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Single‐Crystal‐to‐Single‐Crystal Transition in an Enantiopure [7]Helquat Salt: The First Observation of a Reversible Phase Transition in a Helicene‐Like Compound
Author(s) -
Nath Naba K.,
Severa Lukáš,
Kunetskiy Roman A.,
Císařová Ivana,
Fulem Michal,
Růžička Květoslav,
Koval Dušan,
Kašička Václav,
Teplý Filip,
Naumov Panče
Publication year - 2015
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.201502094
Subject(s) - differential scanning calorimetry , helicene , enantiopure drug , phase transition , crystallography , single crystal , materials science , crystal (programming language) , diffraction , phase (matter) , chemistry , optics , organic chemistry , molecule , thermodynamics , physics , computer science , programming language , enantioselective synthesis , catalysis
Here it is reported that crystals of an enantiopure [7]helquat salt undergo reversible thermal solid–solid phase transition at 404 K. Differential scanning calorimetry (DSC), capillary electrophoresis (CE), and X‐ray diffraction analysis were used to unravel the mechanistic details of this process. The single‐crystal‐to‐single‐crystal course enabled direct monitoring of the structural changes by in situ variable‐temperature X‐ray diffraction, thus providing the first direct evidence of a solid phase transition in a helicene‐like compound.