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Singlet oxygen sensitisation in supercritical fluids

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thesis
posted on 24.07.2018, 15:36 by Manisha Patel
Supercritical fluids have been the subject of much recent interest as solvents in which to study fundamental photochemical reactions, since they allow, through changes in pressure and temperature, changes in a number of solvent parameters without changing chemical identity. As a result it is possible to control or tune a reaction by adjusting temperature and/or pressure. Ground state molecular oxygen (3Σg-) is a potent quencher of electronically excited states of molecules. Transient absorption of triplet benzophenone (3BP) has been studied as a function of temperature and pressure, to investigate the reactivity of triplet benzophenone toward molecular oxygen, in supercritical carbon dioxide. The spin statistical factors suggests a maximum of 4/9 possible pathways result in quenching for two triplets, proceeding either via energy transfer to molecular oxygen (1/9) or via intersystem crossing to the ground state (3/9). [Continues.]

Funding

EPSRC.

History

School

  • Science

Department

  • Chemistry

Publisher

© Manisha Patel

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2005

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.

Language

en

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