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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 11
BKCSDE 21(11)
November 20, 2000

Title	Study on Direct Dipolar Effect of Neighboring Protons in Proton Coupled ¹³C Relaxation Experiment
Author	Hyun Namgoong, Impyo Lee, Jo Woong Lee
Keywords
Abstract	The dipolar effect of neighboring protons that are not directly bonded to the carbon of interest on coupled carbon-13 relaxation in a simple organic molecule has been studied by comparing the relaxation behaviors of labeled carbon-13 in Br¹³CH₂COOH with those in BrCH₂¹³COOH. Various pulse sequences, such as coupled inversion recovery pulse sequence, J-negative and J-positive pulse sequence, and nonselective and selective proton πpulse sequence, were employed to perform the required coupled spin relaxation experiments. To gain information on various spectral densities, including that of dipolar-CSA cross correlation, the experiments were performed on two different spectrometers, operating, respectively, at 50.31 and 125.51MHz for ¹³C. The magnitude of CH dipolar spectral densities for BrCH₂¹³COOH was found to be about 8% of those for Br¹³CH₂COOH, which means the effect due to the protons not directly bonded to the carbon of interest is small but not completely negligible.
Page	1077 - 1084
Full Text	PDF

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