Thermodynamics of the weak interaction between samarium cation and xylitol in water : a chemical model

The thermodynamic characterization of the weakly complexed model system Sm[sup 3+]-xylitol has been carried out. The standard Gibbs energy, enthalpy, entropy, volume and heat capacity of complexation of Sm[sup 3+] by xylitol have been determined in water at 25[degrees]. The stability constant and th...

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Bibliographic Details
Published in:Journal of solution chemistry 1994-03, Vol.23 (3), p.351-362
Main Authors: RONGERE, P, MOREL-DESROSIERS, N, MOREL, J.-P
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
ALCOHOLS
CALORIMETRY
CATIONS
CHARGED PARTICLES
Chemical thermodynamics
Chemistry
COMPLEXES
Elements, mineral and organic compounds
ENERGY
ENTHALPY
ENTROPY
Exact sciences and technology
FREE ENTHALPY
General and physical chemistry
HYDROXY COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPLEXES
SAMARIUM COMPLEXES
SPECIFIC HEAT
STABILITY
THERMODYNAMIC PROPERTIES
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Summary:The thermodynamic characterization of the weakly complexed model system Sm[sup 3+]-xylitol has been carried out. The standard Gibbs energy, enthalpy, entropy, volume and heat capacity of complexation of Sm[sup 3+] by xylitol have been determined in water at 25[degrees]. The stability constant and the enthalpy change have been simultaneously determined by using a calorimetric method. The thermodynamic properties characterizing solely the specific interaction between the cation and the complexing sequence of hydroxyl groups of the ligand have been isolated. The stability constant and the volume of complexation have also been estimated from a similar treatment of the apparent molar volumes. It was found that the reaction by: K = 8.1, [Delta][sub r]G[sup o] = -5.2 kJ-mol[sup [minus]1], [Delta][sub r]H[sup o] = -13.7 kJ-mol[sup [minus]1], T[Delta][sub r]S[sup o] = -8.5 kJ-mol[sup [minus]1], [Delta][sub r]V[sup o] = 8.8 cm[sup 3]-mol[sup [minus]1] and [Delta][sub r]C[sup o[sub p]] = 51 J-K[sup [minus]1]-mol[sup [minus]1].
ISSN:0095-9782
1572-8927
DOI:10.1007/BF00973108