Herein, two novel
mesoporous cross-linked poly(vinyl imidazole)s
with sulfonic acid tags, [PVI-SO3H]Cl (1)
and [PVI-SO3H]FeCl4 (2), were prepared
and characterized by a variety of techniques such as Fourier transform
infrared spectroscopy, scanning electron microscopy, elemental mapping,
energy dispersive X-ray analysis, transmission electron microscopy,
thermal gravimetry, derivative thermal gravimetry, and N2 adsorption–desorption isotherms (Brunauer–Emmett–Teller).
In addition, magnetic properties of poly(vinyl imidazole) sulfonic
acid iron(IV) chloride [PVI-SO3H]FeCl4 (2) as an ionically tagged magnetic polymer were investigated
using a vibrating sample magnetometer. The presented polymers, [PVI-SO3H]Cl (1) and [PVI-SO3H]FeCl4 (2), were successfully applied as reusable and efficient
catalysts for the preparation of N-heterocycle spiropyrans. The described
catalysts were recycled and reused with a marginal decrease in their
catalytic activities. The desired products were prepared under mild
and green conditions. The structures of the obtained products were
confirmed by various analysis techniques.
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