Pintauer T, Jasieczek CB, Matyjaszewski K
Center for Macromolecular Engineering, Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
J Mass Spectrom. 2000 Nov;35(11):1295-9. doi: 10.1002/1096-9888(200011)35:11<1295::AID-JMS62>3.0.CO;2-F.
We report an electrospray ionization mass spectrometric study of Cu(I) and Cu(II) bipyridine complexes employed in atom transfer radical polymerization. Mass spectra of Cu(I)Br complexed with 2 equiv. of 4,4'-di(5-nonyl)-2,2'-bipyridine (dNbpy) in toluene, methyl acrylate or styrene showed the presence of Cu(I)(dNbpy)(2) cation and Cu(I)Br(2) anion. For the Cu(II)Br(2)/2dNbpy system, Cu(II)(dNbpy)(2)Br, Cu(II)(dNbpy)Br, Cu(I)Br(2), Cu(II)Br(3) and Cu(II)(dNbpy)Br(3) species were observed. In addition, for mixed Cu(I)Br/2dNbpy and Cu(II)Br(2)/2dNbpy systems, the negative ion mode showed only the presence of Cu(I)Br(2) anions, which are potentially formed through halogen exchange between Cu(II)Br(3) and Cu(I)(dNbpy)(2). Copyright 2000 John Wiley & Sons, Ltd.
