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Tailoring Thermotropic Mesophase Morphologies by Molecular Recognition and Fluorophobic Effect

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An alkoxyphenyl-substituted melamine derivative has been investigated in binary mixtures with twochain
and three-chain semiperfluorinated benzoic acids. Equimolar mixtures of the melamine with the
complementary benzoic acids form discrete hydrogen-bonded heterodimers with elongated central core.
The dimeric supermolecules involving two-chain partially fluorinated acids organize to infinite bilayer
ribbons composed of distinct lipophilic, H-bonded polar aromatic and fluorinated regions, respectively.
The two-dimensional lattice symmetry of the ribbon phases, rectangular or oblique, are defined by the
positions of the fluorinated chains at the phenyl ring of the acid component. Heterodimers of the melamine
with a three-chain partially fluorinated benzoic acid display a hexagonal columnar phase consisting of
extended columnar aggregates with circular shape with a distinct lipophilic region in the center surrounded
by side-by-side arranged H-bonded polar rodlike segments and, finally, by a shell of fluorinated fragments.
Additionally, a cubic phase is observed at more elevated temperatures above the Colh phase. Docking of
2 or 3 equiv. of the two-chain benzoic acids to the melamine core leads to the formation of cylindrical
aggregates with a polar hydrogen-bonded aromatic center surrounded by lipophilic alkyl segments and
an outer sphere of fluorinated molecular blocks. The aggregates organize to hexagonal columnar
mesophases.

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Informasi Detail

Judul Seri

Chemistry of Materials

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2009

Deskripsi Fisik

Chem. Mater. 2009, 21, 491–498

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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