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Title: {sup 1}H and {sup 15}N dynamic nuclear polarization studies of carbazole

Abstract

{sup 15}N NMR experiments, combined with dynamic nuclear polarization (DNP), are reported on carbazole doped with the stable free radical 1,3-bisdiphenylene-2-phenylallyl (BDPA). Doping shortens the nuclear relaxation times and provides paramagnetic centers that can be used to enhance the nuclear signal by means of DNP so that {sup 15}N NMR experiments can be done in minutes. The factors were measured in a 1.4 T external field, using both unlabeled and 98% {sup 15}N labeled carbazole with doping levels varying between 0.65 and 5.0 wt {degree} BDPA. A doping level of approximately 1 wt {degree} produced optimal results. DNP enhancement factors of 35 and 930 were obtained for {sup 1}H and {sup 15}N, respectively, making it possible to perform {sup 15}N DNP NMR experiments at the natural abundance level.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (US)
Sponsoring Org.:
New Energy and Industrial Technology Development Organization; USDOE
OSTI Identifier:
20075895
DOE Contract Number:  
FG03-94ER14452; AC06-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory
Additional Journal Information:
Journal Volume: 104; Journal Issue: 19; Other Information: PBD: 18 May 2000; Journal ID: ISSN 1089-5639
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; NUCLEAR MAGNETIC RESONANCE; NITROGEN 15; HYDROGEN 1; POLARIZATION; CARBAZOLES; RADICALS; DOPED MATERIALS

Citation Formats

Hu, J.Z., Solum, M.S., Wind, R.A., Nilsson, B.L., Peterson, M.A., Pugmire, R.J., and Grant, D.M. {sup 1}H and {sup 15}N dynamic nuclear polarization studies of carbazole. United States: N. p., 2000. Web. doi:10.1021/jp9938011.
Hu, J.Z., Solum, M.S., Wind, R.A., Nilsson, B.L., Peterson, M.A., Pugmire, R.J., & Grant, D.M. {sup 1}H and {sup 15}N dynamic nuclear polarization studies of carbazole. United States. doi:10.1021/jp9938011.
Hu, J.Z., Solum, M.S., Wind, R.A., Nilsson, B.L., Peterson, M.A., Pugmire, R.J., and Grant, D.M. Thu . "{sup 1}H and {sup 15}N dynamic nuclear polarization studies of carbazole". United States. doi:10.1021/jp9938011.
@article{osti_20075895,
title = {{sup 1}H and {sup 15}N dynamic nuclear polarization studies of carbazole},
author = {Hu, J.Z. and Solum, M.S. and Wind, R.A. and Nilsson, B.L. and Peterson, M.A. and Pugmire, R.J. and Grant, D.M.},
abstractNote = {{sup 15}N NMR experiments, combined with dynamic nuclear polarization (DNP), are reported on carbazole doped with the stable free radical 1,3-bisdiphenylene-2-phenylallyl (BDPA). Doping shortens the nuclear relaxation times and provides paramagnetic centers that can be used to enhance the nuclear signal by means of DNP so that {sup 15}N NMR experiments can be done in minutes. The factors were measured in a 1.4 T external field, using both unlabeled and 98% {sup 15}N labeled carbazole with doping levels varying between 0.65 and 5.0 wt {degree} BDPA. A doping level of approximately 1 wt {degree} produced optimal results. DNP enhancement factors of 35 and 930 were obtained for {sup 1}H and {sup 15}N, respectively, making it possible to perform {sup 15}N DNP NMR experiments at the natural abundance level.},
doi = {10.1021/jp9938011},
journal = {Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory},
issn = {1089-5639},
number = 19,
volume = 104,
place = {United States},
year = {2000},
month = {5}
}