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Rieth T, Tober N, Limbach D, Haspel T, Sperner M, Schupp N, Wicker P, Glang S, Lehmann M, Detert H. Impact of Substitution Pattern and Chain Length on the Thermotropic Properties of Alkoxy-Substituted Triphenyl-Tristriazolotriazines. Molecules 2020; 25:E5761. [PMID: 33297382 PMCID: PMC7729490 DOI: 10.3390/molecules25235761] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/30/2020] [Accepted: 12/02/2020] [Indexed: 12/01/2022] Open
Abstract
Tristriazolotriazines (TTTs) with a threefold alkoxyphenyl substitution were prepared and studied by DSC, polarized optical microscopy (POM) and X-ray scattering. Six pentyloxy chains are sufficient to induce liquid-crystalline behavior in these star-shaped compounds. Thermotropic properties of TTTs with varying substitution patterns and a periphery of linear chains of different lengths, branching in the chain and swallow-tails, are compared. Generally, these disks display broad and stable thermotropic mesophases, with the tangential TTT being superior to the radial isomer. The structure-property relationships of the number of alkyl chains, their position, length and structure were studied.
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Affiliation(s)
- Thorsten Rieth
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Natalie Tober
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Daniel Limbach
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Tobias Haspel
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Marcel Sperner
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Niklas Schupp
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Philipp Wicker
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Stefan Glang
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
| | - Matthias Lehmann
- Institute for Organic Chemistry, Julius-Maximilians-University, 97074 Würzburg, Germany
| | - Heiner Detert
- Department for Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany; (T.R.); (N.T.); (D.L.); (T.H.); (M.S.); (N.S.); (P.W.); (S.G.)
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Affiliation(s)
- Heiner Detert
- Institute for Organic Chemistry; Johannes Gutenberg-University Mainz; Duesbergweg 10-14 55099 Mainz Germany
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Rieth T, Röder N, Lehmann M, Detert H. Isomerisation of Liquid-Crystalline Tristriazolotriazines. Chemistry 2018; 24:93-96. [PMID: 29112303 DOI: 10.1002/chem.201705095] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Indexed: 11/09/2022]
Abstract
Star-shaped discotic liquid crystals with columnar superstructures constitute a highly interesting class of organic materials. Phenyl-substituted tris[1,2,4]triazolo-[1,3,5]triazine, prepared by a Huisgen reaction of phenyltetrazole and cyanuric chloride, represents an excellent core for discotic liquid crystals (DLCs). The thermal stability is not perfect, at temperatures above the clearing point, a successive threefold isomerization leads to a highly planar, C3 -symmetrical isomer, which mainly differs in the orientation of the aryl substituents to the centre of the molecule. A new class of discotic liquid crystals has been obtained: Equipped with peripheral alkoxy chains both isomers can form broad thermotropic mesophases. The optical, thermal, and physical properties were investigated by polarized optical microscopy, differential scanning calorimetry, wide-angle X-ray scattering, UV/Vis absorption and fluorescence spectroscopic measurements. The thermotropic properties are decisively affected by the molecular structure of the isomers, isomerisation leads to higher melting points but also the loss or even gain of mesomorphism is observed.
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Affiliation(s)
- Thorsten Rieth
- Institute for Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55099, Mainz, Germany
| | - Nico Röder
- Institute for Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55099, Mainz, Germany
| | - Matthias Lehmann
- Institut für Organische Chemie, Julius-Maximilians-Universität, Am Hubland, 97074, Würzburg, Germany
| | - Heiner Detert
- Institute for Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55099, Mainz, Germany
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Wöhrle T, Wurzbach I, Kirres J, Kostidou A, Kapernaum N, Litterscheidt J, Haenle JC, Staffeld P, Baro A, Giesselmann F, Laschat S. Discotic Liquid Crystals. Chem Rev 2015; 116:1139-241. [PMID: 26483267 DOI: 10.1021/acs.chemrev.5b00190] [Citation(s) in RCA: 418] [Impact Index Per Article: 46.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tobias Wöhrle
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Iris Wurzbach
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Jochen Kirres
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Antonia Kostidou
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Nadia Kapernaum
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Juri Litterscheidt
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Johannes Christian Haenle
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Peter Staffeld
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Angelika Baro
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Frank Giesselmann
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Sabine Laschat
- Institut für Organische Chemie, and ‡Institut für Physikalische Chemie, Universität Stuttgart , Pfaffenwaldring 55, 70569 Stuttgart, Germany
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Glang S, Rieth T, Borchmann D, Fortunati I, Signorini R, Detert H. Arylethynyl-Substituted Tristriazolotriazines: Synthesis, Optical Properties, and Thermotropic Behavior. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400088] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Rieth T, Marszalek T, Pisula W, Detert H. Thermotropic Properties and Molecular Packing of Discotic Tristriazolotriazines with Rigid Substituents. Chemistry 2014; 20:5000-6. [DOI: 10.1002/chem.201400034] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Indexed: 11/06/2022]
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