title: Formation of C═C bond via knoevenagel reaction between aromatic aldehyde and barbituric acid at liquid/HOPG and vapor/HOPG interfaces.
abstract: Controlling chemical reactions on surface is of great importance to constructing self-assembled covalent nanostructures. Herein, Knoevenagel reaction between aromatic aldehyde compound 2,5-di(5-aldehyde-2-thienyl)-1,4-dioctyloxybenzene (PT2) and barbituric acid (BA) has been successfully performed for the first time at liquid/HOPG interface and vapor/HOPG interface. The resulting surface nanostructures and the formation of C═C bond are recorded through scanning tunneling microscopy (STM), and confirmed by attenuated total reflectance Fourier-transform infrared (ATR/FT-IR) spectrometer and UV-vis absorption. The obtained results reveal that Knoevenagel condensation reaction can efficiently occur at both interfaces. This surface reaction would be an important step toward further reaction to produce innovative conjugated nanomaterial on the surface.
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology , No. 11 Beiyitiao, Zhongguancun, Beijing 100190, P. R. China.
authors: Yanfang
authors: Y
authors: Geng
authors: Hongliang
authors: H
authors: Dai
authors: Shaoqing
authors: S
authors: Chang
authors: Fangyun
authors: F
authors: Hu
authors: Qingdao
authors: Q
authors: Zeng
authors: Chen
authors: C
authors: Wang
keywords: C═C bond; Knoevenagel reaction; interface