Coordination-Driven Terpyridyl Phosphine Pd(II) Gels

• Published in: Chinese journal of chemistry Vol. 33; no. 1; pp. 141 - 146
• Main Authors: Li, Hongmiao, Tan, Xin, Zhang, Jianyong
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.01.2015; WILEY‐VCH Verlag; Wiley; Wiley Subscription Services, Inc
• Subjects: Chemistry; Chemistry, Multidisciplinary; coordination polymer; metal-organic gel; palladium; phosphine; Physical Sciences; Science & Technology; supported catalysis; COMPLEXES; METAL-ORGANIC GELS; SUZUKI-MIYAURA REACTION; CATALYST; coordination polymer; CROSS-COUPLING REACTIONS; METALLOGELS; supported catalysis; DIPHOSPHINE; palladium; phosphine; SUPRAMOLECULAR GELS; LIGAND; POLYMER GELS; metal-organic gel
• ISSN: 1001-604X; 1614-7065
• DOI: 10.1002/cjoc.201400479

Incorporation of phosphine‐Pd catalytic centers in gel network is an important strategy to develop highly active catalysts. In this contribution we show that catalytically active phosphine‐Pd(II) gels can be readily obtained via reaction of rigid bridging terpyridyl phosphines and Pd(II). The terpyridyl phosphines, Py2P2 and Py2P, contain one 4,2′:6′,4′ ′‐terpyridyl group and two/one diphenylphosphino groups. Reactions of Py2P2/Py2P and Pd(II) in CHCl3‐MeOH afforded the corresponding phosphine‐Pd(II) gels at room temperature or at elevated temperature (40°C). The gelation is driven by formation of metal‐organic coordination. Mild heating is important in triggering the formation of Py2P‐Pd(II) gel. The gels have a coherent, rigid spongy porous network of continuous nanometer‐sized particles. The phosphine‐Pd(II) gels showed high activity in the Suzuki‐Miyaura reactions of aryl bromides under ambient conditions and could be recycled and reused. Coordination‐driven phosphine‐Pd(II) gels have been prepared from rigid bridging terpyridyl phosphines and Pd(II), which show high activity in the Suzuki‐Miyaura coupling under ambient conditions.