2-Methylimidazolate linkers of Pt@ZIF-8 are exchanged with imidazolate using solvent-assisted linker exchange (SALE) to expand the apertures of the parent material and create Pt@SALEM-2. Characterization of the material before and after SALE was performed. Both materials are active as catalysts for the hydrogenation of 1-octene, whereas the hydrogenation of cis-cyclohexene occurred only with Pt@SALEM-2, consistent with larger apertures for the daughter material. The largest substrate, β-pinene, proved to be unreactive with H2 when either material was employed as a candidate catalyst, supporting the contention that substrate molecules, for both composites, must traverse the metal-organic framework component in order to reach the catalytic nanoparticles.
Bibliographical noteFunding Information:
We gratefully acknowledge financial support from the National Science Foundation (NSF; Grant DMR-1334928). Acquisition of the data on trace analysis and gas chromatography instruments used in the IMSERC facility of Northwestern University was made possible by support from Northwestern University and NSF Grant CHE-0923236, respectively. This work made use of TEM and STEM instruments located in the EPIC facility (NUANCE Center-Northwestern University), which has received support from the MRSEC program (NSF Grant DMR-1121262) at the Materials Research Center, the Nanoscale Science and Engineering Center (NSF Grant EEC-0647560) at the International Institute for Nanotechnology, and the State of Illinois, through the International Institute for Nanotechnology. PXRD was recorded at the J. B. Cohen X-ray Facility at Northwestern University supported by the MRSEC program of the NSF (Grant DMR-1121262) at the Materials Research Center of Northwestern University. We thank Cassandra Whitford for assistance with STEM.
© 2016 American Chemical Society.
Copyright 2016 Elsevier B.V., All rights reserved.