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Optically active, mesogenic lanthanide complexes: design, synthesis and characterisation

Research output: Contribution to journalArticle

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Author(s)

  • Channabasaveshwar V. Yelamaggad
  • Rashmi Prabhu
  • Govindaswamy Shanker
  • Duncan W. Bruce

Department/unit(s)

Publication details

JournalLIQUID CRYSTALS
DatePublished - Mar 2009
Issue number3
Volume36
Number of pages9
Pages (from-to)247-255
Original languageEnglish

Abstract

The synthesis, molecular structural characterisation and mesomorphic behaviour of lanthanidomesogens with the formula [LnL(LH)2][X]2 are reported. These mesogens were derived from ligands (LH-n) formed by covalently linking the pro-mesogenic cholesterol segment with the N-(n-decyl)salicylaldimine core through either an even-parity (4-oxybutanoyloxy/6-oxyhexanoyloxy/8-oxyoctanoyloxy) or an odd-parity (5-oxypentano-yloxy) spacer. These ligands were designed based on the recently conceived concept of decoupling the anisometric segment from the metal-coordinating site by a flexible spacer to account for the stabilisation of nematic and/or smectic phases at lower temperatures. The even parity spacer ligands are polymesomorphic whereas the odd parity analogue exhibits only the chiral nematic phase. In contrast, the complexes display solely the smectic A phase indicating that the variation in the nature of lanthanide has no influence on the general phase behaviour of the complexes. The clearing temperatures of both the ligands and the complexes display an odd-even effect; the even members show relatively higher transition temperatures.

    Research areas

  • cholesterol, salicylaldimine, chiral ligands, lanthanidomesogens, polymesomorphism, smectic A phase, CONTAINING LIQUID-CRYSTALS, DIMESOGENIC BIDENTATE LIGANDS, COLUMNAR MESOPHASES, METAL-COMPLEXES, METALLOMESOGENS, CU(II)

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