Molecular arrangements in polymorphous monolayer structures of carbocyanine dye J-aggregates

作者：Prokhorov Valery V^*; Pozin Sergey I; Lypenko Dmitry A; Perelygina Olga M; Mal'tsev Eugene I; Vannikov Anatoly V

来源：Chemical Physics Letters, 2012, 535: 94-99.

DOI：10.1016/j.cplett.2012.03.052

Subangstrom accuracy AFM height measurements and high-resolution visualization of crystallographic habits enabled us to give an insight into how stacked dye molecules are arranged in J-aggregate monolayers of 3,3'-di(gamma-sulfopropyl)-4,4',5,5'-dibenzo-9-ethylthiacarbocyanine betaine pyridinium. Ladder and staircase molecular arrangements were self-consistently proposed for the explanation of the stripe-like and leaf-like J-aggregate polymorphism correspondingly. It is inferred that a J-aggregate building unit constitutes a symmetric monolayer of similar to 1.35 nm in a height that consists of all-trans monomers with anti-parallel up-down orientation and a slip angle of similar to 15 degrees. As it follows from AFM images of folded/overlapped J-aggregates, these species manifest themselves as mechanically very flexible structures.

• 出版日期2012-5-11