Ru(II) polypyridine complexes: photophysics, photochemistry, eletrochemistry, and chemiluminescence

Ruthenium compounds, particularly Ru(II) polypyridine complexes, are the class of transition metal complexes which has been most deeply investigated from a photochemical viewpoint. The reason for such great interest stems from a unique combination of chemical stability, redox properties, excited-state reactivity, luminescence emission, and excited-state lifetime. Ruthenium polypyridine complexes are indeed good visible light absorbers, feature relatively intense and long-lived luminescence, and can undergo reversible redox processes in both the ground and excited states. This chapter presents some general concepts on the photochemical properties of Ru(II) polypyridine complexes and gives an overview of various research topics involving ruthenium photochemistry which have emerged in the last 15 years. In particular, aspects connected to supramolecular photochemistry and photophysics are discussed, such as multicomponent systems for light harvesting and photoinduced charge separation, systems for photoinduced multielectron/hole storage, and photocatalytic processes based on supramolecular Ru(II) polypyridine species. Interaction with biological systems and dye-sensitized photoelectrochemical cells are also briefly discussed.

Photochemistry and Photophysics of Coordination Compounds: Ruthenium

– hydrogen bonds. The one-pot self-assembly reaction features an exceptional number of different design elements—some well precedented and others less well known within the context of directing the formation of (supra)molecular species. We anticipate that the strategies and tactics used here can be applied to the rational synthesis of other higher-order interlocked molecular architectures.

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A synthetic molecular pentafoil knot

The transition metal coordination chemistry of anion radicals

Renaissance of annulene chemistry.

Resultats d'etudes, a temperatures basse et ambiante, par voltammetrie cyclique et spectrometrie, du comportement, dans CH 3 CN, d'une serie de complexes [Ru(HDPA) n (bpy) 3−n ] 2+ (1) (n=0−3), [Ru(DPA) n (bpy) 3−n ] ( 2 −n)u + (2) (n=0−3) et [Ru(HDPA) n (DPA) 3−n ] (N−1)u + (3) (n=0−3) avec HDPA=di-pyridyl-2 amine; DPA − =dipyridylamine deprotonee et bpy=bipyridine-2,2'. Donnees sur les processus de reduction et d'oxydation. Spectres RPE

Unique redox and spectroscopic properties of dipyridylamine complexes of d6 transition metals: electrochemical behavior

Donnees theoriques et cas de [Ru(bpy) 3 ] 2+ , [Ru(4,4'-(CO 2 Et) 2 bpy) 3 ] 2+ et de 4,4'-(CO 2 Et) 2 bpy dans du DMF contenant de l'hexafluorophosphate de tetraethylammonium, avec bpy=bipyridyle-2,2' et (CO 2 Et) 2 -4,4'bpy=diethylcarboxy-4,4' bipyridyle-2,2'

Spatially isolated redox orbitals: evidence from low-temperature voltammetry

A proton NMR study of reduced paramagnetic tris(2,2'-bipyridine) complexes of iron(II), ruthenium(II) and osmium(II)

Calculs MNDO sur bipyridyle-2,2', ses derives disubstitues en 4,4' et 5,5' par -CO 2 H et les complexes de Ru (II) correspondants

Yasuhiko Ohsawa

Papers

Unique redox and spectroscopic properties of dipyridylamine complexes of d6 transition metals: electrochemical behavior

Spatially isolated redox orbitals: evidence from low-temperature voltammetry

A proton NMR study of reduced paramagnetic tris(2,2'-bipyridine) complexes of iron(II), ruthenium(II) and osmium(II)

Molecular orbital study of the substituent effect on the redox properties of disubstituted bipyridines and their ruthenium(II) complexes

Spatially isolated redox orbitals: evidence from low-temperature voltammetry