T. Cai et al., NATURAL BOND ORBITAL STUDIES ON QUASI-AROMATICITY OF POLYOXOANION (M6O19)(Z-) (M = MO, W, Z = 2, M = V, NB, Z = 8), Progress in Natural Science, 7(5), 1997, pp. 554-561
The natural bond orbitals and McWeeny bond orders for polyoxoanians (M
6O19)(Z-) (M = Mo, W, Z = 2; M = V, Nb, Z = 8) have been calculated in
terms of Weinhold's natural bond orbital theory using DV-SCC-X alpha
method. it is shown that all polyoxoanions possess quasi-aromaticity.
They are compared with other aromatic systems.