Self-Assembled Molecular Architectures on Surfaces: New Strategies Involving Metal-Organic Copolymers

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• 作者：David M. Sarno ; Biwang Jiang ; David Grosfeld ; Jesse O. Afriyie ; Luis J. Matienzo ; and Wayne E. Jones ; Jr.
• 刊名：Langmuir
• 出版年：2000
• 出版时间：July 25, 2000
• 年：2000
• 卷：16
• 期：15
• 页码：6191 - 6199
• 全文大小：213K
• 年卷期：v.16,no.15(July 25, 2000)
• ISSN：1520-5827

文摘

A combination of oligomeric porphyrin copolymers and bidentate Lewis bases has been used to construct2-dimensional multilayer molecular architectures on siloxane-derivatized glass substrates. The key to thissupramolecular chemistry is coordinate covalent bonding between zinc-metalated porphyrins and bipyridyl"spacer" ligands, generating layers in an alternating, iterative fashion. UV-vis, XPS, AFM, and X-raydiffraction data support the formation of ordered thin film arrays. The stepwise deposition of each porphyrinlayer is tracked by the linear increase in the absorbance of the porphyrin Soret band. XPS results demonstratethat the pyridinium coupling in the first monolayer is susceptible to X-ray decomposition during prolongedexposure. Extremely weak emission in the 600-800 nm region is attributed to the low chromophoreconcentration in the multilayer films. These results contrast sharply with those of spin-coated polymerthin films and represent an encouraging first step toward the design of new multilayer architectures.