Re-entrant isotropic phase between lamellar and columnar mesophases.
Tetradental cis-enaminoketone Ni (II) complexes with different molecular shape have been synthesized. Intramolecular hydrogen bonds, which stiffen the mesogenic core and restrict rotation of some molecular parts, have been introduced in these compounds. In the case of molecules with two hydrogen bonds and alkoxy terminal chains filling the inner molecular space, the uncommon phase sequence Iso-D(h)-Iso(re)-SmA (series III-3) was detected. For the first time, it was observed that the isotropic re-entrant (Iso(re)) phase (short-range order) is separating the columnar (D) (high-temperature) and the lamellar (SmA) (low-temperature) phases, both revealing long-range ordered structures.
Chemistry Department, Warsaw University, Laboratory of Dielectrics and Magnetics, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland.
Urszula
U
Pietrasik
Jadwiga
J
Szydłowska
Adam
A
Krówczyński
Damian
D
Pociecha
Ewa
E
Górecka
Daniel
D
Guillon