The chemistry of vitrinite fluorescence |
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| Institution: | 1. Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada;2. Ryerson University, Toronto, ON M5B 2K3, Canada;3. McMaster University, Hamilton, ON L8N 4A6, Canada;4. Department of Psychology, University of Toronto, Toronto, ON, Canada;5. Nutritional Sciences, University of Toronto, Hospital for Sick Children, Toronto, ON, Canada;6. Department of Psychology, Université du Québec à Montréal, Montréal, QC H3C 3P8, Canada;7. Department of Psychiatry and Neurology, McGill University, Douglas Mental Health University Institute, Montreal, QC H4H 1R3, Canada;8. Universidade Federal do Rio Grande do Sul, Brazil;9. Centre for Addition and Mental Health (CAMH), Toronto, ON M6J 1H4, Canada;10. Departments of Physiology, Obstetrics and Gynecology, and Medicine, University of Toronto, Toronto, ON, Canada |
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| Abstract: | The presence of a mobile phase within the structure of vitrinite is responsible for a major part of the maceral's secondary fluroescence. Fluorophoric structures contained in the mobile phase include aromatics, polars and a small proportion of aliphatics. The development of the mobile phase in the bituminous range of coalification enhances vitrinite secondary fluorescence and coal thermoplasticity. The macromolecular network is shown to be too condensed to display visible fluorescence as a result of self-quenching and π-electron delocalization.Dry catalytic hydrogenation has enabled the structure of coal to be related to the fluorescence displayed by the hydrogenated vitrinite. The hydrogenation-induced fluorescence and yield of chloroform-soluble material were progressively enhanced by hydrogenation; however, the residual aromatic network displays no visible fluorescence. |
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