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2 article(s) from Kaller, Martin

Synthesis and mesomorphic properties of calamitic malonates and cyanoacetates tethered to 4-cyanobiphenyls

Katharina C. Kress,
Martin Kaller,
Kirill V. Axenov,
Stefan Tussetschläger and
Sabine Laschat

Beilstein J. Org. Chem. 2012, 8, 371–378, doi:10.3762/bjoc.8.40

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Scheme 1: Diketonato metallomesogens and diketones with mesomorphic properties.

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Scheme 2: Malonates and cyanoacetates tethered to calamitic 4-cyanobiphenyl units.

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Scheme 3: Synthesis of malonate and cyanoacetates tethered to 4-cyano-biphenyl moieties.

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Figure 1: DSC traces of 13a (heating/cooling rate 5 K/min).

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Figure 2: DSC traces of 11a (heating/cooling rate 10 K/min).

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Figure 3: Schlieren textures of 11a and 11b under crossed polarizers, upon cooling (cooling rate 5 K/min) fro...

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Figure 4: Schlieren textures of 13a and 13b under crossed polarizers upon cooling (cooling rate 5 K/min) from...

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Figure 5: 2D X-ray scattering patterns of 11a: (A) crystalline phase at 50 °C, (B) isotropic phase at 25 °C, ...

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Published 09 Mar 2012

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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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