Table 3. Positions (cm^–1) of Distinctive Bands in the Mid Infrared Spectra of Polymorphs of 1.

		polymorph
section	type	1-I	1-III	1–112	1–107
a	ν(O–H)	3315	3264	3379	3555
b	ν(C=O)	1683	1689	1690	1682
c	ν(C–O)	1280, 1235	1284, 1236	1285, 1220	1288, 1219
d	ν(C–C–O) [in phase]	957	967	975	958
e	ν(C–H) [banding wagging]	772	772	775	780