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Synthesis and crystal structure of Co(PO 3 OH) · H 2 O

1991; De Gruyter; Volume: 194; Issue: 3-4 Linguagem: Inglês

10.1524/zkri.1991.194.3-4.199

2196-7105

Iron oxide chemistry and applications

Abstract Syntheses under moderate hydrothermal conditions yielded single crystals of the compound Co(PO 3 OH) · H 2 O: a = 15.956(3) Å, c = 7.703(2) Å, space group R [unk], Z = 18. The crystal structure was determined from 932 X-ray reflections with sin θ / λ ≤ 0.70 Å −1 ; Refinement gave R = 0.032. Slightly distorted CoO 6 octahedra (Co – O from 2.052(2) to 2.174(2) Å, 〈2.111 Å〉) share two common O – O edges resulting in helical ∞ 1 [CoO 4 ] rows parallel to [001]. These rows are interconnected by protonated phosphate tetrahedra. Within the phosphate tetrahedron the P – O distance to the hydroxyl group is 1.585(2) Å, the three other P – O distances range from 1.519(2) to 1.530(2) Å. The hydrogen bonds line the surface of unoccupied channels of diameter 4.63 Å running in [001]; O – H … O range from 2.654(4) to 2.720(5) Å.