What question did this study set out to answer?

This research aims to synthesize two new BCo9-based polyoxometalates and evaluate their catalytic properties.

February 25, 2026Inorganic Chemistry1 citations

Construction of BCo 9 -Based Polyoxometalates with Banana- and Peanut-Shaped Structures: Catalytic Activity in Knoevenagel Condensation Reactions

CWCheng-Ri WangBeijing Institute of Technology HLHai-Lou LiBeijing Institute of Technology ZWZheng WangShihezi University

Key Points

This research aims to synthesize two new BCo9-based polyoxometalates and evaluate their catalytic properties.
Synthesized polyoxometalates under hydrothermal conditions.
Characterized structures involved boron-modified clusters and banana-shaped subunits.
Analyzed catalytic activity in Knoevenagel condensation reactions.
Compounds 1 and 2 demonstrated significant catalytic activity.
Both compounds effectively accelerated reactions between various aldehydes and malononitrile.
Distinct structural features correlate with catalytic performance.

Abstract

Two novel BCo9-based polyoxometalates, Cs3Na5H10BO (OH) 2Co9O (OH) (H2O) 3SiW6O26 (B-α-SiW9O34) 2·11H2O (1) and Cs13Na4H15BO (OH) 2Co9O (OH) (H2O) 32Co (H2O) GeW6O262 (B-α-SiW9O34) 4·16H2O (2), were synthesized under hydrothermal conditions. 1 contains a boron-modified V-shaped Co9 cluster, which is encapsulated by two SiW9O34 fragments and one SiW6O26 fragment. 2 is composed of two banana-shaped subunits linked by two CoO6 groups, and the configuration of the subunit is similar to the polyoxoanion of 1, where GeW6O26 fragment replaces the SiW6O26 fragment. Catalytic investigations indicate that compounds 1 and 2 can efficiently accelerate the Knoevenagel condensation reactions of various aldehydes with malononitrile.

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