Molar volume and ultrasonic studies of europium soaps in mixed organic solvents

1996 ◽  
Vol 73 (7) ◽  
pp. 897-902 ◽  
Author(s):  
K. N. Mehrotra ◽  
M. Chauhan ◽  
R. K. Shukla
Keyword(s):  
Molar Volume ◽  
Organic Solvents

Partial molar volume of some monovalent salts and polar molecules in organic solvents

1982 ◽  
Vol 27 (4) ◽  
pp. 393-398 ◽  
Author(s):  
Paul G. Glugla ◽  
Jae H. Byon ◽  
Charles A. Eckert
Keyword(s):  
Molar Volume ◽  
Organic Solvents ◽  
Partial Molar Volume ◽  
Polar Molecules

scholarly journals Regularities of organic solvents diffusion into fluoropolymer structure

2008 ◽  
Vol 2 (1) ◽  
pp. 7-10
Author(s):  
Iryna Yevchuk ◽  
◽  
Roman Makitra ◽  
Olena Pal’chykova ◽  
Galyna Khovanets’ ◽  
...  
Keyword(s):  
Molar Volume ◽  
Organic Solvents ◽  
Diffusion Coefficients ◽  
Cohesion Energy ◽  
Multiparameter Equations ◽  
Copolymer Structure

Diffusion coefficients of organic solvents into tetrafluoroethylene-propylene copolymer structure may be generalized by multiparameter equations. Molar volume and cohesion energy of penetrating liquids are suggested to be determining their values and retarding the process.

scholarly journals OXIDATION OF THE ACRYDINE BY PEROXYDECANIC ACID IN VARIOUS ORGANIC SOLVENTS

2020 ◽  
Vol 2020 (60) ◽  
pp. 22-30
Author(s):  
Volodymyr DUTKA ◽  
◽  
Galyna MIDYANA ◽  
Yuriy DUTKA ◽  
Olena PAL’CHIKOVA ◽  
...  
Keyword(s):  
Activation Energy ◽  
Transition State ◽  
Molar Volume ◽  
Organic Solvents ◽  
Rate Constants ◽  
Physicochemical Parameters ◽  
Oxidation Process ◽  
Correlation Equation ◽  
Effective Rate ◽  
Correlation Equations

The rate of oxidation reaction of the acrydine with peroxydecanoic acid in various organic solvents was studied. It has been found the effective rate constants (k) and the activation energy (Ea) of studied process. Between the parameters of the transition state ΔН≠ and ΔЅ≠ is some linear relationship, indicating on the presence of the counteraction effect in our series of experiments. The rate of oxidation and activation energy inflation of solvation peroxyacid and acrydine was calculated. The reaction medium affects the rate of oxidation. Correlation equations between the rate constants of the reactions in study and the physicochemical parameters of the solvents were proposed. The correlation equation for effective rate constants and the basic physicochemical parameters of solvents at 318 K has the form: k = –388.8034 + (1662.9800 ± 313.4735)f(n) – (221.2833 ± 70.3626)f(ε) + (0.8092 ± 0.1145)B N = 8; R = 0.9982; S = 3.0727; F = 5.2713. The polarizability, polarization and basicity, of solvent have effect on the oxidation process. The influence of electrophilicity polarization and molar volume on the rate of oxidation of acrydine decay process is negligible. Correlation equations for effective rate constants for other temperatures are similar. The correlation equation for effective energies (Ea) of activation and the basic physicochemical parameters of solvents has the form: Eа = 104.6924 + (50.3320 ± 12.6429)f(ε) + (0.0557 ± 0.0137)B – (0.1201 ± 0.0188)δ2 – (0.5573 ± 0.0782)Vм N = 9; R = 0.9663; S = 2.8058; F = 1.3842. The polarizability, basicity, molar volume and Hildebrand's function of solvent have effect on the energy of activation process. The proposed correlation equations relate the parameters of the transition state of the oxidation process and the physic-chemical parameters of solvents.

UNTERSUCHUNGEN ÜBER DIE EXTRAKTION DES ROTEN KOBER-FARBSTOFFS DURCH ORGANISCHE LÖSUNGSMITTEL ZUR ÖSTROGENBESTIMMUNG IM HARN

1960 ◽  
Vol XXXV (I) ◽  
pp. 34-48 ◽  
Author(s):  
Gerd Ittrich
Keyword(s):  
Menstrual Cycle ◽  
Organic Solvents ◽  
Urine Sample ◽  
Phenol Derivatives ◽  
Organische Lösungsmittel ◽  
Colour Complex

ABSTRACT A series of organic solvents and phenol derivatives have been examined for the extraction of the pink Kober-colour complex. Optimal results could be achieved for fluorimetry by a solution of 2 % (w/v) p-nitrophenol and 1 % (v/v) ethanol in acetylenetetrabromide, when the green mercury line (546 mμ was used as primary light. The sensitivity, stability and specificity have been improved, compared with the previously described reaction. By changing the sequence of purification steps and by reducing the volume of the urine sample (5 ml) the method for the determination of total oestrogens has been simplified. Approximately 10 determinations can be done within 3–4 hours by one person. Recovery experiments and comparative determinations with a previously described method have been carried out. The excretion of total oestrogens in a complete menstrual cycle is determined with the described method.

Imidazole Promoted Efficient Anomerization of β-D-Glucose Pentaacetate in Organic Solutions and Solid State

2019 ◽  
Author(s):  
Meifeng Wang ◽  
Liyin Zhang ◽  
Yiqun Li ◽  
Liuqun Gu
Keyword(s):  
Solid State ◽  
Organic Solvents ◽  
Room Temperature ◽  
Materials Design ◽  
The Future ◽  
Organic Solutions ◽  
Glucose Pentaacetate

<p></p>Anomerization of glycosides were rarely performed under basic condition due to lack of efficiency. Here an imidazole promoted anomerization of β-D-glucose pentaacetate was developed; and reaction could proceed in both organic solvents and solid state at room temperature. Although mechanism is not yet clear, this unprecedent mild anomerization in solid state may open a new promising way for stereoseletive anomerization of broad glucosides and materials design in the future..

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