Selective Fluorescence Quenching in Cationic Fluorene‐Thiophene Diblock Copolymers for Ratiometric Sensing of Anions

Abstract

718typically around 1 × 10 − 5 M . The aggregation of these diblock copolymers may depend on concentration, [ 32 ] which may also affect the quenching behavior. Future studies will be directed to test this effect.

Anion Recognition in Water: Recent Advances from a Supramolecular and Macromolecular Perspective

“…Conversely, poly(thiophene) decorated with pendant quaternary ammonium groups (Figure 13 c) disaggregates in water in the presence of iodide and sulfonate‐based surfactants to give a red‐to‐yellow color change with a sensitivity down to the nanomolar regime 94. Poly(fluorene‐ b ‐thiophene) has also been functionalized with tertiary ammonium groups on the thiophene block (Figure 13 d), and the fluorescence of that section was found to quench with halides in water (Cl − >Br − >I − ), although no change of aggregation state was observed in this case 95. By using the constant fluorescence of the poly(fluorene) block, it was possible to measure DNA concentrations down to the sub‐micromolar level.…”

25th Anniversary Article: No Assembly Required: Recent Advances in Fully Conjugated Block Copolymers

“…Both palladium catalyzed Stille and Suzuki–Miyaura coupling reactions have been utilized; however, the majority of examples in the literature exploit Suzuki–Miyaura polymerization of bifunctional fluorene monomers bearing one boronic ester and one aryl bromide functional group. The block copolymers prepared by these strategies have been well characterized in terms of their self‐assembly behavior and have found applications as sensors and in optoelectronic devices as both active materials and interlayers.…”

Functionalized polythiophenes: Recognition materials for chemosensors and biosensors of superior sensitivity, selectivity, and detectability

“…Another report described utilization of cationic PTs for DNA [145] and microRNA sensing [146], in which PTs worked as the transducer. Electrostatic interactions between cationic PTs with ssDNA led to quenching the PTs fluorescence ( Figure 5).…”

“…Do Not Type: [145], [143], [144], [17], [146], [147], [151] Moreover, adsorption or interaction of biocompounds with a Au surface changes the refractive index, enabling SPR transduction. Various reports described the use of this transduction to devise biosensing systems.…”