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. 2023 May 6;21:149. doi: 10.1186/s12951-023-01890-7

Table 6.

Vibrational properties of each amide mode

Amide mode Potential energy distribution (PED) Raman shift (cm−1)
Amide I CO s(83), CN s(15), CCN d(11) 1618–1741
Amide II NH ib(49), CN s(33), CO ib(12), CCs(10), NC s(9) 1509–1592
Amide III NH ib(52), CCs(18), CN s(14), CO ib(11) 1226–1391
Amide IV CO ib(44), CCs(34), CNC d(11) 627–800
Amide V CN t(75), NH ob(38) 493–756
Amide VI CO ob(85), CN t(13) 600–655
Amide VII NH ob(64), CN t(15), CO ob(12) 202–226

s stretch; d deformation; t twist; ib in-plane bend, ob out-plane bend