TABLE 4.

Comparison and assignment of major bands of terahertz spectra of theoretical spectrum and experimental spectrum of chlorpropamide polymorphs.

No	Peaks		Deviation	Description
	Exp.	Cal.
Ⅰ-a	0.90	1.17	0.27	δR-S-N-C-N-C-C-C
Ⅰ-b	1.09	1.41	0.32	ωC-C-C
Ⅰ-c	1.29	1.64	0.35	ωR; ωC-C-C
Ⅲ-a	0.92	1.16	0.24	δR-S-N-C-N-C-C-C
Ⅲ-b	1.11	1.41	0.30	ωR; ωC-C-C
Ⅲ-c	1.23	1.67	0.44	ωR; ωN-C=O; ωC-C-C; τSO2
Ⅲ-d	1.63	1.93	0.30	δN-C-N-C-C; τR-S-C=O

δ, scissor; ω, out-of-plane bending; τ, twisting, def-torsion.