UNSPECIFIED. (2002) Anodic oxidation of the dye materials methylene blue, acid blue 25, reactive blue 2 and reactive blue 15 and the characterisation of novel intermediate compounds in the anodic oxidation of methylene blue. JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, 77 (7). pp. 756-760. ISSN 0268-2575

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Abstract

Anodic oxidation of the dye molecules, methylene blue, acid blue 25, reactive blue 2 and reactive blue 15 in chloride solution leads to colour destruction but UV and TOC data show that the oxidation reactions do not lead to complete destruction of the organic molecules. Analysis of the anodic oxidation products of [3,7-bis (dimethylamino) phenothiazinium] chloride (methylene blue) in a chloride solution provides evidence for formation of seven neutral and two charged intermediates. The main intermediate is identified by its X-ray diffraction crystal structure and accurate mass spectrometry as the novel leuco dye 4,6-dichloro-7-dimethylamino-3H-phenothiazin-3-one, C14H10C12N2OS (I) formed by replacement of one of the dimethylamino groups of methylene blue with oxygen accompanied by regiospecific chlorination of the carbocyclic systems. The mass spectra of other intermediates formed are interpreted in terms of the structure of I. (C) 2002 Society of Chemical Industry.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology Q Science > QD Chemistry
Journal or Publication Title:	JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Publisher:	JOHN WILEY & SONS LTD
ISSN:	0268-2575
Date:	July 2002
Volume:	77
Number:	7
Number of Pages:	5
Page Range:	pp. 756-760
Identification Number:	10.1002/jctb.642
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10843

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