Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (8): 900-908.DOI: 10.11944/j.issn.1000-0518.2015.08.140423

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Synthesis of Cyclo(L-Lys-L-Lys)-Based Organogelators and Their Applications for Phase-Selective Gelation and Dye Adsorption

GENG Huimin,ZONG Qianying,YOU Jie,YE Lin,ZHANG Aiying,FENG Zengguo()   

  1. School of Materials, Beijing Institute of Technology, Beijing 100081, China
  • Received:2014-12-12 Accepted:2015-05-05 Published:2015-08-08 Online:2015-08-08
  • Contact: FENG Zengguo
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21174018)

Abstract:

One linear and one macrocyclic tetrapepitides(4 and 5) with Fmoc were synthesized by two ways of Trt protection group cleavage in the preparation of symmetrical tetrapepitides using cysteine-modified cyclo(L-Lys-L-Lys) diketopi-perazines. Both tetrapepitides show excellent capability to gelate a number of organic solvents to give thermo-reversible organogels. The self-assembled fibrillar networks in the organogels were distinctly observed by SEM. Interestingly, two organogelators could selectively gelate common chlorinated organic solvents from their mixture with water, even at a concentration as low as 0.1%(volume fraction). Moreover, the xerogel obtained from the organogel of compound 4 in chloroform can high efficiently adsorb various tested dyes from aqueous solutions due to the larger specific surface area of 3D xerogel network showing a micro- and nano-sized structure and the π-π interaction between dye molecules and Fmoc protection groups. The absorption capacity of the xerogel for those dyes increases with the temperature.

 

Key words: cyclic dipeptide, organogel, phase-selective gelation, dye adsorption

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