pH-dependent assembly of 1D–2D structures based on both {V10O28} and [NiMo6O24H6]4 − units: Synthesis, structure and magnetic properties

Two novel complexes [H2N(CH2CH2)2O]4[Na(H2O)2{O(CH2CH2)2NH2}]2[Na(H2O)4]2[V10O28][NiMo6O24H6]·8H2O (1) and [H2N(CH2CH2)2O]6[Na(H2O)3]2[V10O28H2][NiMo6O24H6]·4H2O (2) containing both isopolyvanadate {V10O28} and [NiMo6O24H6]4 − units have been synthesized and structurally characterized for the first time, showing that the pH value of the reaction plays a key role in structure control of self-assembled processes. Compound 1 exhibits a novel one-dimensional (1-D) chain-like structure consisting of Anderson-type [NiMo6O24H6]4 − and isopolyvanadate [V10O28]6 − anions linked by Na+ ions. In compound 2 with the lower pH value, [NiMo6O24H6]4 − and [V10O28H2]4 − anions are bridged by [Na2O10] units to form the 2D extended layer. The magnetic properties of 1 and 2 are presented.