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Insight into Solid‐State Entropy from Diffraction Data
Author(s) -
Madsen Anders Østergaard,
Larsen Sine
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200702423
Subject(s) - ribitol , xylitol , molecule , solid state , chemistry , diffraction , crystallography , diastereomer , thermal motion , entropy (arrow of time) , thermodynamics , physics , stereochemistry , organic chemistry , quantum mechanics , fermentation , enzyme
Molecules in motion : The two diastereomeric pentoses ribitol and xylitol differ in that the higher melting isomer, ribitol (see picture, red O, white H) is less dense. Accurate high‐resolution diffraction data is used to show that this is an entropy effect caused by a difference between them in the librational motion L1. Their solid‐state entropies, calculated from the rigid‐body vibrations, are in agreement with calorimetric results.