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Issue 27, 2020
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Self-assembled tetramethyl cucurbit[6]uril–polyoxometalate nanocubes as efficient and recyclable catalysts for the preparation of propyl gallate

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Abstract

The development of cucurbit[n]urils–polyoxometalate (Q[n]–POM) hybrids with the same microshape and nanoscale features is highly desirable, yet remains a great challenge. Herein, we design and synthesize a class of Q[n]–POM hybrids and tetramethyl cucurbit[6]uril–phosphomolybdic acid (TMeQ[6]–PMA) nanocubes (NCs) via a facile one-step self-assembly method, as heterogeneous acid catalysts for greatly boosting the catalysts in term of activity and stability for the esterification of gallic acid and n-propanol to propyl gallate (PG). The Fourier transform infrared (FTIR) spectroscopy reveals that the self-assembled mechanism of TMeQ[6]–PMA NCs based on the outer-surface interaction of Q[n]s. The temperature programmed desorption experiments with ammonia and FTIR analysis of the pre-adsorbed pyridine results confirm that the coexistence of medium and strong acid sites and a larger number of Lewis acid sites other than Brønsted acidic sites on the catalyst surface. These new features make the as-prepared TMeQ[6]–PMA NCs exhibit a high PG conversion (95.6%) and excellent stability, which represents a better catalytic performance than other reported catalysts.

Graphical abstract: Self-assembled tetramethyl cucurbit[6]uril–polyoxometalate nanocubes as efficient and recyclable catalysts for the preparation of propyl gallate

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Supplementary files

Article information


Submitted
08 Apr 2020
Accepted
12 Jun 2020
First published
16 Jun 2020

New J. Chem., 2020,44, 11895-11900
Article type
Paper

Self-assembled tetramethyl cucurbit[6]uril–polyoxometalate nanocubes as efficient and recyclable catalysts for the preparation of propyl gallate

S. Li, W. Xia, Y. Zhang and Z. Tao, New J. Chem., 2020, 44, 11895
DOI: 10.1039/D0NJ01755H

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