Surface pressure driven supramolecular architectures from mixed H-aggregates of dye-capped azobenzene derivative

Langmuir : the ACS Journal of Surfaces and Colloids
B Vijai Shankar, Archita Patnaik

Abstract

We demonstrate a soft chemical approach for the synthesis of dimensionally dictated functionalized mesostructures by continuous tuning of the surface molecular density of a photoreceptable molecule (E)-1-(3-chloro-4-(octyloxy)phenyl)-2-phenyldiazene (compound 1) with Rhodamine B (Rh B). Highly oriented cylindrical microtubules with a hollow center running the entire distance of the assembly in a parallel-packed configuration were formed at the air-water interface. The surface tension driven self-organized structures were evidenced from electronic absorption and steady-state fluorescence spectroscopy in conjunction with optical, polarizing, and epifluorescence microscopy and microspectroscopy; the structural building blocks were identified to be mixed H-aggregates from compound 1 and Rh B of 1:1 stoichiometry, corroborated by a blue shift in the characteristic absorption features. The appearance of a crossover point (apparent isosbestic point) instead of a sharp defined isosbestic point in the absorption spectra signified the formation of mixed H-aggregates from trans-azobenzenes in ion-dipole interaction with the charged Rh B. Increasing the temperature induced an end-to-end self-assembly of the hollow tubules, and photoisomeri...Continue Reading

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Citations

Sep 19, 2012·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Pallab Gayen, Chittaranjan Sinha
Jan 24, 2007·Physical Chemistry Chemical Physics : PCCP·Päivi AhonenKyösti Kontturi
Mar 6, 2018·Chemistry, an Asian Journal·Heshu FangJun Hu
Aug 10, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Bapi DeySyed Arshad Hussain

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