title: Contrasting tunability of quinizarin fluorescence with p-sulfonatocalix[4,6]arene hosts.
abstract: This study reveals the intriguing modulations in the photophysics of quinizarin (QZ) on its interaction with p-sulfonatocalix[4]arene (SCX4) and p-sulfonatocalix[6]arene (SCX6) hosts. While the SCX6-QZ system shows the usual reduction in both fluorescence intensity and lifetime, the SCX4-QZ system shows a contrasting effect of enhancement in the fluorescence intensity and reduction in the fluorescence lifetime. Such a contrasting effect is not only unusual but also observed for the first time for any host-guest system. The observed results are justifiably correlated with the changes in both radiative and nonradiative decay rate constants for the SCX4-QZ system.
authors.affiliation: Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. sharmidc@barc.gov.in hpal@barc.gov.in.
authors.forename: Poojan Milan
authors.initials: PM
authors.lastname: Gharat
authors.forename: Sindhu
authors.initials: S
authors.lastname: Joseph
authors.forename: Mahesh
authors.initials: M
authors.lastname: Sundararajan
authors.forename: Sharmistha
authors.initials: S
authors.lastname: Dutta Choudhury
authors.forename: Haridas
authors.initials: H
authors.lastname: Pal