title: STM study on quinacridone derivative assemblies: modulation of the two-dimensional structure by coadsorption with dicarboxylic acids.
abstract: We describe the two-dimensional (2D) assemblies of N,N'-dialkyl-substituted quinacridone derivatives on highly orientated pyrolytic graphite observed by scanning tunneling microscopy, and focus our discussion on whether the supramolecular organization can be modulated by the coadsorption of dicarboxylic acids. Our experiments have demonstrated that the quinacridone derivatives can form different 2D nanostructures when coadsorbed with dicarboxylic acids of different length at the liquid/graphite interface. Interestingly, N,N'-dihexadecyl-substituted quinacridone derivative alternately takes two different conformations in two columns for its coadsorption with pentadecanedioic acid and form a gridlike structure. It is shown that a cooperative effect of different interactions can be modulated by introducing guest molecule, leading to formation of different self-assembled nanostructures.
authors.affiliation: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Xunyu
authors.initials: X
authors.lastname: Yang
authors.forename: Zhongcheng
authors.initials: Z
authors.lastname: Mu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Wang
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang