A. Muller et al., Pythagorean harmony in the world of metal oxygen clusters of the {Mo-11} type: Giant wheels and spheres both based on a pentagonal type unit, STRUCT BOND, 96, 2000, pp. 203-236
Polyoxometalate systems provide excellent models for the study of unusual m
olecular growth processes based on {Mo-11}-type building motifs/blocks lead
ing to unusual giant spherical and ring-shaped structures with stoichiometr
y {Mo-11}(n), (n = 12, 14, 16)-a Pythagorean harmony.