A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches

M. L. Hsu, D. M. Grant, R. J. Pugmire, Yozo Korai, Seong-Ho Yoon, I. Mochida

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A two-dimensional 13C-NMR chemical-shift-chemical-shift exchange experiment is described which permits the measurement of solid state 13C resonance frequencies at two different sample orientations. This technique provides a method for probing the principal values of multiple 13C chemical shift tensors in overlapping powder patterns as well as the orientational distribution function in partially oriented materials. Two mesophase pitches derived catalytically from naphthalene and methyl naphthalene have been examined. These two pitches have similar chemical shift tensors for the aromatic carbons indicating that they have similar carbon structural units. However, significant differences in the molecular structure of these two pitches are also noted. The aromatic rings in both oriented pitches exhibit axial ordering with the preferential orientation along the draw axis. The probability of finding the aromatic ring along the draw direction in the oriented mesophase pitch of methyl naphthalene is approximately three times greater than that in the oriented mesophase pitch of the naphthalene sample.

Original languageEnglish
Pages (from-to)729-739
Number of pages11
JournalCarbon
Volume34
Issue number6
DOIs
Publication statusPublished - Jan 1 1996

Fingerprint

Chemical shift
Naphthalene
Nuclear magnetic resonance
Tensors
Carbon
Powders
Molecular structure
Distribution functions
naphthalene
Experiments

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Hsu, M. L., Grant, D. M., Pugmire, R. J., Korai, Y., Yoon, S-H., & Mochida, I. (1996). A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches. Carbon, 34(6), 729-739. https://doi.org/10.1016/0008-6223(95)00215-4

A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches. / Hsu, M. L.; Grant, D. M.; Pugmire, R. J.; Korai, Yozo; Yoon, Seong-Ho; Mochida, I.

In: Carbon, Vol. 34, No. 6, 01.01.1996, p. 729-739.

Research output: Contribution to journalArticle

Hsu, ML, Grant, DM, Pugmire, RJ, Korai, Y, Yoon, S-H & Mochida, I 1996, 'A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches', Carbon, vol. 34, no. 6, pp. 729-739. https://doi.org/10.1016/0008-6223(95)00215-4
Hsu, M. L. ; Grant, D. M. ; Pugmire, R. J. ; Korai, Yozo ; Yoon, Seong-Ho ; Mochida, I. / A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches. In: Carbon. 1996 ; Vol. 34, No. 6. pp. 729-739.
@article{638191fb4e964f269b0e5cda9c99f42b,
title = "A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches",
abstract = "A two-dimensional 13C-NMR chemical-shift-chemical-shift exchange experiment is described which permits the measurement of solid state 13C resonance frequencies at two different sample orientations. This technique provides a method for probing the principal values of multiple 13C chemical shift tensors in overlapping powder patterns as well as the orientational distribution function in partially oriented materials. Two mesophase pitches derived catalytically from naphthalene and methyl naphthalene have been examined. These two pitches have similar chemical shift tensors for the aromatic carbons indicating that they have similar carbon structural units. However, significant differences in the molecular structure of these two pitches are also noted. The aromatic rings in both oriented pitches exhibit axial ordering with the preferential orientation along the draw axis. The probability of finding the aromatic ring along the draw direction in the oriented mesophase pitch of methyl naphthalene is approximately three times greater than that in the oriented mesophase pitch of the naphthalene sample.",
author = "Hsu, {M. L.} and Grant, {D. M.} and Pugmire, {R. J.} and Yozo Korai and Seong-Ho Yoon and I. Mochida",
year = "1996",
month = "1",
day = "1",
doi = "10.1016/0008-6223(95)00215-4",
language = "English",
volume = "34",
pages = "729--739",
journal = "Carbon",
issn = "0008-6223",
publisher = "Elsevier Limited",
number = "6",

}

TY - JOUR

T1 - A two-dimensional 13C-NMR study of powdered and oriented mesophase pitches

AU - Hsu, M. L.

AU - Grant, D. M.

AU - Pugmire, R. J.

AU - Korai, Yozo

AU - Yoon, Seong-Ho

AU - Mochida, I.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - A two-dimensional 13C-NMR chemical-shift-chemical-shift exchange experiment is described which permits the measurement of solid state 13C resonance frequencies at two different sample orientations. This technique provides a method for probing the principal values of multiple 13C chemical shift tensors in overlapping powder patterns as well as the orientational distribution function in partially oriented materials. Two mesophase pitches derived catalytically from naphthalene and methyl naphthalene have been examined. These two pitches have similar chemical shift tensors for the aromatic carbons indicating that they have similar carbon structural units. However, significant differences in the molecular structure of these two pitches are also noted. The aromatic rings in both oriented pitches exhibit axial ordering with the preferential orientation along the draw axis. The probability of finding the aromatic ring along the draw direction in the oriented mesophase pitch of methyl naphthalene is approximately three times greater than that in the oriented mesophase pitch of the naphthalene sample.

AB - A two-dimensional 13C-NMR chemical-shift-chemical-shift exchange experiment is described which permits the measurement of solid state 13C resonance frequencies at two different sample orientations. This technique provides a method for probing the principal values of multiple 13C chemical shift tensors in overlapping powder patterns as well as the orientational distribution function in partially oriented materials. Two mesophase pitches derived catalytically from naphthalene and methyl naphthalene have been examined. These two pitches have similar chemical shift tensors for the aromatic carbons indicating that they have similar carbon structural units. However, significant differences in the molecular structure of these two pitches are also noted. The aromatic rings in both oriented pitches exhibit axial ordering with the preferential orientation along the draw axis. The probability of finding the aromatic ring along the draw direction in the oriented mesophase pitch of methyl naphthalene is approximately three times greater than that in the oriented mesophase pitch of the naphthalene sample.

UR - http://www.scopus.com/inward/record.url?scp=0029698485&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029698485&partnerID=8YFLogxK

U2 - 10.1016/0008-6223(95)00215-4

DO - 10.1016/0008-6223(95)00215-4

M3 - Article

AN - SCOPUS:0029698485

VL - 34

SP - 729

EP - 739

JO - Carbon

JF - Carbon

SN - 0008-6223

IS - 6

ER -