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Bajzíková K, Svoboda J, Novotná V, Pociecha D, Gorecka E. Bent-core mesogens with an aromatic unit at the terminal position. NEW J CHEM 2017. [DOI: 10.1039/c6nj03908a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Bent-core liquid crystals with a naphthalene central unit and an aromatic ring at the terminal position of molecular chains were synthesised with the aim of enhancing nanosegregation.
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Affiliation(s)
- Kvetoslava Bajzíková
- Department of Organic Chemistry
- University of Chemistry and Technology
- CZ-166 28 Prague 6
- Czech Republic
| | - Jiří Svoboda
- Department of Organic Chemistry
- University of Chemistry and Technology
- CZ-166 28 Prague 6
- Czech Republic
| | - Vladimíra Novotná
- Institute of Physics
- Czech Academy of Sciences
- CZ-182 21 Prague 8
- Czech Republic
| | - Damian Pociecha
- Laboratory of Dielectrics and Magnetics
- Chemistry Department
- Warsaw University
- 02-089 Warsaw
- Poland
| | - Ewa Gorecka
- Laboratory of Dielectrics and Magnetics
- Chemistry Department
- Warsaw University
- 02-089 Warsaw
- Poland
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2
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Martínez-Abadía M, Robles-Hernández B, de la Fuente MR, Giménez R, Ros MB. Photoresponsive Cyanostilbene Bent-Core Liquid Crystals as New Materials with Light-Driven Modulated Polarization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:6586-6591. [PMID: 27213889 DOI: 10.1002/adma.201600311] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 04/25/2016] [Indexed: 06/05/2023]
Abstract
Two isomeric cyanostilbene photoswitchable bent-core mesogens with polar liquid crystal phases in which macroscopic polarization and luminescence can be light-modulated are introduced. Z/E isomerization or [2+2] cycloaddition photochemical processes occur depending on the chemical structure, which make the compounds very innovative multifunctional advanced materials.
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Affiliation(s)
- Marta Martínez-Abadía
- Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica - Facultad de Ciencias, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain
| | - Beatriz Robles-Hernández
- Departamento de Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, 48080, Bilbao, Spain
| | - María Rosario de la Fuente
- Departamento de Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, 48080, Bilbao, Spain
| | - Raquel Giménez
- Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica - Facultad de Ciencias, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain
| | - Maria Blanca Ros
- Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica - Facultad de Ciencias, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain
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Westphal E, Gallardo H, Caramori GF, Sebastián N, Tamba MG, Eremin A, Kawauchi S, Prehm M, Tschierske C. Polar Order and Symmetry Breaking at the Boundary between Bent-Core and Rodlike Molecular Forms: When 4-Cyanoresorcinol Meets the Carbosilane End Group. Chemistry 2016; 22:8181-97. [DOI: 10.1002/chem.201503901] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Eduard Westphal
- Institute of Chemistry, Organic Chemistry; Martin Luther University Halle-Wittenberg, Kurt-Mothes-Strasse 2; 06120 Halle/Saale Germany
- Department of Chemistry; Federal University of Santa Catarina; 88040-900 Florianópolis Brazil
| | - Hugo Gallardo
- Department of Chemistry; Federal University of Santa Catarina; 88040-900 Florianópolis Brazil
| | | | - Nerea Sebastián
- Department of Nonlinear Phenomena, Institute for Experimental Physics; Otto von Guericke University Magdeburg, Universitätsplatz 2; 39106 Magdeburg Germany
| | - Maria-Gabriela Tamba
- Department of Nonlinear Phenomena, Institute for Experimental Physics; Otto von Guericke University Magdeburg, Universitätsplatz 2; 39106 Magdeburg Germany
| | - Alexey Eremin
- Department of Nonlinear Phenomena, Institute for Experimental Physics; Otto von Guericke University Magdeburg, Universitätsplatz 2; 39106 Magdeburg Germany
| | - Susumu Kawauchi
- Department of Organic & Polymeric Materials; Tokyo Institute of Technology, O-okayama, Meguro-ku; Tokyo 152-8552 Japan
| | - Marko Prehm
- Institute of Chemistry, Organic Chemistry; Martin Luther University Halle-Wittenberg, Kurt-Mothes-Strasse 2; 06120 Halle/Saale Germany
| | - Carsten Tschierske
- Institute of Chemistry, Organic Chemistry; Martin Luther University Halle-Wittenberg, Kurt-Mothes-Strasse 2; 06120 Halle/Saale Germany
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Kovářová A, Světlík S, Kozmík V, Svoboda J, Novotná V, Pociecha D, Gorecka E, Podoliak N. Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core. Beilstein J Org Chem 2014; 10:794-807. [PMID: 24778734 PMCID: PMC3999814 DOI: 10.3762/bjoc.10.75] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 03/19/2014] [Indexed: 12/03/2022] Open
Abstract
Bent-shaped mesogens possessing a biphenyl as a central core have been synthesized and the role of the terminal chain and the orientation of the ester as a linkage group have been investigated. For the studied molecular core we have established that both parameters play an important role for the mesomorphic properties. The polyfluoroalkyl terminal chain supports the formation of mesophases, and the introduction of a chiral lactate terminal chain destabilizes mesophases for the first type of mutual orientation of ester groups, attached to the central core. On the contrary, for the opposite orientation of esters, the terminal chain has no effect on the mesomorphic properties, and columnar phases have been found for all compounds. A unique phase sequence has been found for the mesogen with the fluorinated chain. A generalized tilted smectics, SmCG, have been observed in a temperature interval between two different lamellar SmCP phases and characterized by X-ray and dielectric measurements. The dielectric spectroscopy data are unique and presented for the first time in the SmCG phase providing new information about the molecular dynamics.
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Affiliation(s)
- Anna Kovářová
- Department of Organic Chemistry, Institute of Chemical Technology, CZ-166 28 Prague 6, Czech Republic. ; Tel: +420220444182
| | - Svatopluk Světlík
- Department of Organic Chemistry, Institute of Chemical Technology, CZ-166 28 Prague 6, Czech Republic. ; Tel: +420220444182
| | - Václav Kozmík
- Department of Organic Chemistry, Institute of Chemical Technology, CZ-166 28 Prague 6, Czech Republic. ; Tel: +420220444182
| | - Jiří Svoboda
- Department of Organic Chemistry, Institute of Chemical Technology, CZ-166 28 Prague 6, Czech Republic. ; Tel: +420220444182
| | - Vladimíra Novotná
- Institute of Physics, Academy of Science of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic
| | - Damian Pociecha
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Ewa Gorecka
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Natalia Podoliak
- Institute of Physics, Academy of Science of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic
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Folcia CL, Ortega J, Etxebarria J, Rodríguez-Conde S, Sanz-Enguita G, Geese K, Tschierske C, Ponsinet V, Barois P, Pindak R, Pan L, Liu ZQ, McCoy BK, Huang CC. Spontaneous and field-induced mesomorphism of a silyl-terminated bent-core liquid crystal as determined from second-harmonic generation and resonant X-ray scattering. SOFT MATTER 2014; 10:196-205. [PMID: 24651598 DOI: 10.1039/c3sm51277k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The polarity and structure of the phases of a liquid crystal constituted by thiophene-based bent-core molecules is investigated by means of optical second-harmonic generation (SHG), and resonant and conventional X-ray diffraction. The material studied is representative of a wide family of mesogens that contain silyl groups at the ends of the chains. These bulky terminal groups have been reported to give rise to smectic phases showing ferroelectric switching. However, the analysis of the SHG signal before and after application of electric fields has allowed us to establish unambiguously that the reported ferroelectricity is not intrinsic to the material but stabilized by the cell substrates once an electric field has been applied. In addition, the results obtained from resonant X-ray diffraction indicate that virgin samples have antiferroelectric undulated synclinic smectic structures.
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Affiliation(s)
- C L Folcia
- Department of Condensed Matter Physics, University of the Basque Country, UPV/EHU, 48080 Bilbao, Spain.
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Zhu L, Li X, Wu S, Nguyen KT, Yan H, Ågren H, Zhao Y. Chirality Control for in Situ Preparation of Gold Nanoparticle Superstructures Directed by a Coordinatable Organogelator. J Am Chem Soc 2013; 135:9174-80. [DOI: 10.1021/ja403722t] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Liangliang Zhu
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore
637371
| | - Xin Li
- Department of Theoretical
Chemistry
and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Shaojue Wu
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore
637371
| | - Kim Truc Nguyen
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore
637371
| | - Hong Yan
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore
637371
| | - Hans Ågren
- Department of Theoretical
Chemistry
and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Yanli Zhao
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore
637371
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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Lin SC, Ho RM, Chang CY, Hsu CS. Hierarchical Superstructures with Control of Helicity from the Self-Assembly of Chiral Bent-Core Molecules. Chemistry 2012; 18:9091-8. [DOI: 10.1002/chem.201200057] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Indexed: 11/11/2022]
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Gimeno N, Clemente MJ, Forcén P, Serrano JL, Ros MB. On the supramolecular packing of bent-shaped molecules: the influence of the central bent-core on the liquid crystalline behaviour. NEW J CHEM 2009. [DOI: 10.1039/b9nj00230h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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