Supramolecular Synthons on Surfaces: Controlling Dimensionality and Periodicity of Tetraarylporphyrin Assemblies by the Interplay of Cyano and Alkoxy Substituents
作者:Nikolai Wintjes、Jens Hornung、Jorge Lobo‐Checa、Tobias Voigt、Tomáš Samuely、Carlo Thilgen、Meike Stöhr、François Diederich、Thomas A. Jung
DOI:10.1002/chem.200800746
日期:2008.6.27
pore-to-pore distances for the three networks depend on the size and shape of the alkoxy substituents. All observed effects are explained by 1) different steric demands of the alkoxy residues, 2) apolar (mainly dispersion) interactions between the alkoxy chains, 3) polar bonding involving both cyanophenyl and alkoxyphenyl substituents, and 4) the entropy/enthalpy balance of the network formation.
通过扫描隧道显微镜(STM)在Cu(111)基板上详细研究了三种卟啉衍生物的自组装。所有衍生物在卟啉核的对角相对的介位上具有两个4-氰基苯基取代基,但是其他两个介观烷氧基苯基取代基的性质不同。在覆盖率低于0.8单层时,两个衍生物形成分子链,并在覆盖率更高时演变为纳米孔网络。三阶导数直接自组装成纳米多孔网络,而没有显示一维相。这三个网络的孔至孔距离取决于烷氧基取代基的大小和形状。所有观察到的影响都可以通过1)烷氧基残基的不同空间要求,2)烷氧基链之间的非极性(主要是分散)相互作用来解释,