Green Synthesis of 5-Arylidene-2,4-Thiazolidinediones Over FeAlPO-5 Catalysts (original) (raw)

Advanced Porous Materials, 2014

Abstract

ABSTRACT Iron containing AlPO-5 (Al/Fe = 75, 100 and 150) was synthesized hydrothermally in fluoride medium for catalytic applications. The framework incorporation of Fe3+ was confirmed by XRD from change in lattice parameters and shift in the angular position of the peaks. The DRS UV-vis spectrum revealed the absence of band gap excitation due to bulk iron oxide phase thus confirmed the framework incorporation of Fe3+ . The TPD (ammonia) study revealed the presence of weak acid sites in all the materials. The catalytic activity of the materials was examined for the Knoevenagel condensation of aromatic aldehydes with 2,4-thiazolidinedione in water-ethanol (4:1) solvent system at 100 °C. The reaction yielded high conversion and selectivity to 5-arylidene-2,4-thiazolidinedione.

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