Synthesis and Crystal Structure of a Copper(II) Benzoate Complex Bearing a Bis-2,2′-Tetrahydrofuryl Peroxide Moiety

Abstract

Complex [Cu2(ben)4·2THF−(η1–O2)]∞ (2) (ben = C6H5CO2− benzoate; THF = tetrahydrofuran) was isolated when a solution of Cu2(ben)4·2THF (1) in THF upon natural sunlight irradiation yields crystals suitable for single-crystal X-ray diffraction analysis. 2, crystallized in the C2/c monoclinic space group, Z = 8, V = 3394.2 (4) A3, and the unit cell parameters a = 9.7935 (7) A, b = 19.0055 (13) A, c = 18.2997 (13) A, α = 90°, β = 94.7996 (11)o and γ = 90°. This is the first example of a polymeric copper(II) carboxylate compound stabilizing a peroxo group via its apical ligand (THF molecule). Additionally, 2 was also characterized by elemental analysis, Fourier-transformed infrared spectroscopy (FTIR) and Raman spectroscopy. Upon sunlight irradiation a solution of Cu2(ben)4·2THF (ben = C6H5CO2−, benzoate; THF = tetrahydrofuran) in THF yields [Cu2(ben)4·2THF–(η1–O2)]∞ as a polymeric copper(II) carboxylate compound stabilizing a peroxo group via its apical ligand (THF molecule).