Two new supramolecular compounds based on Ni(II)-Schiff-base and Keggin-type [PMo12O40]3-

Two polyoxometalate-templated nickel-Schiff-base compounds, {[Ni(L)2]2[PMo12O40][Cl] center dot 1.5DMF center dot H2O}n (1) and {[Ni(L)2]2[PMo12O40][Cl] center dot DMSO center dot CH3OH center dot 0.5H2O}n (2) (where L is 1,4-bis(4-imidazolyl)-2,3-diaza-1,3-butadiene), were synthesized in situ from Ni2+ and L in H2O/DMF/CH3OH or H2O/DMSO/CH3OH at room temperature and characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction analysis. The results of the single-crystal X-ray diffractions suggested that both compounds have the same packing of the Ni(II)-Schiff-base cation layer and Keggin anion layer. Thermogravimetric analyses suggested that two supramolecular compounds have similar thermal stabilities based on the same packing of the cation and anion layers.