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.
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.
New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi (United Arab Emirates).
Naba K
NK
Nath
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6 (Czech Republic).
Lukáš
L
Severa
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6 (Czech Republic).
Roman A
RA
Kunetskiy
Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030/8, 128 43 Prague 2 (Czech Republic).
Ivana
I
Císařová
Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6 (Czech Republic).
Michal
M
Fulem
Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6 (Czech Republic).
Květoslav
K
Růžička
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6 (Czech Republic).
Dušan
D
Koval
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6 (Czech Republic).
Václav
V
Kašička
Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v. v. i., Flemingovo n. 2, 166 10 Prague 6 (Czech Republic). teply@uochb.cas.cz.
Filip
F
Teplý
New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi (United Arab Emirates). pn21@nyu.edu.
Panče
P
Naumov
X-ray diffraction; chirality; helicene; phase transitions; polymorphism