Abstract
Carbon-13 spin-lattice relaxation times and nuclear Overhauser enhancements of dichloromethane were measured in “inert” solvents of varying viscosity and in various Lewis basic solvents. Derived CH rotational correlation times were observed to remain approximately constant in the non-interactive mixtures, but to increase, by as much as a factor of three, in the basic solvents. Correlation times calculated by the Hu-Zwanzig slip model were, in all cases, shorter than the measured values. The theory predicted a viscosity dependence of τ c , which was not observed experimentally. Rotational times calculated with the Hynes-Kapral-Weinberg model were somewhat longer than the observed values. However, the theory did correctly predict that τ c should be approximately independent of viscosity in the non-interactive mixtures. A close agreement between theory and experiment was found for dichloromethane in the basic solvents. Therefore, the increase of τ c in these solutions cannot be ascribed to slowed reorientation of the associated dimer. The results suggest that the CH bond retains a degree of rotational mobility in the hydrogen bonded complex.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
