Premium
Structural Collapse of the Hydroquinone–Formic Acid Clathrate: A Pressure‐Medium‐Dependent Phase Transition
Author(s) -
Eikeland Espen,
Thomsen Maja K.,
Madsen Solveig R.,
Overgaard Jacob,
Spackman Mark A.,
Iversen Bo. B.
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504908
Subject(s) - intermolecular force , clathrate hydrate , chemical physics , phase transition , supramolecular chemistry , hydroquinone , phase (matter) , chemistry , molecule , crystallography , crystal structure , materials science , thermodynamics , hydrate , organic chemistry , physics
The energy landscape governing a new pressure‐induced phase transition in the hydroquinone–formic acid clathrate is reported in which the host structure collapses, opening up the cavity channels within which the guest molecules migrate and order. The reversible isosymmetric phase transition causes significant changes in the morphology and the birefringence of the crystal. The subtle intermolecular interaction energies in the clathrate are quantified at varying pressures using novel model energies and energy frameworks. These calculations show that the high‐pressure phase forms a more stable host network at the expense of less‐stable host–guest interactions. The phase transition can be kinetically hindered using a nonhydrostatic pressure‐transmitting medium, enabling the comparison of intermolecular energies in two polymorphic structures in the same pressure range. Overall this study illustrates a need for accurate intermolecular energies when analyzing self‐assembly structures and supramolecular aggregates.