An organometallic complex having formula (I)
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- wherein M is a transition metal; each A1 and A2 is
independently a monodentate ligand, or A1 and A2 are covalently
joined together to form a bidentate ligand; R1 is H, C1-18
alkyl, C1-18 alkoxy, C3-18 heteroalkyl, C3-20 aryl,
C3-20 heteroaryl, or C3-20 cycloalkyl; R2 is the
same or different and is H, C1-18 alkyl, C1-18 alkoxy, C3-18
heteroalkyl, C3-20 aryl, C3-20 heteroaryl, or C3-20
cycloalkyl, or two R2 groups link together with the carbon atoms
to which they are attached to form a 4- to 12-member aromatic or heteroaromatic
ring; R3 is the same or different and is H, CN, tricyanovinyl, halogen,
CX3, C1-18 alkyl, C1-18 alkoxy, C3-18 heteroalkyl,
C3-20 aryl, C3-20 heteroaryl, or C3-20 cycloalkyl,
wherein X is halogen; m is the charge of M; n is 1, 2, or 3.
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