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Formation of double helix self-assembled monolayers of ethynylhelicene oligomer disulfides on gold surfaces |
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| Authors: | Koji YamamotoHiroki Sugiura Ryo AmemiyaHaruo Aikawa Zengjian AnMasahiko Yamaguchi Masashi Mizukami Kazue Kurihara |
| Institution: | a Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Sendai 980-8578, Japan b International Advanced Research and Education Organization, Tohoku University, Aoba 6-3, Sendai 980-8577, Japan c WPI Advanced Institute for Materials Research, Tohoku University, Aoba 6-3, Sendai 980-8577, Japan d Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan |
| Abstract: | Optically active ethynylhelicene pentamers and hexamers linked by disulfide bonds were synthesized. They formed self-assembled monolayers (SAMs) with double helix structure on gold surfaces, which were analyzed by infrared reflection-absorption spectroscopy (IR-RAS), quartz crystal microbalance (QCM), surface plasmon resonance (SPR), and circular dichroism (CD). Double helix SAMs could be formed on gold surfaces either from double helices or random coils in solution. The double helices on the surface were more stable than in solution. This result suggested the presence of strong intercomplex interactions between double helix complexes on the surface. |
| Keywords: | Ethynylhelicene oligomer Double helix Self-assembled monolayer Thermal stability Intercomplex interaction |
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