A Colorimetric and Ratiometric Fluorescent Chemosensor with Three Emission Changes: Fluoride Ion Sensing by a Triarylborane– Porphyrin Conjugate

Abstract

Perturbation in the energy‐transfer pathway and of the π conjugation between the chromophores in a triarylborane–porphyrin conjugate on coordination of a fluoride ion to the boron center is assumed to account for the observation of the three emission bands (at 356, 670, and 692 nm). The system also displays a colorimetric (purple to green, see picture, and red to bluish emission) response to fluoride ions.

Nuclear Magnetic Resonance Spectroscopy Investigations of Naphthalene-Based 1,2,3-Triazole Systems for Anion Sensing

“…While fluoride induces the strongest response in both molecules, with PTP the intensity of the fluorescence with OAc − and H 2 PO 4 − was on par [49]. For NpTP, the improvement in ion selectivity is verified by a fluorescence output with H 2 PO 4 − that is significantly lower than that for OAc − (Figure 9), a clear and marked distinction occurring between F − versus OAc − versus H 2 PO 4 − .…”

“…When chemosensors respond to external stimuli, distinct and significant changes can be observed-for example, in color or fluorescence [4][5][6]. Anions are crucial in biological and environmental systems; optimum concentrations are critical to proper functioning, as an excess or diminished amount of anions can prove fatal in both systems [7].…”

Incorporation of the fluoride induced SiO bond cleavage and functionalized gold nanoparticle aggregation into one colorimetric probe for highly specific and sensitive detection of fluoride

“…Considering the bond energy, hydrogen bond (HB) which belongs to weak intermolecular force scope is susceptible to be interfered by co-exist anions. The other class of sensors was designed to incorporate special receptors of electron-deficient Lewis acidic centers such as boron or silicon [16][17][18][19]. In these probe, F − as a 'hard base', could strongly interact with the center atom, thus converting the recognition event into a detectable optical signal.…”

A near-infrared phosphorescent probe for F− based on a cationic iridium(III) complex with triarylboron moieties

“…In addition, triarylborane derivatives exhibit relatively intense fluorescent characteristics due to the conjugation of p  (B) with the π-electron system in the aryl group (p  (B)- conjugation), giving rise to unique electronic structures. In view of these, luminescent triarylborane derivatives as F  probes have received widespread research interest recently [22][23][24].…”