Abstract
An iridium dihydride pincer complex [IrH2(POCOP)] is immobilized in a hydroxy‐functionalized microporous polymer network using the concepts of surface organometallic chemistry. The introduction of this novel, truly innocent support with remote OH‐groups enables the formation of isolated active metal sites embedded in a chemically robust and highly inert environment. The catalyst maintained high porosity and without prior activation exhibited efficacy in the gas phase hydrogenation of ethene and propene at room temperature and low pressure. The catalyst can be recycled for at least four times.
Highlights
The novel Microporous polymer networks (MPNs) features an inert environment with isolated anchor points for the immobilization of the highly active metal-organic complex, ensuring the formation of a single-site catalyst
There have been reports wherein different complexes immobilized on various supports were studied for gas phase hydrogenation of alkenes (Table S1).[11,20,50,55–57]
While immobilized metal catalysts in MPNs have been frequently used as catalyst in liquid phase, as mentioned before, functionalized MPNs are rarely applied for a gas phase catalytic reaction.[50]
Summary
Microporous polymer networks (MPNs) exhibit some intriguing properties such as the accessible high surface area, chemical robustness, and tunable functionality, which make these materials interesting for various applications and for immobilization of molecular catalysts.[26] Even though MPNs with various functional moieties in their backbone have been presented, some examples are solely composed of carbon and hydrogen and show no extended pconjugation, such as the highly porous PAF-1[27] or PPN-6.[28] If organometallic species could be grafted on such a MPN, this would ensure homogeneous distribution of a single-site catalyst over the entire surface area of a non-functional and inert organic polymer, a truly “innocent” support. We present the immobilization of an organometallic molecular iridium pincer complex on a high-surfacearea microporous polymer network (Scheme 1) and its application in catalytic gas phase hydrogenation of ethene and propene. The novel MPN features an inert environment with isolated anchor points for the immobilization of the highly active metal-organic complex, ensuring the formation of a single-site catalyst.
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