Results 21 to 30 of about 2,560 (205)

Solvatochromic and Single Crystal Studies of Two Neutral Triarylmethane Dyes with a Quinone Methide Structure

Molecules, 2015
The crystal structure of two neutral triarylmethane dyes with a p-quinone methide core was determined by X-ray diffraction analysis. The spectroscopic characteristics of both compounds in 23 solvents with different polarities or hydrogen-bonding donor ...
Katherine Chulvi, Ana M. Costero, Luis E. Ochando, Salvador Gil, José-Luis Vivancos, Pablo Gaviña   +5 more
doaj   +2 more sources

Solvatoalignment index and solvent-dependent behavior of asymmetric discotic liquid crystals: effect of polarity and alkyl chain length [PDF]

Scientific Reports
Discotic liquid crystals (DLCs) are emerging as versatile functional materials with significant potential for optical and sensing applications. Their photophysical behavior is highly sensitive not only to solvent polarity but also to molecular asymmetry ...
Roshanak Kian, Amid Ranjkesh, Bita Taheri, Sanjay Kumar Varshney, Neda Ebrahimpour, Mohammad Sadegh Zakerhamidi   +5 more
doaj   +2 more sources

Solvatochromic and Computational Study of Three Benzo-[f]-Quinolinium Methylids with Photoinduced Charge Transfer [PDF]

Molecules
The solvatochromic properties of 48 solvents of three benzo-[f]-quinolinium methylids (BfQs) were analyzed within the theories of the variational model and Abe’s model of the liquid.
Mihaela Iuliana Avadanei, Ovidiu Gabriel Avadanei, Dana Ortansa Dorohoi   +2 more
doaj   +2 more sources

SOLVATOCROMISMO E AS ESCALAS EMPÍRICAS DE POLARIDADE DO SOLVENTE: UMA REVISÃO [PDF]

Química Nova, 2023
The term solvatochromism is used to describe the changes in the optical properties of a dye molecule by influence of the solvent characteristics. Solvatochromic shifts are governed by intermolecular interactions between solute-solvent that can be either ...
Ingrid Maliszewski Paczkowski, Leandra Franciscato Campo   +1 more
doaj   +1 more source

Effects of solvent and structure on the reactivity of 6-substituted nicotinic acids with diazodiphenylmethane in aprotic solvents [PDF]

Journal of the Serbian Chemical Society, 2009
The rate constants for the reactions of diazodiphenylmethane (DDM) with 6-substituted nicotinic acids in aprotic solvents at 30°C were determined. The obtained second order rate constants in aprotic solvents, together with literature data for benzoic and
Drmanić Saša Ž., Marinković Aleksandar D., Jovanović Bratislav Ž.   +2 more
doaj   +3 more sources

Solvatochromic parameters of deep eutectic solvents formed by ammonium-based salts and carboxylic acids. [PDF]

Fluid Phase Equilib, 2017
Deep eutectic solvents (DES) have been studied in a wide range of applications, and despite their potential as sustainable solvents, detailed knowledge on their solvatochromic parameters is still lacking. To overcome this problem, in this work, the Kamlet Taft (KT) solvatochromic parameters, namely the hydrogen-bond acidity, hydrogen-bond basicity and ...
Teles ARR, Capela EV, Carmo RS, Coutinho JAP, Silvestre AJD, Freire MG.   +5 more
europepmc   +4 more sources

Effects of solvent and structure on the reactivity of 2-substituted nicotinic acids with diazodiphenylmethane in aprotic solvents [PDF]

Journal of the Serbian Chemical Society, 2012
The rate constants for the reactions of diazodiphenylmethane (DDM) with 2-substituted nicotinic acids in nine aprotic solvents at 30°C were determined. The obtained second order rate constants in aprotic solvents, were correlated using the Kamlet-Taft
Drmanić Saša Ž., Nikolić Jasmina B., Jovanović Bratislav Ž.   +2 more
doaj   +1 more source

Solvent effect on the absorption and emission spectra of carbon dots: evaluation of ground and excited state dipole moment

BMC Chemistry, 2021
Background Carbon dots (C-dots) are photoluminescent nanoparticles with less than 10 nm in size. Today, many studies are performed to exploit the photoluminescence (PL) property of carbon dots, and our focus in this study is to estimate the dipole moment
Parisa Mohammad-Jafarieh, Abolfazl Akbarzadeh, Rahman Salamat-Ahangari, Mohammad Pourhassan-Moghaddam, Kazem Jamshidi-Ghaleh   +4 more
doaj   +1 more source

Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents, Part I: Pyridine mono-carboxylic acids [PDF]

Journal of the Serbian Chemical Society, 2005
Rate constants for the reaction of diazodiphenylmethane with isomeric pyridine carboxylic acids were determined in chosen protic and aprotic solvents at 30 °C, using the well known UV spectrophotometric method.
Marinković Aleksandar D., Drmanić Saša Ž., Jovanović Bratislav Ž., Mišić-Vuković Milica M.   +3 more
doaj   +1 more source

New QSAR and Solvatochromic Estimation of Molecular Parameters of Chlortetracycline

Revista de Chimie, 2020
The present paper is focused on determination of the main parameters of Chlortetracycline. Chlortetracycline belongs to one of the most used family of antibiotics worldwide, Tetracyclines. Because of the large spectrum of infections which can be treated with this category of antibiotics there are attempts to find new derivatives from this class.
Antonina Gritco-Todirascu, Dorina Emilia Creanga, Liliana Mihaela Ivan, Dana Ortansa Dorohoi, Anamaria Ciubara   +4 more
openaire   +1 more source