217-82-3Relevant academic research and scientific papers
Intervalence charge transfer in a "chain-like" ruthenium trinuclear assembly based on the bridging ligand 4,7-phenanthrolino-5,6: 5′,6′-pyrazine (ppz)
D'Alessandro, Deanna M.,Keene, F. Richard
, p. 1060 - 1072 (2006)
The IVCT characteristics of the mixed valence forms of the trinuclear complex [{Δ-Ru(bpy)2}2{Δt-Ru(bpy)(- ppz)2}]n+ (n = 7, 8; t = trans), and the diastereoisomers (meso and rac) of the dinuclear complex [{Ru(bpy)2} 2(-ppz)]5+, display a marked dependence on the nuclearity and extent of oxidation of the assemblies. The dinuclear species are classified as borderline localised-delocalised mixed valence species while the two mixed valence states of the trinuclear complex exhibit localised behaviour. One-electron oxidation of a terminal Ru centre in the trinuclear case gives rise to a broad, low intensity IVCT band for the +7 mixed valence species which is composed of two underlying Gaussian-shaped bands. The transitions are identified as adjacent and remote IVCT transitions, with the former dominating the intensity of the IVCT manifold. The +8 mixed valence species exhibits a single dominant IVCT band arising from the equivalent IVCT transitions from the central Ruii to peripheral Ruiii centres. The Royal Society of Chemistry 2006.
Spectroscopic and Electrochemical Properties of Dimeric Ruthenium(II) Diimine Complexes and Determination of Their Excited State Redox Properties
Fuchs, Yael,Lofters, Sonita,Dieter, Thomas,Shi, Wei,Morgan, Robert,et al.
, p. 2691 - 2697 (1987)
The complexes Ru(bpy)2(ppz)2+ and 4+, where ppz is the planar ligand 4',7'-phenanthrolino-5',6':5,6-pyrazine, have been prepared and characterized.Resonance Raman spectra establish that the visible spectra of Ru(bpy)2L2+ and 4+ complexes, where L is a bis-diimine, in general, are composed of MLCT transitions which terminate in the ?* orbitals localized on the different ligands.The luminescence, which is detectable at room temperature in fluid solutions of both the mono- and bimetallic complexes, can be assigned as a L(?*) - Ru(II) t2 transition.An approximate but general correlation between the lower energy MLCT absorption maximum and the emission maximum suggests that in many other bimetallic complexes of Ru(II) the emission energy is shifted beyond usual detection limits.Analysis of the emission and electrochemical data indicates that the MLCT states of bridged 2,3-dipyridylpyrazine (dpp) and ppz dimeric complexes are weak reductants but very strong oxidants.The implications of this general pattern of excited state redox potentials are discussed.
An improved preparation of 4,7-phenanthrolino-5,6:5′,6′-pyrazine
Imor, Susan,Morgan, Robert J.,Wang, Sihe,Morgan, Oma,Baker
, p. 2197 - 2203 (1996)
An overall three step preparation of the bis-diimine bridging ligand 4,7-phenanthrolino-5,6:5′,6′-pyrazine (ppz, 1) from 2-methoxy-l,4-phenylenediamine hydrosulfate 4 is reported.
Efficient synthesis of 1,4,5,12-tetraazatriphenylene and derivatives
Abeywickrama, Chandima,Baker, Arthur David
, p. 7741 - 7744 (2004)
Condensation of 5,6-diamino-4,7-phenanthroline with glyoxal provides 1,4,5,12-tetraazatriphenylene in quantitative yield. This procedure avoids the 50% loss of product inherent in previous methods. Derivatives were also prepared by using α-dicarbonyl comp
