Thin-film polydiacetylenes of a stable blue phase based on symmetrical and unsymmetrical diacetylene N-arylcarbamates

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Resumo

The conditions and features of the formation of Langmuir monolayers of symmetrical and asymmetrical diacetylene N-arylcarbamates and the structural organization of Langmuir-Schaefer films based on them were studied. Photopolymerization of monolayer solid films of two types of molecules was monitored using absorption spectroscopy and showed the transition of diyne molecules to the blue phase polydiacetylene state. The efficiency of the solid-phase topochemical polymerization reaction in a film of symmetrical diynes turned out to be 5 times higher than in a film of asymmetrical diyne molecules. The morphology of monolayer surfaces before and after UV irradiation was studied using scanning electron microscopy.

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Sobre autores

А. Alekseev

A. M. Prokhorov General Physics Institute of the Russian Academy of Science

Autor responsável pela correspondência
Email: alexanderalekseev@yandex.ru
Rússia, Moscow

S. Vyaz’min

Zh. I. Alferov Federal State Budgetary Institution of Higher Education and Science Saint Petersburg National Research Academic University of the Russian Academy of Science

Email: alexanderalekseev@yandex.ru
Rússia, St. Petersburg

A. Ivanov

A. M. Prokhorov General Physics Institute of the Russian Academy of Science

Email: alexanderalekseev@yandex.ru
Rússia, Moscow

V. Klechkovskaya

NRC “Kurchatov Institute”

Email: alexanderalekseev@yandex.ru

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics

Rússia, Moscow

М. Lukasov

NRC “Kurchatov Institute”

Email: alexanderalekseev@yandex.ru

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics

Rússia, Moscow

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2. Fig. 1. Compression isotherms of a monolayer of symmetrical (1) and asymmetrical (2) molecules of diacetylene N-arylcarbamates on the surface of an aqueous subphase.

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3. Fig. 2. Changes in the optical absorption spectra of monolayer diyne films with changes in the time of their irradiation with UV light: a – symmetric diyne, b – asymmetric diyne.

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4. Fig. 3. Changes in the intensity of the exciton absorption band of the blue phase of PDA (a) and the shift of this band to the long-wavelength region (b) with an increase in the UV irradiation time for films of symmetric (1) and asymmetric (2) diyne molecules.

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5. Fig. 4. SEM images of a monolayer of asymmetric diyne MeO–3–2 molecules on the surface of Si substrates before (a) and after (b) 10 min of UV irradiation.

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6. Fig. 5. SEM images of a monolayer of symmetric diyne molecules on the surface of Si substrates before (a) and after (b) 10 min of UV irradiation.

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