Issue 7, 2012

Chelation ability of spironaphthoxazine with metal ions in silica gel

Abstract

Spironaphthoxazine (SNO) and three metal ions, Mg2+, Zn2+, and Al3+, were dispersed in silica gels by the sol–gel method. The chelation ability of SNO with the metal ions in silica gels was investigated by measuring the fluorescence spectra and was compared to that of 8-hydroxyquinoline (8-HQ) in ethanol and silica gels. A merocyanine-type isomer photoderived from SNO as well as 8-HQ easily formed complexes of the metal ions in the order of Al3+, Zn2+, and Mg2+ because the coordination ability of the metal ions to such ligands depended on their electron affinity. The changes in the fluorescence spectra of the silica gel samples during light irradiation were also investigated. The relative band intensity due to the intermediate species between the original SNO and the merocyanine species decreased and that of the complex increased with the UV irradiation time. The reverse process was observed during visible irradiation. The UV irradiation effects on the chelation of SNO and its photochromic property also depended on the electron affinity of the metal ions.

Graphical abstract: Chelation ability of spironaphthoxazine with metal ions in silica gel

Supplementary files

Article information

Article type
Paper
Submitted
12 Oct 2011
Accepted
16 Feb 2012
First published
12 Mar 2012

Photochem. Photobiol. Sci., 2012,11, 1164-1173

Chelation ability of spironaphthoxazine with metal ions in silica gel

H. Nishikiori, K. Teshima and T. Fujii, Photochem. Photobiol. Sci., 2012, 11, 1164 DOI: 10.1039/C2PP05345D

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.

Spotlight

Advertisements