Point groups C.1, C.i, C.s
Hermann Mauguin symbol: 1
Molecules belonging to this group have other than identity no symmetry. Many complex organic molecules belong to this group. Simple examples are 2-butanol or chlorofluoramine ().
Hermann Mauguin symbol:
Molecules from this group also have identity (which all molecules have) only one inversion center. Examples are meso-tartaric acid and 1,2-dibromo-1,2-dichloroethane (HClBrC-CBrClH). The inversion center is only given in Schönflies symbology if it is the only symmetry element of the molecule in question. Groups are an exception if n is odd.
Hermann Mauguin symbol: m
To the group belong to molecules that (besides identity ) have only one mirror plane. Examples are quinoline, HN3, HOCl, OSCl2. Molecules belonging to this group occur often.