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Borycz, Joshua
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article
Atomic Layer Deposition in a Metal-Organic Framework
Abstract
<p>NU-1000, a zirconium-based metal-organic framework (MOF) featuring mesoporous channels, has been postsynthetically metalated via atomic layer deposition in a MOF (AIM) employing dimethylaluminum iso-propoxide ([AlMe<sub>2</sub>O<sup>i</sup>Pr]<sub>2</sub>, DMAI), a milder precursor than widely used trimethylaluminum (AlMe<sub>3</sub>, TMA). The aluminum-modified NU-1000 (Al-NU-1000) has been characterized with a comprehensive suite of techniques that points to the formation of aluminum oxide clusters well dispersed through the framework and stabilized by confinement within small pores intrinsic to the NU-1000 structure. Experimental evidence allows for identification of spectroscopic similarities between Al-NU-1000 and γ-Al<sub>2</sub>O<sub>3</sub>. Density functional theory modeling provides structures and simulated spectra, the relevance of which can be assessed via comparison to experimental IR and EXAFS data. The catalytic performance of Al-NU-1000 has been benchmarked against γ-Al<sub>2</sub>O<sub>3</sub>, with promising results in terms of selectivity.</p>