Electropolymerized-self-assembly Films Of Thiophene Palladium(â…¡) Complexes: Studies On Heterogeneous Catalysis

In this paper, self-assembled monolayer films and electrochemical polymerization films of cyclopalladated thiophene imine complexes were prepared by using self-assembly and electrochemical polymerization. Taken Suzuki-Miyaura reaction as a template, their different catalytic properties and catalytic mechanism of Suzuki-Miyaura coupling reaction were carried by effective means of scientific research. The main contents are as follows:1. Self-assembled monolayer films Si-Cat of cyclopalladated thiophene imine complexes (Scheme 1) were successfully prepared by grafting from the surface of substrate, which was characterized by WCA, AFM, UV-vis, Rs, XPS and RIS. Taken Suzuki-Miyaura reaction as a template, Self-assembled monolayer films Si-Cat of cyclopalladated thiophene imine complexes of catalytic properties were investigated. In relatively mild reaction conditions of Suzuki-Miyaura coupling reaction, a self-assembled film Si-Cat catalyst not only have strong catalytic activity, high substrate suitability, but also have good recyclity and stability.2. Electropolymerized films of thiophene palladium (â…¡) complexes (Scheme 2) were successfully prepared by self-assembly technology combined with electrochemical polymerization technique. Compared to self-assembled monolayer films Si-Cat, Electropolymerized films of ITO-Cat.2b was reused six times, without losing of significant catalytic activity. However, electropolymerized films of ITO-Cat.2c were reused seven times, without losing of significant catalytic activity. This is because new micro phenomenon of electropolymerized films of ITO-Cat.2b and ITO-Cat.2c may improve the controllability self-assembled organic molecular catalyst, thereby increasing the activity and recyclability of the catalyst.