Electrochemical response of ferrocenium filled calix[4]arene capsules in solution and immobilized on gold

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• 作者：Songbo Xu ; Ganna Podoprygorina ; Chulsoon Moon ; Volker Bö ; hmer ; Zhifeng Ding ; Silvia Mittler
• 关键词：Calix[4]arene heterodimers ; Encapsulation ; Ferrocenium ; Cyclovoltammetry ; Self-assembled monolayers
• 刊名：Electrochimica Acta
• 出版年：2008
• 出版时间：15 November 2008
• 年：2008
• 卷：53
• 期：27
• 页码：7981-7987
• 全文大小：359 K

文摘

Hydrogen-bonded dimers of tetra-urea calix[4]arenes are able to include ferrocenium ions as a guest. Heterodimeric capsules are exclusively formed in 1:1 mixtures of tetra-arylurea calix[4]arene 1 with tetra-tosylurea calix[4]arene 2. Sulfide groups attached via spacers on the urea rim of 1 allow their binding to metal surfaces rendering simultaneously their dissociation more difficult. Thus, the electrochemical response of encapsulated ferrocenium could be studied in a self-assembled monolayer (SAM) in addition to the solution electrochemistry with cyclic voltammetry. The stability of the electrochemically active monolayers was tested after a heat treatment (225 °C for 30 min in N₂ atmosphere) and multiple cycling (up to 1200 cycles), which could be required for a possible application as molecular based information storage.