Synthesis,structures, electrochemistry and catalytic activities of copper(II) and palladium(II) complexes with asymmetric tetraazacycloannulenes |
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Authors: | EH Kim DI Kim HS Lee HG Na JC Byun JH Choi YC Park |
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Institution: | 1. Department of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea;2. Department of Chemistry, Daejin University, Pochon 487-800, Republic of Korea;3. Department of Chemistry, Cheju National University, Cheju 690-756, Republic of Korea;4. Department of Chemistry, Andong National University, Andong 760-749, Republic of Korea |
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Abstract: | Copper(II) and palladium(II) complexes with 15-membered asymmetric 5,9-dihydro-2,4,10,12-tetramethyl-1,5,9,13-monobenzotetraazacyclo15]tetradecine have been synthesized and characterized. The electrochemical behaviors of the complexes showed a reduction and two one-electron irreversible oxidation waves in given potential ranges due to the metal ion and macrocycle ring, respectively. The electrocatalytic reduction of dioxygen on glassy carbon electrodes electropolymerized by such 15-membered and 14-membered tetraazaannulene complexes occurred at 160–280 mV (versus SCE), less negative than on the bared one at pH 7.0. The catalytic activities of the copper(II) complexes in the oxidation of p-Xstyrene (X = OCH3, CH3, H, F, Cl) were higher than those of the palladium(II) ones. The structures of the 15-membered copper(II) and palladium(II) complexes were determined using the X-ray diffraction method. |
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Keywords: | Cu(II)- and Pd(II)-tetraazacycloannulene Structure Spectral and electrochemical properties Electrocatalytic reduction |
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