ESIPT based Hg²⁺and fluoride chemosensor for sensitive and selective ‘turn on’ red signal and cell imaging

Abstract

Excited state intramolecular proton transfer (ESIPT) enabled fluorescent sensor phenanthroline diimino phenol (PDP) for Hg 2+ has been designed and synthesized. PDP which acts as a dual sensor selectively detects only Hg 2+ in mixed aqueous medium and fluoride in acetonitrile medium over other competing metal ions and anions. Binding of PDP with Hg 2+ is supported by DFT. ESIPT phenomenon in PDP is

A Highly Selective “On‐Off‐On” Optical Switch for Sequential Detection of Cu2+and S2−Ions Based on 2, 6‐Diformyl‐4‐methyl Phenol and Catecholase Activity by Its Copper Complex

“…Initially, the receptor HL exhibited strong photoluminescence near 595 nm on excitation at 400 nm (quantum yield (Φ) ca.0.090). The peak at 595 nm is arises due to the excited state intramolecular proton transfer (ESIPT) followed by excited state intramolecular charge transfer (ESICT) from the phenol ‐OH to the imine nitrogen atom (Scheme ) which underwent change to the different extents during titration with various metal ions (c=1.5×10 −3 M).…”

A colorimetric chemosensor for the sequential recognition of Mercury (II) and iodide in aqueous media

“…Moreover, mercury ions can cause abnormal problems at human body due to their easy absorption through the skin, respiratory and cell membranes, leading to digestive, cardiac, kidney and DNA damage [3]. Therefore, the detection and control of mercury is important for human health and environmental protection [4]. On the other hand, iodide is a very essential microelement for humans because it plays an important role in biological activities such as brain function, cell growth, neurological activity and thyroid function [5].…”

Design and synthesis of stable indigo polymer semiconductors for organic field-effect transistors with high fluoride sensitivity and selectivity

“…Other uoride sensors under development are colorimetric or uorescence-based optical chemosensors in which the qualitative and quantitative analyses of uoride ions are achieved with a UV-Vis spectrophotometer or a uorimeter. The mechanisms of these optical uoride sensors involve the interactions between the uoride ion and the sensing chromophore, which affect the intramolecular charge transfer (ICT) or excited state intramolecular proton transfer (ESIPT) of hydrogen-bonds, [7][8][9][10][11][12] cleavage of silicon-oxygen or silicon-carbon bonds and binding of uoride to amides, [13][14][15][16][17] p-p interactions, 18 and aggregation of nanoparticles. [19][20][21][22][23] Printed organic eld-effect transistors (OFETs) based on small molecule or polymer semiconductors have drawn much attention in recent years because of their low fabrication cost, excellent substrate conformity, high mechanical robustness and versatile function tunability of the organic semiconductors.…”

“…We are particularly interested in the intramolecular hydrogen bonds between the N-H and C]O groups of the two vinylogous amides of indigo, N-H/O]C, which may preferentially interact with uoride ions. [7][8][9][10][11][12] In this work, we prepared two novel indigo donor-acceptor (D-A) polymers, PIDG-T-C20 and PIDG-BT-C20 (Scheme 1), comprising the hydrogen-bondcontaining indigo as the acceptor building block and thiophene (T) or bithiophene (BT) as the donor building block, respectively. PIDG-T-C20 and PIDG-BT-C20 exhibited p-type semiconductor performance when used as the active layer in bottom-gate-bottom-contact (BGBC) OFETs, achieving hole mobilities of up to 0.016 and 0.028 cm 2 V À1 s À1 , respectively, which are so far the highest values reported for indigo-based polymers.…”