A catalyst composition comprising a neutral bimetallic diphenoxydiiminate complex of group 10 metals or Ni, Pd or Pt is disclosed. The compositions can be used for the preparation of homo- and co-polymers of olefinic monomer compounds.
 This invention was made with government support under Grant No. CHE 04157407 awarded by the National Science Foundation and Grant No. DE-FG02-86ER13511 awarded by the Department of Energy. The government has certain rights in the invention.