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

Artificial Molecular Rotors

Nucleic acid mediated electron transfer

Four Zn(II)-tetra(carboxyphenyl)porphyrins in solution and bound to metal oxide (TiO2, ZnO, and ZrO2) nanoparticle films were studied to determine the effect of the spacer length and anchoring grou ...

https://www.chem.ccu.edu.tw/~joyce/seminar/96_I/J.%20Am.%20Chem.%20Soc.%202007,%20129,%204655%20-4665.pdf

Tetrachelate Porphyrin Chromophores for Metal Oxide Semiconductor Sensitization: Effect of the Spacer Length and Anchoring Group Position

The ruthenium (II) complex [Ru(bipy)2(dppz)]2+(bipy = 2,2′-bipyridine, dppz = dipyrido[3,2-a : 2′,3′-c]phenazine) was synthesized, characterized, and studied. Its oxidation and first reduction potentials are respectively 1.24 and –1.02 V (vs. saturated calomel electrode). The maxima of the metal-to-ligand charge-transfer absorption and emission occur respectively at 448 and 610 nm. These data suggest that [Ru(bipy)2(dppz)]2+ is made up of two electronically independent units, one behaving as a [Ru(bipy)3]2+-like chromophore, the other as a phenazine-like electron acceptor. Excited-state absorption spectra were obtained for [Ru(bipy)2(dppz)]2+ and its parent complex [Ru(bipy)3]2+. Above 500 nm the latter shows only one maximum (at 510 nm), and the former shows two maxima (around 526 and 557 nm), whereas radical anions of both bipyridine and phenazine or dipyridophenazine show two maxima (at 512 and 552 nm for phenazine). In the case of [Ru(bipy)2(dppz)]2+ these results can be interpreted in terms of a light-induced directed charge transfer from the ruthenium to the phenazine part of the dipyridophenazine ligand, and its localization on this ligand moiety. Photochemical properties of [Ru(bipy)2(dppz)]2+ were studied in ethanol. The excited state of the complex is quenched both by an electron acceptor (methylviologen, kq= 1.37 × 109 dm3 mol–1 s–1) and an electron donor (triethanolamine, kq= 4.40 × 107 dm3 mol–1s–1).

Synthesis and study of a mixed-ligand ruthenium(II) complex in its ground and excited states: bis(2,2′-bipyridine)(dipyrido[3,2-a : 2′,3′-c]phenazine-N4N5)ruthenium(II)

Methode de preparation et etude des proprietes electrochimiques, spectroelectrochimiques et photophysiques des composes du titre

Electrochemistry, spectroelectrochemistry, and photochemistry of a series of new covalently linked tris(2,2'-bipyridine)ruthenium(II)/diquat complexes

Thermal and photo-induced atropisomerization of picket-fence porphyrins, metalloporphyrins, and diacids: a means for examining porphyrin solution properties

Ruth A. Freitag

Papers

Electrochemistry, spectroelectrochemistry, and photochemistry of a series of new covalently linked tris(2,2'-bipyridine)ruthenium(II)/diquat complexes

Thermal and photo-induced atropisomerization of picket-fence porphyrins, metalloporphyrins, and diacids: a means for examining porphyrin solution properties

Photoatropisomerization of "picket-fence" porphyrins and their metal complexes

Mechanistic Studies of Thermal and Photoinduced Atropisomerization of Substituted Tetraphenyl Porphyrins in Solution and Organized Assemblies