title: Highly dispersed palladium(II) in a defective metal-organic framework: application to C-H activation and functionalization.
abstract: High reversibility during crystallization leads to relatively defect-free crystals through repair of nonperiodic inclusions, including those derived from impurities. Microporous coordination polymers (MCPs) can achieve a high level of crystallinity through a related mechanism whereby coordination defects are repaired, leading to single crystals. In this work, we discovered and exploited the fact that this process is far from perfect for MCPs and that a minority ligand that is coordinatively identical to but distinct in shape from the majority linker can be inserted into the framework, resulting in defects. The reaction of Zn(II) with 1,4-benzenedicarboxylic acid (H(2)BDC) in the presence of small amounts of 1,3,5-tris(4-carboxyphenyl)benzene (H(3)BTB) leads to a new crystalline material, MOF-5(O(h)), that is nearly identical to MOF-5 but has an octahedral morphology and a number of defect sites that are uniquely functionalized with dangling carboxylates. The reaction with Pd(OAc)(2) impregnates the metal ions, creating a heterogeneous catalyst with ultrahigh surface area. The Pd(II)-catalyzed phenylation of naphthalene within Pd-impregnated MOF-5(O(h)) demonstrates the potential utility of an MCP framework for modulating the reactivity and selectivity of such transformations. Furthermore, this novel synthetic approach can be applied to different MCPs and will provide scaffolds functionalized with catalytically active metal species.
authors: Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, USA.
authors: Tae-Hong
authors: TH
authors: Park
authors: Amanda J
authors: AJ
authors: Hickman
authors: Kyoungmoo
authors: K
authors: Koh
authors: Stephen
authors: S
authors: Martin
authors: Antek G
authors: AG
authors: Wong-Foy
authors: Melanie S
authors: MS
authors: Sanford
authors: Adam J
authors: AJ
authors: Matzger
mesh_terms: D003460:Crystallization; D009930:Organic Chemicals / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D033362:Powder Diffraction
chemical_list: D009930:Organic Chemicals; D010165:Palladium