Identification of overtone and combination bands of organic solvents by thermal lens spectroscopy with tunable Ti:sapphire laser excitation

Ventura, Maurizio; Silva, J.R.; Catunda, T.; Andrade, L.H.C.; Lima, S.M.

doi:10.1016/j.molliq.2021.115414

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…The method is used in finding the luminescence quantum yields [ 18 , 19 ]. A broad selection of lasers allows TLS to solve research problems using UV/vis [ 20 ] and IR ranges [ 21 , 22 , 23 ]. The high sensitivity of TLS to the sample composition made it possible to study the effect of electrolytes and organic solvents on the polarizability of water molecules [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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Thermal-lens spectrometry is a sensitive technique for determination of physicochemical properties and thermophysical parameters of various materials including heterogeneous systems and nanoparticles. In this paper, we consider the issues of the correctness (trueness) of measurements of the characteristic time of the thermal-lens effect and, thus, of the thermal diffusivity determined by dual-beam mode-mismatching thermal lensing. As sources of systematic errors, major factors—radiation sources, sample-cell and detector parameters, and general measurement parameters—are considered using several configurations of the thermal-lens setups, and their contributions are quantified or estimated. Furthermore, with aqueous ferroin and Sudan I in ethanol as inert colorants, the effects of the intermolecular distance of the absorbing substance on the correctness of finding the thermophysical parameters are considered. The recommendations for checking the operation of the thermal-lens setup to ensure the maximum accuracy are given. The results obtained help reducing the impact of each investigated factor on the value of systematic error and correctly measure the thermophysical parameters using thermal-lens spectrometry.

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Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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“…Thermal lens spectroscopy is a widely used tool for understanding thermo-optical properties (Chakraborty et al, 2021;Singhal & Goswami, 2020;Jiménez-Pérez et al, 2016a;Jiménez-Pérez et al, 2016b;Oliveira et al, 2020), Nonlinear optical properties (Ventura et al, 2021;Rodriguez & Chiesa, 2011), trace analysis (Shokoufi & Hamdamali, 2010), photochemical reactions (Herculano et al, 2011;Astrath et al, 2009), molecular isomerism (Kumar, Dinda & Goswami, 2014), distinguishing isotopes (Bhattacharyya, Kumar & Goswami, 2014), etc. This spectroscopic tool has already been used to learn about the structural information of molecules (Mikheev et al, 2016; and intermolecular interactions (Chakraborty, Rawat & Goswami, 2019;Bhattacharyya, Kumar & Goswami, 2011).…”

Section: Introductionmentioning

confidence: 99%

Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Chakraborty

Rawat

Mishra

et al. 2023

PeerJ Analytical Chemistry

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Using femtosecond-pulse-induced thermal lens spectroscopy (FTLS), we report a novel method for the quality measurements of alcohol-based hand sanitizers (ABHS). To sustain its effectiveness, the ABHS must contain the recommended concentration of alcohol content. We diluted the hand sanitizer with water to reduce the quantity of alcohol in the mixture and then performed thermal measurements on it. We performed both dual-beam Z-scan and time-resolved TL measurements to identify the alcoholic content in the ABHS. The thermal lens (TL) signal of the solvent is capable of detecting any relative change in the alcohol content in the mixture. Our technique, therefore, emerges as a sensitive tool for quality testing of alcohol-based hand sanitizers.

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Comparison of Vinyldimethylaniline and Indolizine Donor Groups on Si‐Substituted Xanthene Core Shortwave Infrared Fluorophores

Kaur,

Kruse,

Smith

et al. 2024

ChemPhotoChem

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Small organic molecules absorbing and emitting in the shortwave infrared (SWIR, 1000‐2000 nm) region are desirable for biological imaging applications due to low auto‐fluorescence, reduce photon scattering, and good tissue penetration depth which allows for in vivo imaging with high resolution and sensitivity. Si‐substituted xanthene‐based fluorophores with indolizine donors have demonstrated some of the longest wavelength absorption and emission from organic dyes. This work seeks to compare an indolizine heterocyclic nitrogen with dimethyl aniline nitrogen donors on otherwise identical Si‐substituted xanthene fluorophores via optical spectroscopy, computational chemistry and electrochemistry. Three donors are compared including an indolizine donor, a ubiquitous dimethyl aniline donor, and a vinyl dimethyl aniline group that keeps the number of π‐bonds consistent with indolizine. Significantly higher quantum yields and molar absorptivity are observed in these studies for a dimethylamine‐based donor relative to a simple indolizine donor absorbing and emitting at similar wavelengths (~1312 nm emission). Substantially longer wavelengths are obtainable by appending aniline‐based groups to the indolizine donor (~1700 nm) indicating longer wavelengths can be accessed with indolizine donors while stronger emitters can be accessed with anilines in place of indolizine.

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Identification of overtone and combination bands of organic solvents by thermal lens spectroscopy with tunable Ti:sapphire laser excitation

Cited by 7 publications

References 43 publications

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Quality assessment of the commercially available alcohol-based hand sanitizers with femtosecond thermal lens spectroscopy

Comparison of Vinyldimethylaniline and Indolizine Donor Groups on Si‐Substituted Xanthene Core Shortwave Infrared Fluorophores

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