. 2020 Jul 23;10(46):27633–27651. doi: 10.1039/d0ra04898d

Band frequencies from the FTIR spectra of levofloxacin, the Zn–Al LDH and Zn–Al LDH/levo.

No.	Name	Wavelength	Functional Groups
1	Levo	1085 cm⁻¹	C–halogen group
		1294 cm⁻¹	Amines (C–N)
		1730 cm⁻¹, 1645 cm⁻¹	Carbonyl group
		1250–1200 cm⁻¹	C–O–C of acrylates and ethers
		2800–3076.28 cm⁻¹	Aromatic group
		3278.35 cm⁻¹	N–H stretching vibration indicative of the C O stretching of the esteric group
		3412.78 cm⁻¹	Hydroxyl groups of –COOH
2	Zn–Al LDH	723.14 cm⁻¹, 614 cm⁻¹ and 416 cm⁻¹	Stretching vibrations of M–O and M–O–H
		1355.96 cm⁻¹	C–O asymmetric stretching due to carbonate ions
		1630 cm⁻¹	O–H bending vibration
		2970.38 cm⁻¹	Bonding between CO₃²⁻ and hydrogen in water
		3447.03 cm⁻¹	Adsorbed water and O–H groups
3	Zn–Al levo	1089.63 cm⁻¹, 1036 cm⁻¹	C–halogen group
		1362–1505.04 cm⁻¹	C–O asymmetric stretching due to carbonate ions
		2073 cm⁻¹	υ _C–O–C of acrylates and ethers
		3446.72 cm⁻¹	Hydroxyl groups of –COOH of adsorbed levo and O–H of LDH