0181676 - UFCH-W 20030103 RIV NL eng J - Journal Article
Balcar, Hynek - Čejka, Jiří - Sedláček, J. - Svoboda, J. - Zedník, J. - Bastl, Zdeněk - Bosáček, Vladimír - Vohlídal, J.
[Rh(cod)Cl]2 Complex Immobilized on Mesoporous Molecular Sieves MCM-41 ů A New Hybrid Catalyst for Polymerization of Phenylacetylene.
Journal of Molecular Catalysis A-Chemical. Roč. 203, 1/2 (2003), s. 287-298. ISSN 1381-1169. E-ISSN 1873-314X
R&D Projects: GA ČR GA203/02/0976
Institutional research plan: CEZ:AV0Z4040901
Keywords : hybrid catalyst * MCM-41 * rhodium complexes
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 2.264, year: 2003

New hybrid catalyst affording polymerization of phenylacetylene into high-molecular- weight (Mw = 180 000) high-cis polyphenylacetylene (PPhA) was prepared via immobilization of [Rh(cod)Cl]2 (cod = .eta.4-cycloocta-1,5-diene) on siliceous mesoporous molecular sieves MCM-41 modified by 3-aminopropyltrimethoxysilane. The polymerization proceeds in catalyst channels and PPhA formed is continuously released into the liquid phase, from which it can be easily isolated. In comparison with related homogeneous catalysts, the hybrid catalyst provides comparable or even higher PPhA yields, considerably higher molecular weight of PPhA and reduced amounts of oligomeric by-products. Catalyst is resistant to Rh leaching; however, chemical transformation of anchored Rh species occurring during polymerization strongly reduces a possibility of catalyst re-using.
Permanent Link: http://hdl.handle.net/11104/0078210