Issue 43, 2006
From the journal:

Physical Chemistry Chemical Physics

Photoexcited triplets of dyes in zeolitic nanostructured channels. A time resolved EPR study†

Antonio Barbon,a   Marco Bellinazzi,a   Manuela Casagrande,a   Loretta Storaro,b   Maurizio Lenardab  and  Marina Brustolona  

a INSTM (UdR diPadova) and Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, Padova, Italy
E-mail: marinarosa.brustolon@unipd.it
Fax: +390498275135
Tel: +390498275680

b INSTM (UdR di Venezia) and Dipartimento di Chimica, Università degli Studi di Venezia, via Torino 155/B, Mestre (VE), Italy
Fax: +390412346735
Tel: +390412346762

Abstract

Two dyes (4-nitrostilbene, NST and 4-N,N-dimethylamino-4′-nitrostilbene, DANS) included in zeolites with nanometric channels and different Si : Al ratios have been photoexcited and their triplet state studied by time resolved EPR (TR-EPR). This is the first time that a TR-EPR spectrum of photoexcited triplet states of dyes in zeolites has been observed. The zeolites used were ZSM-5 and mordenite, with either protons or lithium as charge compensating ions, and the aluminium-free porosil. The ZFS parameters and the polarized spin populations have been obtained, and compared with those obtained in glassy solutions and in the organic nanostructured matrix perhydrotriphenylene (PHTP). For 3DANS in neutral solvents and in PHTP the dimethylamino group is π conjugated, whereas only its acid form is detected in all the zeolites. In the latter the spectra of the radical cations formed by spontaneous oxidation have also been observed both by cw-EPR and TR-EPR, the last spectra being spin polarized in emission. The mobility of the triplets is discussed, taking into account the spin polarization of the radical cations indicating a strong radical–triplet interaction.

Graphical abstract: Photoexcited triplets of dyes in zeolitic nanostructured channels. A time resolved EPR study

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Article information

DOI
https://doi.org/10.1039/B610937N
Article type
Paper
Submitted
28 Jul 2006
Accepted
14 Sep 2006
First published
25 Sep 2006

Phys. Chem. Chem. Phys., 2006,8, 5069-5078

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Photoexcited triplets of dyes in zeolitic nanostructured channels. A time resolved EPR study

A. Barbon, M. Bellinazzi, M. Casagrande, L. Storaro, M. Lenarda and M. Brustolon, Phys. Chem. Chem. Phys., 2006, 8, 5069 DOI: 10.1039/B610937N

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