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2 article(s) from Vollmeyer, Joscha

Self-assembled monolayers of shape-persistent macrocycles on graphite: interior design and conformational polymorphism

Joscha Vollmeyer,
Friederike Eberhagen,
Sigurd Höger and
Stefan-S. Jester

Beilstein J. Org. Chem. 2014, 10, 2774–2782, doi:10.3762/bjoc.10.294

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Figure 1: (a), (b) Two distinguishable packings of alkyl chains on cutouts of graphite are shown with the car...

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Figure 2: (a)–(c) Schematic structure of a hexagonal shape-persistent macrocycle with extraannular alkoxy cha...

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Figure 3: (a)–(c) Shape-persistent macrocycles with an empty cavity (1), an apolar interior (undecyl diether ...

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Figure 4: Scanning tunneling microscopy images and supramolecular models of (a)–(c) porous (= polymorph A) an...

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Figure 5: (a)–(e): Schematic structure of the shape-persistent macrocycle 1 (as a representative of the serie...

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Published 26 Nov 2014

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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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