Metal Ion Coordination with an Asymmetric Fan-Shaped Dendrimer at the Air鈥揥ater Interface

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• 作者：Jeongyoon Yang ; Songyi Lee ; Hoik Lee ; Jisun Lee ; Hwan Kyu Kim ; Sang Uck Lee ; Daewon Sohn
• 刊名：Langmuir
• 出版年：2011
• 出版时间：July 19, 2011
• 年：2011
• 卷：27
• 期：14
• 页码：8898-8904
• 全文大小：1203K
• 年卷期：v.27,no.14(July 19, 2011)
• ISSN：1520-5827

文摘

Metal coordination to monolayers of 4-{10-[4-(3,5-bis-benzyloxy)-phenyl]-anthracen-9-yl}-benzoic acid ([G1-An]-CO₂H, G1) and 4-(10-{4-[3,5-bis-(3,5-bis-benzyloxy)-benzyloxy]-phenyl}-anthracen-9-yl)-benzoic acid ([G2-An]-CO₂H, G2) at the air鈥搘ater interface and to Langmuir鈥揃lodgett (LB) films was investigated using surface pressure鈥揳rea isotherms, ultraviolet鈥搗isible (UV鈥搗is) spectroscopy, atomic force microscopy (AFM), and X-ray reflectivity (XRR). Surface pressure鈥揳rea isotherms show that G1 and G2 have different limiting areas according to the type of subphase. The limiting area of G1 and G2 increased more with Al³⁺ than with Eu³⁺ in the subphase. This result indicates that the hydrophilic core group is anchored to ions in the water via bidentate chelates with the carboxylate oxygen atoms of G1 and G2. Circular domains and aggregates were observed for the LB film. The different behavior of Eu³⁺ and Al³⁺ complexes is originated from the intrinsic nature of the ion, i.e., coordination number.