Wei-Jie Duan

Hydrothermal synthesis and structural characterization of the first mixed molybdenum–tungsten capped-keggin polyoxometal complex: {[Co(dien)]4[(AsVO4)MoV8WVI4O33(µ2–OH)3]}·2H2O

The first polyoxometal complex possessing affirmatory mixed molybdenum-tungsten capped Keggin-type structure has been hydrothermally synthesized.

Two New Supramolecular Hybrids Based on Bi-capped Keggin {PMo 12 V 2 O 42 } Clusters and Transition Metal Mixed-organic-ligand Complexes

Two supramolecular compounds [Cu(imz)2][Cu(phen)(imz)]2{[Cu(phen)]2[PMo6VIMo6VV2IVO42]}(1) and [Co2(2,2′-bpy)4(C2O4)][Co(2,2′-bpy)3][PMo7VIMo5VV2IVO42](2,2′-bpy)0.5·H2O(2)(phen=1,10′-phenanthroline, imz= imidazole, 2,2′-bpy=2.2′-bipyridine) have been synthesized hydrothermally and characterized by elemental analyses, infrared spectrum, UV-Vis, X-ray photoelectron spectroscopy(XPS), electron spin resonance(ESR) spectra, thermogravimetry analyses and single crystal X-ray diffraction analyses. Single-crystal X-ray diffraction analyses revealed that both the compounds represent the examples of compounds based on the bi-capped Keggin polyoxoanion {PMo12V2O42} and transition metal mixed-organic-ligand coordination complexes. Compound 1 consists of bi-capped Keggin polyoxoanion [PMo12V2O42]5− supported copper coordination groups, which are further inter-connected with two types of copper complex fragments forming a 3D supramolecular framework via π⋯π stacking, C-H⋯O and N-H⋯O hydrothermal bonding interactions. Compound 2 is a new hybrid consisted of polyoxoanion [PMo12V2O42]4−, [Co2(2,2′-bpy)4(C2O4)]2+ and [Co(2,2′-bpy)3]2+. There are no direct interactions in compound 2, but the polyoxoanions together with two different cobalt complex groups construct a 3D supramolecular network through C-H⋯O hydrogen bonding interactions.

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

Two new compounds, [Ni(en)2]{[Ni(en)2]2[MoVI6MoV2VIV8O40(SiO4)]}[(NH2)2(C2H4)2NH]·2H2O(1) and [Ni(en)2]{[Ni(en)2]2[MoVI5MoV3VIV8O40(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.