Growth and PhysioChemical Properties of Second-Order Nonlinear Optical L-Threonine Single Crystals

Table 7

Deuterated and undeuterated L-threonine assignments on IR bands.

Wavenumber (cm^−1)
Undeuterated	Deuterated	Assignments
3157, 3021		N–H stretch
2975	2975	C–H stretching
	2341, 2873	Symmetric stretching of CH3^+
	2250	Symmetric stretching of O–D
	2158	Stretching of N 𝐃𝟑^+
2050		Degenerative deformation of NH3^+ and torsional vibration of NH3^+
1623		Asymmetric stretching of COO^−
1481		Symmetric bending of NH3^+
	1616	Asymmetric stretching
1455		Degenerative deformation of CH3
	1457	Degenerative deformation of CH3
1417		Symmetric stretching of CO2^−
	1417	Symmetric stretching of COO^−
	1383	Symmetric deformation of CH3
	1358	C–O stretching
1246, 1318, 1346	1329	In-plane deformation of C–C–H
1184		NH3^+ rocking
	1102, 1157, 1182	Degenerate deformation of N 𝐃𝟑^+
1109		Rocking vibration of CH3
	1048, 1246	Rocking of CH3 group
931		C–C stretching
	933	N 𝐃𝟑^+ rocking
767		Out-of-plane bending vibration of CO2^−
	711	Wagging of CO2^−
701		In-plane deformation of COO^−
	701	Wagging of CO2^−
	550, 667	Out-of-plane bending vibration of OD
489	535	CO2^− rocking