Probing the structural features and the micro-heterogeneity of various deep eutectic solvents and their water dilutions by the photophysical behaviour of two fluorophores

Tiecco, Marcello; Guida, Irene Di; Gentili, Pier Luigi; Germani, Raimondo; Bonaccorso, Carmela; Cesaretti, Alessio

doi:10.1016/j.molliq.2021.115718

Cited by 7 publications

(3 citation statements)

References 75 publications

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“…Fluorescence lifetimes were determined by applying the least-squares and the maximum entropy methods (MEM) 64,65 on the TC-SPC fluorescence kinetics (Tables S2 for more details about fuzzy entropy and the MEM algorithm). 47 Lifetimes became shorter upon increasing the amount of W due to the enhanced medium polarity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Fluorescence lifetimes were determined by applying the least-squares and the maximum entropy methods (MEM) , on the TC-SPC fluorescence kinetics (Tables S2–S5) for the fluorophores investigated in THF/W mixtures of different compositions and in thin films. The fluorescence decay kinetics and the detailed MEM results for the representative case of NPI-PTZ(dioxy)-NPI are shown in Figure A,C, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Aggregation-Induced Emission in Phenothiazine-Based Fluorophores: An Insight into the Excited State and Aggregate Formation Mechanism

et al. 2022

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In this study, we report evidence for emissive aggregates of push−pull phenothiazine and phenothiazine dioxide derivatives produced both in water dispersions and in the solid state, highly promising for applications in both biology and material science. An insightful investigation of the aggregation-induced emission (AIE) mechanism was carried out via time-resolved spectroscopies, with nanosecond and femtosecond temporal resolution, coupled with advanced data analysis. Our steady-state and timeresolved spectroscopic results unambiguously show that a significant AIE behavior is activated by the restriction of intramolecular rotations for the phenothiazine derivatives. Investigation of the nonlinear optical properties also revealed that aggregates exhibit notable emission upon two-photon excitation. In particular, the phenothiazine dioxide-based aggregates exhibit remarkable fluorescence efficiencies and large two-photon absorption cross sections, as well as the capability to be internalized in HeLa cells exerting no cytotoxic effect. These aggregate species thus prove to be promising as novel fluorophores for bioimaging.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Aggregation-Induced Emission in Phenothiazine-Based Fluorophores: An Insight into the Excited State and Aggregate Formation Mechanism

et al. 2022

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“…The second example refers to another fluorescent N-methylpyridinium iodide, i.e., 2–4-(diphenylamino)phenyl-ethenyl-1-methylpyridinium iodide (PyI) used to probe the effect of water into the microheterogeneity of a Deep Eutectic Solvent (DES), which is made of phenylacetic acid (PhAA) and N,N,N,N-dimethyldidodecylammonium chloride (dMdDNCl) mixed in 2:1 M ratio ( Tiecco et al, 2021 ). Figure 2B reports the fluorescent lifetimes’ distribution for PyI dissolved in PhAA/dMdDNCl and determined after addition of different amounts of water.…”

Section: Definition Of Fuzzy Entropymentioning

confidence: 99%

Quantitative estimation of chemical microheterogeneity through the determination of fuzzy entropy

Gentili

Pérez–Mercader

2022

Front. Chem.

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Chemical micro-heterogeneity is an attribute of all living systems and most of the soft and crystalline materials. Its characterization requires a plethora of techniques. This work proposes a strategy for quantifying the degree of chemical micro-heterogeneity. First of all, our approach needs the collection of time-evolving signals that can be fitted through poly-exponential functions. The best fit is determined through the Maximum Entropy Method. The pre-exponential terms of the poly-exponential fitting function are used to estimate Fuzzy Entropy. Related to the possibility of implementing Fuzzy sets through the micro-heterogeneity of chemical systems. Fuzzy Entropy becomes a quantitative estimation of the Fuzzy Information that can be processed through micro-heterogeneous chemical systems. We conclude that our definition of Fuzzy Entropy can be extended to other kinds of data, such as morphological and structural distributions, spectroscopic bands and chromatographic peaks. The chemical implementation of Fuzzy sets and Fuzzy logic will promote the development of Chemical Artificial Intelligence.

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Theoretical and experimental evidence for the use of natural deep eutectic solvents to increase the solubility and extractability of curcumin

Alioui¹,

Sobhi²,

Tiecco³

et al. 2022

Journal of Molecular Liquids

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Probing the structural features and the micro-heterogeneity of various deep eutectic solvents and their water dilutions by the photophysical behaviour of two fluorophores

Cited by 7 publications

References 75 publications

Aggregation-Induced Emission in Phenothiazine-Based Fluorophores: An Insight into the Excited State and Aggregate Formation Mechanism

Aggregation-Induced Emission in Phenothiazine-Based Fluorophores: An Insight into the Excited State and Aggregate Formation Mechanism

Quantitative estimation of chemical microheterogeneity through the determination of fuzzy entropy

Theoretical and experimental evidence for the use of natural deep eutectic solvents to increase the solubility and extractability of curcumin

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