Communication
CrystEngComm
Analysis of the filtrate after the first cycle revealed that some
Ir leaches from the solid into the solution, which amounts to
3.6% of the total Ir used. This was most likely due to the ad-
ditional washing during the reaction of some loosely bound
Ir species in the Ir@CTF material. However, no significant
amounts of Ir were detected in the filtrate after the second
catalytic run (<1% of the total Ir). Therefore, the catalyst de-
activation observed upon reuse was (mainly) attributed to a
build-up of adsorbed products on the catalyst surface, pro-
gressively blocking the active sites. Meanwhile, the selectivity
to the ketone was maintained (or slightly increased) upon
consecutive reuses.
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Conclusions
A
nitrogen rich covalent framework constructed from
pyridinedicarbonitrile building block allows a molecular hetero-
geneous catalyst to be obtained, where CTF plays the role of the
scaffold and the base. The Ir@CTF catalyst allows straightfor-
ward handling and recycling under ambient conditions.
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Acknowledgements
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Financial support from the Generalitat Valenciana (projects
Consolider-Ingenio MULTICAT and AICO/2015/065), the Span-
ish Ministry of Economy and Competitiveness (MINECO)
(program Severo Ochoa SEV20120267), and the Spanish Min-
istry of Science and Innovation (MICINN) (project MAT2014-
52085-C2-1-P) are gratefully acknowledged. This project has
received funding from the European Union's Horizon 2020 re-
search and innovation programme under the Marie
Sklodowska-Curie grant agreement No 641887 (project acro-
nym: DEFNET). Also, financial support from the European
Union Seventh Framework Programme (FP7/2007-2013) under
the grant agreement number 309701, project Eco2CO2 is
acknowledged.
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