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Synthesis and magnetic properties of a new polymorph of Cu2(VO4)(OH) with a quasi-2D layer structure.

A new polymorph of copper(ii) vanadate, Cu2(VO4)(OH), containing a layered magnetic sublattice, is synthesized by a hydrothermal reaction. It displays a 3D framework based on copper(ii) oxide layers which are further connected by VO4 tetrahedra through corner-sharing {V-O-Cu} bonds in the system. The copper(ii) oxide layer is constructed by the interactions of Cu3(μ3-OH) building units. Magnetic properties are investigated by means of magnetic susceptibility, magnetization and heat capacity measurements. The results indicate a typical long-range canted antiferromagnetic ordering below ∼10 K and weak spin frustration arising from the competition between antiferromagnetic and ferromagnetic interactions inside the irregular Cu3(μ3-OH) triangles.