ISSN:
1572-8927
Keywords:
Praseodymium
;
diglycolate
;
complexation
;
free energy
;
high temperature
;
spectroscopy
;
fiber-optics
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Instrumentation has been developed to perform liquid-phase optical absorption spectroscopy at elevated temperature within the restricted enclosure of a high-level radioactivity glovebox. Absorbance measurements of the praseodymium-diglycolate complex allowed the determination of thermodynamic stability constants for two or three metal-ligand complexes at temperatures of 23, 50, 65, 80, and 95°C and an ionic strength of IM (NaClO4). Agreement of these results with prior literature values at 25 and 50°C is very good and demonstrates the validity of the present technique. Over the temperature range of 5 to 95°C, the variation of the free energy of complexation is adequately described by functions linear with temperature for all three complexes. Reaction enthalpies and entropies were calculated from the data via the van't Hoff equation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647018
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