title: Perylene diimide appended with 8-hydroxyquinoline for ratiometric detection of Cu2+ ions and metal displacement driven "turn on" cyanide sensing.
abstract: Perylene diimide (PDI) 3 and 4 appended with 8-hydroxyquinoline derivatives have been synthesized and their photophysical and spectroscopic properties have been experimentally determined. Moreover, PDIs 3 and 4 show ratiometric behavior to detect Cu(2+) colorimetrically with visible color change from coral red to light pink, whereas 3 and 4 show "turn-off" behavior in fluorescence with lowest limit of detection 5 × 10(-7) M. The PDI 3 could be further utilized for ratiometric CN(-) detection colorimetrically and as "turn-on" sensor for CN(-) detection fluorometrically with lowest limit of detection 8 × 10(-6) M. The comparison of spectroscopic properties of PDI 1-4 highlights the importance of linking 8-hydroxyquinoline units on the PDI core at bay position for achieving Cu(2+) recognition event into ratiometric signal.
authors.affiliation: Department of Chemistry, UGC Centre for Advanced Studies, Guru Nanak Dev University, Amritsar, 143 005, India, prabhpreet.chem@gndu.ac.in.
authors.forename: Prabhpreet
authors.initials: P
authors.lastname: Singh
authors.forename: Lalit Singh
authors.initials: LS
authors.lastname: Mittal
authors.forename: Sandeep
authors.initials: S
authors.lastname: Kumar
authors.forename: Gaurav
authors.initials: G
authors.lastname: Bhargava
authors.forename: Subodh
authors.initials: S
authors.lastname: Kumar