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Two new ammonium diphosphates, Mn 0.5 NH 4 H 2 P 2 O 7 ·H 2 O  (1)  and MnNaNH 4 P 2 O 7 ·3H 2 O  (2) , have been synthesized and investigated by single crystal X-ray diffraction. Compound  (1)  crystallizes in the triclinic space group  P 1̅, and the unit cell dimensions are  a  = 7.0029(2) Å,  b  = 7.4401(2) Å,  c  = 7.8771(2) Å,  α  = 80.444(1)°,  β  = 71.359(1)°,  γ  = 87.408(1)°,  V  = 383.48(2) Å 3 ,  Z  = 2; compound  (2)  crystallizes in the monoclinic space group  Cc , with the following unit cell dimensions:  a  = 10.1124(4) Å,  b  = 16.4448(7) Å,  c  = 5.6000(3) Å,  β  = 104.304(2)°,  V  = 902.39(7) Å 3 ,  Z  = 4. Final residuals are:  R  = 0.0281 and  w  R  = 0.0769, by using 2356 reflections with  I  &gt; 2 σ ( I ), for  (1) ;  R  = 0.0301 and  w  R  = 0.0682, by using 2322 reflections with  I  &gt; 2 σ ( I ), for  (2) . The crystal packing of Mn 0.5 NH 4 H 2 P 2 O 7 ·H 2 O consists of layers parallel to  ac  plane formed by MnO 6  regular octahedra, H 2 P 2 O 7  double tetrahedra and ammonium cations. Strong hydrogen bonds embed the dihydrogendiphosphate groups in the framework. The crystal packing of MnNaNH 4 P 2 O 7 ·3H 2 O is made up of layers of P 2 O 7  double tetrahedra, NaO 7  monocapped octahedra and MnO 6  regular octahedra down  c . Water and ammonium cations molecules fill up the cavities between the above mentioned polyhedra. Strong hydrogen bonds complete the network.

Two new ammonium diphosphates: crystal structure of Mn 0.5 NH 4 H 2 P 2 O 7 ·H 2 O and MnNaNH 4 P 2 O 7 ·3H 2 O