en
Scientific article
Open access
English

Ruthenium(II) Coordination Chemistry of a Fused Donor-Acceptor Ligand: Synthesis, Characterization and Photoinduced Electron Transfer Reactions of [{Ru(bpy)2}n(TTF-ppb)](PF6)2n (n = 1, 2)

Published inInorganic chemistry, vol. 47, no. 23, p. 11010-11017
Publication date2008
Abstract

A π-extended, redox-active bridging ligand 4´,5´-bis(propylthio)tetrathiafulvenyl[i]dipyrido[2,3-a:3´,2´-c]phenazine (L) was prepared via direct Schiff-base condensation of the corresponding diamine-tetrathiafulvalene (TTF) precursor with 4,7-phenanthroline-5,6-dione. Reactions of L with [Ru(bpy)2Cl2] afforded its stable mono- and dinuclear ruthenium(II) complexes 1 and 2. They have been fully characterized, and their photophysical and electrochemical properties are reported together with those of [Ru(bpy)2(ppb)]2+ and [Ru(bpy)2(μ-ppb)Ru(bpy)2]4+ (ppb = dipyrido[2,3-a:3´,2´-c]phenazine) for comparison. In all cases, the first excited state corresponds to an intramolecular TTF → ppb charge-transfer state. Both ruthenium(II) complexes show two strong and well-separated metal-to-ligand charge-transfer (MLCT) absorption bands, whereas the 3MLCT luminescence is strongly quenched via electron transfer from the TTF subunit. Clearly, the transient absorption spectra illustrate the role of the TTF fragment as an electron donor, which induces a triplet intraligand charge-transfer state (3ILCT) with lifetimes of approximately 200 and 50 ns for mono- and dinuclear ruthenium(II) complexes, respectively.

Research group
Citation (ISO format)
GOZE, C. et al. Ruthenium(II) Coordination Chemistry of a Fused Donor-Acceptor Ligand: Synthesis, Characterization and Photoinduced Electron Transfer Reactions of [{Ru(bpy)2}n(TTF-ppb)](PF6)2n (n = 1, 2). In: Inorganic chemistry, 2008, vol. 47, n° 23, p. 11010–11017. doi: 10.1021/ic801252t
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal1939-5175
735views
423downloads

Technical informations

Creation10/02/2009 3:18:14 PM
First validation10/02/2009 3:18:14 PM
Update time03/14/2023 3:15:23 PM
Status update03/14/2023 3:15:22 PM
Last indexation01/15/2024 7:02:55 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack