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5 article(s) from Giesselmann, Frank

Thermotropic and lyotropic behaviour of new liquid-crystalline materials with different hydrophilic groups: synthesis and mesomorphic properties

Alexej Bubnov,
Miroslav Kašpar,
Věra Hamplová,
Ute Dawin and
Frank Giesselmann

Beilstein J. Org. Chem. 2013, 9, 425–436, doi:10.3762/bjoc.9.45

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Figure 1: Microphotographs of the textures obtained in the polarized optical microscope on planar samples (PS...

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Figure 2: DSC plot on heating/cooling runs (indicated by horizontal arrows) for indicated nonchiral compounds...

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Figure 3: DSC plot on heating/cooling runs (indicated by horizontal arrows) for indicated chiral compounds: T...

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Figure 4: Temperature dependence of the layer spacing d, and intensity of the scattered X-ray beam measured a...

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Figure 5: Schematic contact preparation used for detection and study of lyotropic behaviour.

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Figure 6: Microphotographs of the contact preparation of TL4 with diethylene glycol (DG): (a) texture of the ...

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Scheme 1: General procedure for the synthesis of (a) nonchiral 4'-(2,5,8,11-tetraoxatridecan-13-yloxy)bipheny...

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Scheme 2: General procedure for synthesis of 2-(1-(6-(4'-(6-(3-hydroxy-2-(hydroxymethyl)-2-methylpropoxy)hexy...

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Scheme 3: General procedure for the synthesis of chiral (E)-2-methyl-2-((2-(2-(2-(4-((4-((4-(2-methylbutoxy)p...

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Full Research Paper

Published 25 Feb 2013

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Formation of smectic phases in binary liquid crystal mixtures with a huge length ratio

Nadia Kapernaum,
Friederike Knecht,
C. Scott Hartley,
Jeffrey C. Roberts,
Robert P. Lemieux and
Frank Giesselmann

Beilstein J. Org. Chem. 2012, 8, 1118–1125, doi:10.3762/bjoc.8.124

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Figure 1: Smectic A phase of a mixture of two mesogens differing strongly in molecular length. Left: The laye...

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Scheme 1: Chemical structures and phase-transition temperatures of the mesogens 2PhP and PhP16 and of the chi...

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Figure 2: Molecular structures and molecular lengths of 2PhP and PhP16. The longer mesogen PhP16 is approxima...

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Figure 3: The phase diagram of the binary mixture system PhP16/2PhP.

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Figure 4: The layer spacing obtained by SAXS-measurements in the SmA phase at T = T_c is plotted against the m...

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Figure 5: Reduced layer spacing d/d_A versus temperature difference to the phase-transition temperature T−T_c f...

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Figure 6: The tilt angle θ is plotted against the temperature difference to the phase-transition temperature T...

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Figure 7: Translational order parameter Σ in the SmA phase versus temperature difference to the phase-transit...

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Figure 8: Textures of the pure compound PhP16 on cooling. Left: SmC phase at 96.8 °C Right: same positions in...

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Figure 9: Integrated intensity profile of an unoriented sample of PhP16 at T = 82.5 °C in the SmF phase.

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Figure 10: (a) WAXS-measurement of the SmF phase of PhP16 at T = 82 °C with the smectic-layer normal k oriente...

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Figure 11: (a) WAXS-measurement of the SmF phase of PhP16 at T = 88 °C with the smectic layer normal oriented ...

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Figure 12: (a) Layer spacing of the SmF and the SmC phase of the pure compound PhP16 in dependence of the temp...

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Published 19 Jul 2012

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Molecular length distribution and the formation of smectic phases

Nadia Kapernaum,
C. Scott Hartley,
Jeffrey C. Roberts,
Robert P. Lemieux and
Frank Giesselmann

Beilstein J. Org. Chem. 2009, 5, No. 65, doi:10.3762/bjoc.5.65

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Figure 1: Structure of different liquid crystalline phases build with two kinds of hard spherocylinders with ...

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Scheme 1: Chemical formulas and phase sequences of the mesogens PhP14, 6PhPz and 2PhP and the chiral dopant M...

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Figure 2: Molecular structure of the mesogens PhP14, 6PhPz and 2PhP differing in molecular lengths by a facto...

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Figure 3: Phase diagram of the system 2PhP/PhP14. Over a broad temperature and concentration range only the S...

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Figure 4: The layer spacing in the SmA phase at T = T_c vs mole fraction for the system 2PhP/PhP14 (filled tri...

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Figure 5: Reduced layer spacing for the mixtures which exhibit SmA and SmC phases in the system 2PhP/PhP14. P...

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Figure 6: Textures of the mixture with 65% PhP14 in 2PhP as observed in the polarizing microscope. The upper ...

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Figure 7: Tilt angle vs temperature difference to the phase transition temperature for pure PhP14 (filled tri...

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Figure 8: The translational order parameter Σ in the SmA phase is plotted vs the reduced temperature 1 – T/T_c...

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Figure 9: Phase diagram of the system 6PhPz/PhP14. Over a broad temperature region only the SmA phase is stab...

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Figure 10: Reduced layer spacing vs temperature difference to the phase transition temperature for the mixture...

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Figure 11: Schematic sketches of different models for smectic A ordering of bidisperse mesogens. Different mod...

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Full Research Paper

Published 13 Nov 2009

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Influence of spacer chain lengths and polar terminal groups on the mesomorphic properties of tethered 5-phenylpyrimidines

Gundula F. Starkulla,
Elisabeth Kapatsina,
Angelika Baro,
Frank Giesselmann,
Stefan Tussetschläger,
Martin Kaller and
Sabine Laschat

Beilstein J. Org. Chem. 2009, 5, No. 63, doi:10.3762/bjoc.5.63

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Scheme 1: Comparison of mesomorphic properties of 1a and 2a.

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Scheme 2: Variation of spacer lengths and terminal group at 5-phenylpyrimidine.

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Scheme 3: Synthesis of compounds 3–5, 9 and 11.

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Scheme 4: Synthesis of compounds 6 and 7.

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Figure 1: DSC curve of compound 3d (heating/cooling rate 10 K/min).

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Figure 2: Fan-shaped texture of 3e under crossed polarizers upon cooling from the isotropic liquid (magnifica...

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Figure 3: DSC curve of compound 4e (heating/cooling rate 5 K/min).

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Figure 4: Fan-shaped texture of compound 4d at 45 °C upon cooling from the isotropic liquid (cooling rate 1 K...

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Figure 5: DSC curve of compound 6c (heating/cooling rate 10 K/min).

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Figure 6: Fan-shaped texture of compound 6e at 45 °C upon cooling from the isotropic liquid (cooling rate 10 ...

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Figure 7: Comparison of the mesophase range ΔT for the different spacer lengths of compounds 3, 4 and 6: meso...

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Figure 8: Comparison of the mesophase range ΔT for the different spacer lengths of compounds 3, 4 and 6: meso...

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Figure 9: Proposed model for the layer structure.

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Published 09 Nov 2009

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Saddle-shaped tetraphenylenes with peripheral gallic esters displaying columnar mesophases

Eugen Wuckert,
Constanze Hägele,
Frank Giesselmann,
Angelika Baro and
Sabine Laschat

Beilstein J. Org. Chem. 2009, 5, No. 57, doi:10.3762/bjoc.5.57

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Scheme 1: Synthesis of tetraphenylenes 2.

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Figure 1: DSC traces of compound 2h during (a) second cooling and (b) second heating (heating/cooling rate 5 ...

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Figure 2: Texture of 2h under the POM at 25 °C upon cooling from the isotropic liquid (heating/cooling rate 5...

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Figure 3: Molecular modelling of the saddle-shaped tetraphenylene (octakis)acyl core unit of 2 [35].

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Figure 4: Clearing temperatures T_cl [°C] of tetraphenylenes 2e–l as a function of the chain lengths n.

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Figure 5: The differences between the clearing temperatures T_cl [°C] of tetraphenylenes 2 and the melting poi...

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Published 21 Oct 2009

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