Ascorbic Acid and Polyphenols Mediated Green Synthesis of Silver Nanoparticles from Tagetes erecta L. Aqueous Leaf Extract and Studied Their Antioxidant Properties

Table 1

Peak position and assignment of main IR absorption bands of aqueous leaf extract and silver nanoparticles.

S. No.	Sample	Peak position wavenumber (cm^−1)	Peak assignment
1	Aqueous leaf extract	3415	O-H stretching (alcohol & phenol)
		2922	C-H stretching (alkanes)
		1829, 1399, &1060	C-O stretching and C=O stretching (alcohol, ethers, carboxylic acids, and esters all have carbonyl functional groups)
		1643-1564	N-H stretching (amide linkages of proteins)
		1490	C=C stretching (aromatic compounds)
		670	O-H bend
		609	C-H bending
2	Silver nanoparticles (AgNPs)	3388	O-H stretching (alcohol & phenol)
		2933	C-H stretching (hydrocarbons such as alkanes & aldehydes)
		1829, 1399, & 1060	C-O stretching and C=O stretching of carbonyl bands shifted (clearly indicating the coordination of carboxylic acid with AgNPs)