Homogeneous radical polymerization of 2‐hydroxyethyl methacrylate mediated by cyclometalated cationic Ruthenium(II) complexes with PF6− and Cl− in protic media |
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| Authors: | Maria Ortencia Gonzalez Diaz Salvador Lopez Morales Ronan Le Lagadec Larissa Alexandrova |
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| Institution: | 1. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México D.F., Mexico;2. Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México D.F., Mexico |
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| Abstract: | Cationic coordinatively saturated complexes of ruthenium(II), Ru(o‐C6H4‐2‐py)(phen)(MeCN)2]+, bearing different counterions of PF6? and Cl? have been used in the radical polymerization of 2‐hydroxyethyl methacrylate in protic media and acetone under homogeneous conditions. Exchange of PF6? by Cl? increases the solubility of the complex in water. Both complexes led to the fast polymerization under mild conditions, but control was achieved only in methanol and acetone and was better for the complex with Cl?. The polymerization accelerated in aqueous media and proceeded to a high conversion even with a monomer/catalyst = 2000/1, but without control. Polymerization mediated by complex bearing Cl? was slower in protic solvents but faster in acetone and always resulted in lower molecular weight polymers. Thus, the nature of the anion strongly affected the catalytic activity of the complexes and may serve as way of fine‐tuning the catalytic properties. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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| Keywords: | atom transfer radical polymerization (ATRP) cationic ruthenium complexes 2‐hydroxyethyl methacrylate living polymerization organometallic catalysts |
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