Effects of hydrogen bonding upon the anisotropic reorientation of 2,6-dichlorophenol

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Abstract
The effects of hydrogen bonding upon molecular reorientation in the system dichlorophenol/pyridine/carbon tetrachloride have been studied using nuclear magnetic spin–lattice relaxation techniques. A complete analysis of the relaxation behavior of individual lines in the strongly coupled AB2 spin system of 2,6‐dichlorophenol‐0‐d combined with 13C relaxation rates allowed determination of all three principal components of the rotational diffusion tensor for dichlorophenol. The formation of a pyridine–dichlorophenol hydrogen bond has the effect of slowing down molecular reorientation of both molecules about axes perpendicular to the hydrogen bond while leaving motion about the hydrogen bond axis almost unaffected.