DOI: 10.1135/cccc20010307. Syntheses, Spectroelectrochemistry and Photoinduced Electron-Transfer Processes of Novel Ru and Os Dyad and Triad Complexes with Functionalized Diimide Ligands

Syntheses, Spectroelectrochemistry and Photoinduced Electron-Transfer Processes of Novel Ru and Os Dyad and Triad Complexes with Functionalized Diimide Ligands

10.1135/cccc20010307

Crossref journal-article

Institute of Organic Chemistry & Biochemistry

Collection of Czechoslovak Chemical Communications (111)

Abstract

A series of mono- and dinuclear Ru complexes containing a bridging ligand, L-diimide-L (L = 2-(2-pyridyl)benzimidazole; diimide = benzene-1,2:4,5-bis(dicarboximide) (bdi; pyromellitimide) or naphthalene-1,8:4,5-bis(dicarboximide) (ndi), with either propane or xylene group as linkers, have been prepared. The mono- and dinuclear Ru complexes containing the bdi or ndi ligand, exhibit characteristic metal-to-ligand charge transfer (MLCT) transition at 458 nm. The mono- and dinuclear Ru/Os complexes exhibit a rich redox chemistry arising from both M(II) to M(III) oxidation and ligand-based consecutive reduction of diimide and 2,2'-bipyridine (bpy) ligands. The emission decays fit well with double- or triple-exponential decay models. The non-exponential decay curve reveals the existence of several conformers in solution due to the flexible propane or p-xylene linker. The much shorter emission lifetimes of the [M(bpy)2(L-diimide-L)] complexes compared with the parent [M(bpy)2L] indicates the intramolecular electron-transfer from the excited M(bpy)2 moiety to the diimide. The fastest rates of electron transfer (3 · 1010 s-1) are attributable to the folded conformers suitable for the electron donor/acceptor through-space interaction. A time-resolved absorption spectroscopic study of the dinuclear bdi and ndi complexes revealed appearance of the electron-transfer products, M(III) and the diimide radical anion, and their rapid disappearance. The effect of the linkers of the ligand L-diimide-L on the rates of electron transfer and the back electron transfer is also discussed.

Bibliography

Hossain, M. D., Haga, M., Gholamkhass, B., Nozaki, K., Tsushima, M., Ikeda, N., & Ohno, T. (2001). Syntheses, Spectroelectrochemistry and Photoinduced Electron-Transfer Processes of Novel Ru and Os Dyad and Triad Complexes with Functionalized Diimide Ligands. Collection of Czechoslovak Chemical Communications, 66(2), 307â337.

Authors 7

M. Delower Hossain (first)
Masa-aki Haga (additional)
Bobak Gholamkhass (additional)
Koichi Nozaki (additional)
Minoru Tsushima (additional)
Noriaki Ikeda (additional)
Takeshi Ohno (additional)

References 44 Referenced 16

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Dates

Type	When
Created	23 years, 1 month ago (July 27, 2002, 5:01 a.m.)
Deposited	6 years, 11 months ago (Sept. 9, 2018, 9:53 a.m.)
Indexed	1 year, 3 months ago (May 7, 2024, 10:09 p.m.)
Issued	24 years, 7 months ago (Jan. 1, 2001)
Published	24 years, 7 months ago (Jan. 1, 2001)
Published Online	24 years, 7 months ago (Jan. 1, 2001)
Published Print	24 years, 7 months ago (Jan. 1, 2001)

Funders 0

None

BibTeX

@article{Hossain_2001, title={Syntheses, Spectroelectrochemistry and Photoinduced Electron-Transfer Processes of Novel Ru and Os Dyad and Triad Complexes with Functionalized Diimide Ligands}, volume={66}, ISSN={1212-6950}, url={http://dx.doi.org/10.1135/cccc20010307}, DOI={10.1135/cccc20010307}, number={2}, journal={Collection of Czechoslovak Chemical Communications}, publisher={Institute of Organic Chemistry & Biochemistry}, author={Hossain, M. Delower and Haga, Masa-aki and Gholamkhass, Bobak and Nozaki, Koichi and Tsushima, Minoru and Ikeda, Noriaki and Ohno, Takeshi}, year={2001}, pages={307–337} }

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