# The serendipitous discovery of luminescent and liquid crystalline and photoconductive triphenoxazoles

O'Callaghan, Gregory Calum (2017). The serendipitous discovery of luminescent and liquid crystalline and photoconductive triphenoxazoles. University of Birmingham. Ph.D.

## Abstract

Triphenylene has been shown to possess interesting luminescent properties, such as a large pseudo Stokes shift and an excellent molar absorptivity coefficient.

The research described in this thesis aims to focus on the serendipitous discovery of the incorporation of an oxazole moiety to the triphenylene core of alkoxytriphenylenes , and the study of the properties of this new class of material - triphenoxazole s- which show them to be highly luminescent, photoconducting and liquid crystalline .
The thesis mainly focuses upon two series of alkoxytriphenoxazoles.

1) where the effects of incorporating $$ortho$$, $$meta$$ and $$para$$ fluorophenyl as the oxazole R group of the triphenoxazole derivatives. Where it is shown that a change in position of the fluorine leads to significant alterations in the fluorescent and liquid crystal properties.
2) The effects of increasing the aromatic area of the oxazole R group from phenyl to anthracyl. Whereby fluorescence is significantly red shifted and the Col$$_h$$ mesophase is extended to > 100 °C. Furthermore , initial photoconductivity tests showed the triphenoxazole to be significantly more photoconductive than the alkoxy parent compound.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Preece, Jon AndrewUNSPECIFIEDUNSPECIFIED
Robinson, Alex P. G.UNSPECIFIEDUNSPECIFIED