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Heinz P, Hindelang K, Golosova A, Papadakis CM, Rieger B. Self-assembly of linear and cyclic siloxane-containing mesogens: investigation of layered structures in bulk and thin films. Chemphyschem 2011; 12:3591-603. [PMID: 22052820 DOI: 10.1002/cphc.201100301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 09/05/2011] [Indexed: 11/08/2022]
Abstract
Silicon-containing materials which possess the ability to form mesophases are promising systems for applications in the fields of electro-optical devices, nonlinear optics, and information storage media. In this work, the formation of supramolecular assemblies of a series of low molecular weight siloxane-containing mesogens is presented. Besides a novel synthesis route via Ru(II) -catalyzed hydrosilylation of phenyl acetylene derivatives, mesophase characterization by modern analysis techniques is performed. As linker groups, leading to bi- and tetramesogens, linear disiloxane and cyclic tetrasiloxane are utilized. In the resulting class of materials, high thermal stability, induced by the formation of layered smectic-type structures, is predominant. The smectic-type phases were found to be monotropic. Layer distances in the assemblies, as well as the phase transition temperatures, can be controlled by the substitution motif on the mesogens (number and length of alkyl chains). In spin-cast thin films, the layered domains are visualized by atomic force microscopy; furthermore, domain dimensions and electron densities are determined by grazing-incidence small-angle X-ray scattering.
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Affiliation(s)
- Paul Heinz
- Institut für Siliciumchemie, WACKER-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching bei München, Germany
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Iinuma R, Narsi Reddy P, Hayashi T, Tanaka M. Exhaustive and partial alkoxylation of polymethylhydrosiloxane by copper-catalyzed dehydrocoupling with alcohols: Synthesis, crosslinking behavior, and thermal properties of the products. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kaneko K, Miwa Y, Nakamura N. Phase transition behavior and electro-rheological effect of liquid crystalline cyclic-siloxanes with fluorine atoms. J Appl Polym Sci 2007. [DOI: 10.1002/app.26437] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Korenic EM, Jacobs SD, Fare SM, Li L. Cholesteric Liquid Crystal Flakes — A New Form of Domain. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259808047116] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Eileen M. Korenic
- a Laboratory for Laser Energetics, University of Rochester , 250 East River Road, Rochester , NY , 14623-1299
| | - Stephen D. Jacobs
- a Laboratory for Laser Energetics, University of Rochester , 250 East River Road, Rochester , NY , 14623-1299
| | - Sadeg M. Fare
- b Reveo, Inc. , #8 Skyline Drive, Hawthorne , NY , 10532
| | - Le Li
- b Reveo, Inc. , #8 Skyline Drive, Hawthorne , NY , 10532
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Synthesis of new stereoregular 2,4,6,8-tetraphenylcyclotetrasiloxanes with mesogenic groups and the influence of spatial isomerism on the phase state of individual isomers and their mixtures. Russ Chem Bull 2004. [DOI: 10.1007/s11172-005-0059-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang H, Jin MY, Jarnagin RC, Bunning TJ, Adams W, Cull B, Shi Y, Kumar S, Samulski ET. Thermally stable nonlinear optical activity in a smectic-A liquid crystal. Nature 1996. [DOI: 10.1038/384244a0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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De Rosa ME, Adams WW, Bunning TJ, Shi H, Chen SH. Dynamic Mechanical Relaxation Behavior of Low Molecular Weight Side-Chain Cyclic Liquid Crystalline Compounds near the Glass Transition Temperature. Macromolecules 1996. [DOI: 10.1021/ma951773o] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael E. De Rosa
- Wright Laboratory, Materials Directorate, WL/MLPJ, 3005 P Street Suite 1, Wright-Patterson AFB, Ohio 45433-7702, Science Applications International Corporation, 101 Woodman Drive, Suite 103, Dayton, Ohio 45431, and Center for Optoelectronics and Imaging, University of Rochester, Rochester, New York 14623-1212
| | - W. Wade Adams
- Wright Laboratory, Materials Directorate, WL/MLPJ, 3005 P Street Suite 1, Wright-Patterson AFB, Ohio 45433-7702, Science Applications International Corporation, 101 Woodman Drive, Suite 103, Dayton, Ohio 45431, and Center for Optoelectronics and Imaging, University of Rochester, Rochester, New York 14623-1212
| | - Timothy J. Bunning
- Wright Laboratory, Materials Directorate, WL/MLPJ, 3005 P Street Suite 1, Wright-Patterson AFB, Ohio 45433-7702, Science Applications International Corporation, 101 Woodman Drive, Suite 103, Dayton, Ohio 45431, and Center for Optoelectronics and Imaging, University of Rochester, Rochester, New York 14623-1212
| | - Hongqin Shi
- Wright Laboratory, Materials Directorate, WL/MLPJ, 3005 P Street Suite 1, Wright-Patterson AFB, Ohio 45433-7702, Science Applications International Corporation, 101 Woodman Drive, Suite 103, Dayton, Ohio 45431, and Center for Optoelectronics and Imaging, University of Rochester, Rochester, New York 14623-1212
| | - Shaw H. Chen
- Wright Laboratory, Materials Directorate, WL/MLPJ, 3005 P Street Suite 1, Wright-Patterson AFB, Ohio 45433-7702, Science Applications International Corporation, 101 Woodman Drive, Suite 103, Dayton, Ohio 45431, and Center for Optoelectronics and Imaging, University of Rochester, Rochester, New York 14623-1212
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