Ratiometric and Selective Fluorescent Sensor for Cu^IIBased on Internal Charge Transfer (ICT)

Abstract

A Cu(II)-sensing, ratiometric, and selective fluorescent sensor 1, N-butyl-4,5-di[(pyridin-2-ylmethyl)amino]-1,8-naphthalimide, was designed and synthesized on the basis of the mechanism of internal charge transfer (ICT). In aqueous ethanol solutions of 1, the presence of Cu(II) induces the formation of a 1:1 metal-ligand complex, which exhibits a strong, increasing fluorescent emission centered at 475 nm at the expense of the fluorescent emission of 1 centered at 525 nm. [structure: see text]

Fluorescent salicylaldehyde hydrazone as selective chemosensor for Zn2+ in aqueous ethanol: a ratiometric approach

“…At the same time, the perceived color change would make the rapid visual sensing possible and bring higher sensitivity. (13,14) Although many successful approaches to fl uorescent sensing of Zn 2+ have been reported, (11, few have the ability of a ratiometric fl uorescent response to Zn 2+ . (11,(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) Furthermore, most of these ratiometric fl uorescent probes for Zn 2+ suff er from shortcomings, such as low water solubility, disturbance from Cd 2+ , large fl uorescence increase or decrease in the Zn 2+ -bound form.…”

Multifunctional Mesoporous Silica Material Used for Detection and Adsorption of Cu2+ in Aqueous Solution and Biological Applications in vitro and in vivo

“…3), which shows a blue shift of about 47 nm compared to the 1,8-naphthalimide analogues. [26] Such a blue-shift was also observed in the emission spectra of SC encapsulated APTES/SBA-15 [25] and interpreted in terms of the molecular orbital confinement theory, that all energy levels of guest molecules increase in the channel of the host as a result of the confinement. [27] In our hybrid material the increase in the energy level of the P2 molecule probably results in the blue shift on the spectrum of SBA-P2.…”

“…These bands can be attributed to the typical electronic transition of the aromatic ring. [26] FT-IR spectra of SBA-P2 (see Supporting Information, Fig. S3) exhibited several new bands at about 2 923, 2 860, and 1 366 cm À1 , assignable to aliphatic CÀH stretching vibrations attributed to pendant, NÀH stretching vibrations of the imine groups and C¼C stretching vibrations of 1,8-naphthalimide attached SBA-15, respectively.…”

A Highly Selective Fluorescent Sensor for Cu2+ Based on a Covalently Immobilized Naphthalimide Derivative

“…Recently, naphthalimide-based probes for various cations via chromogenical and fluorogenical signals have received increasing interests such as Hg 2+ , 30 Zn 2+ , 31 Cu 2+ , 32 and Ag + . 33 However, only a few fiber-optic fluorescence sensors based on naphthalimide derivatives have been developed.…”