Z. Naturforsch. 2014, 69b, 589 – 595
New Aromatic Bisguanidine Copper Complexes and Their Application in ATRP
Neue aromatische Bisguanidin-Kupfer-Komplexe und ihre Anwendung in der ATRP
Alexander Hoffmann1, Olga Bienemann2, Ines dos Santos Vieira2, and Sonja Herres-Pawlis1
1 Department Chemie, Ludwig Maximilians Universität München, Butenandtstr. 5–13, 81377 München, Germany
2 Anorganische Chemie II, Technische Universität Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany
Reprint requests to Prof. Dr. S. Herres-Pawlis. Fax: 089-218077904. E-mail: sonja.herres-pawlis@cup.uni-muenchen.de
Received February 8, 2014 / published online May 7, 2014
We synthesized and structurally characterized two new copper(II) monochelate complexes with the ligand 2,2′-(1,2-phenylenebis(1,1,3,3-tetramethyl)guanidine) (TMG2b), [Cu(TMG2b)Cl2] and [Cu(TMG2b)Br2]. Single-crystal structure determination has shown that the complexes [Cu(TMG2b)Cl2] and [Cu(TMG2b)Br2] both crystallize in the orthorhombic space group Pbcn. The copper atoms in all complex cations reside in a coordination environment between tetrahedral and square-planar geometry. Furthermore, the application of the copper complexes with TMG2b as ligand in atom transfer radical polymerization (ATRP) was investigated with styrene as monomer. This study has shown a controlled polymerization process with moderate conversions, but excellent molecular weight distributions that are evidence of a well-controlled ATRP. However, small changes in the ligand structure can have a high impact, and therefore process optimizations and ligand tuning are necessary to develop highly active catalysts for ATRP.
Key words: Bisguanidine Ligands, Copper Complexes, X-Ray, Polymerization, ATRP
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