Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1531 - 1542 (1988)
Update date:2022-08-05
Topics:
Georges, Christian
Lewis, T. John
Llewellyn, J. Patrick
Salvagno, Susanna
Taylor, D. Martin
et al.
Long, straight alkane chains have been functionalised with sulphur-containing groups at the chain-end, near the chain-end and at the midchain.The behaviour of such compounds in Langmuir films has been investigated.Several gave stable monolayers from which molecular areas have been determined.Surface potential (ΔV) measurements carried out simultaneously with the pressure-area (?-A) isotherms provided an important insight into the surface behaviour of some of the compounds.On compression, changes in the ΔV-A characteristics were clearly visible, well before any significant changes occured in the ?-A curves.New evidence presented here suggests also that the previous interpretation of the ?-A behaviour of C10H21SO(CH2)10CO2H in terms of molecular orientation was incorrect, dissolution of the monolayer in the water subphase at higher pressure being the most likely explanation.Attempts at depositing chiral L.B. multilayers of (+)-C18H37SO-p-tolyl were not successful because of crystallite formation on te quartz support.Multilayers of (+)-S-octadecylcysteine were deposited successfully, albeit with a monolayer of stearic acid interposed every seven monolayers of the chiral compound.No optical rotation was observed in the films.
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