E.s.r. study of electron acceptor doped coals

Non-covalent bond interactions play important roles in coal structure. They serve as virtual crosslinks which help to hold the network together. This paper concentrates, particularly, on the structure of coal with respect to charge transfer interaction between coal and electron acceptors. Iodine and...

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Bibliographic Details
Published in:Fuel (Guildford) 1994-06, Vol.73 (6), p.840-842
Main Authors: Sanada, Yuzo, Kumagai, Haruo, Sasaki, Masahide
Format: Article
Language:English
Subjects:
Applied sciences
coal
Coal and derived products
Energy
Exact sciences and technology
Fuels
reactivity
structure
Structure, chemical and physical properties
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Summary:Non-covalent bond interactions play important roles in coal structure. They serve as virtual crosslinks which help to hold the network together. This paper concentrates, particularly, on the structure of coal with respect to charge transfer interaction between coal and electron acceptors. Iodine and tetracyanoquinodimethane (TCNQ) as electron acceptors interact with coal molecules producing charge transfer complexes. A good correlation is obtained between the spin concentration, N s , of coal-iodine complexes and the Bloch decay value (carbon aromaticity, ƒ a ) of parent coal. The N s value increases with the increase of aromaticity in coal. On the other hand, TCNQ is a molecule with strong electron accepting ability, as is iodine. The N s value for TCNQ doped coal increases with decreasing coal rank. Interpretation of the above fact is that the TCNQ molecule moves to sites associated with oxygen containing functional groups, which are able to form hydrogen bonds.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(94)90277-1