A new dicobalt pyrophosphate, Co2P2O7.6H2O, has been synthesized and characterized by single crystal X-ray diffraction. The compound belongs to the monoclinic space group P21/n, and its unit cell dimensions are: a 7.2077(2), b 18.3373(5), c 7.6762(2) A, beta 92.4356(15),V 1013.64(5) A3, Z 4. The structural parameters were refined to an R index of 0.0570 for 1937 reflections with I >2sigma(Io). The framework of this pyropho- sphate is made bythe packing of layers of discrete CoO6 octahedra connected bydouble tetrahedra P2O7 groups. The (P2O7)4– anion group shows bent eclipsed conforma- tion. A comparative studyamong anhydrous (a-, b- and g-Co2P2O7) and hydrated forms (Co2P2O7 . 2H2O) of dico- balt pyrophosphates known in literature is presented.
Crystal structure of new hexahydrate dicobalt pyrophosphate Co2P2O7.6 H2O: comparison with Co2P2O7.2 H2O, alpha-, beta- and gamma-Co2P2O7
BERTOLASI, Valerio
2003
Abstract
A new dicobalt pyrophosphate, Co2P2O7.6H2O, has been synthesized and characterized by single crystal X-ray diffraction. The compound belongs to the monoclinic space group P21/n, and its unit cell dimensions are: a 7.2077(2), b 18.3373(5), c 7.6762(2) A, beta 92.4356(15),V 1013.64(5) A3, Z 4. The structural parameters were refined to an R index of 0.0570 for 1937 reflections with I >2sigma(Io). The framework of this pyropho- sphate is made bythe packing of layers of discrete CoO6 octahedra connected bydouble tetrahedra P2O7 groups. The (P2O7)4– anion group shows bent eclipsed conforma- tion. A comparative studyamong anhydrous (a-, b- and g-Co2P2O7) and hydrated forms (Co2P2O7 . 2H2O) of dico- balt pyrophosphates known in literature is presented.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
