Langmuir Films of Amphiphilic Crown Ethers

We have used X-ray reflectivity and grazing-incidence X-ray diffraction to study amphiphilic crown ethers 1 and 2 at the air−water interface. A new synthetic route was employed, which substantially reduced the level of impurities. Unlike previous studies of 1, we saw no evidence of a first-order lyi...

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Bibliographic Details
Published in:The journal of physical chemistry. B 1999-07, Vol.103 (30), p.6206-6214
Main Authors: Heiney, Paul A, Stetzer, MacKenzie R, Mindyuk, Oksana Y, DiMasi, Elaine, McGhie, Andrew R, Liu, Hu, Smith, Amos B
Format: Article
Language:English
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Summary:We have used X-ray reflectivity and grazing-incidence X-ray diffraction to study amphiphilic crown ethers 1 and 2 at the air−water interface. A new synthetic route was employed, which substantially reduced the level of impurities. Unlike previous studies of 1, we saw no evidence of a first-order lying-down to standing-up transition of the alkyl tails. We did observe in both compounds a gradual reorientation of the tails away from the interface as the film was compressed, followed by an irreversible collapse to a multilayer structure. The monolayer films have a fluid-like inplane structure, while the multilayer films are crystalline.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp990787j