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Article: Spectroscopic and Electrochemical Properties of Catenanes Containing the 2,7-Diazapyrenium Unit
Title | Spectroscopic and Electrochemical Properties of Catenanes Containing the 2,7-Diazapyrenium Unit |
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Authors | |
Keywords | Catenanes Charge-transfer Electrochemistry Photochemistry |
Issue Date | 2001 |
Citation | Supramolecular Chemistry, 2001, v. 13, n. 2, p. 303-311 How to Cite? |
Abstract | The spectroscopic and electrochemical properties of two cyclophanes containing one and, respectively, two 2,7-diazapyrenium electron-acceptor units, and of their [2]catenanes with macrocycles containing two dioxybenzene or dioxynaphthalene electron-donor units have been investigated. The absorption spectra of the catenanes show weak and broad bands in the visible region, assigned to charge-transfer (CT) interactions. The very strong and structured fluorescence (298K) and the structured fluorescence and phosphorescence (77K) of the diazapyrenium unit are maintained in the two cyclophanes, but they are no longer present in the [2]catenanes, presumably because of a quenching process caused by the lower energy CT excited states. Each diazapyrenium unit undergoes two distinct reduction processes - only the first one of which is fully reversible - that are hardly affected at all when the diazapyrenium units are incorporated in a cyclophane. In the [2]catenanes, the CT interaction displaces the reduction processes of the diazapyrenium units toward more negative potentials. The results obtained for the diazapyrenium and previously investigated 4,4′-bipyridinium salts, selected cyclophane derivatives, and some [2]catenanes obtained by interlocking the cyclophanes with macrocycles containing two dioxyaromatic electron-donor units are compared and discussed. |
Persistent Identifier | http://hdl.handle.net/10722/333660 |
ISSN | 2023 Impact Factor: 2.1 2023 SCImago Journal Rankings: 0.257 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Balzani, Vincenzo | - |
dc.contributor.author | Credi, Alberto | - |
dc.contributor.author | Langford, Steven J. | - |
dc.contributor.author | Prodi, Anna | - |
dc.contributor.author | Stoddart, J. Fraser | - |
dc.contributor.author | Venturi, Margherita | - |
dc.date.accessioned | 2023-10-06T05:21:23Z | - |
dc.date.available | 2023-10-06T05:21:23Z | - |
dc.date.issued | 2001 | - |
dc.identifier.citation | Supramolecular Chemistry, 2001, v. 13, n. 2, p. 303-311 | - |
dc.identifier.issn | 1061-0278 | - |
dc.identifier.uri | http://hdl.handle.net/10722/333660 | - |
dc.description.abstract | The spectroscopic and electrochemical properties of two cyclophanes containing one and, respectively, two 2,7-diazapyrenium electron-acceptor units, and of their [2]catenanes with macrocycles containing two dioxybenzene or dioxynaphthalene electron-donor units have been investigated. The absorption spectra of the catenanes show weak and broad bands in the visible region, assigned to charge-transfer (CT) interactions. The very strong and structured fluorescence (298K) and the structured fluorescence and phosphorescence (77K) of the diazapyrenium unit are maintained in the two cyclophanes, but they are no longer present in the [2]catenanes, presumably because of a quenching process caused by the lower energy CT excited states. Each diazapyrenium unit undergoes two distinct reduction processes - only the first one of which is fully reversible - that are hardly affected at all when the diazapyrenium units are incorporated in a cyclophane. In the [2]catenanes, the CT interaction displaces the reduction processes of the diazapyrenium units toward more negative potentials. The results obtained for the diazapyrenium and previously investigated 4,4′-bipyridinium salts, selected cyclophane derivatives, and some [2]catenanes obtained by interlocking the cyclophanes with macrocycles containing two dioxyaromatic electron-donor units are compared and discussed. | - |
dc.language | eng | - |
dc.relation.ispartof | Supramolecular Chemistry | - |
dc.subject | Catenanes | - |
dc.subject | Charge-transfer | - |
dc.subject | Electrochemistry | - |
dc.subject | Photochemistry | - |
dc.title | Spectroscopic and Electrochemical Properties of Catenanes Containing the 2,7-Diazapyrenium Unit | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1080/10610270108027485 | - |
dc.identifier.scopus | eid_2-s2.0-0035566761 | - |
dc.identifier.volume | 13 | - |
dc.identifier.issue | 2 | - |
dc.identifier.spage | 303 | - |
dc.identifier.epage | 311 | - |
dc.identifier.isi | WOS:000170136000006 | - |