A family of highly selective fluorescent sensors for fluoride based on excited state proton transfer mechanism

Pyrene Based Chemosensor for Selective Sensing of Fluoride in Aprotic and Protic Environment

“…Various pyrene systems capable of showing the metal-induced excimer enhancement or quenching have been reported earlier [11,12]. Taking into account our interest in the development of sensors for anions and inspired by our previous work on the use of hydrazones [13], we report herein the synthesis and characterization of new heteroaromatic conjugated system consisting of pyridyl-N, imine-N and pyrene ring. This sensor was investigated as a chemosensor for fluoride in aprotic medium and its insitu prepared iron(III) complex was utilized as fluoride sensor in aqueous medium.…”

A reversible fluorescence “off–on–off” sensor for sequential detection of aluminum and acetate/fluoride ions

“…From the fluorescence titration spectral pattern, the detection limit of AcO − and F − was found to be 4.of the applicability and analytical part of the present probes with some of the previous reports on the AcO − /F − optical sensors in terms of their binding constant, limit of detection, sensing ions, response time and effect of selectivity towards AcO − /F − ions in the presence of other interfering anions was given inTable 1. However, the response time of the sensors for AcO − /F − generally is fast compared to other and detection limit were also comparable with no interference[51][52][53][54][55][56][57][58].Reversibility and regeneration of sensing probe are important factors in practical applications. As shown in Fig.…”

Synthesis, structure and sensing behavior of hydrazone based chromogenic chemosensors for Cu2+ in aqueous environment

“…The association constants (K) were calculated by the linear Benesi-Hildebrand equation from UV-Vis (Eq. (1)) studies [8,9],…”

“…They can also undergo selective chromogenic reactions with several heavy and transition metal (HTM) ions affording complexes with special electronic, magnetic, redox, ion exchange and cytotoxic activities [5]. Some earlier reported hydrazones also provide an interesting tool for fluorometric detection of different species including Cu 2+ , Al 3+ , H + , F À etc [6][7][8][9]. The preference and versatility of hydrazone functional group can be attributed to its ease of synthesis, stability towards hydrolysis and most importantly the flexible nature of AHNAN@CHA bonds through tautomerism, which enable its integration in different applications [5,10].…”