Single crystals of the potassium salt K
3(H
2O)
4[H
2SiVW
11O
40](H
2O)
8+x of the vanadium monosubstituted
![](/images/gifchars/alpha.gif)
DER=0>-Keggindo
decatunsgstosilicate were grown from an aqueous solution and analyzed by EDS, XRD, vibration and electronicspectroscopy, and
1H,
51V, and
29Si solid-state NMR spectroscopy. Results indicate the formation of a nanoporous-like compound of hexagonal symmetry (space group
P6
2) with large, water-filled channels running along the
c axis.A uniform distribution of vanadium over the 12 metal sites of the
![](/images/gifchars/alpha.gif)
-Keggin anion is observed by XRD. Two differentneighborhoods were characterized by
51V NMR in a 2:1 ratio (
![](/images/gifchars/<font color=)
delta.gif" BORDER=0 >
iso = -546.3 and -536.2 ppm), in accordance witha difference in the number of potassium ions in the second coordination shell of vanadium.