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

Photophysics, photochemistry and solar energy conversion with tris(bipyridyl)ruthenium(II) and its analogues

The ruthenium complexes [Ru(dcbpyH2)2(Cl)2] (1), [Ru(dcbpyH2)2(NCS)2] (2), (Bu4N)4[Ru(dcbpy)2(NCS)2] (3), and (Bu4N)2[Ru(dcbpyH)2(NCS)2] (4) were synthesized and characterized by cyclic voltammetry, UV−vis absorption, and emission, IR, Raman, and NMR spectroscopy. The absorption and emission maxima of these complexes red shifted with decreasing pH, and showed pH-dependent excited-state lifetimes. The ground-state pKa values were determined by spectrophotometeric methods, and the dissociation of protons was found to occur in two steps (pKa = 3 and 1.5). The Ru(II)/(III) couple in the complex (Bu4N)4[Ru(dcbpy)2(NCS)2] is shifted ca. 290 mV negatively with regard to that of the complex [Ru(dcbpyH2)2(NCS)2] due to the replacement of H+ by tetrabutylammonium cation. The negative shift for the dcbpy-based reduction potential is even larger, i.e., about 600 mV compared to that of the complex [Ru(dcbpyH2)2(NCS)2]. The effect of deprotonation on the performance of these complexes as photosensitizers for nanocrysta...

Acid-Base Equilibria of (2,2'-Bipyridyl-4,4'-dicarboxylic acid)ruthenium(II) Complexes and the Effect of Protonation on Charge-Transfer Sensitization of Nanocrystalline Titania.

The industrial preparation of many chemicals relies on the unparalleled rate and selectivity enhancements offered by metal compounds in solution. In many cases, the best catalysts rely on the scarcest elements, such as rhodium, iridium, and platinum. The cost of these materials has long driven efforts to make soluble catalysts out of cheaper, more Earth-abundant metals ( 1 ), often by modifying their reactivity with their surrounding ligands. This is especially true for catalyzing reduction-oxidation, or redox, reactions, which are critical not only in catalysis but in energy generation and storage. Such reactions usually change the oxidation state of the metal in solution. We discuss why there can be advantages to having the redox changes occur in the ligands instead.

https://science.sciencemag.org/content/sci/327/5967/794.full.pdf

Radical Ligands Confer Nobility on Base-Metal Catalysts

http://projects.itn.pt/HeterNetworks_SRabaca/Coordination_Chemistry_Reviews_227_2002_93_127.pdf

Metal bis-1,2-dithiolene complexes in conducting or magnetic crystalline assemblies

The Electronic Structures of Square-Planar Metal Complexes. V. Spectral Properties of the Maleonitriledithiolate Complexes of Nickel, Palladium, and Platinum

The Toluenedithiolate and Maleonitriledithiolate Square-Matrix Systems

The Electronic Structures of Square-Planar Metal Complexes. II. The Complexes of Maleonitriledithiolate with Copper(II), Nickel(II), Palladium(II), and Platinum(II)

Excited state proton transfer of a metal complex: determination of the acid dissociation constant for a metal-to-ligand charge transfer state of a ruthenium(II) complex

Raymond. Williams

Papers

The Electronic Structures of Square-Planar Metal Complexes. V. Spectral Properties of the Maleonitriledithiolate Complexes of Nickel, Palladium, and Platinum

The Toluenedithiolate and Maleonitriledithiolate Square-Matrix Systems

The Electronic Structures of Square-Planar Metal Complexes. II. The Complexes of Maleonitriledithiolate with Copper(II), Nickel(II), Palladium(II), and Platinum(II)

Excited state proton transfer of a metal complex: determination of the acid dissociation constant for a metal-to-ligand charge transfer state of a ruthenium(II) complex

A Spin-Free Square Planar Cobaltous Complex