作者:Vernon C. Gibson、Martin J. Humphries、Kilian P. Tellmann、Duncan F. Wass、Andrew J. P. White、David J. Williams                                    
                                    
                                        DOI:10.1039/b107490c
                                    
                                    
                                        日期:2001.10.23
                                    
                                    Studies on cobalt ethylene polymerisation catalysts bearing bis(imino) pyridine ligands strongly indicate that the activated species is not the anticipated cobalt(II) alkyl cation.