Premium
X‐ray diffraction and melting‐point studies on some long‐chain sulfur‐containing acids
Author(s) -
Witnauer Lee P.,
Lutz David,
Koenig N. H.,
Swern Daniel
Publication year - 1958
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02638781
Subject(s) - melting point , sulfur , sulfide , sulfone , sulfoxide , chemistry , alkyl , diffraction , crystallography , carbon fibers , carbon chain , organic chemistry , materials science , physics , composite number , optics , composite material
Summary X‐ray diffraction powder data and melting points have been determined on three series of crystalline long‐chain sulfur compounds, namely 11‐( n ‐alkylsulfonyl)‐undecanoic acids; 11‐( n ‐alkylsulfinyl) undecanoic acids; and 11‐( n ‐alkylthio) undecanoic acids; where R is a selected alkyl group from methyl through undecyl. In the sulfone series the long spacings increase regularly with the increase in the number of carbon atoms in R. In contrast to unsubstituted longchain fatty acids the odd and even members fall on the same line in the plot of long spacings against carbon atoms in R. As expected, a nonalternation in melting point is observed. In both the sulfoxide and sulfide series two nonparallel straight lines are obtained, one for the even‐membered and one for the odd‐membered compounds, in the plot of long spacings against carbon atoms in R. As expected, the melting points of the sulfoxides and sulfides show an alternation. Polymorphism is more evident and complicates the interpretations most in the sulfide series and least in the sulfone series. all three series of compounds crystallized as tilted dimers.