[closo-1-CB11H11-1-Ph]− as a structural element for ionic liquid crystals

• Published in: Journal of organometallic chemistry Vol. 747; pp. 195 - 200
• Main Authors: Jankowiak, Aleksandra, Kanazawa, Junichiro, Kaszynski, Piotr, Takita, Ryo, Uchiyama, Masanobu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2013
• Subjects: Boron clusters; Ion pairs; Liquid crystals; Structure–property relationship; Boron clusters; Liquid crystals; Ion pairs; Structure–property relationship
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/j.jorganchem.2013.05.034

Ion pairs 2[Pyr] and 3[Pyr] containing [closo-1-CB11H11-1-Ph]− as the structural element were synthesized and their liquid crystalline properties were investigated by thermal and optical methods. Their mesogenic behavior was compared to that of the analogous series 1[Pyr] having a COO linking group between the benzene ring and the cluster, and the observed structure–property relationships are discussed in the context of general trends in related non-ionic liquid crystals. •Derivatives of the [closo-1-CB11H11-1-Ph]− anion form SmA ionic liquid crystals (ILC).•The mesophase is destabilized in derivatives of [closo-1-CB11H11-1-Ph]− relative to [closo-1-CB11H11-1-COOPh]−.•Increasing the chain length increases the SmA phase stability and range.•Structure–property relationships in ILC follow those found in non-ionic analogues. Ions pairs of anisometric anion, derived from [closo-1-CB11H11-1-Ph]−, and substituted pyridinium cation exhibit a SmA phase. [Display omitted]