# IR and Raman spectroscopy

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## Point groups C.1, C.i, C.s

### C.1

Hermann Mauguin symbol: 1

Molecules belonging to this group have other than identity $e$ no symmetry. Many complex organic molecules belong to this group. Simple examples are 2-butanol or chlorofluoramine ($\text{H}\text{N}\text{Cl}\text{F.}$).

### C.i

Hermann Mauguin symbol: $1¯$

Molecules from this group also have identity $e$ (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 $C.ni$if n is odd.

### C.s

Hermann Mauguin symbol: m

To the group $C.s$ belong to molecules that (besides identity $e$) have only one mirror plane. Examples are quinoline, HN3, HOCl, OSCl2. Molecules belonging to this group occur often.