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

0449359 - ÚOCHB 2016 RIV DE eng J - Journal Article
Nath, N. K. - Severa, Lukáš - Kunetskiy, Roman Alexejevič - Císařová, I. - Fulem, M. - Růžička, K. - Koval, Dušan - Kašička, Václav - Teplý, Filip - Naumov, P.
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.
Chemistry - A European Journal. Roč. 21, č. 39 (2015), s. 13508-13512. ISSN 0947-6539. E-ISSN 1521-3765
R&D Projects: GA ČR GA13-19213S; GA ČR GA13-32974S; GA ČR(CZ) GA13-17224S
Grant - others:GA AV ČR(CZ) M200551208
Institutional support: RVO:61388963
Keywords : chirality * helicene * phase transitions * polymorphism * X-ray diffraction
Subject RIV: CC - Organic Chemistry
Impact factor: 5.771, year: 2015

Here it is reported that crystals of an enantiopure [7]helquat salt undergo reversible thermal solid-solid phase transition at 404K. 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.
Permanent Link: http://hdl.handle.net/11104/0251098