Metallomesogens Modified by Hydrogen Bonds or by Bridging Groups-New Re-entrant Isotropic Phase

Two series of tetradental cis-enaminoketone Ni(II) complexes with triangular mesogenic core stiffened by external ethylene or methylene units have been synthesized. One of the obtained compounds reveals a unique phase sequence: Iso-Colh-Isore. The enormously stable Colh phase has been detected for metallomesogens having both an external methylene unit and inner hydrogen bonds. Also a new synthetic way to receive 5,6-dialkoxy-7-hydroxyindanone has been presented