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Title
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Nickel substituted polyoxometalates in layered double hydroxides as metal-based nanomaterial of POM–LDH for green catalysis effects
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Type
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JournalPaper
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Keywords
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,Nickel substituted layered double hydroxides, polyoxometalates
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Abstract
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Three nickel substituted Keggin-type polyoxometalates, -[SiW9O37{Ni(H2O)3] (denotedas SiW9Ni3), was intercalated into Zn3Al based Layered Double Hydroxide (Zn3Al-LDH) by the selective ion-exchange technique. The as-synthesized nanocomposite, SiW9Ni3@Zn3Al, was used as heterogeneous nanoreactor to promote the synthesis of drug-like aminoimidazopyridine small molecule skeletons via the well-known Ugi-type Groebke–Blackburn–Bienaymé reaction (GBB 3-CRs) in the absence of any acid/additive and under mild and solvent-free conditions. A synergistic catalytic effect between SiW9Ni3 polyoxometalate and Zn3Al-LDH precursors is evidenced by a higher catalytic property of the SiW9Ni3@Zn3Al composite compared to the individual constituents separately. Lewis/Bronsted acidity of the SiW9Ni3 polyoxometalate and Zn3Al-LDH precursors appear to be essential for the catalytic performance of the composite. Furthermore, the catalytic performance of SiW9Ni3@Zn3Al was also tested in GBB 3-CRs synthesis of amino imidazothiazole under mild and solvent-free conditions.
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Researchers
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Sadegh Rostamnia (Fourth Researcher), Ozra Qiyasi (First Researcher), Roushan Khoshnavazi (Third Researcher), Ahmad Gholami Afkham (Second Researcher)
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