Patent ID: 7601437

Claim:
An organometallic compound having a formula of: wherein M is a transition metal; R 1 is hydrogen, halogen, C 1-18 alkyl group, C 1-18 alkoxy group, C 3-18 heteroalkyl group, C 3-20 aryl group, C 3-20 heteroaryl group, or C 3-20 cycloalkyl group; R 2 is independently C 1-18 alkoxy group, C 3-18 heteroalkyl group, C 3-20 aryl group, C 3-20 heteroaryl group, or C 3-20 cycloalkyl group; R 3 is independently H, CN, tricyanovinyl, halogen, CX 3 , C 1-18 alkyl, C 1-18 alkoxy group, C 3-18 heteroalkyl group, C 3-20 aryl group, C 3-20 heteroaryl group, or C 3-20 cycloalkyl group, wherein X is halogen; and R 4 is independently C 1-3 alkyl group, C 1-3 alkoxy group, or C 1-3 alkyl group substituted with F, Cl, or Br.