A study on the electrochemical oxidation of piperazine and its electrochemical copolymerization with aniline in acidic medium is presented. It was found that the homopolymerization of piperazine cannot be achieved under electrochemical conditions. A combination of electrochemistry, in situ Fourier transform infrared (FTIR), and ex situ X-ray photoelectron spectroscopy (XPS) spectroscopies was used to characterize both the chemical structure and the redox behavior of an electrochemically synthesized piperazine–aniline copolymer. The electrochemical sensing properties of the deposited material were also tested against ascorbic acid and dopamine as redox probes.
A novel Cd(II) coordination polymer [Cd(C 4 H 11 N 2 )(l-Cl) 2 Cl] n ÁnH 2 O with a supramolecular structure has been synthesized by reaction of CdCl 2 2Á5H 2 O with piperazine. The compound was investigated by X-ray diffraction, electrochemistry, and IR spectroscopy. The CdCl 3 (C 4 H 11 N 2 )ÁH 2 O entity in the compound forms a 1D coordination polymer as a result of the bridging function of the chlorine atoms Cd-Cl 2 -Cd. Adjacent 1D coordination polymers are connected by (O,N,C)-H…Cl, (O,N)-H…Cl, and N-H…O hydrogen bonds, generating a three-dimensional supramolecular network. With this atomic arrangement, the complex can form an electroactive film on a platinum electrode by anodic oxidation in acetonitrile solution.
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