Vibrational spectra and normal-coordinate analyses using a modified Urey-Bradley force field are reported for 1,2,3,5,6-pentathiepane (lenthionine), 1,3,5,7-tetrathiocane, and 1,2,3-trithiane. Characteristic Raman bands are identified for S-CH2-S and S-S-S functionalities in cyclic molecules.
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