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. 2021 Jun 14;14(12):3292. doi: 10.3390/ma14123292

Table 5.

Classification of the fundamental modes (k = 0) for the N,N-dimethylglycine –chloranilic acid (DMG+–CLA) co-crystal.

UCG Lattice Modes Internal Modes Selection Rules
Ci Ac. Trans. Rot. DMG+ CLA IR Raman
Ag 12 12 90 66 x2, y2, z2,
xy, xz, yz
Au 3 9 12 90 66 x, y, z

UCG—unit cell (factor) group; Ac.—acoustic modes; Trans.—translation modes; Rot.—rotation modes.