Construction of {BCo <sub>9</sub> }-Based Polyoxometalates with Banana- and Peanut-Shaped Structures: Catalytic Activity in Knoevenagel Condensation Reactions
Two novel {BCo<sub>9</sub>}-based polyoxometalates, Cs<sub>3</sub>Na<sub>5</sub>H<sub>10</sub>[BO(OH)<sub>2</sub>Co<sub>9</sub>O(OH)(H<sub>2</sub>O)<sub>3</sub>SiW<sub>6</sub>O<sub>26</sub>(B-α-SiW<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]·11H<sub>2</sub>O (<b>1</b>) and Cs<sub>13</sub>Na<sub>4</sub>H<sub>15</sub>[{BO(OH)<sub>2</sub>Co<sub>9</sub>O(OH)(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>{Co(H<sub>2</sub>O)GeW<sub>6</sub>O<sub>26</sub>}<sub>2</sub>(B-α-SiW<sub>9</sub>O<sub>34</sub>)<sub>4</sub>]·16H<sub>2</sub>O (<b>2</b>), were synthesized under hydrothermal conditions. <b>1</b> contains a boron-modified V-shaped {Co<sub>9</sub>} cluster, which is encapsulated by two SiW<sub>9</sub>O<sub>34</sub> fragments and one SiW<sub>6</sub>O<sub>26</sub> fragment. <b>2</b> is composed of two banana-shaped subunits linked by two CoO<sub>6</sub> groups, and the configuration of the subunit is similar to the polyoxoanion of <b>1</b>, where GeW<sub>6</sub>O<sub>26</sub> fragment replaces the SiW<sub>6</sub>O<sub>26</sub> fragment. Catalytic investigations indicate that compounds <b>1</b> and <b>2</b> can efficiently accelerate the Knoevenagel condensation reactions of various aldehydes with malononitrile.
Authors
- Meng‐Ze Jia
- Jin-Ni Zhao
- Zheng Wang (ORCID: https://orcid.org/0000-0003-4873-505X)
- Juan Chen
- Hai-Lou Li
- Guo-Yu Yang
- Cheng-Ri Wang
- Yu Wang
Institutions
- Beijing Institute of Technology (CN)
- Innovation Cluster (Canada) (CA)
Publication Details
- Journal
- Inorganic Chemistry
- Published
- 2026-02-23
- DOI
- https://doi.org/10.1021/acs.inorgchem.5c05913
- Primary Topic
- Polyoxometalates: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00