Synthesis of a tetrazine-based catecholamide derivative and its evaluation as a chelating agent for removal of Cd(II), Co(II), and Cu(II) |
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| Authors: | Shan Lei Qingchun Zhang Shijin Chu |
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| Institution: | State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, China |
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| Abstract: | The synthesis and structural characterization of a tetrazine-based catecholamide (CAM) ligand, N,N′-bis(N″-(aminoethyl)-2,3-bis(hydroxy)benzamide)-1,2,4,5-tetrazine-3,6-diamine (5), were investigated. All compounds were characterized by 1H NMR spectroscopy, 13C NMR spectroscopy, and FTIR spectroscopy. The protonation equilibria of 5 and complexation capacities (log βpqr) of Cd2+, Co2+, and Cu2+ complexes of 5 were evaluated through potentiometric titration and spectrophotometric titration, respectively. Species independent pM value (=?log M]free) was used to compare metal affinities with the final sequence Cu2+ > Cd2+ > Co2+. Results show that 5 has potential for heavy metal removal. |
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| Keywords: | CAM ligand metal complexes spectrophotometric titration complexation capacities |
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