Results 181 to 190 of about 4,021 (220)
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Electrochromism and Solvatochromism
Angewandte Chemie International Edition in English, 1969AbstractThe position and the intensity of electronic bands are influenced by an electric field. Pronounced changes in the position of absorption bands are mainly due to the dipole moment of the molecule in the ground state and the change in the dipole moment during the excitation process, and pronounced changes in intensity are due to the field ...
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Solvatochromic Probes in Supercritical Fluids
ChemInform, 2005AbstractFor Abstract see ChemInform Abstract in Full Text.
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Solvatochromic parameters of ethanolamines
Journal of the Chemical Society, Faraday Transactions, 1997The solvatochromic parameters measuring the polarity, hydrogen bond donation (Lewis acidity) and electron pair acceptance (Lewis basicity) abilities of ethanolamine, diethanolamine and triethanolamine have been determined spectroscopically by means of suitable indicators. The degree of structure of these liquids was calculated.
Abdulkarim S. Labban, Yizhak Marcus
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Fluorescence solvatochromism of nitrodiphenylhexatrienes
Journal of the Chemical Society, Faraday Transactions 2, 1985Examination of the absorption and fluorescence spectra of symmetrically and asymmetrically substituted 4′-nitro derivatives of 1,6-diphenyl-1,3,5,-hexatriene reveals fundamental transformations of photophysical behaviour relative to the parent molecule. The manifestations of this divergence are solvent dependent.
Iain D. Johnson +2 more
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A microstructural model of solvatochromism
Advances in Molecular Relaxation and Interaction Processes, 1977Abstract A new microstructural model of solvatochromism is suggested and used to describe the solvent induced changes of both the electronic spectrum and structure of a simple pentamethinemerocyanine dye molecule. The electrostatic potential on the surface of a molecule is calculated from the net charges at the atomic centres, which are accessible ...
K.D. Nolte, S. Dähne
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Kinetics of fluorescence solvatochromism
Chemical Physics Letters, 1977Abstract While the static aspect of fluorescence solvatochromism is well understood, the kinetics has been the subject of few experimental investigations and theoretical considerations. A recently published microscopic model without cooperative effects is extended to include light polarization and rotational diffusion. Rotation-free pulse fluorimetry
H.E. Lessing, M. Reichert
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Substituted benzylideneanilines: A family of solvatochromic probes
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019The solvatochromic behaviour of ten tailor-made structurally-related substituted N-benzylidineanilines was investigated in presence of solvents of varying polarities through inspection of UV-visible absorption spectra in the range 200 to 600 nm. The spectral bands were found to be significantly influenced by altering the polarity of the solvents. The o-
Padmini, Suna +2 more
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Solvatochromism and mechanochromism observed in a triphenylamine derivative
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, 2019A donor–π–acceptor fluorescent dye, 4-[N,N-di(4-phenyl)amino]benzaldehyde 4-chlorobenzoyl hydrazone (TPA-CBH), based on a triphenylamine derivative (TPA) and 4-chlorobenzoyl hydrazine (CBH) was designed and synthesized. The optical properties of this luminogen were investigated in solutions as well as in the solid states.
Chunyang, Guo +6 more
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Vibrational Solvatochromism in Vaska’s Complex Adducts
The Journal of Physical Chemistry A, 2012The vibrational solvatochromism of bis(triphenylphosphine) iridium(I) carbonyl chloride (Vaska's complex, VC) was investigated by FTIR spectroscopy. The carbonyl stretching frequency (ν(CO)) was measured in 16 different organic solvents with a wide range of Lewis acidities for VC and its dioxygen (VC-O(2)), hydride (VC-H(2)), iodide (VC-I(2)), bromide (
Christopher J, Huber +5 more
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Solvatochromic Shifts: A Reconsideration
The Journal of Physical Chemistry A, 1998Solvatochromic shifts in molecular spectra are often used to determine excited-state dipole moments. In comparing results with the more accurate gas-phase Stark effects studies, large discrepancies are obtained in the few cases in which both types of studies have been carried out. We attempt to reconcile the two techniques by reanalyzing solvatochromic
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