Volume and Enthalpy Changes of Peroxodiphosphate Dissociation.

M. MESAROS; G. BILMES; J. A. ROSSO; M. C. GONZALEZ; D. O. MÁRTIRE

CHEMICAL PHYSICS LETTERS

ELSEVIER SCIENCE BV

Año: 2003 p. 176 - 181

0009-2614

Photoacoustic measurements as a function of temperature in the range (294.1–308.2) K were used to determine the enthalpy and volume changes for the photoinduced dissociation at 266 nm of peroxodiphosphate ions in water. The analysis of the data, which considered the temperature dependence of the photodissociation quantum yield and of the thermoelastic parameters of the medium, yielded enthalpy and volume changes of ð77 18Þ kJmol1 andð77 18Þ kJmol1 and ð12 1Þ mlmol1, respectively. These values are compared with those reported for other systems.12 1Þ mlmol1, respectively. These values are compared with those reported for other systems.