Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Study on Direct Dipolar Effect of Neighboring Protons in Proton Coupled $^{13}C$ Relaxation Experiment

  • Published : 20001100
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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 $Br13CH_2COOH$ with those in $BrCH_213COOH.$ Various pulse sequences, such as coupled inversion recovery pulse sequence, J-negative and J-positive pulse sequence, and nonselective and selective proton ${\pi}pulse$ 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 $BrCH_213COOH$ was found to be about 8% of those for $Br13CH_2COOH$, which means the effect due to the protons not directly bonded to the carbon of interest is small but not completely negligible.

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  1. A Study on the Effect of Neighboring Protons in Proton-Coupled Spin-Lattice Relaxation of Methylene Carbon-13 in n-Undecane vol.23, pp.5, 2000, https://doi.org/10.5012/bkcs.2002.23.5.727