title: Diketopyrrolopyrrole-Based Ratiometric/Turn-on Fluorescent Chemosensors for Citrate Detection in the Near-Infrared Region by an Aggregation-Induced Emission Mechanism.
abstract: This work reports two new diketoprrrolopyrrole-based fluorescent chemosensors (DPP-Py1 and DPP-Py2) using symmetrical diamides as recognition groups for selective and fast detection of citrate in the near-infrared region. To our delight, DPP-Py1 is a ratiometric sensor, whereas DPP-Py2 is a turn-on fluorescent sensor. It is worth noting that DPP-Py1 has higher accuracy and sensitivity with a relatively lower detection limit (1.8 × 10(-7) M) and better stability in different pH buffers than DPP-Py2. Scanning electron microscopy, dynamic light scattering analyses, (1)H NMR titration, and 2D-NOESY NMR suggested that the fluorescence increment of the probes DPP-Py1 and DPP-Py2 for citrate could probably originate from aggregation-induced emission (AIE) on the basis of the complexation of the pyridinium-based symmetrical diamides, DPPs, with carboxyl anions of citrate. Our work may provide a simpler and faster means for qualitative and quantitative analysis of citrate through an AIE mechanism.
authors.affiliation: Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Yandi
authors.initials: Y
authors.lastname: Hang
authors.affiliation: Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Niannian
authors.initials: N
authors.lastname: Lu
authors.affiliation: Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, P. R. China.
authors.forename: Jianli
authors.initials: J
authors.lastname: Hua
mesh_terms: D002951:Citrates / Q000032:analysis* / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D007259:Infrared Rays; D007659:Ketones / Q000737:chemistry*; D015394:Molecular Structure; D011758:Pyrroles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D002951:Citrates; D005456:Fluorescent Dyes; D007659:Ketones; D011758:Pyrroles; C000604894:diketopyrrolopyrrole dye