[Rh(cod)Cl]2 Complex Immobilized on Mesoporous Molecular Sieves MCM-41 ů A New Hybrid Catalyst for Polymerization of Phenylacetylene

0181676 - UFCH-W 20030103 RIV NL eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA203/02/0976
Výzkumný záměr: CEZ:AV0Z4040901
Klíčová slova: hybrid catalyst * MCM-41 * rhodium complexes
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 2.264, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0078210