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Ocak H, Karaağaç B, Akdaş-Kılıç H, Jeannin O, Camerel F, Bilgin Eran B. Synthesis and mesomorphic properties of new organosiloxane chiral calamitic liquid crystals. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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2
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Szyling J, Januszewski R, Jankowska K, Walkowiak J, Kownacki I, Franczyk A. Synthesis of bifunctional disiloxanes via subsequent hydrosilylation of alkenes and alkynes. Chem Commun (Camb) 2021; 57:4504-4507. [PMID: 33954327 DOI: 10.1039/d1cc01253c] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The first protocol for the synthesis of unsymmetrical bifunctional 1,1,3,3-tetramethyldisiloxane derivatives via subsequent hydrosilylation of alkenes and alkynes is presented. The methodology described has vast functional group tolerance and is extremely efficient towards the formation of novel disiloxane-based building blocks.
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Affiliation(s)
- Jakub Szyling
- Center for Advanced Technology, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, Poznań 61-614, Poland.
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3
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Januszewski R, Dutkiewicz M, Franczyk A, Kownacki I. Pt(0)-Catalysed synthesis of new bifunctional silanes. Dalton Trans 2020; 49:7697-7700. [PMID: 32510084 DOI: 10.1039/d0dt01668c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report herein very efficient syntheses of new functional silanes obtained via olefin hydrosilylation. New bifunctional compounds contain attractive functional groups such as epoxy, fluoroalkyl, trisilylamine, chloropropyl, and methacroiloxy which can play different roles in molecular systems. Moreover, the catalytic system proposed by us exhibits high selectivity and tolerance to a wide range of functional groups. It also permitted obtaining total conversions of the starting reagents in a relatively short time under mild conditions.
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Affiliation(s)
- Rafał Januszewski
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614, Poznan, Poland.
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Horčic M, Svoboda J, Novotná V, Pociecha D, Gorecka E. Bent-core dimers with top-to-bottom linkage between central units. RSC Adv 2018; 8:22974-22985. [PMID: 35540144 PMCID: PMC9081631 DOI: 10.1039/c8ra04108c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 06/18/2018] [Indexed: 11/21/2022] Open
Abstract
A structurally new type of core-to-core dimer with a top-to-bottom linkage between the central cores of bent molecules is presented. The structure of the bent-core molecules was modified by changing the length of the spacer between the central cores and terminal chains, by changing the type of linkage groups in the bent-core arms and by variation of the terminal chain polarity - introducing polyfluoroalkyl and oligosiloxane units. Additionally, the outer phenyl ring was substituted with three alkyl chains to mimic a polycatenar system. For all compounds the mesophase behaviour and structural parameters were established to gain information about the molecular structure-mesomorphic property relationship.
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Affiliation(s)
- Martin Horčic
- Department of Organic Chemistry, University of Chemistry and Technology CZ-166 28 Prague 6 Czech Republic +420220443688 +420220444288
| | - Jiří Svoboda
- Department of Organic Chemistry, University of Chemistry and Technology CZ-166 28 Prague 6 Czech Republic +420220443688 +420220444288
| | - Vladimíra Novotná
- Institute of Physics of the Czech Academy of Sciences Na Slovance 2, CZ-182 21 Prague 9 Czech Republic +420286890527 +420266053111
| | - Damian Pociecha
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University Al. Zwirki i Wigury 101 02-089 Warsaw Poland +48228221075 +48228221075
| | - Ewa Gorecka
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University Al. Zwirki i Wigury 101 02-089 Warsaw Poland +48228221075 +48228221075
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An efficient method for synthesizing monofunctionalized derivatives of 1,1,3,3-tetramethyldisiloxane in ionic liquids as recoverable solvents for rhodium catalyst. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2018.01.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Żak P, Bołt M, Pietraszuk C. Selective synthesis of E-vinylsilanes and E,E-divinylsilanes via platinum-catalyzed hydrosilylation of alkynes with secondary silanes. RSC Adv 2018; 8:40016-40021. [PMID: 35558240 PMCID: PMC9091181 DOI: 10.1039/c8ra08640k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 11/20/2018] [Indexed: 11/21/2022] Open
Abstract
A platinum(0) complex bearing a bulky N-heterocyclic carbene ligand enables selective formation of β-E-isomers of mono- and dialkenylsubstituted silanes.
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Affiliation(s)
- P. Żak
- Adam Mickiewicz University in Poznań
- Faculty of Chemistry
- 61-614 Poznań
- Poland
| | - M. Bołt
- Adam Mickiewicz University in Poznań
- Faculty of Chemistry
- 61-614 Poznań
- Poland
| | - C. Pietraszuk
- Adam Mickiewicz University in Poznań
- Faculty of Chemistry
- 61-614 Poznań
- Poland
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An efficient catalytic and solvent-free method for the synthesis of mono-organofunctionalized 1,1,3,3-tetramethyldisiloxane derivatives. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.06.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Horčic M, Svoboda J, Novotná V, Pociecha D, Gorecka E. Core-to-core dimers forming switchable mesophase. Chem Commun (Camb) 2017; 53:2721-2724. [PMID: 28197564 DOI: 10.1039/c6cc09983a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report structurally new type of dimers composed of bent-core molecules connected through their central cores by an alkylene spacer. Various self-assembling structures are discovered when prolonging the terminal alkyl chains in arms. Among diverse mesophases, the antiferroelectric type of switching under an applied electric field is observed.
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Affiliation(s)
- M Horčic
- Department of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech Republic.
| | - J Svoboda
- Department of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech Republic.
| | - V Novotná
- Institute of Physics, Academy of Science of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 9, Czech Republic.
| | - D Pociecha
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland.
| | - E Gorecka
- Laboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, Poland.
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Januszewski R, Kownacki I, Maciejewski H, Marciniec B, Szymańska A. An Efficient Catalytic Route for the Synthesis of Silane Coupling Agents Based on the 1,1,3,3‐Tetramethyldisiloxane Core. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601341] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rafał Januszewski
- Department of Organometallic Chemistry Faculty of Chemistry Adam Mickiewicz University in Poznań Umultowska 89b 61‐614 Poznan Poland
| | - Ireneusz Kownacki
- The Laboratory of the Chemistry and Technologies of Inorganic Polymers Adam Mickiewicz University in Poznań Umultowska 89b 61‐614 Poznan Poland
- Center for Advanced Technologies Adam Mickiewicz University in Poznań Umultowska 89c 61‐614 Poznań Poland
| | - Hieronim Maciejewski
- The Laboratory of the Chemistry and Technologies of Inorganic Polymers Adam Mickiewicz University in Poznań Umultowska 89b 61‐614 Poznan Poland
| | - Bogdan Marciniec
- Department of Organometallic Chemistry Faculty of Chemistry Adam Mickiewicz University in Poznań Umultowska 89b 61‐614 Poznan Poland
- Center for Advanced Technologies Adam Mickiewicz University in Poznań Umultowska 89c 61‐614 Poznań Poland
| | - Anna Szymańska
- The Laboratory of the Chemistry and Technologies of Inorganic Polymers Adam Mickiewicz University in Poznań Umultowska 89b 61‐614 Poznan Poland
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Horčic M, Svoboda J, Seidler A, Kozmík V, Novotná V, Pociecha D, Gorecka E. W-shaped liquid crystalline dimers. RSC Adv 2016. [DOI: 10.1039/c6ra06268g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We present a study of liquid crystalline bent-core dimers with a novel W-shaped molecular structure exhibiting broad polymorphism.
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Affiliation(s)
- Martin Horčic
- 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
| | - Arnošt Seidler
- Department of Organic Chemistry
- University of Chemistry and Technology
- CZ-166 28 Prague 6
- Czech Republic
| | - Václav Kozmík
- 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 9
- 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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4-[2-(Trimethylsilyl)ethynyl]benzoates: Synthesis and evaluation for mesomorphic properties of some novel calamitic molecules. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.09.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Balachandran R, Panov VP, Vij JK, Shanker G, Tschierske C, Merkel K, Kocot A. Dielectric and electro-optic studies of a bimesogenic liquid crystal composed of bent-core and calamitic units. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 90:032506. [PMID: 25314464 DOI: 10.1103/physreve.90.032506] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Indexed: 06/04/2023]
Abstract
A bimesogen, BR1, composed of a bent-core and calamitic unit, linked laterally via a flexible spacer is investigated by dielectric and electro-optic techniques. X-ray results show the presence of clusters in the nematic phase, and the cluster size is of the order of the thickness of a single layer. The splitting of the small-angle scattering Δχ/2 is about 50°, which indicates SmC like clusters with a significant tilt of the molecules in the quasilayers. The sign reversal of the dielectric anisotropy Δε' is observed as a function of frequency; the behavior is rather similar to that exhibited by the conventional dual frequency nematics, composed of a calamitic mesogen, with the exception that it occurs at much lower frequencies in this material. Interestingly, as the bimesogen enters its nematic phase, the average permittivity decreases as the temperature is lowered. This indicates the onset of antiparallel association of some of the dipoles in the system, and this type of association is much more prominent in BR1 in comparison to other bent-core liquid crystalline systems composed of the same bisbenzoate core unit. The analysis of the dielectric spectra using the Maier-Meier model confirms the onset of an antiparallel correlation of dipoles occurring at the isotropic to nematic phase transition temperature. Additionally these results support a model of the cluster where the transverse dipole moments in the neighboring layers are antiparalleled to each other.
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Affiliation(s)
- R Balachandran
- Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland
| | - V P Panov
- Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland and School of Physics and Astronomy, University of Manchester, M13 9PL Manchester, United Kingdom
| | - J K Vij
- Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland
| | - G Shanker
- Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Strasse 2, 06120 Halle, Germany and BMS R&D Centre, BMS College of Engineering, Bull Temple Road, Bangalore-560019, India
| | - C Tschierske
- Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Strasse 2, 06120 Halle, Germany
| | - K Merkel
- Central Mining Institute, Katowice, Poland
| | - A Kocot
- Institute of Physics, Silesian University, Katowice, Poland
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Shanker G, Prehm M, Tschierske C. Liquid-crystalline heterodimesogens and ABA-heterotrimesogens comprising a bent 3,5-diphenyl-1,2,4-oxadiazole central unit. Beilstein J Org Chem 2012; 8:472-85. [PMID: 22509219 PMCID: PMC3326627 DOI: 10.3762/bjoc.8.54] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Accepted: 03/07/2012] [Indexed: 11/23/2022] Open
Abstract
Three new types of terminally connected ABA-heterotrimesogens and heterodimesogens, composed of a bent 3,5-diphenyl-1,2,4-oxadiazole central unit and one or two rod-shaped 4-cyanobiphenyl cores or one 2-phenyl-1,3,4-thiadiazole core, connected by flexible spacers, have been synthesized, and their mesomorphic behavior was studied by optical polarizing microscopy (PM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). All dimesogens exhibit broad ranges of cybotactic nematic phases (N(cybA) and N(cybC)), in some cases accompanied by additional mesophases (CybA or SmC) at lower temperature. The combination of the 3,5-diphenyl-1,2,4-oxadiazole unit with one cyanobiphenyl core leads to the removal of tilted smectic and cybotactic nematic phases (SmC, N(cybC)), which are replaced by the nontilted CybA phases and nematic phases composed of SmA-type clusters (N(cybA)). The orthogonal cybotactic nematic phases of bent-core mesogens are of special interest for achieving biaxial nematic phases of the orthorhombic type. The orthogonal (N(cybA)) and skewed (N(cybC)) cybotactic nematic phases were distinguished by XRD and optical observations.
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Affiliation(s)
- Govindaswamy Shanker
- Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt Mothes Str. 2, D-06120 Halle/Saale, Germany, Tel: ++49 (0) 345 55 25664, Fax: ++49 (0) 345 55 27346
| | - Marko Prehm
- Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt Mothes Str. 2, D-06120 Halle/Saale, Germany, Tel: ++49 (0) 345 55 25664, Fax: ++49 (0) 345 55 27346
| | - Carsten Tschierske
- Institute of Chemistry, Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt Mothes Str. 2, D-06120 Halle/Saale, Germany, Tel: ++49 (0) 345 55 25664, Fax: ++49 (0) 345 55 27346
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Wang Y, Yoon HG, Bisoyi HK, Kumar S, Li Q. Hybrid rod-like and bent-core liquid crystal dimers exhibiting biaxial smectic A and nematic phases. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm34315k] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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