Di-n-alkyl disulfides

In dialkyl di- and polysulfides, sulfur is the negative end of the dipole. The moment of a di-n-alkyl disulfide is approximately 2.00 D and of a trisulfide approximately 1.65 D, irrespective of the length of the carbon chain. In a tetrasulfide the moment is again higher thus, the alternating values 1.47, 2.00, 1.63, and 2.16 D, respectively, were obtained by Wood-row et al. (230) for the di-n-hexadecyl mono- through tetrasulfide series. 

Measurements have been made by Koch (152, 153) on disulfides and diethyl, diphenyl, and di-2-benzthiazyl tetrasulfide and dicyclohexyl hexasulfide, and by the following authors on complete series R2S with n = 1 through 4 Baer and Carmack (12) for R = n-hexadecyl, Minoura for R = benzyl (176) and p-tolyl (177), and Haszeldine and Kidd (142) for R = trifluoromethyl. Harris (140) has recorded the spectra of the di-o-nitrophenyl mono- through pentasulfide series, Gorin and Dougherty (135) those of the di-n-alkyl disulfides from methyl through butyl, and dimethyl... 

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