Di Giannantonio Michela, Ayer Mathieu A, Verde-Sesto Ester, Lattuada Marco, Weder Christoph, Fromm Katharina M
Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland.
Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700, Fribourg, Switzerland.
Angew Chem Int Ed Engl. 2018 Aug 27;57(35):11445-11450. doi: 10.1002/anie.201803524. Epub 2018 Jul 26.
The introduction of mechanophores into polymers makes it possible to transduce mechanical forces into chemical reactions that can be used to impart functions such as self-healing, catalytic activity, and mechanochromic response. Here, an example of mechanically induced metal ion release from a polymer is reported. Ferrocene (Fc) was incorporated as an iron ion releasing mechanophore into poly(methyl acrylate)s (PMAs) and polyurethanes (PUs). Sonication triggered the preferential cleavage of the polymers at the Fc units over other bonds, as shown by a kinetic study of the molar mass distribution of the cleaved Fc-containing and Fc-free reference polymers. The released and oxidized iron ions can be detected with KSCN to generate the red-colored [Fe(SCN) (H O) )] complex or reacted with K [Fe(CN) ] to afford Prussian blue.
将机械响应基团引入聚合物中，使得将机械力转化为化学反应成为可能，这些化学反应可用于赋予聚合物诸如自愈、催化活性和机械变色响应等功能。在此，报道了一个聚合物中机械诱导金属离子释放的例子。二茂铁（Fc）作为一种释放铁离子的机械响应基团被引入到聚丙烯酸甲酯（PMA）和聚氨酯（PU）中。动力学研究表明，超声处理会优先使聚合物在Fc单元处而非其他键处发生断裂，这通过对裂解后的含Fc和不含Fc的参比聚合物摩尔质量分布的研究得以证明。释放并氧化后的铁离子可用硫氰酸钾（KSCN）检测，生成红色的[Fe(SCN)(H₂O)₅]络合物，或与铁氰化钾（K₃[Fe(CN)₆]）反应生成普鲁士蓝。
