A novel self-assembled supramolecular sensor based on thiophene-functionalized imidazophenazine for dual-channel detection of Ag⁺ in an aqueous solution

Abstract

A novel dual-channel chemosensor S1 is designed and synthesized, which recognizes Ag+ over other metal ions with high selectivity and sensitivity.

A pH‐Activatable Prodrug and Metal Prodrug Conjugate of Gossypol: Synthesis, Emergent Photophysical, Nanoscopic, Computational, and in‐Vitro Cellular Studies

“…Upon complexation with Zn 2+ , the FMOs are elevated in energy, effectively reducing the band gap to 2.18 eV, see Figure S40 for the Zn(GD) 2 complex. Hence, the band gap gets reduced upon coordination further supports the metal ion‐driven molecular confinement in the complexes, resulting in fluorescence quenching [20] …”

“…Hence, the band gap gets reduced upon coordination further supports the metal ion-driven molecular confinement in the complexes, resulting in fluorescence quenching. [20] Among the 30 excited states, Table 1 lists those that significantly contribute to the transition. In the gossyzid monomer, S0!S1, S0!S2, and S0!S3 transitions are apparent, with oscillator strengths: 0.1137, 0.1894, and 0.1032, and excitation energies: 2.74, 2.79, and 2.83 eV, respectively.…”

A Comprehensive Review on Thiophene Based Chemosensors

“…The sensor reacted with a color change from yellow to light purple upon introducing Ag + ions in DMSO/Water solution, accompanied by a redshift to 376 nm. Moreover from the fluorescence emission spectra, it was also noticed that the fluorescence intensity of the peak at 547 nm abruptly decreased with the addition of the Ag + to the solution, confirming the selective sensing and detection of Ag + ions over other interfering metal ions [ 70 ] ( Scheme 27 ) . Moreover, the ‘on-off’ mechanism was evaluated by the addition of I − ions to test the reversibility of the sensing mechanism, and was observed that the sensor could be considered an excellent on-off fluorescence sensor, which was evident by the alternating reviving and quenching processes in the fluorescence emission of the sensor 29 -Ag + solution with 2:1 binding stoichiometry.…”

Oxalohydrazide‐Based Chemosensor for Detection of Cu2+/Fe3+ Ions and Its Application in Live Cell Imaging

“…The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of OX(HA) 2 and (OX(HA) 2 -Cu 2 + or (OX(HA) 2 -Fe 3 + complexes were calculated to determine the HOMO-LUMO energy and their energy gap (ΔE). [66,67] The energy gap for the interaction with metal ions was observed to increase 8.64 eV for OX(HA) 2 -Cu 2 + and 5.4 eV for OX(HA) 2 -Fe 3 + complex respectively, with the ΔE value for the receptor being 5.97 eV (Figure 13). It is implied that electron density at LUMO is situated over the carbonyl and azide group of oxalohydrazide, the electron density at HOMO is dispersed over the phenyl ring of OX(HA) 2 .…”