Table 2.

Infrared frequency values of the symmetric and asymmetric stretching of the carboxylate groups.

ν COO- (cm−1) AgNP-Dic		νas COO- (cm−1)	∆(νa − ν)	[M] mol/L
1	1397	1575	178	3 × 10−3
2	1386	1575	189	1 × 10−3
3	1378	1614	236	1 × 10−4
Diclofenac	1401	1575	174
AgNP-Nap
1	1408	1604	196	3 × 10−3
2	1380	1604	224	1 × 10−3
3	1376	1613	237	1 × 10−4
Naproxen	1394	1584	190
AgNP-5-Cl
1	1384	1627	243	3 × 10−3
2	1383	1630	247	1 × 10−3
3	1383	1627	244	1 × 10−4
	1363	1527	164