A new disulfide Schiff base as a versatile “OFF–ON–OFF” fluorescent–colorimetric chemosensor for sequential detection of CN⁻ and Fe³⁺ ions: combined experimental and theoretical studies

Abstract

A new disulfide Schiff base as a versatile “OFF–ON–OFF” fluorescent–colorimetric chemosensor has been synthesized for sequential detection of CN− and Fe3+ ions.

Gelation-induced enhanced emission active stimuli-responsive low-molecular-weight organogelator: dual-channel recognition of cyanide from water and food samples with superhydrophobic surface formation

“…Consequently, the pyrene unit in [CN1–CN − ] lost its electron-donating character, which led to the gradual upfield shift of the aromatic protons (Table S6, ESI†) at elevated [CN − ]. 17,61 The formation of the [CN1–CN − ] adduct was further supported from the appearance of a resonance signal at 51.93 ppm (Fig. S34, ESI†), as confirmed from the 13 C NMR study of CN1 in the presence of CN − , and the appearance of the peak at m / z 400.0940 from the HRMS results (Fig.…”

“…14,15 In spite of its tremendous applications in industrial fields (viz., metallurgy, tanning, herbicides, gold extraction, electroplating and so on), the accidental release of CN À , mostly via industrial waste water followed by its interaction with mammalian bodies via oral exposure, dermal exposure or inhalation, can cause serious signs of damage in the form of vomiting, convulsions, and disruption of the respiratory system owing to its binding with iron (Fe 3+ ) in metalloenzymes, which ultimately leads to death, even within a few minutes. [16][17][18] In addition, more than 1000 kinds of plants, food crop species (sprouted potatoes, apples and bitter seeds, almonds, etc.) are known to contain CN À in the form of cyanogenic glycoside, where their direct consumption results severe neurological diseases as a result of the toxification of HCN through hydrolysis of the cyanogenic glycosides.…”

Versatile Triple-Output Molecular Logic Gate for Cysteine and Silver (I) in Foods and the Environment Based on I-Motif DNA Modulation

“…As one of the critical factors, signal outputs played a significant role in the construction of a molecular logic gate. So far, various detection techniques including colorimetry, electrochemistry, electrochemiluminescence, and fluorescence are often used as output signals for the molecular logic gate system. − Among them, fluorescence spectrometry has the greatest interest in the molecular logic gate because of its simplicity, low cost, extra sensitivity, and specificity, and it has also been proven as a potentially powerful technique for the outputs of molecular logic gates having the conformation switch of the functional DNA. , More important, more parameters are available in the fluorescence technique such as fluorescence intensity, wavelength, anisotropy, and decay, which provide more options for the multisignal outputs in the construction of the molecular logic gate. Superior to the single-signal output mode, multifunctional and integrated molecular logic gates have potential advantages in improving the reliability and sensitivity of output results.…”

A fluorescent polyurethane foam based on rhodamine derivative as Fe(III) sensor in pure water

“…Hence, they might be not conducive to achieving efficient and convenient detection targets in terms of sampling volume, detection time and operation complexity. Based on this, significant interest has been directed to the development of fluorescent chemical sensor technology, characterized by low cost, good selectivity, simple operation and low sampling consumption 17–19 . For instance, Zhu et al 20 .…”