Add time:08/28/2019         Source:sciencedirect.com

We demonstrate that a significant in-plane anisotropy is present in monolayers of 2-docosylamino-5-nitropyridine (cas 117088-74-1) at an air-water interface. The floating monolayers were studied by in situ transmission second-harmonic generation under normal incidence and shown to have C1h symmetry. The formation of such anisotropy monolayers was studied as a function of the surface pressure of the layers. The process was initiated by the formation of domains in which the molecules are preferentially aligned parallel rather than antiparallel to each other.

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