title: Solvatochromism, preferential solvation of 2,3-bis(chloromethyl)-1,4-anthraquinone in binary mixtures and the molecular recognition towards p-tert-butyl-calix[4]arene.
abstract: Optical absorption and fluorescence emission spectra of 2,3-bis(chloromethyl)-1,4-anthraquinone (DCMAQ) in single solvents namely, carbon tetrachloride, acetonitrile, chloroform, propan-2-ol and its binary mixtures [carbon tetrachloride/chloroform, chloroform/acetonitrile, chloroform/propan-2-ol] have been investigated. The preferential solvation of DCMAQ in above mixtures has been studied by monitoring the absorption and fluorescence spectra of DCMAQ. The spectral features indicate that DCMAQ is preferentially solvated by CHCl(3) in the above mixtures. This can be elucidated from the local mole fraction, non-linearity in transition energy plot, preferential solvation index (delta (s2)) and (f2/f1) values. Molecular recognition properties of p-tert-butylcalix[4]arene (tBC) to DCMAQ via hydrogen bonding and pi-pi interaction were sensed successfully on the basis of absorption and fluorescence emission spectroscopies, by which the stoichiometry ratio and the binding constant of the tBC-DCMAQ complex were determined.
authors.affiliation: Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai 625 021, India. saserekha@gmail.com
authors.forename: V
authors.initials: V
authors.lastname: Sasirekha
authors.forename: P
authors.initials: P
authors.lastname: Vanelle
authors.forename: T
authors.initials: T
authors.lastname: Terme
authors.forename: C
authors.initials: C
authors.lastname: Meenakshi
authors.forename: M
authors.initials: M
authors.lastname: Umadevi
authors.forename: V
authors.initials: V
authors.lastname: Ramakrishnan