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3 article(s) from Baumeister, Ute

The influence of intraannular templates on the liquid crystallinity of shape-persistent macrocycles

Joscha Vollmeyer,
Ute Baumeister and
Sigurd Höger

Beilstein J. Org. Chem. 2014, 10, 910–920, doi:10.3762/bjoc.10.89

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Figure 1: Shape-persistent macrocycles with different peripheral side groups and intraannular templates.

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Scheme 1: Synthesis of macrocycle 1a with an intraannular undecanedioxy bridge. a: Pd(PPh₃)₂Cl₂, PPh₃, CuI, p...

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Figure 2: GPC elugrams of the crude product of the cyclization reaction of 1a (—) and 1d (- - -), respectivel...

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Scheme 2: Synthesis of the template free macrocycle 1d. a: Pd(PPh₃)₂Cl₂, PPh₃, CuI, piperidine, 98%; b: TBAF,...

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Figure 3: (a) Melting points (T_m) and clearing points (T_cl) of macrocycles with different interior. ^[a]First ...

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Figure 4: POM images of (a) 1a (20×, 133 °C, upon cooling); (b) 1d (20×, 84 °C, upon heating).

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Figure 5: 2D X-ray patterns for 1d: (a) isotropic liquid at 160 °C, (b) partially aligned liquid crystalline ...

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Figure 6: 2D X-ray patterns for 1a: (a) isotropic liquid at 150 °C, (b) columnar mesophase at 100 °C, surface...

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Figure 7: Model of the molecular packing in the columnar mesophase of 1a: (a) 2D packing scheme for the colum...

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Published 23 Apr 2014

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Laterally substituted symmetric and nonsymmetric salicylideneimine-based bent-core mesogens

Sonja Findeisen-Tandel,
Wolfgang Weissflog,
Ute Baumeister,
Gerhard Pelzl,
H. N. Shreenivasa Murthy and
Channabasaveshwar V. Yelamaggad

Beilstein J. Org. Chem. 2012, 8, 129–154, doi:10.3762/bjoc.8.15

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Scheme 1: Examples for bent mesogens containing salicylideneimine moieties.

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Scheme 2: Synthetic pathway to prepare compounds OH 1.

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Figure 1: Polarising optical microscopy images. a) Compound OH 1a: Grainy texture with smectic Schlieren area...

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Figure 2: X-ray diffraction pattern of a powderlike sample of OH 1b at 131 °C (inset: Small angle region; low...

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Figure 3: Electro-optical behaviour of compound OH 1a: a) current response curve (U = 182 V_pp, f = 30 Hz, T =...

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Figure 4: Switching behaviour of compound H 1a, which depends on how quickly the electric field is switched o...

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Scheme 3: Reaction pathways to prepare the monosalicylideneaniline compounds OH 2a–j.

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Figure 5: Compound OH 2a: Texture of the SmCP phase at 126 °C.

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Figure 6: a) 2D X-ray pattern of a surface-aligned sample of compound OH 2a at 128 °C (lower part of the patt...

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Figure 7: Electro-optical switching behaviour of compound OH 2a: a) current response (U = 230 V_pp, f = 25 Hz, ...

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Scheme 4: Synthetic steps followed to prepare the compounds OH 3 and OH 4.

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Figure 8: Optical photomicrographs of compound OH 3a: a) On cooling of the isotropic liquid; c) U = 0 V; b) U...

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Figure 9: Electro-optical behaviour of compound OH 3a: a) Current response curve (U = 308 V_pp, f = 35 Hz, T =...

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Figure 10: Growth of a fan-shaped texture from lancetlike filaments upon cooling of the isotropic liquid of co...

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Figure 11: a) 2D X-ray pattern of a surface-aligned sample of compound OH 3b at 160 °C (lower part of the patt...

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Figure 12: Compound OH 3b: Texture of the SmCP_A phase in dependence on the polarity of the applied D.C. field.

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Figure 13: Compound OH 4b, exhibiting a fan-shaped texture together with a Schlieren texture upon cooling of t...

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Figure 14: 2D X-ray diffraction pattern of a partially surface-aligned sample of OH 4b at 115 °C (inset: Small...

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Figure 15: Switching behaviour of compound OH 4b at 120 °C: a) Current response curve (U = 116 V_pp, f = 40 Hz, ...

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Figure 16: Compound OH 4d: a) Microphotograph of a growing fringe pattern of a SmCP phase upon cooling of the ...

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Figure 17: Electro-optical behaviour observed on the fan-shaped texture of compound OH 4d; U_D.C. = 47 V; T = 1...

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Figure 18: a) 2D X-ray diffraction pattern for a surface-aligned sample of OH 4d at 122 °C on cooling; b) χ-sc...

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Scheme 5: Reaction steps employed for the preparation of the compounds OH 5 and OH 6.

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Figure 19: Compound OH 5d: Optical photomicrographs of chiral domains at 122 °C; polariser and analyser are un...

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Figure 20: Compound OH 5b: a), b) Chiral domains at 175 °C, 0 V, polarisers uncrossed by about ±8° from the 90...

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Figure 21: X-ray diffraction patterns of compounds OH 5: a) Pattern of a powderlike sample of compound OH 5g a...

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Figure 22: Photomicrographs of compound OH 5f: a) Appearance of spiral filaments on slow cooling of the isotro...

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Figure 23: Current response of compound OH 6b exhibiting two repolarisation peaks proving an antiferroelectric...

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Figure 24: On cooling the isotropic liquid phase of compound OH 6c; a Schlieren texture together with fringe p...

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Figure 25: Electro-optical behaviour of compound OH 6c: a) Current response (U_A.C. = 17 V/µm, f = 39 Hz, T = 1...

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Published 24 Jan 2012

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Coaxial electrospinning of liquid crystal-containing poly(vinylpyrrolidone) microfibres

Eva Enz,
Ute Baumeister and
Jan Lagerwall

Beilstein J. Org. Chem. 2009, 5, No. 58, doi:10.3762/bjoc.5.58

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Figure 1: Schematic illustration of the main parts of the setup used in our lab for coaxial electrospinning a...

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Figure 2: Polarizing optical microscopy photographs of 8CB-containing composite fibres; (a) SmA phase at room...

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Figure 3: Microscopy photographs of characteristic samples when varying the flow rate of the liquid crystal [Graphic 1] _in...

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Figure 4: Outer fibre diameters as a function of LC flow rate as determined from 50 measurements by optical m...

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Figure 5: DSC thermograms on heating of 8CB as bulk and as inclusion compound in PVP fibres produced with dif...

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Figure 6: The liquid crystal core shows a transformation from bubbly to smooth and to bubbly again with incre...

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Figure 7: Influence of the applied voltage and the flow rate of the polymer solution on the mean fibre diamet...

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Figure 8: a), b): 2D X-ray diffraction pattern of oriented fibres at two perpendicular roll-up directions sch...

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Figure 9: X-ray diffraction patterns of PVP fibres without LC (a) and of surface-aligned samples of bulk 8CB ...

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Figure 10: Schematic sketch of the arrangement of LC molecules and the smectic layers in an electrospun fibre.

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Published 23 Oct 2009

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