Determination of natural abundance $^1^5N-^1H$ and $^1^3C-^1H$ dipolar couplings of molecules in a strongly orienting media using two-dimensional inverse experiments

Deepak, Vinay HS and Joy, Anu and Suryaprakash, N (2006) Determination of natural abundance $^1^5N-^1H$ and $^1^3C-^1H$ dipolar couplings of molecules in a strongly orienting media using two-dimensional inverse experiments. In: Magnetic Resonance in Chemistry, 44 (5). pp. 553-565.

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Abstract

NMR spectra of molecules oriented in liquid crystals provide homo- and heteronuclear dipolar couplings and thereby the geometry of the molecules. Several inequivalent dilute spins such as $^1^3C$ and $^1^5N$ coupled to protons form different coupled spin systems in their natural abundance and appear as satellites in the proton spectra. Identification of transitions belonging to each spin system is essential to determine heteronuclear dipolar couplings, which is a formidable task. In the present study, using $^1^5N-^1H$ and $^1^3C-^1H$ HSQC, and HMQC experiments we have selectively detected spectra of each rare spin coupled to protons. The $^{15}N-^1H$ and $^{13}C-^1H$ dipolar couplings have been determined in the natural abundance of $^{13}C$ and $^{15}N$ for the molecules pyrazine, pyrimidine and pyridazine oriented in a thermotropic liquid crystal.

Item Type:	Journal Article
Publication:	Magnetic Resonance in Chemistry
Publisher:	John Wiley & Sons
Additional Information:	Copyright of this article belongs to John Wiley & Sons.
Keywords:	NMR spectroscopy;HSQC;HMQC;pyrazine;pyrimidine;pyridazine;dipolar couplings;natural abundance;liquid crystals;inverse experiment
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 Jun 2008
Last Modified:	19 Sep 2010 04:28
URI:	http://eprints.iisc.ac.in/id/eprint/7154

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