Metal ion dependent “ON” intramolecular charge transfer (ICT) and “OFF” normal switching of the fluorescence: Sensing of Zn2+ by ICT emission in living cells

Water soluble and efficient amino acid Schiff base receptor for reversible fluorescence turn-on detection of Zn2+ ions: Quantum chemical calculations and detection of bacteria

“…The absorption spectra were recorded at room temperature using a Shimadzu-2450 UV-vis spectrophotometer using quartz cell with 1 cm path length. The emission spectra were recorded using a JASCO spectrometer at a scan rate of 1000 nm/min and slit width with Ex: 5 nm A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 5 The receptor R was synthesized as reported in our earlier work [24]. Sodium salt of Ltryptophan was prepared by stirring L-tryptophan (0.1 g, 1 mmol) in methanol with a methanolic solution of NaOH (0.019 g, 1 mmol).…”

“…The investigation on fluorescent sensing of metal ions is promising because heavy metals play crucial roles in ecological, biological, and clinical applications [1][2][3][4][5]. In biological systems, zinc(II) is the second most abundant transition metal only next to iron [6,7].…”

Fluorescent benzimidazo[1,2-a]quinolines: synthesis, spectroscopic and computational studies of protonation equilibria and metal ion sensitivity

“…One of the most extensively studied classes of organic fluorescent sensors is that based on heterocyclic compounds, 20,21 which have excellent spectroscopic properties and selectively bind to essential cations and anions. Thus, they can be employed as sensitive and selective optical sensors in a wide range of biological, environmental, and chemical processes.…”

Synthesis, chemosensing properties and logic behaviour of a novel ratiometric 1,8-naphthalimide probe based on ICT and PET

“…During excitation of the system the fluorophore undergoes donor-acceptor intramolecular charge transfer which strongly depends on the microenvironment of the fluorophore. Thus, recognition of a guest affects the ICT efficiency 4 that changes the energy between ground and excited state and results in shifting of the fluorophore electronic spectra [30][31][32]. The attractiveness of the ICT sensors lies on their twochannel output signals -colour change and fluorescence variation allowing the possibility to design a ratiometric fluorescent probes [33][34][35][36].…”