Abstract
Single crystals of ACu(HSeO3)Cl2 (A = Rb, Cs) were prepared through hydrothermal reactions. They crystallized in the triclinic P-1 space group with similar lattice parameters: a = 6.6955(2) Å, b = 7.3492(2) Å, c = 7.4457(2) Å, α = 109.368(2)o, β = 109.919(2)o, and γ = 97.496(2)o for RbCu(HSeO3)Cl2 and a = 6.9183(2) Å, b = 7.4541(2) Å, c = 7.5723(2) Å, α = 108.329(2)o, β = 110.006(2)o, and γ = 98.024(2)o for CsCu(HSeO3)Cl2. The crystal structures of these isomorphic compounds consisted of unusual [Cu(HSeO3)Cl2] chains, where the elongated apical Cu–Cl distances in an elongated CuO4Cl2 octahedron, stabilized by the Jahn-Teller effect, constrained the symmetry, as well as the size of the alkali cations. The magnetic characterization of ACu(HSeO3)Cl2 revealed weak ferromagnetic interactions along the chains of CuO2Cl4 octahedra.
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