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Supramolecular Self-Assembly of Dimeric Dendrons with Different Aliphatic Spacers

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A series of low-molecular-mass organogelators (LMOGs), dimeric dendrons based on natural amino
acids, glycine. and aspartic acid, with different aliphatic spacers have been synthesized and their selfassembly behavior and structure-property relationship have been studied. Transmission electron
microscopy (TEM), atomic force microscopy (AFM), infrared spectroscopy (IR), and small-angle X-ray
scattering (SAXS) were employed to characterize the self-assembled structures and to examine the effect
of the length of aliphatic spacers on the gelation. It was found that all of the gels were thermoreversible
and stable for more than half a year at room temperature. The dimeric dendrons with longer aliphatic
spacers displayed enhanced gelation ability. The SAXS patterns of the xerogels G2SnG2 (n = 6, 8, and
10) showed periodical reflections that could be attributed to the formation of a hexagonal columnar phase,
whereas G2S15G2 formed a lamellar structure. Hydrogen bonding and π-π stacking interactions were
evidenced by IR and fluorescence spectroscopy with pyrene as a probe, respectively. Moreover, the
compounds G2SnG2 not only acted as efficient organogelators but also self-organized into thermotropic
liquid crystal, with the mesophase formation being correlated to the spacer length.

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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, 456–462

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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