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SrV 12 O 27  · 3 H 2 O, synthesized hydrothermally. Monoclinic  P 2 1 / m ;  a  = 11.684(2) Å,  b  = 11.126(2) Å,  c  = 9.052(2) Å,  β  = 110.94(2)°;  Z  = 2.  R ( F ) = 0.049,  R W  ( F ) = 0.039 for 3756 observed reflections. The structure includes a new vanadate framework V 4 O 9 , similar to the V 2 O 5  in vanadium bronzes  β -A  x  V 2 O 5 . The V 4 O 9  framework, forming a substructure with  b ′ =  b /3, consists of 2 × 3 columns of edge-sharing VO 6  octahedra and chains of edge-sharing VO 5  trigonal bipyramids. The columns and the chains run parallel to [010] and are connected through common corners of VO 6  and VO 5 . The columns neighbouring in [001] direction share two corners of octahedra per  b ′ period. The Sr atoms and H 2 O molecules are accommodated in the wide [010] tunnels characteristic of the V 4 O 9  framework.

Struktur des Strontiumvanadiumoxidhydrats, SrV 12 O 27 · 3 H 2 O: eine Vanadiumoxidbronze mit neuartigem Vanadatgerüst