Abstract

The 13C nucleus bonded to Br relaxes entirely or partly by the scalar coupling mechanism because the resonance frequency of 13C is close to that of Br and Br is rapidly relaxed by quadrupole interaction. The spin-lattice relaxation curves and the NOE enhancement factors of 13C bonded to Br were measured for compounds with various carbon hybridization, i.e., sp 3, sp 2, and sp carbons. Then the spin-spin coupling constants between 13C and Br, J CBr, were determined by analyzing the relaxation curves, where the NOE enhancement is taken into account. The J CBr values thus obtained show a number of interesting features, including a notable correlation with the s character of the carbon hybridization.

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