The photodegradation of azo dyes in solution and on cotton has been investigated. This
is a major problem, because of the widespread use of this class of dyes to dye cotton.
The photochemical pathways leading to photo degradation and the properties of the
excited states and photophysical deactivation processes were studied. Many of the
commercially used azo dyes are 1-aryl-2-naphthols with one or more azo groups which
undergo azo-hydrazone tautomerism. [Continues.]
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.