Issue 27, 2009
From the journal:

Physical Chemistry Chemical Physics

Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports†‡

Bogdan Cojocaru,a   Ştefan Neaţu,a   Vasile I. Pârvulescu,*a   Karifala Dumbuya,b   Hans-Peter Steinrück,b   J. Michael Gottfried,b   Carmela Aprile,c   Hermenegildo Garcia*c  and  J. C. Scaiano*d  

* Corresponding authors

a University of Bucharest, Faculty of Chemistry, Department of Chemical Technology and Catalysis, Bd. Regina Elisabeta 4–12, Bucharest, Romania
E-mail: vasile.parvulescu@g.unibuc.ro
Fax: +40 (0)21 4100241
Tel: +40 (0)21 4100241

b Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, Erlangen, Germany
E-mail: michael.gottfried@chemie.uni-erlangen.de
Tel: +49 (0)91318527320

c Instituto de Tecnología Química CSIC-UPV, Universidad Politécnica de Valencia, Av. De los Naranjos s/n, Valencia, Spain
E-mail: hgarcia@qim.upv.es

d Department of Chemistry and Centre for Catalysis Research and Innovation, University of Ottawa, Ottawa, ON, Canada
E-mail: tito@photo.chem.uottawa.ca

Abstract

Different metallophthalocyanines and 2,4,6-triphenylpyrylium (TP+) ions were entrapped in different inorganic supports such as Y zeolite, mesoporous MCM-41, TiO2–SiO2 and SiO2 following a specific protocol. The resulting supramolecular structures were characterized by chemical analysis and diffuse reflectance UV–Vis measurements. The determination of the band gap on the basis of UV–Vis measurements showed that the host is not a spectator in this process and an electronic interaction occurs that lowers the band gap of the support. The XPS measurements were performed with an in situX-ray photoelectron spectrometer, which can be operated at pressures of up to 1 mbar at the sample. They indicated that the formation of the supramolecular structure generates a stable environment, in which the oxidation state of the metal can still be influenced by reaction of the metal center with gas molecules. The photocatalytic tests carried out in photodecomposition of dipropyl sulfide showed a good correlation between the band gap values and the photocatalytic activity for metallophthalocyanine complexes. It is remarkable that the triphenylpyrylium ion follows the same trend observed for metallophthalocyanines, although it is a different type of photosensitizer.

Graphical abstract: Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports

About
Cited by
Related
Download options Please wait...

Article information

DOI
https://doi.org/10.1039/B902348H
Article type
Paper
Submitted
05 Feb 2009
Accepted
27 Mar 2009
First published
30 Apr 2009

Phys. Chem. Chem. Phys., 2009,11, 5569-5577

Permissions

Request permissions

Band gap effect on the photocatalytic activity of supramolecular structures obtained by entrapping photosensitizers in different inorganic supports

B. Cojocaru, Ş. Neaţu, V. I. Pârvulescu, K. Dumbuya, H. Steinrück, J. Michael Gottfried, C. Aprile, H. Garcia and J. C. Scaiano, Phys. Chem. Chem. Phys., 2009, 11, 5569 DOI: 10.1039/B902348H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements