Synthesis and characterization of a tetranuclear copper(II) complex with a chiral Schiff base ligand

Abstract

Abstract The title complex l-[CuII4(Hvap)2(vap)2(MeOH)2](ClO4)2 1 has been synthesized and characterized by EA, IR, TGA, solid-state CD spectra and X-ray single-crystal analyses (l-H2vap: a Schiff base ligand derived from the condensation of o-vanillin and l-2-amino-3-phenyl-1-propanol). Complex 1 crystallizes in monoclinic system, chiral space group P21 with a = 10.4257(18), b = 21.695(4), c = 15.721(3) A, β = 94.443(3)°, V = 3545.1(11) A3, Z = 2, Cu4C70H78N4O22Cl2, Mr = 1652.42, Dc = 1.548 g/cm3, F(0 0 0) = 1704 and μ(MoKα) = 1.338 mm−1. The final R = 0.0682 and wR = 0.1420 for 6170 observed reflections with I > 2σ(I) and R = 0.1775 and wR = 0.1830 for all data. The structure of complex 1 contains a boat-shaped {Cu4O4} motif. The solid-state CD spectra confirm the chiral nature of complex 1.