Unprecedented 1/∞[β-Mo8O26]4− polymeric chains and four novel organic–inorganic hybrids based on Mo–POMs and azaheterocycles templates

Four novel organic–inorganic hybrid materials based on Mo–POMs and organic templates, namely [DEB] [β-Mo8O26] [NH4]2 (1), [BMIM] [β-Mo8O26]0.5·H2O (2), [BMIM] [1D-Mo8O26]0.5 (3) and {3D-[Cu(DIE)2] [1D-Mo8O26]0.5}∞ (4) [DEB= 1,1′-diethyl-4,4′-bipyridinium, BMIM=1,1′-bis(1-methylimidazolium)methylene, DIE=1,2-diimidazoloethane] have been hydrothermally synthesized and characterized by elemental analyses, IR spectroscopy, thermal gravimetric analysis(TGA) and single-crystal X-ray diffraction. Both compounds 1 and 2 are POMs-based supramolecular compounds consisted of independent [β-Mo8O26]4− anions and [DEB]2+ or [BMIM]2+ organic cations. Compound 3 is the first external template example of Mo–POMs-based supramolecular network incorporated with novel 1/∞[β-Mo8O26]4− polymeric chains. Compound 4 is a rare supramolecular structure that contains octamolybdate 1/∞[β-Mo8O26]4− polymeric chains interconnected via DIE ligands to form a 3D net. Moreover, it was indicated that these polyacid compounds had definite catalytic activities on the probe reaction of acetaldehyde oxidation to acetic acid with H2O2.