Green Synthesis Characterization and Thermotropic Behaviour of O-Linked Glycopyranosides of Phenolic Esters

Table 8

Characteristic FTIR absorption bands of silica-supported acid catalysts.

Entry	Catalysts	FTIR bands, ν (cm^−1)
		Si-O	Si-O bending	Si-OH stretching	Si-O-Si	Si-OH	S=O
1	SiO2	519	801	967	1057	3250	—
2	SiO2-H2SO4	597	811	871	1054	3400	1400