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Isolated Supramolecular [Ru(bpy)(3)]-Viologen-[Ru(bpy)(3)] Complexes with Trapped CB[7,8] and Photoinduced Electron-Transfer Study in Nonaqueous Solution
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.ORCID iD: 0000-0002-4521-2870
2011 (English)In: Chemistry - A European Journal, ISSN 0947-6539, Vol. 17, no 41, 11604-11612 p.Article in journal (Refereed) Published
Abstract [en]

The synthesis of two supramolecular diruthenium complexes, 1 subset of CB[7] and 1 subset of CB[8] (CB[n]=cucurbit[n]uril), which contain the respective host CB[7] and CB[8], were synthesized and isolated. In the case of host CB[8], the desired supramolecular complex was obtained by utilizing dihydroxynapthalene as a template during the synthesis. The (1)H NMR spectra, electrochemistry, and photochemistry of these supramolecular complexes were performed in nonaqueous solution. The results show that both CB[7,8] hosts mainly bind to the linker part in solution in acetonitrile. This binding also lowers the oxidation potential of the ruthenium metal center and hinders the quenching effect by the viologen moiety. It has also been shown that external methylviologen can be included into 1 subset of CB[8]. Analysis with NMR spectroscopy, electrochemistry, and photochemistry clearly shows a viologen radical dimer formation between the bound viologen and free methylviologen, thereby showing that the unique abilities of the CB[8] host can be utilized even in nonaqueous solution.

Place, publisher, year, edition, pages
2011. Vol. 17, no 41, 11604-11612 p.
Keyword [en]
cucurbit[8]uril, electron transfer, ruthenium, supramolecular chemistry, viologen
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-24820DOI: 10.1002/chem.201002618ISI: 000297014400030Scopus ID: 2-s2.0-80053195331OAI: oai:DiVA.org:kth-24820DiVA: diva2:353459
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20100927. Uppdaterad från manuskript till artikel 20111212.Available from: 2010-09-27 Created: 2010-09-27 Last updated: 2011-12-12Bibliographically approved
In thesis
1. Supramolecular chemistry based on redox-active components and cucurbit[n]urils
Open this publication in new window or tab >>Supramolecular chemistry based on redox-active components and cucurbit[n]urils
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the host-guest chemistry between Cucurbit[7]uril (CB[7]) and CB[8] and a series of guests including bispyridinium cations, phenols and  napthalenes. These guests are bound to ruthenium polypyridine complexes or ruthenium based water oxidation catalysts (WOCs). The investigations are based upon utilizing the covalently linked photosensitizer and the electronic effects and chemical processes are investigated.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 59 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2010:38
Keyword
Cucurbit[n]uril, redox-active, viologen, light-driven, water oxidation, molecular motor
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-24730 (URN)978-91-7415-742-0 (ISBN)
Public defence
2010-10-15, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100927Available from: 2010-09-27 Created: 2010-09-24 Last updated: 2011-12-12Bibliographically approved

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