Hydrothermal synthesis and characterization of two new layered vanadium tellurites Cu(TATP)V2TeO8 and Cu(DPPZ)V2Te2O10

Two new vanadium tellurites, Cu(TATP)V₂TeO₈ (1) and Cu(DPPZ)V₂Te₂O₁₀ (2), (TATP=1,4,8,9-tetranitrogen-trisphene, DPPZ=dipyridophenazine) have been synthesized under hydrothermal conditions and structurally characterized by elemental analyses, IR, and single-crystal X-ray diffraction. Compound 1 features an interesting two-dimensional layer structure constructed by V₂TeO₈]_n double-chain-like ribbons linked by Cu(TATP)]²⁺ bridges. Compound 2 consists of two types of chiral layers: one left-handed and the other right-handed, which lead to racemic solid-state compound. In each layer, there exist two types of inorganic helical chains (V₄Te₄O₈)_n and (Te₂O₂)_n, with same handedness. Two types of helical chains are linked by μ₃(O6) atoms to generate a V/Te/O inorganic anionic layer. The Cu(DPPZ)]²⁺ cationic complex fragments are covalently bonded to the layer, projecting below and above the vanadium tellurites layer.