Hybrid Open-frameworks: structure determinations and ferromagnetism of MIL41 or (V(IV)O)2M(II)(H2O)4{HO3P---CH2---PO3}2·2H2O (M=Mn, Co, Ni, Zn): four mixed metallomethylendiphosphonates hydrothermally synthesized by using preassembled building units

X-ray powder diffraction data are reported for a series of multipyrazole compounds in this paper. This work shows that the unit cell dimensions determined by single crystal agree well with those of powder diffraction analysis.