Nanospheres with Tunable Size and Chirality from Helical Polymer鈥揗etal Complexes

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• 作者：F茅lix Freire ; Jos茅 Manuel Seco ; Emilio Qui帽o谩 ; Ricardo Riguera
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：November 28, 2012
• 年：2012
• 卷：134
• 期：47
• 页码：19374-19383
• 全文大小：667K
• 年卷期：v.134,no.47(November 28, 2012)
• ISSN：1520-5126

文摘

A new family of nanospheres is made by complexation of divalent metals (i.e., Ca²⁺, Ba²⁺) and poly(phenylacetylene) polymers bearing 伪-methoxyphenylacetic acid (MPA) pendants with high content of the cis isomer responsible for their helical structures. The resulting helical polymer鈥搈etal complex (HPMC) nanospheres present two interesting properties: (a) their diameter can be tuned to different sizes, to growth or to shrink, by changing the metal ion or the polymer/metal ion ratio, and (b) the helicity on the surface and the interior of the particle can be tuned to any of the two helical senses (M or P) by selection of the metal ion. The role of the solvent, the metal ion, and the helicity of the polymer in the aggregation are discussed. The ability of these nanospheres to encapsulate is demonstrated with examples.