Bolaamphiphilic liquid crystals based on bis-imidazolium cations

Content Provider	Semantic Scholar
Author	Abbas, Alexandre Al Heinrich, Benoît Her, Matthieu L’ Couzigné, Emilie Welter, Richard Douce, Laurent
Copyright Year	2017
Abstract	Syntheses are reported for new bolaform ionic liquids 2a–f containing the cyanometallate anions [Ag(CN)2]− (2a), [Ni(CN)4]2− (2b), [Pt(CN)4]2− (2c), [Co(CN)6]3− (2d), [Fe(CN)6]3− (2e) and [Fe(CN)6]4− (2f), respectively, associated with a bis(imidazolium) dication. Except for those containing the square-planar nickelate and platinite anions, all the compounds displayed thermotropic behaviour, exhibiting lamellar smectic A phases. The mesomorphic behavior and phase transition temperatures were investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS). To investigate the nature anion influence on its interactions with the cation, crystal structures from single crystal X-ray diffraction have been obtained for both [Ag(CN)2]− and [Ni(CN)4]2− derivatives. These studies showed that the square planar Ni anion disrupts the lateral cohesion of the ionic layers. This may explain the loss of liquid crystal behavior in this case and Pt salt.
Starting Page	2604
Ending Page	2613
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1039/C6NJ03590F
Alternate Webpage(s)	http://www.rsc.org/suppdata/c6/nj/c6nj03590f/c6nj03590f1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C6NJ03590F
Volume Number	41
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article