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A new dicobalt pyrophosphate, Co 2 P 2 O 7 ·6H 2 O, has been synthesized and characterized by single crystal X-ray diffraction. The compound belongs to the mono clinic space group  P 2 1 / n , and its unit cell dimensions are:  a  = 7.2077(2),  b  = 18.3373(5),  c  = 7.6762(2) Å,  β  = 92.4356(15)°,  V  = 1013.64(5) Å 3 ,  Z  = 4. The structural parameters were refined to an  R  index of 0.0570 for 1937 reflections with  I &gt;2 σ ( I  o ). The framework of this pyro phosphate is made by the packing of layers of discrete CoO 6  octahedra connected by double tetrahedra P 2 O 7  groups. The (P 2 O 7 ) 4–  anion group shows bent eclipsed conformation. A comparative study among anhydrous ( α -,  β - and  γ -Co 2 P 2 O 7 ) and hydrated forms (Co 2 P 2 O 7 ·2H 2 O) of dicobalt pyrophosphates known in literature is presented.

Crystal structure of new hexahydrate dicobalt pyrophosphate Co 2 P 2 O 7 ·6H 2 O: comparison with Co 2 P 2 O 7 2H 2 O, α -, β - and γ -Co 2 P 2 O 7