Metalloporphyrins in coal. 1. Gallium porphyrins in bituminous coals
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- p. 125-131
- https://doi.org/10.1039/p19840000125
Abstract
The isolation and characterisation of a homologous series of gallium polyalkylporphyrins from a large scale extraction of a bituminous coal (Daw Mill) from the Carboniferous is described. About 0.2 µg/g of metalloporphyrin fraction is obtained. The homologous series extends from C26 to C32. It is proposed that the homologues arise by fragmentation (thermal cracking, protodesubstitution on a mineral surface) of etioporphyrin III or its metal complexes during the coalification process. Evidence in support of this is provided by a survey of bituminous coals of increasing rank, where the predominating carbon number decreases in the range C30 to C26 as rank increases. The amount of metal-loporphyrins extracted also decreases with increasing rank : only traces are detected in anthracites.Keywords
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