A Trivalent Vanadium Monophosphate with a Tunnel Structure: Cd3V4(PO4)6

✍ Scribed by S. Boudin; A. Grandin; M.M. Borel; A. Leclaire; B. Raveau

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 319 KB
• Volume: 110
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1133

✦ Synopsis

A new vanadium(III) monophosphate, (\mathrm{Cd}{3} \mathrm{~V}{4}\left(\mathrm{PO}{4}\right){6}), has been isolated and its structure has been determined from single-crystal (\mathrm{X})-ray diffraction data. It crystallizes in the monoclinic space group (C 2 / c) with (a=12.446(1) \AA, b=12.547(1) \AA, c=6.487(1) \AA), and (\beta=115.66^{\circ}(1)). The three-dimensional framework (\left[\mathrm{V}{4} \mathrm{P}{6} \mathrm{O}{24}\right]{\infty}) is built from bi-octahedral (\mathrm{V}{2} \mathrm{O}{10}) units linked through monophosphate groups. It can be described as the stacking of (\left[\mathrm{V}{2} \mathrm{P}{2} \mathrm{O}{12}\right]{\infty}) layers, parallel to ((\mathbf{1 0 0})) connected through layers of (\mathrm{PO}{4}) tetrahedra. The (\left[\mathrm{V}{2} \mathrm{P}{2} \mathrm{O}{12}\right]{\infty}) layers are themselves formed of (\left[\mathrm{VPO}{8}\right]{\infty}) chains running along (\mathrm{c}), connected through the corners of their polyhedra and the edges of the (\mathrm{VO}{6}) octahedra alternately. This structure forms small tunnels running along [001], [110], and [110], where the cadmium ions are located with distorted octahedral and trigonal prismatic coordinations. In fact, the (\left[\mathrm{Cd}{3} \mathrm{~V}{4} \mathrm{P}{6} \mathrm{O}{24}\right]_{\infty}) framework forms large empty tunnels running along [001]. (3 1994 Academic Press, Inc.