Ryan E. Mewis
Side-bridged cyclam transition metal complexes bearing a phenolic ether or a phenolate pendent arm
Mewis, Ryan E.; Archibald, Stephen J.
Professor Steve Archibald S.J.Archibald@hull.ac.uk
Professor in Molecular Imaging Chemistry
Side-bridged cyclam transition metal complexes (M = Ni(II), Cu(II) and Zn(II)) bearing a phenolic ether or phenolate pendent arm have been synthesised. For [NiL1]+ and [CuL1]+, evidence for a phenoxyl radical was obtained (quasi reversible peak at +0.74 V and +0.48 V respectively), as well as oxidation of OH, due to protonation of the phenolate, at ∼+1.24 V. The phenoxyl radical in [Ni(L1)]2+ is harder to oxidise by 0.26 V compared with the corresponding Cu(II) complex. UV-Vis data for [Ni(L1)]2+ suggests that the Ni(II) ion may be 4 or 6 coordinate whereas the Cu(II) ion in [Cu(L1)]2+ is five coordinate. The Ni(II) ion in the crystal structure of [Ni(L2)][(ClO4)2] possesses a distorted square-planar geometry in which the phenolic ether pendent arm is not involved in the coordination sphere. The cyclam ligand in this complex adopts a trans-II configuration.
|Journal Article Type||Article|
|Publication Date||Oct 1, 2019|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Mewis, R. E., & Archibald, S. J. (2019). Side-bridged cyclam transition metal complexes bearing a phenolic ether or a phenolate pendent arm. Polyhedron, 171, 578-589. https://doi.org/10.1016/j.poly.2019.08.003|
|Keywords||Macrocyclic ligands; Azamacrocycles; Cyclam; Bioinorganic; Coordination chemistry|
|Additional Information||©2019, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/|
This file is under embargo due to copyright reasons.
Contact S.J.Archibald@hull.ac.uk to request a copy for personal use.
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