A novel fluorescent sensor based on 4-(diethylamino)-2-(hydroxy)-phenyl imine functionalized naphthalimide for highly selective and sensitive detection of CN^– and Fe³⁺

Abstract

In this work, a novel sensor molecule HB1, based on a 4-(diethylamino)-2-(hydroxy)-phenyl imine functionalized naphthalimide derivative, was successfully designed and synthesized. Interestingly, the HB1 showed fluorescence identification ability for CN– in DMSO/H2O (8:2, v/v) solution. After addition of CN– into the HB1 solution, the fluorescence intensity of HB1 solution could be enhanced obviously. The anti-disturbance experiments demonstrated that other anions could not interfere in the detection of CN–. On the other hand, HB1 was capable of dual-channel (absorption and fluorescence) detection of Fe3+ in DMSO solution. With the addition of various metal ions into the HB1 solution, only Fe3+ induced the fluorescence emission of HB1 solution quenching and the colour change, and other metal ions could not interfere in the detection of Fe3+. The limits of detection (LODs) of HB1 for CN– and Fe3+ were 6.30 × 10−8 and 3.95 × 10−8 mol/L, respectively. Importantly, the real sample experiment was carried out by detecting CN– in bitter almonds. Additionally, ion test strips based on HB1 were fabricated, which could act as convenient and efficient test kits for detecting CN– and Fe3+.

A new cholesterol-naphthalimide conjugate: aggregation and sensing of CN− and CO2 under different conditions

“…It is further pointed out that naphthalimide with amine substituent at the 4-position is well established as a fluorescent probe for its involvement in the internal charge transfer phenomenon. 25 Before examining the interaction in fluorescence, the quantum yield 26 of 1 ( Φ F = 0.31) was determined in DMF. Emission changes on excitation at 460 nm were only noted with CN − , F − , AcO − , and H 2 PO 4 − .…”

Metal-ion-mediated synergistic coordination: construction of AIE-metallogel sensor arrays for anions and amino acids

“…What's more is that the lowest detection limits of supramolecular OGMs for I − , N 3 − , CN − , L-Trp and L-His are much lower than those of the reported chemosensors for these anions and l -amino acids (Table 1 and Table S2, ESI†), which indicated that these five OGMs are capable of detecting target anions and l -amino acids sensitively. 47–66…”

“…What's more is that the lowest detection limits of supramolecular OGMs for I À , N 3 À , CN À , L-Trp and L-His are much lower than those of the reported chemosensors for these anions and L-amino acids (Table 1 and Table S2, ESI †), which indicated that these five OGMs are capable of detecting target anions and L-amino acids sensitively. [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] To further exploit the practical application of these OGMs (including OGFe, OGCa, OGCu, OGCo and OGNi), the fluorescent display films based on OGMs were prepared by pouring a heated cyclohexanol solution of the OGMs on a clean glass surface and drying in air. These metallogel films show bright blue fluorescence emission under 365 nm UV light (Fig.…”

Copper nanoclusters with/without salicylaldehyde-modulation for multifunctional detection of mercury, cobalt, nitrite and cyanide ions in aqueous solution and bioimaging

“…-NO 2 [20][21][22][23], and CN − [24][25][26][27][28][29]. Although these sensors show great potential for ion sensing, their practical application is limited by drawbacks such as intrinsic toxicity, optical instability, water insolubility, and susceptibility to interference, especially those developed for the detection of CN − .…”