Substituent Effects on the Solvatochromism of 2-Phenylimidazopyrazinones: Effective Control of the Color Variation Range and Sensitivity toward an Indication of the Proton-donor Ability of Solvents by an Electron-withdrawing Group Substitution

2004 ◽  
Vol 33 (11) ◽  
pp. 1484-1485 ◽  
Author(s):  
Yoshiharu Takamuki ◽  
Shojiro Maki ◽  
Haruki Niwa ◽  
Hiroshi Ikeda ◽  
Takashi Hirano
Keyword(s):  
Substituent Effects ◽  
Proton Donor ◽  
Color Variation ◽  
Effective Control ◽  
Variation Range ◽  
Donor Ability ◽  
Electron Withdrawing Group

scholarly journals The impact of orally administered gadolinium orthovanadate GdVO4:Eu3+ nanoparticles on the state of phospholipid bilayer of erythrocytes

2020 ◽  
Vol 45 (4) ◽  
pp. 389-395
Author(s):  
Anton Tkachenko ◽  
Anatolii Onishchenko ◽  
Vladimir Klochkov ◽  
Nataliya Kavok ◽  
Oksana Nakonechna ◽  
...  
Keyword(s):  
Fluorescent Probes ◽  
Lipid Membranes ◽  
Chemical Properties ◽  
Proton Donor ◽  
The State ◽  
Phospholipid Bilayer ◽  
Erythrocyte Membranes ◽  
Control Group ◽  
Donor Ability ◽  
The Impact

AbstractObjectivesTo assess the state of phospholipid bilayer of red blood cells (RBCs) in rats orally exposed to gadolinium orthovanadate GdVO4:Eu3+ nanoparticles (VNPs) during two weeks using fluorescent probes − ortho-hydroxy derivatives of 2,5-diaryl-1,3-oxazole.MethodsSteady-state fluorescence spectroscopy: a study by the environment-sensitive fluorescent probes − 2-(2′-OH-phenyl)-5-phenyl-1,3-oxazole (probe O1O) and 2-(2′-OH-phenyl)-phenanthro[9,10]-1,3-oxazole (probe PH7).ResultsNo significant changes are detected in the spectra of the fluorescent probes bound to the RBCs from the rats orally exposed to nanoparticles in comparison with the corresponding spectra of the probes bound to the cells from the control group of animals. This indicates that, in case of the rats orally exposed to nanoparticles, no noticeable changes in physico-chemical properties (i.e., in the polarity and the proton-donor ability) are observed in the lipid membranes of RBCs in the region, where the probes locate.ConclusionsNo changes in the physical and chemical properties of the erythrocyte membranes are detected in the region from glycerol backbones of phospholipids to the center of the phospholipid bilayer in the rats orally exposed to VNPs during 2 weeks.

Influence of chlorine-substitution in pyrimidine ring on proton donor ability in H-bond and parameters of amino group of 2-amino pyrimidine

2005 ◽  
Vol 37 (1) ◽  
pp. 97-109 ◽  
Author(s):  
V.E. Borisenko ◽  
S.A. Krekov ◽  
M.A. Niyazova ◽  
A. Koll ◽  
P. Lipkowski
Keyword(s):  
Pyrimidine Ring ◽  
Proton Donor ◽  
Amino Group ◽  
Chlorine Substitution ◽  
Donor Ability ◽  
Amino Pyrimidine

scholarly journals Dual-color blending based visual LAMP for food allergen detection: a strategy with enlarged color variation range and contrast

2021 ◽  
pp. 100201
Author(s):  
Fang Zhang ◽  
Chenshan Gao ◽  
Linlin Bai ◽  
Yiquan Chen ◽  
Shuying Liang ◽  
...  
Keyword(s):  
Food Allergen ◽  
Color Variation ◽  
Dual Color ◽  
Allergen Detection ◽  
Variation Range ◽  
Color Blending

scholarly journals Rotational Spectroscopy Meets Quantum Chemistry for Analyzing Substituent Effects on Non-Covalent Interactions: The Case of the Trifluoroacetophenone-Water Complex

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4899
Author(s):  
Juncheng Lei ◽  
Silvia Alessandrini ◽  
Junhua Chen ◽  
Yang Zheng ◽  
Lorenzo Spada ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Substituent Effects ◽  
Equilibrium Structure ◽  
Proton Donor ◽  
Rotational Spectroscopy ◽  
Donor And Acceptor ◽  
Analogous Complex ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The most stable isomer of the 1:1 complex formed by 2,2,2-trifluoroacetophenone and water has been characterized by combining rotational spectroscopy in supersonic expansion and state-of-the-art quantum-chemical computations. In the observed isomer, water plays the double role of proton donor and acceptor, thus forming a seven-membered ring with 2,2,2-trifluoroacetophenone. Accurate intermolecular parameters featuring one classical O-H···O hydrogen bond and one weak C-H···O hydrogen bond have been determined by means of a semi-experimental approach for equilibrium structure. Furthermore, insights on the nature of the established non-covalent interactions have been unveiled by means of different bond analyses. The comparison with the analogous complex formed by acetophenone with water points out the remarkable role played by fluorine atoms in tuning non-covalent interactions.

Proton donor ability of surface hydroxy groups from the IR spectra of hydrogen-bonded complexes

1978 ◽  
Vol 9 (3) ◽  
pp. 265-268 ◽  
Author(s):  
E. A. Paukshtis ◽  
L. G. Karakchiev ◽  
N. S. Kotsarenko
Keyword(s):  
Ir Spectra ◽  
Proton Donor ◽  
Donor Ability ◽  
Hydroxy Groups ◽  
Bonded Complexes ◽  
Hydrogen Bonded

IR-spectroscopic evaluation of proton-donor ability of HCl, HBr, HI acids and HSO3CF3, HClO4, HGeCl3, HAlCl4 superacids

1983 ◽  
Vol 32 (3) ◽  
pp. 636-637
Author(s):  
V. B. Kazanskii ◽  
O. M. Nefedov ◽  
A. A. Pankov ◽  
V. Yu. Borovkov ◽  
S. P. Kolesnikov ◽  
...  
Keyword(s):  
Proton Donor ◽  
Donor Ability ◽  
Ir Spectroscopic

scholarly journals The inhibition of the proton donor ability of bicarbonate promotes the electrochemical conversion of CO2 in bicarbonate solutions

2021 ◽  
Vol 48 ◽  
pp. 101521
Author(s):  
Oriol Gutiérrez-Sánchez ◽  
Nick Daems ◽  
Willem Offermans ◽  
Yuvraj Y. Birdja ◽  
Metin Bulut ◽  
...  
Keyword(s):  
Proton Donor ◽  
Electrochemical Conversion ◽  
Donor Ability ◽  
Bicarbonate Solutions

Chemometrical Analysis of Substituent Effects. III. Additivity of Substituent Effects in Dissociation of 3,4-Disubstituted Benzoic Acids in Organic Solvents

1994 ◽  
Vol 59 (3) ◽  
pp. 627-638 ◽  
Author(s):  
Oldřich Pytela ◽  
Jiří Kulhánek ◽  
Miroslav Ludwig ◽  
Václav Říha
Keyword(s):  
Dimethyl Sulfoxide ◽  
Organic Solvents ◽  
Dissociation Constants ◽  
Substituent Effects ◽  
Proton Donor ◽  
Benzoic Acids ◽  
Correlation Equations ◽  
Hammett Equation ◽  
Validity Range ◽  
Reaction Constants

Sixteen 3,4-disubstituted benzoic acids (with all combinations of CH3O, CH3, Cl/Br, and NO2 substituents) have been synthesized and their dissociation constants measured in seven organic solvents (methanol, acetone, dimethyl sulfoxide, dimethylformamide, acetonitrile, pyridine, 1,2-dichloroethane). The effect of disubstitution and the validity of additive correlation relationships based on the Hammett equation have been analyzed by means of the analysis of variance, comparison of overall residual standard deviations of correlation equations of additive and additive multiplicative type, and application of the Hammett equation with internal (latent, defined in various ways) parameters and external (taken from literature) parameters describing the substituent effects. The effect of disubstitution has been found to be additive and describable within the validity range of the substituent constants adopted - by applying the additivity principle without any additional correction for interactions between the two substituents. The same conclusion has been drawn from the comparison of overall residual deviations in correlation equations for mono- and disubstituted derivatives. The analysis of differences between the reaction constants of the Hammett equation applied to mono- and disubstituted benzoic acids has shown that in organic solvents the solvation of substituents makes various contributions. The substituent influence is stronger in polar aprotic solvents (acetone, dimethyl sulfoxide, dimethylformamide, acetonitrile) than that in the protic, basic, and less polar ones in which the stabilization by hydrogen bond becomes important, the role of proton donor being played either by the solvent itself (methanol) or by its conjugated acid (pyridine) or by a molecule of the dissociating acid as a consequence of homoconjugation (1,2-dichloroethane).

Structure and proton-donor ability of N-(1-trifluoromethylsulfonylamino-2,2,2-trichloroethyl)-acrylamide

2009 ◽  
Vol 79 (6) ◽  
pp. 1146-1151 ◽  
Author(s):  
L. P. Oznobikhina ◽  
N. N. Chipanina ◽  
B. A. Shainyan ◽  
T. N. Aksamentova ◽  
E. V. Kondrashov ◽  
...  
Keyword(s):  
Proton Donor ◽  
Donor Ability
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