Coordination Reactions and Layer Exchange Processes at a Buried Metal鈥揙rganic Interface

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• 作者：Min Chen ; Michael R枚ckert ; Jie Xiao ; Hans-J枚rg Drescher ; Hans-Peter Steinr眉ck ; Ole Lytken ; J. Michael Gottfried
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 24, 2014
• 年：2014
• 卷：118
• 期：16
• 页码：8501-8507
• 全文大小：292K
• 年卷期：v.118,no.16(April 24, 2014)
• ISSN：1932-7455

文摘

The reactive interface between phthalocyanine (2HPc) and a Cu(111) surface was investigated with X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption/reaction (TPD/TPR). 2HPc reacts with Cu(111) to form copper(II) phthalocyanine (CuPc). For 2HPc submonolayers, the reaction starts already below 240 K. Thin 2HPc multilayers (4 monolayers) are completely converted into CuPc at elevated temperatures (500 K). To understand how molecules can react even though they are initially not in contact with the Cu surface, TPD/TPR studies with a NiPc interlayer between Cu and 2HPc were performed. These studies reveal the operation of an exchange mechanism, by which CuPc or NiPc molecules from the first layer are replaced by 2HPc molecules from higher layers. Once a 2HPc molecule comes into contact with the Cu surface, the molecule can react with the surface, forming CuPc, which can then be replaced by another unreacted 2HPc molecule. These findings have important implications for metal鈥搊rganic interfaces in organic electronic devices, in which the charge carrier injection at the electrodes depends on the electronic properties of the interface.