Molecular factors responsible for the formation of the axially polar columnar mesophase Col(h)P(A).
The structure of hexacatenar bent-shape molecules has been systematically modified in order to determine the main molecular factors responsible for the appearance of the axially polar columnar mesophase. It was found that the stability of the polar phase is very sensitive to the subtle modifications of the molecular shape: the phase is solely preserved if the modification is made at the terminal parts of the mesogenic core, whilst any other modifications destabilize the phase. It can be concluded that the main factor driving the transition between the phase made of flat supramolecular discs and the axially polar phase made of the cone-like units is the ability to fulfill close packing conditions in order to eliminate voids between neighboring molecular rigid cores.
Matraszek
Joanna
J
Department of Chemistry, Warsaw University, ul. Pasteura 1, 02-093 Warsaw, Poland.
Mieczkowski
Jozef
J
Pociecha
Damian
D
Gorecka
Ewa
E
Donnio
Bertrand
B
Guillon
Daniel
D
D050866:Liquid Crystals / Q000737:chemistry; D008956:Models, Chemical; D011083:Polycyclic Compounds / Q000138:chemical synthesis*; D013696:Temperature; D014961:X-Ray Diffraction
D011083:Polycyclic Compounds