An analytical method for detecting toxic metal cations using cyclotriveratrylene derivative capped gold nanoparticles

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• 作者：Zachary R. Osner^a ; Richard C. Holz^b ; Daniel P. Becker^a ; ^{dbecke3@luc.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gold nanoparticles ; Supramolecular chemistry ; Heavy metal detection ; Lanthanides ; Cyclotriveratrylene
• 刊名：Tetrahedron Letters
• 出版年：2015
• 出版时间：30 September 2015
• 年：2015
• 卷：56
• 期：40
• 页码：5419-5423
• 全文大小：1165 K

文摘

Cyclotriveratrylene-oxime (CTV-oxime) derivatives that terminate with a dithiolate linker were synthesized enabling the supramolecular scaffold to adhere to gold nanoparticles (AuNPs) with the bowl-shaped cavity of the CTV scaffold exposed for utilization in host–guest chemistry. Exposure of these CTV functionalized AuNPs to varying concentrations of di- and trivalent metal cations resulted in the formation of large CTV-AuNP polymeric clusters and an accompanying a shift in the plasmon resonance. These interactions between the CTV-AuNPs and the metal cations in solution provides proof-of-concept that supramolecular functionalized AuNPs can be used as a simple and straightforward, on-site detection system for toxic metal cations in solution. The order of binding affinity of the metals studied based on observed K_d values is Cu²⁺ > Zn²⁺ > Pb²⁺ > Hg²⁺ > Eu³⁺ > Cd²⁺.