Room-Temperature Discotic Nematic Liquid Crystals over a Wide Temperature Range: Alkali-Metal-Ion-Induced Phase Transition from Discotic Nematic to Columnar Phases
作者:Shigeo Kohmoto、Emiko Mori、Keiki Kishikawa
DOI:10.1021/ja073962f
日期:2007.11.1
Triphenylene derivatives possessing poly(ethylene oxide) (PEO) units exhibited discoticnematic (ND) phases at room temperature. Unique phase transition from a ND phase to a hexagonal columnar (Colh) phase was triggered by the addition of alkali metal salts. This phase transition was dependent on the type of the counterion of alkali metal salts added.
The process of discovery for highly potent prostaglandin D-2 (PGD(2)) receptor antagonists is reported. A series of N-(p-alkoxy)benzoyl-2-methylindole-4-acetic acids were synthesized and identified as a new class of selective PGD(2) receptor antagonists. Most of them exhibited strong PGD(2) receptor antagonism in binding studies and the cAMP formation assay. The structure-activity relationships (SAR), including subtype selectivity of the synthesized compounds, are also discussed. (C) 2004 Elsevier Ltd. All rights reserved.