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Synthesis and gelation capability of Fmoc and Boc mono-substituted cyclo(L-Lys-L-Lys)s

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Abstract

Fmoc or Boc mono-substituted cyclo(L-Lys-L-Lys)s were synthesized via the reaction of lysine cyclic dipeptide with Fmoc N-hydroxysuccinimide este(Fmoc-OSu) and di-tert-butyl dicarbonate[(Boc)2O], respectively. The resulted mono-substituted cyclo(L-Lys-L-Lys)s(2―4) by means of test tube inversion method served as organogelators enabled to form stable thermo-reversible organogels in alcoholic, substituted benzene and chlorinated solvents, with the minimum gelation concentration(MGC) in a range of 1%―4%(mass fraction). The transmission electron microscopy(TEM) and scanning electron microscopy(SEM) observations reveal that these gelators self-assembled into 3D nanofiber, nanoribbon or nanotube network structures. The rheological measurement exhibited that the storage modulus of gels is higher than the loss one, and the complex viscosity is reduced linearly with the increasing of scanning frequency. The fluorescence spectrum of compound 2 in 1,2-dichloroethane and benzene demonstrates that the emission peak of Fmoc at 320 nm has red-shifted and the intensity decreases gradually, while the intensity of the emission peak at 460 nm substantially enhances as a function of concentration, indicating the existence of π-π stacking interactions and the formation of J-type aggregates. Meanwhile, compound 4 self-assembled into nanotubes via the stacking of multiple bilayer membranes. Fmoc and Boc disubstituted cyclo(L-Lys-L-Lys)(3) holds the relatively lower MGC values, showing the stronger gelation ability in most selected organic solvents due to the presence of both Fmoc and Boc groups.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P. R. China

    Qianying Zong, Huimin Geng, Lin Ye, Aiying Zhang, Ziqiang Shao & Zengguo Feng

  2. Beijing Engineering Research Center of Cellulose and Its Derivatives, Beijing, 100081, P. R. China

    Ziqiang Shao

Authors
  1. Qianying Zong
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  2. Huimin Geng
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  3. Lin Ye
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  4. Aiying Zhang
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  5. Ziqiang Shao
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  6. Zengguo Feng
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Correspondence to Zengguo Feng.

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Supported by the National Natural Science Foundation of China(No.21174018).

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Zong, Q., Geng, H., Ye, L. et al. Synthesis and gelation capability of Fmoc and Boc mono-substituted cyclo(L-Lys-L-Lys)s. Chem. Res. Chin. Univ. 32, 484–492 (2016). https://doi.org/10.1007/s40242-016-5471-5

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  • DOI: https://doi.org/10.1007/s40242-016-5471-5

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