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C399 Although from the same family, the two phosphates adopt two different crystal structures. Rb2MnP2O7.H2O crystallizes in the monoclinic P21/c space group with lattice parameters a = 5.3845(5)Å b = 10.241(1)Å c = 15.566(2) Å β=93.15(1)°, Z = 4, V = 857,00(4) Å3. Cs2MnP2O7 crystallizes in the orthorhombic Pnma (n°62) space group and the unit cell parameters are a = 16.3398(3) Å b = 5.3872(1) Å c = 9.8872(2) Å, Z = 4, V = 870,33(3) Å3. Both structures are however closely related. They can be described as a single axe stacking of undulating [MnP2O10]∞ layers; alkaline cations occupy the interlayer spaces. The water molecule in Rb2MnP2O7.H2O is positioned also between the [MnP2O10]∞ layers. Its presence is confirmed by the 1607cm-1, 3173cm-1 and 3545cm-1 absorption bands observed in the infrared spectrum. Some parallel can be made between the structures of Rb2MnP2O7. H2O / Cs2MnP2O7 [1] and some phosphates of the enlarged A2MP2O7 family like K2CuP2O7 [2]. On the other hand, within the entire A2MnP2O7 (A = Li, Na, K, Rb, Cs) family itself, every phosphate adopts a different crystal structure with either layered or 3D [MnP2O7] framework and various Mn coordination [1, 3 5].

Three-dimensional lanthanide MOF based on a linear ditopic dicarboxylate