Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions

Journal of the Brazilian Chemical Society

Lukese R. Menegussi¹  Silvano R. Valandro¹  Alessandra L. Poli¹  Carla C. Schmitt¹  Miguel G. Neumann¹ 

[1] ,Universidade de São Paulo Instituto de Química de São Carlos São Carlos SP ,Brazil

关键词: pseudoisocyanine;    hydrotropes;    alginate;    J-aggregates;   

DOI  :  10.5935/0103-5053.20140128

来源: SciELO

【 摘 要 】

The photophysical behaviour of the dye pseudoisocyanine (PIC) was studied in macromolecular (sodium alginate) and hydrotropic (sodium toluenesulphonate and sodium styrenesulphonate) solutions. It was found that the placement of the dye in these media affected the spectroscopic properties and the lifetimes of its excited states. The effects are traced down to the interactions of the dye molecules with the macromolecules or their placement in the hydrotropic aggregates, inducing the formation of J-aggregates of the dye or constraining its internal movements reducing the rate of internal conversion. The lifetimes of the triplet state of the dye in alginate were of the order of 20-30 ns in freshly prepared solutions, whereas when leaving the solution to rest for some hours the decay became biexponential with the growing of a species with lifetime around 150 ns. The latter is assigned to dye molecules placed in the alginate network.

【 授权许可】

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