The non-rigid molecule group theory (NRG) in which the dynamical symmetry operations are defined as physical operations is a new field in chemistry. Smeyers and Villa computed the r-NRG of the triple equivalent methyl rotation in pyramidal trimethylamine with inversion and proved that the r-NRG of this molecule is a group of order 648, containing a subgroup of order 324 without inversions (see J. Math. Chem. 28(4) (2000) 377–388). In this work, a computational method is described, by means of which it is possible to calculate the symmetry group of molecules. We study the full non-rigid group (f-NRG) of Sponge and Pina molecules with C 2 and C i point groups, respectively. It proved that these are groups of order 162 and 13122 with 54 and 3240 conjugacy classes, respectively. The character tables of these groups are also computed.
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Darafsheh, M.R., Farjami, Y., Ashrafi, A.R. et al. Full Non-rigid Group of Sponge and Pina. J Math Chem 41, 315–326 (2007). https://doi.org/10.1007/s10910-006-9076-y
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DOI: https://doi.org/10.1007/s10910-006-9076-y