A[center dot]Os[sup II]), (bpy)[sub 2]Ru(bpy-S-bpy)-Os(bpy)[sub 2][sup 4+] (Ru[sup II][center dot]A[center dot]Os[sup II]) have been prepared as PF[sub 6[minus]] salts. The length of the rigid spacer S is 9 [angstrom], and the center-to-center separation distance in the dinuclear complexes is 17 [angstrom]. In all these novel compounds, each Ru-based and Os-based unit displays its own absorption spectrum and electrochemical properties, regardless of the presence of a second metal-based unit. The homometallic dinuclear compounds exhibit the same luminescence properties as the corresponding mononuclear species, whereas in the heterometallic dinuclear Ru[sup II][center dot]A[center dot]Os[sup II] species 91% of the Ru-based luminescence intensity is quenched by energy transfer to the Os-based unit, whose luminescence is accordingly sensitized (acetonitrile solution, room temperature).

• OSTI ID: 5035433
• Journal Information: Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 32:23; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
AZINES
BIPYRIDINES
CHEMISTRY
COMPLEXES
ELECTROCHEMISTRY
ELECTRON TRANSFER
ENERGY TRANSFER
HETEROCYCLIC COMPOUNDS
KINETICS
LUMINESCENCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OSMIUM COMPLEXES
PYRIDINES
RUTHENIUM COMPLEXES
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES