NDLI: A comparative study of two amphiphilic merocyanines: from monomers to aggregates in Langmuir and Langmuir

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A comparative study of two amphiphilic merocyanines: from monomers to aggregates in Langmuir and Langmuir–Blodgett mixed films

Content Provider	Royal Society of Chemistry (RSC)
Author	Ponterini, Glauco Lodi, Andrea Caselli, Monica Momicchioli, Fabio Giancane, Gabriele
Copyright Year	2013
Abstract	The Langmuir–Blodgett (LB) films with J aggregates of the amphiphilic MC2 merocyanine have been deeply investigated for more than two decades, mainly because of their interest for applications in photonic devices. To extend the excitation/emission wavelength range, we have studied an homologous dye, MC1, based on a shorter merocyanine chromophore, aiming at checking the ability of this compound to arrange into J aggregates within stable LB films. In this comparative MC1/MC2 investigation, we have addressed the structural and spectroscopic properties of the monomers in solution, the thermodynamic and morphological properties of the Langmuir monolayers at the air–water interface and the spectroscopic and photophysical properties, and the structural features thence obtainable, of the aggregates in the LB films. 1H NMR experiments have shown that, in chloroform solutions, both dyes adopt planar conformations with the hydrophilic and hydrophobic groups pointing to opposite directions. Strongly attractive interactions are exhibited by both dyes towards arachidic acid in monolayers at the air–subphase interface, with a maximum stability for the 1 : 2 MC(1/2) : AA mixture. Relatively homogeneous LB multilayers have been obtained from 1 : 4 and 1 : 2 MC : AA mixtures with good transfer ratios. Absorption and emission of the LB films of MC1 are dominated by J aggregates, while those of MC2 show some H aggregate contributions too. The J aggregates of both compounds exhibit a tendency to align with the transition dipoles along the film dipping direction, only slightly tilted relative to the substrate surface; however, this tendency is more pronounced for the MC1 J aggregates. Overall, MC1 yields slightly more stable monolayers and more solid multilayers compared to MC2.
Starting Page	1468
Ending Page	1475
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	3
Issue Number	5
Journal	RSC Advances
DOI	10.1039/c2ra22962e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Langmuir\u2013Blodgett trough Chloroform Merocyanine Arachidic acid Marvel Comics 2 Hydrophobe Wavelength Compact Cassette Dye Irving Langmuir Carboxylic acid Langmuir Blodgett Amphiphile Nuclear magnetic resonance Hydrophile Melanocortin 1 receptor Chromophore
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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