N-doped carbon dots covalently functionalized with pillar[5]arenes for Fe³⁺ sensing

Abstract

Fluorescent N-doped carbon dots (CN-dots) covalently functionalized with carboxylatopillar[5]arene (CP[5]), namely CCDs, have been prepared the first time. Compared with CN-dots without pillarene units, the newly constructed fluorescent CCDs could recognize Fe3+ with high selectivity. Therefore, such CCDs can potentially serve as a promising chemical sensor for Fe3+ ions.

Bifunctional Carbon Dots Derived From an Anaerobic Bacterium of Porphyromonas gingivalis for Selective Detection of Fe3+ and Bioimaging

“…As demonstrated in Fig. 5d, the red shift in the absorption spectrum of Pg‐CDs was captured in the presence of Fe 3+ , its peak overlaying with the emission peak of Pg‐CD and Fe 3+ , indicating the occurrence of energy transfer between Fe 3+ and Pg‐CDs, consequently leading to the FL quenching (32). S and N two dopants endowed the prepared Pg‐CDs with abundant functional groups including some chelating groups, such as hydroxyl and amine groups, which could interact easily with Fe 3+ ions.…”

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

“…Figure 21 depicts the functionalization of N-CDs with carboxylatopillar [5]arene (CP [5]) via covalent interaction to obtain CP [5]-CDs for the development of a fluorescence sensor for Fe 3+ ions detection [268]. Upon the addition of Fe 3+ ions to CP [5]-CDs, the Fe 3+ ions resulted into the reduction in the fluorescence intensity of CP [5]-CDs nanohybrid, thereby led to the quenching of fluorescence.…”

“…Upon the addition of Fe 3+ ions to CP [5]-CDs, the Fe 3+ ions resulted into the reduction in the fluorescence intensity of CP [5]-CDs nanohybrid, thereby led to the quenching of fluorescence. The fluorescence spectra displayed a linear calibration plot from 0 to 190 µM of Fe 3+ concentration, and the sensor could demonstrate an LOD value of 1.2 µM [268]. Additionally, Table 2 lists a few important features of various other CDs-based fluorescence sensors.…”

Functional Materials with Pillarene Struts

“…In our further work, we covalently attached CP [5]A rings to the surface of carbon dots, and the resulting hybrids exhibited an obvious fluorescence quenching effect only toward Fe 3+ compared with individual carbon dots without CP [5]A modifiers, suggesting the high selectivity of a promising fluorescent sensor for Fe 3+ identification. 42 In 2015, we covalently attached CP [5]A to the surface of reduced graphene oxide nanosheets to develop a hybrid fluorescent probe with better water dispersibility and investigated the fluorescence-quenching property for organic dye molecules in aqueous solutions (Figure 5d). 43 The fluorescence intensity of rhodamine 6G or neutral red was remarkably quenched by the FRET or photoinduced charge A to give magnetic hybrid CP5-MNPs via a one-pot solvothermal method, which displayed excellent adsorption performance, ultrafast adsorption efficiency, and good recyclability toward organic cationic dyes for their rapid removal as well as magnetic solid-phase extraction for the determination of trace pesticides in beverage samples (Figure 6).…”