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Updated: Jun 14, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
Published on: April 1, 2013
Molecular interaction of organic dyes in bulk and confined media
Amitabha Chakraborty1, Moazzam Ali, Swapan K Saha
1Department of Chemistry, University of North Bengal, Rajarammohanpur, Siliguri, Darjeeling, West Bengal 734013, India.
Abstract:
Molecular interactions of five thiazine dyes with increasing alkyl substitution have been studied in aqueous and microemulsion media at 303K within a concentration range of (1.35-7.00)x10(-4)M. The dimerization constant (K(d)) values for the five dyes are ranged between 1.761 and 6.258x10(3)lmol(-1) in bulk water media, where as in microemulsion media, K(d)'s are ranged between 1.760 and 4.110x10(3)lmol(-1). Thionine (with no methyl substitution) and azure A (with two methyl substitution) displayed slightly larger K(d) values in microemulsion water pools compared to bulk water while other dyes recorded significant drop in K(d) values. The influence of microemulsion media on the molecular interaction of dyes has been explained in terms of electrostatic and hydrophobic factors. The monomer and the dimer spectra are explained in terms of molecular exciton model and the optical absorption parameters of both the species are reported in bulk and confined media.
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