TY  - 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 . .