Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents

H. Kumagai, K. Matuoka, K. Norinaga, T. Chiba, M. Sasaki

Research output: Contribution to journalArticle

Abstract

In order to evaluate noncovalent interactions in coal, change in the associated molecular structure of coals in pyridine/CS2 mixed solvents have been investigated. For bituminous coal, variation in L-band EPR spectra with mixing ratio of the solvents is in a close correspondence to that in equilibrium swelling ratio and in molecular mobility obtained from 1H-NMR. The EPR spectra for lignite show similar variation to that for bituminous coal, however, does not correlate with equilibrium swelling ratio and molecular mobility. Since the L-band EPR characteristics appear to reflect the situation of aromatic π-π and charge transfer interactions in coal, these results indicate that swelling in the mixed solvents proceed with the declining of non-covalent interaction, such as aromatic π-π and charge transfer interaction, in coal.

Original languageEnglish
Pages (from-to)289-291
Number of pages3
JournalUnknown Journal
Volume42
Issue number1
Publication statusPublished - 1997
Externally publishedYes

Fingerprint

Pyridine
Molecular structure
electron spin resonance
Coal
swelling
coal
Paramagnetic resonance
Swelling
bituminous coal
Bituminous coal
Charge transfer
Lignite
lignite
mixing ratio
nuclear magnetic resonance
Nuclear magnetic resonance

All Science Journal Classification (ASJC) codes

  • Energy(all)

Cite this

Kumagai, H., Matuoka, K., Norinaga, K., Chiba, T., & Sasaki, M. (1997). Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents. Unknown Journal, 42(1), 289-291.

Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents. / Kumagai, H.; Matuoka, K.; Norinaga, K.; Chiba, T.; Sasaki, M.

In: Unknown Journal, Vol. 42, No. 1, 1997, p. 289-291.

Research output: Contribution to journalArticle

Kumagai, H, Matuoka, K, Norinaga, K, Chiba, T & Sasaki, M 1997, 'Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents', Unknown Journal, vol. 42, no. 1, pp. 289-291.
Kumagai H, Matuoka K, Norinaga K, Chiba T, Sasaki M. Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents. Unknown Journal. 1997;42(1):289-291.
Kumagai, H. ; Matuoka, K. ; Norinaga, K. ; Chiba, T. ; Sasaki, M. / Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents. In: Unknown Journal. 1997 ; Vol. 42, No. 1. pp. 289-291.
@article{afab7f2b809745f396298e4b1e5d402f,
title = "Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents",
abstract = "In order to evaluate noncovalent interactions in coal, change in the associated molecular structure of coals in pyridine/CS2 mixed solvents have been investigated. For bituminous coal, variation in L-band EPR spectra with mixing ratio of the solvents is in a close correspondence to that in equilibrium swelling ratio and in molecular mobility obtained from 1H-NMR. The EPR spectra for lignite show similar variation to that for bituminous coal, however, does not correlate with equilibrium swelling ratio and molecular mobility. Since the L-band EPR characteristics appear to reflect the situation of aromatic π-π and charge transfer interactions in coal, these results indicate that swelling in the mixed solvents proceed with the declining of non-covalent interaction, such as aromatic π-π and charge transfer interaction, in coal.",
author = "H. Kumagai and K. Matuoka and K. Norinaga and T. Chiba and M. Sasaki",
year = "1997",
language = "English",
volume = "42",
pages = "289--291",
journal = "Quaternary International",
issn = "1040-6182",
publisher = "Elsevier Limited",
number = "1",

}

TY - JOUR

T1 - Change in the associated molecular structure of coals in pyridine/CS2 mixed solvents

AU - Kumagai, H.

AU - Matuoka, K.

AU - Norinaga, K.

AU - Chiba, T.

AU - Sasaki, M.

PY - 1997

Y1 - 1997

N2 - In order to evaluate noncovalent interactions in coal, change in the associated molecular structure of coals in pyridine/CS2 mixed solvents have been investigated. For bituminous coal, variation in L-band EPR spectra with mixing ratio of the solvents is in a close correspondence to that in equilibrium swelling ratio and in molecular mobility obtained from 1H-NMR. The EPR spectra for lignite show similar variation to that for bituminous coal, however, does not correlate with equilibrium swelling ratio and molecular mobility. Since the L-band EPR characteristics appear to reflect the situation of aromatic π-π and charge transfer interactions in coal, these results indicate that swelling in the mixed solvents proceed with the declining of non-covalent interaction, such as aromatic π-π and charge transfer interaction, in coal.

AB - In order to evaluate noncovalent interactions in coal, change in the associated molecular structure of coals in pyridine/CS2 mixed solvents have been investigated. For bituminous coal, variation in L-band EPR spectra with mixing ratio of the solvents is in a close correspondence to that in equilibrium swelling ratio and in molecular mobility obtained from 1H-NMR. The EPR spectra for lignite show similar variation to that for bituminous coal, however, does not correlate with equilibrium swelling ratio and molecular mobility. Since the L-band EPR characteristics appear to reflect the situation of aromatic π-π and charge transfer interactions in coal, these results indicate that swelling in the mixed solvents proceed with the declining of non-covalent interaction, such as aromatic π-π and charge transfer interaction, in coal.

UR - http://www.scopus.com/inward/record.url?scp=3242851809&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3242851809&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:3242851809

VL - 42

SP - 289

EP - 291

JO - Quaternary International

JF - Quaternary International

SN - 1040-6182

IS - 1

ER -