Synthesis, structure, redox properties and azide binding for a series of biphenyl-based Cu(II) complexes

Jacky Chen; Robert Russo; Wilson Chao; Lawrence D. Margerum; Mitchell R. Malachowski; Ryan White; Zachary Thawley; Angelina Thayer; Arnold L. Rheingold; Lev N. Zakharov

doi:10.1039/B700114B

Synthesis, structure, redox properties and azide binding for a series of biphenyl-based Cu(ii) complexes†

Jacky Chen,^a Robert Russo,^a Wilson Chao,^a Lawrence D. Margerum,^a Mitchell R. Malachowski,*^b Ryan White,^b Zachary Thawley,^b Angelina Thayer,^b Arnold L. Rheingold^c and Lev N. Zakharov^c

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^a Department of Chemistry, University of San Francisco, San Francisco, CA, USA

^b Department of Chemistry and Biochemistry, University of San Diego, San Diego, CA, USA

^c Department of Chemistry and Biochemistry, University of California at San Diego, LaJolla, CA, USA

Abstract

A series of biphenyl-based N₃O ligands, 2, 4, 6, and 8 were synthesized and their Cu(II) complexes prepared. These complexes were characterized by a combination of elemental analysis, FAB-MS, UV-vis spectroscopy and electrochemistry. The structure of [Cu(N₃O-mpy-NO₂)Cl₂], 12 [N₃O-mpy = 2-(3-pyridylmethylimino)-2′-(2-methylaminophenol)biphenyl], was solved and showed that the ligand coordinates through the three nitrogens with the phenol oxygen uncoordinated. Titration of azide anion into solutions of the complexes in methanol resulted in the appearance of a new band between 485–495 nm at the expense of the starting peak at 380 nm. Cyclic voltammetry studies indicated that the complexes undergo quasi-reversible one-electron reductions in acetonitrile at potentials between 0.13–0.58 V vs. Ag/AgCl. The complexes were found to be weakly active for the oxidation of di-tert-butyl catechol (DTBC).

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Synthesis, structure, redox properties and azide binding for a series of biphenyl-based Cu(ii) complexes†

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Synthesis, structure, redox properties and azide binding for a series of biphenyl-based Cu(II) complexes

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