Crosslinked sulfonated polyacrylamide (Cross-PAA-SO3H) tethered to nano-Fe3O4 as a superior catalyst for the synthesis of 1,3-thiazoles

Table 1 Peak assignment of crosslinked Sulfonated Polyacrylamide (Cross-PAA-SO₃H)

Peak position (cm⁻¹⁾	Assignment
3100–3500	N–H stretching of NH₂, OH stretching of (–SO₃H)
1658	C=O stretching of CO in AAM and AAMPS
1545	N–H bending (Secondary amid band of AAMPS)
1042	Sulfonic acid (–SO₃H) group
1175–1216	Symmetric band of SO₂
1453	Stretching of the C–N band (amid)
700–800	N–H bending (primary amide)

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