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Thermodynamics of molecular complexation of glycyl–glycyl–glycine with cryptand [2.2.2] in water–dimethylsulfoxide solvent at 298.15 K
The influence of water–dimethylsulfoxide (H 2 O–DMSO) solvent on the reaction of the molecular complex formation between cryptand [2.2.2] (L) and glycyl–glycyl–glycine (3Gly) was studied at T = 298.15 K. The thermodynamic parameters for the reaction (lg K 0 , Δ r G 0 , Δ r H 0 , T Δ r S 0 ) were ob...
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Published in: | Journal of thermal analysis and calorimetry 2016-10, Vol.126 (1), p.307-314 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The influence of water–dimethylsulfoxide (H
2
O–DMSO) solvent on the reaction of the molecular complex formation between cryptand [2.2.2] (L) and glycyl–glycyl–glycine (3Gly) was studied at
T
= 298.15 K. The thermodynamic parameters for the reaction (lg
K
0
, Δ
r
G
0
, Δ
r
H
0
,
T
Δ
r
S
0
) were obtained from calorimetric titration experiments carried out by means of the calorimetric system TAM III (TA Instruments, USA). The binding mode of 3Gly–L complexation in H
2
O–DMSO solvent was determined by NMR spectroscopy, and the spectroscopic data were also used to calculate the [3GlyL] stability constants. A slight increase in complex stability and reaction exothermicity was observed at increasing DMSO content. The thermodynamic parameters for [3GlyL] are compared with thermodynamic parameters of complex formation of 18-crown-6 with amino acids and 3Gly in mixed solvents using the solvation-thermodynamic approach. |
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ISSN: | 1388-6150 1588-2926 |
DOI: | 10.1007/s10973-016-5383-0 |