Development of hybrid diblock copolypeptide amphiphile/magnetic metal complexes and their spin crossover with lower-critical-solution-temperature(LCST)-type transition

POLYMER

卷:128

Article

Tsubasa, Arie¹  Otsuka, Soichi¹  Maekawa, Takahiro¹  Takano, Ryota¹  Sakurai, Shinichi²  Deming, Timothy J.³  Kuroiwa, Keita¹ 

[1] Sojo Univ, Fac Engn, Dept Nanosci, Nishi Ku, 4-22-1 Ikeda, Kumamoto 8600082, Japan

[2] Kyoto Inst Technol, Dept Biobased Mat Sci, Sakyo Ku, Kyoto 6068585, Japan

[3] Univ Calif Los Angeles, Dept Bioengn, Los Angeles, CA 90095 USA

关键词: Diblock copolypeptide amphiphiles;    Magnetic metal complexes;    Spin crossover;    Lower critical solution temperature;    Nanoarchitecture;    Self-assembly;   

DOI  :  10.1016/j.polymer.2016.12.079

来源: Elsevier

【 摘 要 】

Diblock copolypeptide amphiphiles have been attracting much interest as motifs for self-assembly in the production of nanostructures such as nanoparticles, nanosheets, and nanofibers. In this study, we first focus on the self-assembly of magnetic metal complexes in water using diblock copolypeptides. In addition, not only were nanocomposites formed, but also observed were the development of lower critical solution temperature (LCST) and LCST-induced spin crossover phenomenon, which are discussed. Three composites composed of the iron complex [ Fe-II(ppi)(2)(NCS)(2)] (ppi = N-phenyl-2-pyridinalimine) and the diblock copolypeptide amphiphiles 1 and 2 or the polypeptide 3 (containing glutamic acid and leucine) were prepared. Supramolecular structures such as sheets and rectangular morphologies were obtained from composites. A perfectly reversible spin crossover with LCST was successfully generated in the case of composites made with 1. The technique of combining polypeptide molecules and discrete coordination compounds thus makes it possible to design flexible, reversible, and spin-controllable metastable systems. (C) 2017 Elsevier Ltd. All rights reserved.

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