Standard enthalpies of formation of the phenylalanine isomers and the products of their dissociation in aqueous solutions

2008 ◽  
Vol 91 (3) ◽  
pp. 775-778 ◽  
Author(s):  
L. A. Kochergina ◽  
E. Lc. Ratkova ◽  
A. V. Emeljanov
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

Standard Enthalpies of Formation of L-Glutathion and Products of Its Dissociation in Aqueous Solutions

2021 ◽  
Vol 95 (9) ◽  
pp. 1831-1834
Author(s):  
A. I. Lytkin ◽  
V. V. Chernikov ◽  
O. N. Krutova ◽  
A. A. Golubev ◽  
R. A. Romanov
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

Standard enthalpies of formation for crystalline serine and isoserine and products of their dissociation in aqueous solutions

2016 ◽  
Vol 90 (2) ◽  
pp. 325-328 ◽  
Author(s):  
A. I. Lytkin ◽  
V. V. Chernikov ◽  
O. N. Krutova ◽  
K. V. Damrina ◽  
I. A. Skvortsov
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

Standard enthalpies of formation of crystalline L-threonine and the products of its dissociation in aqueous solutions

2015 ◽  
Vol 90 (1) ◽  
pp. 105-108
Author(s):  
A. I. Lytkin ◽  
V. V. Chernikov ◽  
O. N. Krutova ◽  
K. V. Damrina ◽  
I. A. Skvortsov
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

Standard enthalpies of formation for glycyl-tyrosine and products of its dissociation in aqueous solutions

2015 ◽  
Vol 89 (7) ◽  
pp. 1223-1226
Author(s):  
L. A. Kochergina ◽  
V. G. Badelin ◽  
O. N. Krutova ◽  
A. V. Volkov ◽  
K. V. Damrina
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

Standard enthalpies of formation of l-lysine and the products of its dissociation in aqueous solutions

2017 ◽  
Vol 130 (1) ◽  
pp. 457-460 ◽  
Author(s):  
A. I. Lutkin ◽  
V. V. Chernikov ◽  
O. N. Krutova ◽  
I. A. Skvortsov
Keyword(s):  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Standard Enthalpies Of Formation

scholarly journals Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association

Colorants ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 5-19
Author(s):  
Serghey A. Shapovalov
Keyword(s):  
Aqueous Solutions ◽  
Systematic Error ◽  
Enthalpies Of Formation ◽  
Bromocresol Purple ◽  
Spectroscopy Data ◽  
Thermodynamic Constants ◽  
Vis Spectroscopy ◽  
Standard Enthalpies Of Formation ◽  
Semi Empirical ◽  
Quinaldine Red

The interaction between single- or double-charged anions of bromocresol purple (BP) and cyanine cations (quinaldine blue, QB, or quinaldine red, QR) at concentrations of dyes 5.0·10−7–4.0·10−5 mol/L has been investigated by vis-spectroscopy. The thermodynamic constants of dissimilar associations (Kas) have been studied. Comparison of the values of lg Kas shows that QB− associates of BP− are more stable (6.61 ± 0.07) than QR associates (4.84 ± 0.06); a similar phenomenon is observed for associates of the BP2− anion. Semi-empirical calculations (PM3 method) are in agreement with the vis-spectroscopy data and indicate that the association of dye into an associate is possible. The standard enthalpies of formation of associates (ΔfHo) and energy diagrams have been determined. The ΔfHo data indicate that the formation of an associate between dye ions is an energetically favourable process. The gain in energy significantly exceeds the systematic error of semi-empirical calculations and increases from 157 kJ/mol (associate ”BP− + QB+”) to 729 kJ/mol (associate “BP2− + QR+”). The most probable structures of dissimilar associates are presented. The study of the dissimilar association develops the concept of intermolecular interactions in solutions.

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