Chiral cyclic trinuclear gold(I) complexes with a helical columnar phase

Autor: Joaquín Barberá, Anabel Elduque, José Luis Serrano, Raquel Giménez, Eduardo Beltrán
Přispěvatelé: Gobierno de Aragón, European Commission, Ministerio de Economía y Competitividad (España)
Rok vydání: 2014
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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ISSN: 1099-0682
1434-1948
Popis: Cyclic trinuclear gold(I) complexes with chiral 3,5-diarylpyrazolate ligands have been synthesized and characterized with the aim of obtaining helical columnar liquid-crystal phases as a way to control the stacking geometry and orientation of the trigold metallacycle in the bulk phase. The compounds bear n-decyloxy- and/or (S)-3,7-dimethyloctyloxy terminal groups in a number varying from twelve to eighteen. The compounds behave like isotropic glasses, crystalline solids, or columnar liquid crystals (of hexagonal or rectangular symmetry), with isotropization temperatures close to room temperature. In the case of the compound bearing nine n-decyloxy- and nine (S)-3,7-dimethyloctyloxy terminal groups, a helical columnar phase is obtained that exhibits a well-formed hexagonal bidimensional lattice made of columns that consist of molecules stacked at regular distances and mutually rotated by 40° in a helical mode. Thin films display emission bands at room temperature in the blue region of the visible spectra, regardless of the phase or the molecular structure.
The authors thank the Gobierno de Aragón and European Union, Fondo Social Europeo (FSE) (project PI109/09, research group E04), and the Spanish Ministerio de Economia y Competitividad (MINECO) and European Union (EU), Fondo Europeo para el Desarrollo Regional (FEDER) (project numbers CTQ2012-35692, CTQ2011-22516, and MAT2012-38538-CO3-01) for financial support.
Databáze: OpenAIRE
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