Polymorphism of Amino Acid‐Based Dendrons: From Organogels to Microcrystals |
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| Authors: | Dr Gui‐Chao Kuang Ming‐Jun Teng Prof Xin‐Ru Jia Prof?Dr Er‐Qiang Chen Prof?Dr Yen Wei |
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| Institution: | 1. Beijing National Laboratory for Molecular Sciences and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 (China), Fax: (+86)?10‐6275‐1708;2. Department of Chemistry, Tsinghua University, Beijing, 100084 (China) |
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| Abstract: | There is a delicate balance for a low‐weight molecule to behave as a gelator or crystal. The synthesis of two novel amino acid‐based naphthalene‐dendrons, Nap ‐ G1 and Nap ‐ G2 is described. Both dendrons display polymorphic properties in organic solvents. Nap ‐ G1 developed a fibrous network with β‐sheet architecture in cyclohexane but exhibited a spherulitic network in mixed solvents (chloroform/petroleum ether 1:5, v/v). On the other hand, Nap ‐ G2 acted as an efficient organogelator in chloroform but formed crystalline fibers in relatively high polarity solvents (such as acetone and methanol). Combinations of characterizations have been employed to study the polymorphism. |
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| Keywords: | amino acids β sheets dendrons polymorphism self‐assembly |
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