Temperature dependence of the electron spin resonance spectra of a coal-derived vacuum distillation residue and components

Castellano, S.; Chisholm, William P.; Sprecher, Richard F.; Retcofsky, H. L.

doi:10.1021/ac00140a030

Cited by 3 publications

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“…As seen in Figures and , linear fits (as required by the Curie Law) were found for the data plotted as I as a function of 1/ T for all of the samples studied. These data were obtained over a temperature range of greater than 200 K. These Curie Law plots do show small, nonzero intercepts, but Castellano has demonstrated that these intercepts tend to act as a sink for the systematic errors in measurement in variable-temperature EPR studies …”

Section: Discussionmentioning

confidence: 99%

“…These data were obtained over a temperature range of greater than 200 K. These Curie Law plots do show small, nonzero intercepts, but Castellano has demonstrated that these intercepts tend to act as a sink for the systematic errors in measurement in variable-temperature EPR studies. 39 Failure to account for this problem could lead one to misinterpret these intercepts as evidence for non-Curie Law behavior.…”

Section: Discussionmentioning

confidence: 99%

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Variable-Temperature EPR Studies of Illinois No. 6 Coal Treated with Donor and Acceptor Molecules

Thompson

Rothenberger

Retcofsky³

1997

Energy Fuels

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Variable-temperature EPR studies of Illinois No. 6 coal, its pyridine extract, and samples of each after treatment with known donor and acceptor molecules are reported. The purpose of the study was to explore the origin of the EPR signals near g ) 2 and to elucidate the nature of noncovalently bonded interactions in coal. Curie Law behavior is exhibited for each sample, indicating that the EPR signals are dominated by doublet state species. No evidence for thermally accessible, low-lying triplet states, such as those found in some charge-transfer complexes, was found. Infrared spectroscopy suggests, however, that electron transfer from the coal does occur after treatment with electron acceptors such as TCNQ and TCNE. EPR studies of the Illinois No. 6 coal samples after treatment with the known electron donor TTF revealed the formation of the TTF radical cation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%