[Rh(cod)Cl]₂ complex immobilized on mesoporous molecular sieves MCM-41-a new hybrid catalyst for polymerization of phenylacetylene

详细信息    查看全文

• 作者：Balcar ; Hynek ; Cejka ; Ji&iacute ; Sedlá ; cek ; Jan ; Svoboda ; Jan ; Zedn&iacute ; k ; Ji&iacute ; et. al.
• 关键词：Hybrid catalyst ; MCM-41 ; Rhodium complexes ; Phenylacetylene polymerization ; Polyacetylenes
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2003
• 出版时间：September 1, 2003
• 年：2003
• 卷：203
• 期：1-2
• 页码：287-298
• 全文大小：215 K

文摘

A new hybrid catalyst affording polymerization of phenylacetylene (PhA) into high-molecular-weight (M_w = 180000) high-cis-polyphenylacetylene (PPhA) was prepared via immobilization of [Rh(cod)Cl]₂ (cod=η⁴-cycloocta-1,5-diene) on siliceous mesoporous molecular sieves MCM-41 modified by 3-aminopropyltrimethoxysilane. The polymerization was confirmed to proceed on anchored Rh-species and PPhA formed was continuously released into liquid phase, from which it was easily isolated. In comparison with related homogeneous catalysts, the hybrid catalyst provided comparable or even higher PPhA yields, considerably higher molecular weight of PPhA and reduced amounts of oligomeric by-products. The catalyst was found to be resistant to Rh leaching; however, chemical transformation of anchored Rh-species occurring during polymerization strongly reduced the possibility of catalyst re-using.