Novel One-Dimensional Organic–Inorganic Polyoxometalate Hybrids Constructed from Heteropolymolybdate Units and Copper–Aminoacid Complexes

Two unique organic–inorganic hybrid heteropolymolybdates with copper–aminoacid complexes [Cu­(arg)₂]₂[(CuO₆)­Mo₆O₁₈(As₃O₃)₂]·4 H₂O (<b>1</b>) and [Cu­(arg)₂]₃[TeMo₆O₂₄]·8H₂O (<b>2</b>) (arg = l-arginine) have been prepared under the 110 °C hydrothermal environments and structurally characterized by elemental analyses, IR spectra, thermogravimetric (TG) analyses, and single-crystal X-ray diffraction. <b>1</b> stands for the first one-dimensional (1D) chain organic–inorganic hybrid arsenomolybdate constructed from lantern-shaped [(CuO₆)­Mo₆O₁₈(As₃O₃)₂]^4– units through dinuclear [Cu₂(arg)₄]⁴⁺ connectors, whereas <b>2</b> represents an unprecedented 1D chain organic–inorganic hybrid telluromolybdate built by Anderson-type [TeMo₆O₂₄]^6– fragments via trinuclear [Cu₃(arg)₆]⁶⁺ bridges. Variable-temperature magnetic susceptibilities of <b>1</b> and <b>2</b> have been investigated and both illustrate the weak antiferromagnetic coupling within copper centers mediated by the carboxyl groups of arg ligands. Moreover, the solid-state electrochemical and electrocatalytic properties of <b>1</b> have been carried out in 1 mol L^–1 H₂SO₄ aqueous solution by entrapping it in a carbon paste electrode. <b>1</b> displays apparent electrocatalytic activities toward the reduction of nitrite and bromate