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 [(CuO 6 )Mo 6 O 18 (As 3 O 3 ) 2 ]·4 H 2 O ( 1 ) and [Cu(arg) 2 ] 3 [TeMo 6 O 24 ]·8H 2 O ( 2 ) (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. 1 stands for the first one-dimensional (1D) chain organic–inorganic hybrid arsenomolybdate constructed from lantern-shaped [(CuO 6 )Mo 6 O 18 (As 3 O 3 ) 2 ] 4– units through dinuclear [Cu 2 (arg) 4 ] 4+ connectors, whereas 2 represents an unprecedented 1D chain organic–inorganic hybrid telluromolybdate built by Anderson-type [TeMo 6 O 24 ] 6– fragments via trinuclear [Cu 3 (arg) 6 ] 6+ bridges. Variable-temperature magnetic susceptibilities of 1 and 2 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 1 have been carried out in 1 mol L –1 H 2 SO 4 aqueous solution by entrapping it in a carbon paste electrode. 1 displays apparent electrocatalytic activities toward the reduction of nitrite and bromate.