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Terthiophene appended with terpyridine units as receptors for protons and Zn2+ ions: photoinduced energy and electron transfer processes

Bergamini, Giacomo and Boselli, Luca and Ceroni, Paola and Manca, Paola and Sanna, Gavino and Pilo, Maria Itria (2011) Terthiophene appended with terpyridine units as receptors for protons and Zn2+ ions: photoinduced energy and electron transfer processes. European Journal of Inorganic Chemistry, Vol. 2011 (29), p. 4590-4595. eISSN 1099-0682. Article.

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DOI: 10.1002/ejic.201100582

Abstract

Two ligands consisting of 2,2':6',2''-terpyridine (tpy) and terthiophene units (3T) connected by a methyleneoxy (TTT) or an alkynyl bridge (TAT) show different photophysical properties: in the former there is no evidence of a ground state interaction between the two constituent chromophores and the expected 3T emission is observed. On the other hand, the latter exhibits strong π-conjugation between the two chromophores mediated by the alkynyl bridge: this results in a substantially redshifted absorption and an emission displaced toward the red with a decreased quantum yield. Both of these ligands can be diprotonated: protonation occurs at the tpy unit in two successive steps, leading finally to TTT·2H+ and TAT·2H+. In both cases, strong changes in the absorption spectra and very efficient quenching of the luminescence takes place by a photoinduced electron transfer from 3T to the protonated tpy unit. Both TTT and TAT can also perform as Zn2+ ligands, giving rise to complexes with 1:2 metal/ligand stoichiometry in acetonitrile solution, as demonstrated by changes in the photophysical properties. Also in this case, the resulting complex is not luminescent because of photoinduced electron transfer from 3T to the [Zn(tpy)2]2+ moieties.

Item Type:Article
ID Code:6919
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zinc(II) complexes, luminescence, oligothiophenes, electrochemistry
Subjects:Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Wiley
eISSN:1099-0682
Deposited On:03 Jan 2012 09:28

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