Hydrothermal syntheses, structures and properties of two 3-D organic-inorganic hybrid mixed-valent polyoxovanadates [Ni(en)(2)] [(V4V2O14)-V-IV-O-V] and [Cu(en)(2)][(V2V3O12.5)-V-IV-O-V]

摘要

Two 3-D organic-inorganic hybrid mixed-valent polyoxovariadates [Ni(en)(2)] [(V4V2O14)-V-IV-O-V] (1) and [Cu(en)(2)][(V2V3O12.5)-V-IV-O-V] (2) (en = ethylenediamine) have been hydrothermally synthesized and characterized by elemental analyses, IR spectra, X-ray photoelectron spectroscopy (XPS) and single-crystal X-ray diffraction. The common feature of 1 and 2 is that both exhibit the 3-D organic-inorganic hybrid framework. It should be pointed out that the 3-D hybrid architecture of 1 is constructed from planar 2-D vanadium(IV/V)-oxygen layers through [Ni(en)(2)](2+) bridges, whereas the 3D hybrid framework of 2 is built by wavy 2-D vanadium(IV/V)-oxygen layers via [Cu(en)(2)](2+) connectors. The magnetic properties of I have been investigated and 1 behaves as the dominant antiferromagnetic interactions within V-IV centers. (C) 2014 Elsevier B.V. All rights reserved.