π-Conjugated ionic liquid crystals are a very interesting class of salts where the coupling of ionic and electronic functions with the anisotropy typical of liquid crystals may give rise to materials with advanced bulk properties. Defect-free active thin films obtainable by simplemesophase self-assembly of these materials may be exploited in a number of different electro-optical devices. Here we show that the rich mesomorphism of the thienoviologen salts 4,4′-(2,2′-bithiophene-5,5′-diyl)bis(1-alkylpyridinium), which includes smectic, columnar, and nematic phases, significantly depends on the counterion type and the length of the promesogenic alkyl chains, highlighting the delicate balance among ion/ion, π−π stacking, and hydrophobic interactions. These salts show notable fluorescence properties in the bulk, strongly dependent on the self-assembling.
Mesophase Tuning in Discotic Dimers π-Conjugated Ionic Liquid Crystals through Supramolecular Interactions and the Thermal History / Veltri, Lucia; Maltese, Vito; Auriemma, Finizia; Santillo, Chiara; Cospito, Sante; La Deda, Massimo; Chidichimo, Giuseppe; Gabriele, Bartolo; DE ROSA, Claudio; Beneduci, Amerigo. - In: CRYSTAL GROWTH & DESIGN. - ISSN 1528-7483. - 16:10(2016), pp. 5646-5656. [10.1021/acs.cgd.6b00441]
Mesophase Tuning in Discotic Dimers π-Conjugated Ionic Liquid Crystals through Supramolecular Interactions and the Thermal History
AURIEMMA, FINIZIA;SANTILLO, CHIARA;DE ROSA, CLAUDIO;
2016
Abstract
π-Conjugated ionic liquid crystals are a very interesting class of salts where the coupling of ionic and electronic functions with the anisotropy typical of liquid crystals may give rise to materials with advanced bulk properties. Defect-free active thin films obtainable by simplemesophase self-assembly of these materials may be exploited in a number of different electro-optical devices. Here we show that the rich mesomorphism of the thienoviologen salts 4,4′-(2,2′-bithiophene-5,5′-diyl)bis(1-alkylpyridinium), which includes smectic, columnar, and nematic phases, significantly depends on the counterion type and the length of the promesogenic alkyl chains, highlighting the delicate balance among ion/ion, π−π stacking, and hydrophobic interactions. These salts show notable fluorescence properties in the bulk, strongly dependent on the self-assembling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.