Infrared Spectroscopic Characterization of Photoluminescent Polymer Nanocomposites

Table 2

Observed vibrational modes for acetylsalicylic acid [28–34].

Wavenumber (cm^−1)	Modes of vibration
3000–2500	νOH
3000–3100	νCH (ring)
2975–2950	νCH3
1749	νC=O (ester)
1680	νC=O (carboxy)	νC=C
1604	νC=O (ring)	δOH
1562	νCC (ring)
1456	νC=C	δCH (ring)	δCH3
1418	δOH	δCH3	δCOH
1368	δCH3	νCC (ring)	δCH (ring)
1303	δCOH
1292	δCOH
1256	δCH (ring)
1218	ν-O–CO–CH3	δCH (ring)
1183	ν-O–CO–CH3	δCH (ring)
1134	δCH (ring)
1093	δCH (ring)	νCC (ring)
1012	δ-O–CO–CH3	δCH3
915	δ-O–CO–CH3	νCC (ring)
839	δCH (ring)
803	δ-O–CO–CH3	δCC (ring)	δCH (ring)
791	δCH (ring)	νCOOH
753	δCH (ring)
704	δCH (ring)	δCC (ring)
666	δCH (ring)	δCOOH	δO–C=O