Crystallography and Molecular Arrangement of Polymorphic Monolayer J-Aggregates of a Cyanine Dye: Multiangle Polarized Light Fluorescence Optical Microscopy Studyстатья Исследовательская статья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.

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[1] Crystallography and molecular arrangement of polymorphic monolayer j-aggregates of a cyanine dye: Multiangle polarized light fluorescence optical microscopy study / V. V. Prokhorov, S. I. Pozin, O. M. Perelygina, E. I. Mal’tsev // Langmuir : the ACS journal of surfaces and colloids. — 2018. — Vol. 34, no. 16. — P. 4803–4810. The molecular orientation in monolayer J-aggregates of 3,3-di(γ-sulfopropyl)-5,5-dichlorotiamonomethinecyanine dye (TC) has been precisely estimated using improved linear polarization measurements in the fluorescence microscope in which a multi-angle set of polarization data is obtained using sample rotation. The estimated molecular orientation, supplemented with the previously established crystallographic constraints based on the analysis of the well-developed two-dimensional J-aggregate shapes unambiguously indicate the staircase type of molecular arrangement for strip-like J-aggregates with the staircases oriented along strips. The molecular transition dipoles are inclined at an angle ∼25o to the strip direction, while the characteristic strip vertex angle ∼45o is formed by the [100] and [1-10] directions of the monoclinic unit cell. Measurements of the geometry of partially unwound tubes and their polarization properties support the model of tube formation by close-packed helical winding of flexible monolayer strips. In the tubes, the long molecular axis are oriented at a small angle in the range of 5-15o to the normal to the tube axis providing low bending energy. At a nanoscale, high-resolution AFM imaging of J-aggregate monolayers reveals an complex quasi-one-dimensional organization. [ DOI ]

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