ORIENTATION OF COBALTOCENIUM CATIONS INTERCALATED INTO THE V2O5.1.6H(2)O XEROGEL DETERMINED BY SOLID-STATE H-2 NMR-SPECTROSCOPY

The orientations of [Co(C5D5)(2)](+) ions intercalated in the xerogel V2O5 . 1.6H(2)O have been studied using solid-state H-2 NMR spectrosco py. The cobaltocenium ions in microcrystalline samples of V2O5{Co(C5D5 )(2)}(0.2)(H2O)(0.5) are observed to be held rigidly in the lattice at all temperatures up to 450 K. Studies on oriented thin films of this intercalation compound have shown that the guest ions are arranged wit h their principal C-5-molecular axes oriented parallel to the V2O5 lay ers. A small angular deviation in the orientations of the [Co(C5D5)(2) ](+) cations from the parallel direction is observed; this is thought to arise from stacking faults within the host lattice.