日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Synthesis of a solid chelating ligand for the formation of highly efficient heterogeneous catalyst is highly desired in the fields of organic synthesis and photo-chemistry of metal complexes. Here, we report the synthesis of a crystal-like periodic mesoporous organosilica containing 2,2′-bipyridine ligands within the framework. BPy-PMO has a unique pore wall structure in which bipyridine groups are regularly arranged and exposed on the pore surface, and forms metal complexes directly on the surface. Iridium complex immobilized on BPy-PMO showed excellent ligand properties for the direct C–H borylation of arenes, resulting in superior activity, durability, and recyclability to the corresponding homogeneous catalyst. These results demonstrate the great potential of BPy-PMO as a solid chelating ligand for heterogenization of metal complex catalysts without loss of catalysis performance. BPy-PMO will be an innovative solid chelating ligand to progress the chemistry on metal complex catalyzed organic reaction and photocatalytic reaction from solution system to solid-state systems aimed for industrial process.