A Cu-BTC metal–organic framework (MOF) as an efficient heterogeneous catalyst for the aerobic oxidative synthesis of imines from primary amines under solvent free conditions

Author(s): Boosa Venu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Varimalla Shirisha ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Bilakanti Vishali ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Gutta Naresh ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Ramineni Kishore ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Inkollu Sreedhar ⁶ ^, ⁷ ^, ⁸ ^, ⁵ , Akula Venugopal ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2020

Journal: New Journal of Chemistry

Publisher: Royal Society of Chemistry (RSC)

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Abstract

A Cu-BTC MOF catalyst has been identified as an efficient and reusable heterogeneous catalyst for imine formation under neat conditions.

Abstract

A Cu-BTC (MOF-199) [copper( ii)-benzene-1,3,5-tricarboxylate] catalyst has been synthesized and evaluated for imine synthesis from amine compounds under neat conditions. The performance of the Cu-BTC MOF was significantly higher than that of the CuO supported on Al ₂O ₃, TiO ₂ and SiO ₂ catalysts. The role of surface Lewis acid sites on the catalyst in the formation of imine products was illustrated by the pyridine-IR studies. The recovered Cu-BTC catalyst demonstrated consistent activity for five cycles under similar experimental conditions. The physicochemical properties of the catalysts were analyzed by XRD, BET-SA, FT-IR, UV-DRS, SEM, TEM, XPS and pyridine adsorbed DRIFT spectroscopy.