Hydrothermal syntheses and characterization of two 1D chain complexes and tetra-capped Keggin clusters

Abstract

Two new compounds, [Ni(en)₂]{[Ni(en)₂]₂[Mo^VI ₆Mo^V ₂V^IV ₈O₄₀(SiO₄)]}[(NH₂)₂(C₂H₄)₂NH]·2H₂O(1) and [Ni(en)₂]{[Ni(en)₂]₂[Mo^VI ₅Mo^V ₃V^IV ₈O₄₀(VO₄)]}(en)·H₂O(2)(en=ethylenediamine), have been hydrothermally synthesized and characterized by elemental analysis, infrared(IR), X-ray photoelectron spectroscopy(XPS), electron spin-resonance(ESR) and thermogravimetric(TG) analysis and single-crystal X-ray diffraction(XRD) analysis. Both the compounds exhibit a 1D chain composed of bi-supporting tetra-capped Keggin clusters and nickle coordination fragments. The 1D chains are further assembled into a 3D supramolecular network with different packing modes via hydrogen bonds. The magnetic susceptibility of compound 1 demonstrates the presence of antiferromagnetic interactions.

Keywords

Hydrothermal synthesis / Polyoxometalate / Tetra-capped Keggin cluster / Magnetic susceptibility

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