American Chemical Society
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Chromium Complexes with Acenaphthene Imine Derivative Ligands Synthesis and Catalysis on Diene Polymerization

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posted on 2016-02-22, 19:25 authored by Bo Gao, Wei Gao, Qiaolin Wu, Xuyang Luo, Jingshun Zhang, Qing Su, Ying Mu
Treatment of the bis(arylimino)acenaphthene (BIAN) ligands with CrCl2(THF)2 in THF affords mononuclear complexes of ArBIANCrCl2(THF)2 (3a, Ar = 2-iPrC6H4; 3b, Ar = 2,6-Me2C6H3) and chlorine-bridging dinuclear complexes ArBIANCrCl(μ-Cl)3Cr(THF)ArBIAN (3c, Ar = 2,6-Et2C6H3; 3d, Ar = 2,6-iPr2C6H3). The molecular structures of 3b3d were characterized by X-ray diffraction analysis, and all the chromium atoms are in octahedral geometries. Similar reactions of N-(arylimino)acenaphthenones with CrCl2(THF)2 afford the dinuclear chromium complexes with 1,1′-bis(2-aryliminoacenaphthene-1-olate) tetradentate ligands ArBIAOCr2Cl4(THF)2 (4b, Ar = 2,6-Me2C6H3; 4c, Ar = 2,6-Et2C6H3) via a pinacol cross-coupling reaction. Upon activation with MAO, these complexes show moderate-to-high activities in butadiene and isoprene polymerization, affording a cis-1,4-enriched polymer.