Photocatalysed decolouration of indigo in solution via in situ generation of an organic hydroperoxide

Abstract

Indigo, a famous and well-loved dye, is highly resistant towards photobleaching but can be broken down to the colourless isatin under photocatalytic conditions.

Discovery and properties of a new indigoid structure type based on dimeric cis-indigos

“…Its exceptional resistance towards light, air and water are attractive for utilization of this cheap, readily available dye in organic electronic applications. Indigo slowly reacts with ozone and hydroxyl radicals to decompose into isatin and anthranilic acid 50,51 , however, both compounds are non-toxic and exist in nature.…”