Self-agglomerated crystalline needles harnessing ESIPT and AIEE features for the ‘turn-on’ fluorescence detection of Al³⁺ ions

Abstract

We report the synthesis of probe 2 for the fluorescence “turn-on” detection of Al3+ ions in CH3OH.

Multistimuli-Responsive Fluorescent Organogelator Based on Triphenylamine-Substituted Acylhydrazone Derivative

“…The UV−vis absorption spectra were determined on a Shimadzu UV-2550 spectrometer, and photoluminescence was measured on a Perkin-Elmer LS 55 spectrometer. The room-temperature luminescence quantum yields in solutions were determined relative to quinine sulfate in sulfuric acid aqueous solution (0.546), and calculated according to the following equation: Φ unk = Φ std (I unk /A unk )(A std /I std )(η unk /η std ) 2 , where Φ unk is the radiative quantum yield of the sample; Φ std is the radiative quantum yield of the standard; I unk and I std are the integrated emission intensities of the sample and the standard, respectively; A unk and A std are the absorptions of the sample and the standard at the excitation wavelength, respectively; and η unk and η std are the indexes of the refraction of the sample and standard solutions (pure solvents were assumed), respectively. The thermal properties of the samples were investigated with a TA Q20 DSC instrument.…”

“…In recent years, stimuli-responsive luminescent materials have attracted widespread attention due to their potential applications in sensors, data storage, optical devices, drug delivery, cell imaging, etc. − Among these materials, the fluorescent low-molecular-weight organogelators with the stimuli-responsive property have attracted the special interest of researchers. − This is because the supramolecular structures formed by the fluorescent low-molecular-weight organogelators through noncovalent bonds (such as hydrogen bonds, π–π interactions, van der Waals forces, etc.) can produce obvious responses to external stimuli and have multichannel response characteristics including fluorescence change, color variation, phase transition, etc. − …”

Fluorescent Schiff base sensors as a versatile tool for metal ion detection: strategies, mechanistic insights, and applications

“…48,49 Puri et al developed Schiff base sensor 10 with AIE properties for fluorescence-based detection of Al 3+ in methanol solution. 79 On excitation at 360 nm, sensor 10 displayed emission at 548 nm accompanied by a large Stokes shift (188 nm), attributed to the ESIPT phenomena. Upon addition of Al 3+ to the solution of sensor 10, further enhancement in emission intensity was observed with emission maxima at 476 nm and a Stokes shift of 116 nm, attributed to metal-template aggregation (Fig.…”

Revelation of ESIPT mechanism for the novel fluorescent system HNIBT in toluene and methanol solvents: A TDDFT study

“…That is to say, the distinct red-shift phenomena of hydroxyl stretching vibration should be attributed to the enhanced excited-state intramolecular hydrogen bond O1 H2ÁÁÁN3 for both HNIBT-enol and HNIBT-MeOH-enol. [12,[53][54][55][56][57][58][59][60][61]…”