Characterization of Solvent Effects on C=O Stretching Vibrations of Ketoprofen by Empirical Solvent Parameters

2021 ◽  
Author(s):  
S. Sagdinc ◽  
N. Tekin
Keyword(s):  
Solvent Effects ◽  
Solvent Parameters ◽  
Stretching Vibrations

A contribution to evaluation of influence of medium in electronic and infrared spectroscopy

1982 ◽  
Vol 47 (4) ◽  
pp. 1060-1068 ◽  
Author(s):  
Vojtěch Bekárek ◽  
Jan Juřina
Keyword(s):  
Refractive Index ◽  
Infrared Spectroscopy ◽  
Correlation Coefficient ◽  
Solvent Effects ◽  
Electronic Spectra ◽  
Relative Permittivity ◽  
Solvent Parameters

Dependence of ET(30) of solvent parameters on relative permittivity (ε) and refractive index (n) of solvent has been found for forty solvents in the form ET(30)=29.87 + 72.03 (ε - 1/(2ε + 1)-29.16(ε - 1) (n 2 - 1)/(2ε + 1) (2n2 + 1), the correlation coefficient being 0.958. Relation has been discussed between ET(30) and π solvent parameters and significance of the term (ε - 1). (n2 - 1)/(2ε + 1) (2n2 + 1) has been tested for evaluation of solvent effects in electronic spectra.>

scholarly journals Synthesis and Characterization of Magnetic Nanoparticles (MNP) and MNP-Chitosan Composites

2019 ◽  
Author(s):  
Monica Namizie Asey ◽  
Norhaizan Mohd Esa ◽  
Che Azurahanim Che Abdullah
Keyword(s):  
Chemical Bonding ◽  
Magnetic Nanoparticle ◽  
Ftir Analysis ◽  
Optimum Size ◽  
Optimum Ratio ◽  
Anticancer Drug Delivery ◽  
The Common ◽  
Stretching Vibrations ◽  
Direct Toxicity

Coating of iron oxide nanoparticles (MNP) is the common approach to reduce the effects of direct toxicity due to the ion oxidation that lead to the damage of DNA. This study investigates the effect of different concentration of Chitosan (Cs) used to coat the magnetic nanoparticle with variation in the crystallite size, chemical bonding, changes in weight and surface morphology. From the XRD results, it shows that the sample 1MNP-1Cs has optimum size of 13.42 ± 0.01 nm. From the FTIR analysis, it is revealed that there are three types of chemical bonding that occur in the MNP-Cs composites which are stretching vibrations of C-H, N–H vibration belonging to Cs and the Fe-O bonds from the MNP. From the FESEM analysis, it is found that the MNP-Cs composites have a wellshaped with spherical in form, as well as, smooth surfaces. As for TGA, the thermal decomposition of MNP nanocomposites was based on the amount of Cs and MNP used to produce the nanocomposites. Further studies will be conducted to find the optimum ratio of MNP-Cs for anticancer drug delivery application.

Characterization of Alcohol Solvents by the Empirical Polarity Parameters AN, Z, and ET(30)

1982 ◽  
Vol 37 (6) ◽  
pp. 684-687 ◽  
Author(s):  
Horst Elias ◽  
Michael Dreher ◽  
Sabine Neitzel ◽  
Harald Volz
Keyword(s):  
Benzyl Alcohol ◽  
Solvent Effects ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Acceptor Number ◽  
Binary Solvent Mixtures ◽  
Alcohol Solvents ◽  
Polarity Parameters

AbstractThe acceptor number AN and the polarity parameters Z and ET(30) were determined for a series of alcohols applied as media in the study of kinetic solvent effects. The alcohols thus characterized are methanol, ethanol, 1-propanol, 1-butanol, 2-butanol, 2-methyl-2-butanol, 3-pentanol, 2-chloroethanol, 2-methoxyethanol, 2-phenylethanol, 2-cyanoethanol, benzyl alcohol, 3-ethyl-3-pentanol, 2,4-dimethyl-3-pentanol, and 3-ethyl-2,4-dimetliyl-3-pentanol. In addition, AN was determined for 1,2-dichloroethane and Z for the binary solvent mixtures methanol/2-methyl-2-butanol, ethanol/2,2,2-trifluoroethanol. and methanol/pyridine. The data obtained are correlated and the parameters AN, Z, and ET(30) are critically compared.

Interpretation of Hydroxylic Solvent Effects Based on Correlations with Solvent Parameters. Reaction of Et3N with EtI

1994 ◽  
Vol 59 (4) ◽  
pp. 898-904 ◽  
Author(s):  
António R. T. Calado ◽  
Lídia M. V. Pinheiro ◽  
Lídia M. P. C. Albuquerque ◽  
Raquel M. C. Goncalves ◽  
Martí Rosés ◽  
...  
Keyword(s):  
Energy Density ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Solvent Effects ◽  
Rate Constants ◽  
Cohesive Energy ◽  
Regression Equations ◽  
Solvatochromic Parameters ◽  
Cohesive Energy Density ◽  
Solvent Parameters

Hydroxylic solvent effects on 20 rate constants, k, of the Menschutkin reaction of Et3N with EtI are unravelled and rationalized by means of multiple linear regression equations. To perform this analysis new k values in 2 mono- and 9 dialcohols are obtained. New values are also presented for the Kamlet and Taft solvatochromic parameters π*, α and β of 1-hexanol. The results show that the solvent dipolarity, polarizability and cohesive energy density are the main properties influencing the reactivity, for the set of studied solvents.

Determination of solvatochromic solvent parameters for the characterization of gas-expanded liquids

2005 ◽  
Vol 36 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Victor T. Wyatt ◽  
David Bush ◽  
Jie Lu ◽  
Jason P. Hallett ◽  
Charles L. Liotta ◽  
...  
Keyword(s):  
Solvent Parameters ◽  
Gas Expanded Liquids
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