Geometrical Isomerism in Monomolecular Films


IN the course of investigations on these films by a method differing only in details from that described by Langmuir (Journ. Amer. Chem. Soc., 1917, p. 1868) I have found striking differences between the properties of films formed from the “cis” and “trans” forms of some fatty acids containing an ethylenic linkage, which indicate that of the two pairs of acids, oleic and elaidic, erucic and brassidic, oleic and erucic are the “cis” forms and elaidic and brassidic the “trans”. The results appear to be consistent with Langmuir's conception of the structure of the films, and this stereochemical configuration is that usually regarded as correct from chemical considerations.

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ADAM, N. Geometrical Isomerism in Monomolecular Films. Nature 107, 522 (1921).

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