Quantitative investigations of thermal and photoinduced J- and H-aggregation of hydrophobic spirooxazines in binary solvent through UV/vis spectroscopy
RSC Advances, ISSN: 2046-2069, Vol: 4, Issue: 40, Page: 20974-20983
2014
- 11Citations
- 21Captures
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Article Description
The aggregation of two hydrophobic spirooxazine dyes has been investigated in water-acetonitrile binary solvent and in presence of sodium dodecylsulfate (SDS). For the thermochromic molecule 1, aggregation is spontaneous and occurs when a large amount of water is added to an acetonitrile solution of the dye. There exists an optimum value of the water-acetonitrile molar ratio giving rise to a sharper H-aggregate visible absorption spectrum. Kinetic analysis of the H-aggregate formation has shown that there is an increase in the sticking probability of the monomers, as the aggregates grow. A subtle interplay between H- and J- aggregation was witnessed by adding small amounts of SDS. This change is so sensitive that this system could be the basis of a new chemosensory technique for SDS assessment. Excess of surfactant induces the collapse of the aggregates and the re-dissolution of the dye under the form of a merocyanine-SDS ion-pair. For the spirooxazine 2, aggregation must be photo-induced. Comparison of the spectral evolutions of the two dyes in the presence of SDS has shown that the opening of the closed spirooxazines paves the way to the merocyanine-SDS ion-pair formation. Reversibility of the aggregation has been suggested to occur when the aggregate size is still small. Finally, reversibility has been checked experimentally by precipitate re-dissolution and spirooxazine recovery. Possible structures and reactivity of the H- and J-aggregates have been deduced. This journal is © the Partner Organisations 2014.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84901352237&origin=inward; http://dx.doi.org/10.1039/c4ra02587c; https://xlink.rsc.org/?DOI=C4RA02587C; http://xlink.rsc.org/?DOI=C4RA02587C; http://pubs.rsc.org/en/content/articlepdf/2014/RA/C4RA02587C; https://dx.doi.org/10.1039/c4ra02587c; https://pubs.rsc.org/en/content/articlelanding/2014/ra/c4ra02587c
Royal Society of Chemistry (RSC)
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