The tetranuclear copper(II)-catecholate complex, [Cu(3,5-di-tert-butylcatecholate) (pyridine)]4 · 2CH3CN has been isolated from the reaction between Cu(0), pyridine and 3,5-di-tert-butyl-o-benzoquinone in acetonitrile solution in nearly quantitative yield. Brown crystals of C80H106N6O8Cu4 are orthorhombic, space group P212121, with a = 13.395(5), b = 24.287(11), c = 24.918(11) Å, Z = 4. The crystal structure determination allows for the cluster to be formulated as four square planar Cu(II) ions, each bonded to two oxygens of chelating catecholate, a pyridine nitrogen and a bridging oxygen from a neighbouring catecholate. The Cu Cu distances range from 3.152(1) to 3.572(1) Å. The tetranuclear complex exhibits an approximate parallel stacking of two pairs of coordination planes that is suggestive of a through-space pathway for antiferromagnetic interaction. It may also have a bearing on the observed catalytic oxidation by O2 in solution.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry