Knowledge Bank

The Raman and infrared spectra of the liquid addition compound formed between boron trifluoride and dimethyl sulfide have been obtained. Infrared measurements have been made from 4000 to $200cm-1$ and Raman measurements from 4000 to $100cm-1$. Samples containing enriched $\mathrm{<mrow\; data-mjx-texclass="ORD">10</mrow>}B$ or $\mathrm{<mrow\; data-mjx-texclass="ORD">11</mrow>}B$ have been synthesized and the isotopic frequency shifts recorded. Assignments of the observed vibrational bands have been made and analogies with the spectra of $BF3-O(CH3)2$ have been pointed out. Isotopic partition function ratios have been tabulated and the equilibrium constant for boron isotope exchange between $BF3-S(CH3)2$ and $BF3$ has been calculated and compared with experimental values. Research sponsored by the U. S. Atomic Energy Commission under contract with the Union Carbide Corporation.