Electrochemical and Spectroscopic Properties of Cyclometallated and Non-Cyclometallated Ruthenium(II) Complexes Containing Sterically Hindering Ligands of the Phenanthroline and Terpyridine Families

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

“…Consequently, Ru(phbpy)(ttpy) + is luminescent in room temperature fluid solution and displays a lifetime of 60 ns [181], despite the expectation that, according to the energy gap law, the lower 3 MLCT energy should have enhanced nonradiative relaxation. Since the 3 MLCT state lifetimes of the Ru(NNN)(NNC) + complexes are the result of competing processes (direct nonradiative relaxation and the activated decay through the 3 MC state), optimizing these lifetimes requires balancing the effects on both processes [181,182].…”

Ruthenium Complexes as Sensitizers in Dye-Sensitized Solar Cells

“…After the first report on cyclometalated ruthenium complexes of [Ru(bpy) 2+ (ppy)] 1+ type (where ppyH = 2-phenylpyridine) by Reveco et al [87][88][89] and by Constable with Holmes [90], these complexes attracted a great attention in regards their photophysical characteristics [91][92][93][94][95][96][97]. However, only in 2007 Wadman et al reported on the potential of cyclometalated Ru(II) complexes for DSC application [98].…”

Synthesis of rodlike ruthenium(II) coordination polymers having metal-nitrogen and metal-carbon bonds in their main chains

“…Above λ ≈ 380 nm, absorptions are observed which can be assigned to the metal-toligand charge-transfer (MLCT) transitions [40,50,51]. A very broad absorption is found in spectra C -E at λ ≈ 530 nm which is interpreted as MLCT transition involving the LUMO (lowest unoccupied molecular orbital) of the pyridine-based ligands.…”

“…However, it is of interest to also make these polymers B available because (i) they should show electronic and optical properties quite different from those of polymers A, (ii) their chains should have a more pronounced covalent character and should be even more stable than chains A, and (iii) they have a lower or even vanishing ionic charge density, giving rise to clearly different properties in bulk and solution compared to systems like A. Recently, Constable, Sauvage and others developed synthetic methods which open up access to low-molecular-weight octahedral ruthenium(II)-polyimine complexes in which one carbon atom acts as a ligand in addition to five nitrogen atoms [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. Provided it is possible to increase the efficiency of the complex-formation processes, it should be possible to also take advantage of these procedures for the successful preparation of multinuclear and thus polymeric coordination compounds.…”