Artykuł w czasopiśmie
Brak miniatury
Licencja
CC-BY - Uznanie autorstwaTwist-bend nematogenic supramolecular dimers and trimers formed by hydrogen bonding
| dc.abstract.en | A selection of novel non-symmetric supramolecular liquid crystal dimers and trimers formed by hydrogen-bonding have been prepared and their phase behaviour characterised by polarised optical microscopy, X-ray diffraction and temperature-dependent Fourier-transform infrared spectroscopy. We mix the bent twist-bend nematogen 4-[6-(4’-cyanobiphenyl-4-yl) hexyloxy]-benzoic acid (CB6OBA) with a series of small stilbazole-based compounds 4-[(E)-2-(n-alkoxyphenyl)ethenyl]pyridines (nOS) of varying terminal chain length (n) to obtain the CB6OBA:nOS complexes. Complexes with n ≤ 7 exhibit nematic and twist-bend nematic behaviour, followed on cooling by a smectic C phase for n = 4–7, and finally, a hexatic-type smectic X phase for n = 3–7. Mixtures with n = 8–10 exhibit a smectic A phase below the conventional nematic phase, and on further cooling, a biaxial smectic Ab phase and the same hexatic-type SmX phase. Supramolecular trimers, CB6OBA:CB6OS and CB6OBA:1OB6OS, formed between CB6OBA and dimeric stilbazoles [(E)-2-(4-{[6-(4’-methoxy[1,1’-biphenyl]-4-yl)hexyl]oxy}phenyl)ethenyl]pyridine (1OB6OS) or 4-[(E)-4’-(6-{4-[(E)-2-(pyridin-4-yl)ethenyl]phenoxy}hexyl)[1,1’-biphenyl]-4-carbonitrile (CB6OS), exhibit nematic and twist-bend nematic phases, and are the first hydrogen-bonded trimers consisting of unlike donor and acceptor fragments to do so. |
| dc.affiliation | Uniwersytet Warszawski |
| dc.contributor.author | Pociecha, Damian |
| dc.contributor.author | Walker, R. |
| dc.contributor.author | Martinez-Felipe, A. |
| dc.contributor.author | Storey, J.M.D. |
| dc.contributor.author | Imrie, C.T. |
| dc.contributor.author | Górecka, Ewa |
| dc.date.accessioned | 2024-01-26T11:08:10Z |
| dc.date.available | 2024-01-26T11:08:10Z |
| dc.date.copyright | 2020-03-06 |
| dc.date.issued | 2020 |
| dc.description.accesstime | AT_PUBLICATION |
| dc.description.finance | Publikacja bezkosztowa |
| dc.description.number | 3 |
| dc.description.version | FINAL_PUBLISHED |
| dc.description.volume | 10 |
| dc.identifier.doi | 10.3390/CRYST10030175 |
| dc.identifier.issn | 2073-4352 |
| dc.identifier.uri | https://repozytorium.uw.edu.pl//handle/item/123926 |
| dc.language | eng |
| dc.pbn.affiliation | chemical sciences |
| dc.relation.ispartof | Crystals |
| dc.relation.pages | 175 |
| dc.rights | CC-BY |
| dc.sciencecloud | nosend |
| dc.subject.en | Hydrogen-bonding |
| dc.subject.en | Liquid crystals |
| dc.subject.en | Spontaneous symmetry breaking |
| dc.subject.en | Supramolecular dimers |
| dc.subject.en | Supramolecular liquid crystals |
| dc.subject.en | Supramolecular trimmers |
| dc.subject.en | Twist-bend nematic phase |
| dc.title | Twist-bend nematogenic supramolecular dimers and trimers formed by hydrogen bonding |
| dc.type | JournalArticle |
| dspace.entity.type | Publication |