Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases
Само за регистроване кориснике
2008
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Star-shaped mesogens with a phloroglucinol or a trimesic acid core and oligobenzoate arms with up to five repeating units have been synthesised. non-conventional mesogens form various columnar mesophases over a broad temperature range. The liquid-crystal phases were characterised by optical microscopy, differential scanning calorimetry, X-ray diffraction, dilatometry and solid-state NMR spectroscopy. In addition to the high-temperature hexagonal columnar phases, the columnar self-assemblies undulate upon cooling and consequently form higher-ordered body-centred orthorhombic columnar 3D structures. A model of E-shaped folded conformers helically displaced along the columns is proposed. Helical preorganisation in the hexagonal phase precedes the transition to the low-temperature phases. Space filling and nano-segregation compete in the self-organisation process, thus aliphatic chains and the polar oligobenzoate scaffold are not perfectly separated in these star-shaped mesogens.
Кључне речи:
x-ray diffraction / star-shaped mesogens / solid-state NMR spectroscopy / oligobenzoates / liquid crystalsИзвор:
Chemistry-A European Journal, 2008, 14, 12, 3562-3576Издавач:
- Wiley-V C H Verlag Gmbh, Weinheim
DOI: 10.1002/chem.200700922
ISSN: 0947-6539
PubMed: 18300216
WoS: 000255702800011
Scopus: 2-s2.0-45449113523
Институција/група
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Lehmann, Matthias AU - Jahr, Michael AU - Donnio, Bertrand AU - Graf, Robert AU - Gemming, Sibylle AU - Popov, Igor PY - 2008 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/291 AB - Star-shaped mesogens with a phloroglucinol or a trimesic acid core and oligobenzoate arms with up to five repeating units have been synthesised. non-conventional mesogens form various columnar mesophases over a broad temperature range. The liquid-crystal phases were characterised by optical microscopy, differential scanning calorimetry, X-ray diffraction, dilatometry and solid-state NMR spectroscopy. In addition to the high-temperature hexagonal columnar phases, the columnar self-assemblies undulate upon cooling and consequently form higher-ordered body-centred orthorhombic columnar 3D structures. A model of E-shaped folded conformers helically displaced along the columns is proposed. Helical preorganisation in the hexagonal phase precedes the transition to the low-temperature phases. Space filling and nano-segregation compete in the self-organisation process, thus aliphatic chains and the polar oligobenzoate scaffold are not perfectly separated in these star-shaped mesogens. PB - Wiley-V C H Verlag Gmbh, Weinheim T2 - Chemistry-A European Journal T1 - Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases EP - 3576 IS - 12 SP - 3562 VL - 14 DO - 10.1002/chem.200700922 ER -
@article{ author = "Lehmann, Matthias and Jahr, Michael and Donnio, Bertrand and Graf, Robert and Gemming, Sibylle and Popov, Igor", year = "2008", abstract = "Star-shaped mesogens with a phloroglucinol or a trimesic acid core and oligobenzoate arms with up to five repeating units have been synthesised. non-conventional mesogens form various columnar mesophases over a broad temperature range. The liquid-crystal phases were characterised by optical microscopy, differential scanning calorimetry, X-ray diffraction, dilatometry and solid-state NMR spectroscopy. In addition to the high-temperature hexagonal columnar phases, the columnar self-assemblies undulate upon cooling and consequently form higher-ordered body-centred orthorhombic columnar 3D structures. A model of E-shaped folded conformers helically displaced along the columns is proposed. Helical preorganisation in the hexagonal phase precedes the transition to the low-temperature phases. Space filling and nano-segregation compete in the self-organisation process, thus aliphatic chains and the polar oligobenzoate scaffold are not perfectly separated in these star-shaped mesogens.", publisher = "Wiley-V C H Verlag Gmbh, Weinheim", journal = "Chemistry-A European Journal", title = "Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases", pages = "3576-3562", number = "12", volume = "14", doi = "10.1002/chem.200700922" }
Lehmann, M., Jahr, M., Donnio, B., Graf, R., Gemming, S.,& Popov, I.. (2008). Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases. in Chemistry-A European Journal Wiley-V C H Verlag Gmbh, Weinheim., 14(12), 3562-3576. https://doi.org/10.1002/chem.200700922
Lehmann M, Jahr M, Donnio B, Graf R, Gemming S, Popov I. Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases. in Chemistry-A European Journal. 2008;14(12):3562-3576. doi:10.1002/chem.200700922 .
Lehmann, Matthias, Jahr, Michael, Donnio, Bertrand, Graf, Robert, Gemming, Sibylle, Popov, Igor, "Star-shaped oligobenzoates: Non-conventional mesogens forming columnar helical mesophases" in Chemistry-A European Journal, 14, no. 12 (2008):3562-3576, https://doi.org/10.1002/chem.200700922 . .