Transformation from 3D Boron Organic Polymers to 1D Nanorod Arrays: Loading Highly Dispersed Nanometal for Green Catalysis

摘要

The increasing global demands for eco-friendly and low-cost catalysts have propelled the advent of nanosized non-noble-metal catalysts to replace traditional noble metals. In this work, ultrafine NiO nanoparticles were prepared rapidly in situ by the strategy of transforming three-dimensional (3D) metal boron organic polymers ([email?protected]~(2+)) to one-dimensional (1D) boron organic polymers ([email?protected]) nanorod arrays at room temperature. The 3D [email?protected]~(2+) can be quickly obtained by the interaction of 4,4′-bipyridine with Ni~(2+) and dodecaborate (B_(12)H_(12)~(2–)) in an aqueous solution. When Ni~(2+) is converted into NiO in situ, 1D [email?protected] nanostructure transformation from the 3D [email?protected]~(2+) framework was achieved due to the B–H···π interaction between B_(12)H_(12)~(2–) and 4,4′-bipyridine. Furthermore, [email?protected] exhibits high catalytic activity and rapid kinetics in the conversion of 4-nitrophenol to 4-aminophenol, and the high stability of 1D nanorod arrays guarantees the catalytic activity of [email?protected] to barely change under recycling for at least 10 times. [email?protected] also exhibits good catalytic performance and high selectivity characteristics in the catalytic reduction of a series of nitrobenzene derivatives. This strategy of using [email?protected]~(2+) for loading self-supporting nanometal not only exhibits a highly efficient catalytic hydrogenation of nitrobenzene and its derivative but also provides an effective technical route for designing self-supported nanometal materials.