期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 19, 页码 6008-6014出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201103814
关键词
birefringence; dyes; pigments; hydrogels; nucleosides; self-assembly
资金
- CSIR [01(2371)10/EMR-II]
- DBT, India [BT/PR14698/BRB/10/867/2010]
- CSIR, India
- UGC, India
Transparent self-standing supramolecular hydrogels were readily prepared by the potassium-ion-mediated self-organization of guanosine and 8-bromoguanosine whilst the individual components precipitated within a few hours. VT-NMR spectroscopy showed that bromoguanosine was a superior gelator compared to guanosine. XRD analysis showed that gel formation was caused by stacked G-quartets. AFM analysis revealed dendritic architectures of the nanofibers in the two-component hydrogel network. DSC profiles showed that the hybrid hydrogels underwent solgel transition at lower temperature than the pure guanosine and bromoguanosine hydrogels. Interestingly, bioactive dyes, such as rose bengal, rhodamine-6-G, and fluorescein, could be diffused and released in a controlled manner. UV/Vis absorption and fluorescence spectroscopy and CLSM were used to investigate the diffusion behavior of dyes in the hydrogel network. These dyes exhibited strong birefringence in the gel network (0.070.1) as a result of the anisotropic organization.
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