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

✍ Scribed by Capitelli, F.; Harcharras, M.; Assaaoudi, H.; Ennaciri, A.; Moliterni, A. G. G.; Bertolasi, V.

• Book ID: 120328491
• Publisher: Oldenbourg Wissenschaftsverlag
• Year: 2003
• Tongue: English
• Weight: 225 KB
• Volume: 218
• Category: Article
• ISSN: 2194-4946
• DOI: 10.1524/zkri.218.5.345.20738

✦ Synopsis

Abstract

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>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.