The present invention provides an improved acyclic anionic six-electron-donorancillary ligand suitable for being bonded in a transition metal complex. Thepresent invention also provides a transition metal complex that includes atleast one acyclic anionic six-electron-donor ancillary ligand which issuitable for use as an olefin polymerization catalyst. The complex includes aGroup 3 to 10 transition or lanthanide metal and one or more anionic orneutral ligands in an amount that satisfies the valency of the metal such thatthe complex has a net zero charge. The present invention also discloses amethod for making transition metal complex and a method for using the complexfor olefin polymerization.
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