Hydrothermal Synthesis of [ Mn₅（H₂PO₄）₂（PO₄）₂（H₂O）₄]Templated by Calixarene Under Mild Conditions

The title compound [Mn ₅（H ₂PO ₄） ₂（PO ₄） ₂（H ₂O） ₄] was hydrothermally synthesized in the presence of calix[4]arene-p-tetrasulfonate. The title compound was structurally characterized by X-ray single crystal diffraction. It crystallizes in the monoclinic space group C2/c with a=1.7629（4）nm, b= 0.91344（18）nm, c=0.94977（19）nm, β=96.52（3）°, V=1.5195（5）nm ³, Z=4 and R ₁=0.0283, and exhibits a three-dimensional framework and channel structure. It was proposed that calixarene can act as template during the formation of the title compound because calixarene can bind Mn 2+ through second-sphere coordination.