Solvatochromic behavior of 1-(p-dimethylaminophenyl)-2-nitroethylene in 24 binary solvent mixtures composed of amides and hydroxylic solvents

Giusti, Luciano A.; Marini, Vanderléia Gava; Machado, Vanderlei G.

doi:10.1016/j.molliq.2009.09.002

Cited by 23 publications

(5 citation statements)

References 54 publications

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“…All of NFM + alcohols mixtures show the synergy in hydrogen bond basicity. Synergism occurs when two pure solvents form hydrogen-bonding complexes that show different polarity compared to the pure solvents. − The negative deviation of β reveals that hydrogen-bonding complexes formed by interactions between NFM and alcohols have lower β than two pure solvents.…”

Section: Resultsmentioning

confidence: 99%

Solvatochromic Measurement of KAT Parameters and Modeling Preferential Solvation in Green Potential Binary Mixtures of N-Formylmorpholine with Water, Alcohols, and Ethyl Acetate

2020

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Kamlet−Abboud−Taft (KAT) solvatochromic parameters (α, β, and π*), as well as the Reichardt's polarity scale (E T (30)), were measured from ultraviolet−visible (UV−vis) absorption spectral shift of three indicator solutes namely 4nitroaniline, N,N-dimethyl-p-nitroaniline, and the betaine dye 4-(2,4,6-triphenylpyridinium-1-yl)-2,6-diphenylphenolate. These measurements were done within the whole mole fraction range of the binary mixture of green solvents N-formylmorpholine with water, ethanol, 1-propanol, 2-propanol, 1-butanol, and ethyl acetate at room temperature (298.15 ± 0.1 K). The Redlich−Kister model was employed to demonstrate the effect of solvent composition on the solvatochromic parameters obtained in the mixtures understudy. The data of E T obtained for the indicator dyes in different mole fractions (0.0−1.0) of the binary mixtures were analyzed to investigate their preferential solvation in terms of both the solute−solvent and the solvent−solvent interactions. The solvent exchange model was successfully utilized to calculate preferential solvation parameters. It was found that the solvation shell of the dyes is mainly affected by the solvent−solvent interactions, and all studied systems showed the nonideal behavior.

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Section: Resultsmentioning

confidence: 99%

Solvatochromic Measurement of KAT Parameters and Modeling Preferential Solvation in Green Potential Binary Mixtures of N-Formylmorpholine with Water, Alcohols, and Ethyl Acetate

2020

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“…PL quenching in carbon dots with the above characteristics is typically explained by either electron or energy transfer between the fluorophore (i.e, the carbon dots) and the quencher (i.e., the silica NPs) [16]. The carbon dots used in the present study are hydrochromic, via hydrogen bonding and vibronic coupling with the surrounding water molecules [34,48,49]. Furthermore, silica NPs possess OH groups on their surface, typical of silanols that are known to engage in hydrogen bonding.…”

Section: Detection Of Nanomaterialsmentioning

confidence: 99%

Paper Sensors Based on Fluorescence Changes of Carbon Nanodots for Optical Detection of Nanomaterials

et al. 2021

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A paper sensor was designed in order to detect the presence of nanomaterials, such as ZnO and silica nanoparticles, as well as graphene nanoplatelets (GnP), based on fluorescence changes of carbon nanodots. Paper strips were functionalized with carbon nanodots using polyvinyl alcohol (PVA) as binder. The carbon nanodots were highly fluorescent and, hence, rendered the (cellulosic) paper stripes emissive. In the presence of silica and ZnO nanoparticles, the fluorescence emission of the carbon nanodots was quenched and the emission decay was shortened, whereas in the presence of GnP only emission quenching occurred. These different photoluminescence (PL) quenching mechanisms, which are evident from lifetime measurements, convey selectivity to the sensor. The change in fluorescence of the carbon dot-functionalized paper is also evident to the naked eye under illumination with a UV lamp, which enables easy detection of the nanomaterials. The sensor was able to detect the nanomaterials upon direct contact, either by dipping it in their aqueous dispersions, or by sweeping it over their powders. The use of the proposed optical sensor permits the detection of nanomaterials in a straightforward manner, opening new ways for the development of optical sensors for practical applications.

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“…The proposed framework (eq ) was applied to estimate the λ m values of nonaqueous mixtures for three solvatochromic indicators − that do not have specific hydrogen-bonding interactions (entries 1–3, Table S15 and Figure S20) and for one solvatochromic indicator (4-nitroaniline) having specific hydrogen-bonding interactions from amine (NH 2 ) functional groups (entry 4, Table S15 and Figure S21). The proposed framework (eq ) provided reliable λ m values (entries 1–3, Table S15 and Figure S20) and could represent the trends of the data for indicators that do not have specific hydrogen-bonding interactions.…”

Section: Resultsmentioning

confidence: 99%

Predictive Framework for Estimating Dipolarity/Polarizability of Binary Nonpolar–Polar Mixtures with Relative Normalized Absorption Wavelength and Gas-Phase Dipole Moment

Duereh

Guo

Satō

et al. 2019

Ind. Eng. Chem. Res.

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A predictive framework is proposed for estimating the dipolarity/polarizability (π*) values of binary mixtures via the relative normalized maximum absorption wavelength (Δλ mix N ) of an indicator (N,N-dimethyl-4-nitroaniline) in the pure liquids and the pure component gas-phase dipole moments (μ). New spectroscopic measurements of 13 nonpolar (1)−polar (2) liquid mixtures are reported and local composition was used to correlate variations of Δλ mix N values with mole fraction, x 2 . The resulting multivariate linear relationship in x 2 and μ allowed data correlation and was applied to prediction of π* of (i) ten additional nonpolar−polar mixtures at temperatures of (15 to 45) °C, (ii) nine polar−polar mixtures, (iii) six CO 2 -expanded solvent mixtures, and (iv) five molecular solvent−ionic liquid mixtures and was found to give an overall deviation of 8.9% in π*. The predictive framework was applied to the dipolarity/polarizability scales of Effenberger−Wurthner and Catalań for 16 polar−polar liquid mixtures and was found to give a maximum deviation of 9.6%. The predictive framework is widely applicable to chemical systems and requires only pure component π* and gas-phase dipole moment values to estimate the dipolarity/ polarizability of solvent mixtures.

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Solvatochromic behavior of 1-(p-dimethylaminophenyl)-2-nitroethylene in 24 binary solvent mixtures composed of amides and hydroxylic solvents

Cited by 23 publications

References 54 publications

Solvatochromic Measurement of KAT Parameters and Modeling Preferential Solvation in Green Potential Binary Mixtures of N-Formylmorpholine with Water, Alcohols, and Ethyl Acetate

Solvatochromic Measurement of KAT Parameters and Modeling Preferential Solvation in Green Potential Binary Mixtures of N-Formylmorpholine with Water, Alcohols, and Ethyl Acetate

Paper Sensors Based on Fluorescence Changes of Carbon Nanodots for Optical Detection of Nanomaterials

Predictive Framework for Estimating Dipolarity/Polarizability of Binary Nonpolar–Polar Mixtures with Relative Normalized Absorption Wavelength and Gas-Phase Dipole Moment

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