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Crystals of dimethyl sulfoxide were studied at 5 C. They are monoclinic, space group P2~/c, with cell dimensions a= 5.303+ 0.005, b= 6-829 ___ 0.003, c= 11.693+ _ 0.010/~,/~= 94 30'+ 15'and 4 molecules per cell. Least-squares refinements were carried out both excluding and including unobserved reflections. For the former case the final R is 7.4~ o (507 reflections), for the latter 13.3 Vo (777 reflections). Although no molecular symmetry is required, the molecule possesses symmetry m within the accuracy of the determination. Bond distances were corrected for librational motion. The distances found (uncorrected values are given in parentlaeses) are: SO= 1.531+ 0.005.~(1.513), and SC (average)= l-798+ 0.010/~(1-788). The most important bond angles are OSC-(average) 106.7+ 0.4 and CSC 97.4+ 0" 4. Bond distances, particularly of SO, angles and packing are discussed.