Journal article 331 views
Steady-State and Time-Resolved Investigations on Pyrene-Based Chemosensors
J. Fernández-Lodeiro,
C. Núñez,
C.S. De Castro,
E. Bértolo,
J.S. Seixas De Melo,
J.L. Capelo,
C. Lodeiro,
Catherine De Castro 
Inorganic Chemistry, Volume: 52, Issue: 1, Pages: 121 - 129
Swansea University Author:
Catherine De Castro
Full text not available from this repository: check for access using links below.
DOI (Published version): 10.1021/ic301365y
Abstract
Two novel fluorescent probes bearing a single (P) and two (a podand-like structure, L) pyrene units derived from 1,5-bis(2-aminophenoxy)-3-oxopentane have been synthesized and investigated in dioxane using UV–vis absorption, and steady-state and time-resolved (in a picosecond time scale) emission sp...
| Published in: | Inorganic Chemistry |
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| ISSN: | 0020-1669 1520-510X |
| Published: |
2013
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31931 |
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| Abstract: |
Two novel fluorescent probes bearing a single (P) and two (a podand-like structure, L) pyrene units derived from 1,5-bis(2-aminophenoxy)-3-oxopentane have been synthesized and investigated in dioxane using UV–vis absorption, and steady-state and time-resolved (in a picosecond time scale) emission spectroscopy; in the gas phase, matrix-assisted laser desorption ionization mass spectrometry was employed. In dioxane, the absorption and emission spectra of P present a unique band with maxima at 361 and 392 nm, which have been associated with the monomer absorption and emission bands, respectively. In dioxane, for compound L, an additional band with a maximum at ∼525 nm is observed; upon the addition of water, an emissive band (with maxima varying from 405 to 490 nm) appears in both P and L spectra; this is discussed in terms of the emission of a species with charge character. Upon metal addition (Cu2+, Zn2+, and Ag+) to P, a gradual quenching effect of the monomer emission is observed and found to be more pronounced with Cu2+. In the case of L, upon the addition of metal cations, the long emission band (∼550 nm) decreases and the monomer emission band increases (with an isoemissive point at ∼450 nm) and no evidence for the intermediate band (at ∼405–490 nm) now exists. Time-resolved data in dioxane/water mixtures showed that for P and L these two fit double- and triple-exponential decay laws, respectively. With P, this has been attributed to a two-state system, which involves the monomer and a charged species, with its emission maxima varying with the polarity of the media (here mirrored by its dielectric constant), which can potentially be addressed to an exciplex-like species, whereas with L, it has been attributed to a three-state system involving, in addition to these two species, an excimer. From absorption and fluorescence excitation and time-resolved data, evidence is given for the presence of intramolecular dimer formation in the ground state. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
1 |
| Start Page: |
121 |
| End Page: |
129 |