Patent ID: 8846919

Claim:
A compound of formula II wherein A is optionally substituted phenyl or optionally substituted pyridinyl; D is optionally substituted phenyl or optionally substituted pyridinyl; is a delocalized bond; R 1 and R 2 are each independently selected from hydrogen, halogen, an optionally substituted (C 1 -C 20 ) hydrocarbon, —C(═O)—R 10 , —C(═O)NR 10 R 11 , —C(═O)OR 10 , —C(═S)NR 10 R 11 , —C(═S)—R 10 and —C(═S)OR 10 ; or R 1 and R 2 , together with the carbons to which they are attached, may be an optionally substituted non-aromatic ring; R 10 and R 11 are each selected independently from hydrogen, an optionally substituted (C 1 -C 20 ) hydrocarbon and a polar, neutral moeity; represents a coordinate covalent bond to a metal; and M is a metal that forms additional bonds to A and D; with the proviso that, when two azaallyl moieties are present, A and D are both unsubstituted pyridinyl, and R 1 and R 2 are both hydrogen, the metal cannot be zinc, iron, cobalt, or nickel.