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言語:
eng - English
日付:
2012-02-192012
出版の状態:
出版
ページ:
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出版情報:
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目次:
The highly porous metal organic framework MOF-5 was loaded with the metal–organic compound [Pd(C3H5)(C5H5)] by metal–organic chemical vapor deposition (MOCVD) method. The inclusion compound [Pd(C3H5)(C5H5)]@MOF-5 was characterized by powder X-ray diffraction (PXRD), Fourier-transform infrared (FTIR) spectroscopy, and solid-state nuclear magnetic resonance spectroscopy. It was found that the host lattice of MOF-5 remained intact upon precursor insertion. The –C3H5 ligand in the precursor is easier to lose due to the interaction between palladium and the benzenedicarboxylate linker in MOF-5, providing a possible explanation for the irreversibility of the precursor adsorption. Pd nanoparticles of about 2–5 nm in size was formed inside the cavities of MOF-5 by hydrogenolysis of the inclusion compound [Pd(C3H5)(C5H5)]@MOF-5 at room temperature. N2 sorption of the obtained material confirmed that high surface area was retained. In the Suzuki coupling reaction the Pd@MOF-5 materials showed a good activity in the first catalytic run. However, the crystal structure of MOF-5 was completely destroyed during the following reaction runs, as confirmed by PXRD, which caused a big loss of the activity.
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