A compound having the formula IV; wherein: M is a second or third row transition metal; L is an ancillary ligand; dotted lines represent optional double bonds; X 2 is selected from C-R 2 or N; R 2 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3j halo, aryl and heteroaryl; R 5 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 7 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 12 is selected from alkyl, aryl, aralkyl, cycloalkyl and C R'; R 13 and R 14 are independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; additionally or alternatively R 13 and R 14 form a fused 5- or 6-membered cyclic group, wherein the fused cyclic group is optionally substituted with one of more substituents selected from alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 22 is selected from alkyl, aryl, aralkyl, cycloalkyl and C R'; R 23 and R 24 are independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; additionally or alternatively R 23 and R 24 form a fused 5- or 6-membered cyclic group, wherein the fused cyclic group is optionally substituted with one of more substituents selected from alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; each R' is independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, aryl and heteroaryl; each R" is independently selected from H, alkyl, alkenyl, alkynyl and aralkyl; n is 1 or 2; and m is 0 to 3, wherein when n is 1, m is 1 to 3, and when n is 2, m is 0.. M is a second or third row transition metal; L is an ancillary ligand; dotted lines represent optional double bonds; X 2 is selected from C-R 2 or N; R 2 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3j halo, aryl and heteroaryl; R 5 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 7 is selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 12 is selected from alkyl, aryl, aralkyl, cycloalkyl and C R'; R 13 and R 14 are independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; additionally or alternatively R 13 and R 14 form a fused 5- or 6-membered cyclic group, wherein the fused cyclic group is optionally substituted with one of more substituents selected from alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; R 22 is selected from alkyl, aryl, aralkyl, cycloalkyl and C R'; R 23 and R 24 are independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; additionally or alternatively R 23 and R 24 form a fused 5- or 6-membered cyclic group, wherein the fused cyclic group is optionally substituted with one of more substituents selected from alkyl, alkenyl, alkynyl, aralkyl, O-R', N(R') 2, SR', C R', C OR', C NR' 2, CN, CF 3, NO 2, SO 2 R', SOR', SO 3 R', Si(R") 3, halo, aryl and heteroaryl; each R' is independently selected from H, alkyl, alkenyl, alkynyl, aralkyl, aryl and heteroaryl; each R" is independently selected from H, alkyl, alkenyl, alkynyl and aralkyl; n is 1 or 2; and m is 0 to 3, wherein when n is 1, m is 1 to 3, and when n is 2, m is 0..