Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System
The synthesis, electrochemical and photophysical properties of a branched molecule 3,5-bis(pyrene-1-yl)-4'-phenyl-2,2':6',2''-terpyridine are reported. Spectroscopy in different solvents reveals that an optical electron transfer from the pyrene donor to the terpyridyl electr...
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| Format: | Article |
| Language: | English |
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MDPI AG
2009-05-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/9/5/3604/ |
| _version_ | 1811184803043606528 |
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| author | Luisa De Cola Elio Cecchetto Anthony D’Aléo René M. Williams |
| author_facet | Luisa De Cola Elio Cecchetto Anthony D’Aléo René M. Williams |
| author_sort | Luisa De Cola |
| collection | DOAJ |
| description | The synthesis, electrochemical and photophysical properties of a branched molecule 3,5-bis(pyrene-1-yl)-4'-phenyl-2,2':6',2''-terpyridine are reported. Spectroscopy in different solvents reveals that an optical electron transfer from the pyrene donor to the terpyridyl electron acceptor can occur in polar media, as the system displays both charge transfer (CT) absorption and CT emission. Furthermore, the study of the zinc complex as well as the bis-protonated form shows an enhancement of the electron transfer character of the system, by an increase of the acceptor strength. This is accompanied by a large increase of the non-radiative processes. With sub-nanosecond transient absorption spectroscopy, the CT state, consisting of the pyrene radical cation and the terpyridine radical anion, has been detected. At room temperature, the study of the nanosecond transient absorption spectra reveals the formation of a low-lying triplet excited state that we attribute to the pyrene moiety through which the CT state decays. At 77K, the absence of the terpyridine triplet emission also suggests the population of a low-lying triplet state of the pyrene unit. |
| first_indexed | 2024-04-11T13:18:39Z |
| format | Article |
| id | doaj.art-ebca2c7d871649818484e09b4af970ef |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:18:39Z |
| publishDate | 2009-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-ebca2c7d871649818484e09b4af970ef2022-12-22T04:22:19ZengMDPI AGSensors1424-82202009-05-01953604362610.3390/s90503604Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene SystemLuisa De ColaElio CecchettoAnthony D’AléoRené M. WilliamsThe synthesis, electrochemical and photophysical properties of a branched molecule 3,5-bis(pyrene-1-yl)-4'-phenyl-2,2':6',2''-terpyridine are reported. Spectroscopy in different solvents reveals that an optical electron transfer from the pyrene donor to the terpyridyl electron acceptor can occur in polar media, as the system displays both charge transfer (CT) absorption and CT emission. Furthermore, the study of the zinc complex as well as the bis-protonated form shows an enhancement of the electron transfer character of the system, by an increase of the acceptor strength. This is accompanied by a large increase of the non-radiative processes. With sub-nanosecond transient absorption spectroscopy, the CT state, consisting of the pyrene radical cation and the terpyridine radical anion, has been detected. At room temperature, the study of the nanosecond transient absorption spectra reveals the formation of a low-lying triplet excited state that we attribute to the pyrene moiety through which the CT state decays. At 77K, the absence of the terpyridine triplet emission also suggests the population of a low-lying triplet state of the pyrene unit.http://www.mdpi.com/1424-8220/9/5/3604/branched moleculesspectroscopyion complexationexcited state absorptionemissionmolecular polarity sensor |
| spellingShingle | Luisa De Cola Elio Cecchetto Anthony D’Aléo René M. Williams Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System Sensors branched molecules spectroscopy ion complexation excited state absorption emission molecular polarity sensor |
| title | Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System |
| title_full | Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System |
| title_fullStr | Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System |
| title_full_unstemmed | Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System |
| title_short | Metal Ion Enhanced Charge Transfer in a Terpyridine-bis-Pyrene System |
| title_sort | metal ion enhanced charge transfer in a terpyridine bis pyrene system |
| topic | branched molecules spectroscopy ion complexation excited state absorption emission molecular polarity sensor |
| url | http://www.mdpi.com/1424-8220/9/5/3604/ |
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