Divalent cobalt and copper coordination complexes of κ2-N, O-derivatives of (Z)-1-R-2-(2′-oxazolin-2′-yl)-eth-1-en-1-ates: Structure and reactivity patterns

• Published in: Inorganica Chimica Acta 2021-01, Vol.514, p.119959, Article 119959
• Main Authors: May, Kathleen L., Resanović, Sanja, Chojnacka, Maja W., Herasymchuk, Krystyna, Vaughan, Douglas G., Zhu, Jianfeng, Wilson Quail, J., Lough, Alan J., Gossage, Robert A.
• Format: Article
• Language: English
• Subjects: Cobalt; Coordination compounds; Copper; Crystallography; Enolate; Libraries; Oxazoline; Single crystals; Solid phases; Stoichiometry
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2020.119959

[Display omitted] •Cu and Co coordination complexes of a hitherto virtually unexplored class of ligands.•Extensive structural characterization.•New ligand derivatives.•Unusual redox behavior.•Unusual ligand exchange observed during oxidation. The synthesis and characterisation of a small library of Co and Cu derivatives (29 examples) incorporating the (Z)-1-R1-2-(4′,4′-R2-2′-oxazolin-2′-yl)-eth-1-en-1-ate (1: R1 = alkyl or aryl; R2 = H or Me) skeleton is described. In the case where R2 = H, solid-state stable Co(II) materials of formula Co(κ2-N,O-L)2 could, in some cases, be obtained following base-induced deprotonation of 1 + H and treatment with hydrated CoX2 salts. These complexes display redox-induced solution decomposition behaviour giving Co(κ2-N,O-1)3 as one isolable product. Stable Cu(II) complexes could only be obtained in the case of for R1 = Ph and R2 = H. In the case of R2 = Me, distorted tetrahedral Co(II) compounds (also Co(κ2-N,O-1)2) are obtained as above (twelve examples). Square planar derivatives of Cu(II), of similar stoichiometry, are likewise isolated (eleven new examples). In contrast to the R2 = H reactions, all of these latter materials were found to be air-stable in solution or the solid phase. In total, 18 complexes have been characterised by single crystal X-ray diffraction. Molecular modelling (PM6(tm) and DFT) are also used to elucidate the molecular properties of selected complexes. Only a single Co complex (R1 = t-butyl and R2 = Me) of the library displays reversible one-electron redox properties.