Patent ID: 7414133

Claim:
A compound of the formula (1) or (2) where the symbols and indices are each defined as follows: M is Pd or Pt; X is Cl, Br or I; Y is O, S, Se or NR 1 ; R is the same or different at each instance and is H, F, Cl, Br, I, NO 2 , CN, a straight-chain or branched or cyclic alkyl or alkoxy group having 1 to 20 carbon atoms, in which one or more nonadjacent CH 2 groups may be replaced by —O—, —SiR 1 2 —, —S—, —NR 1 — or —CONR 1 — and in which one or more hydrogen atoms may be replaced by F, or an aryl or heteroaryl group having from 4 to 14 carbon atoms which may be substituted by one or more nonaromatic R radicals, and a plurality of R substituents, either on the same ring or on the two different rings, may together in turn form one further aliphatic or aromatic, mono- or polycyclic ring system; R 1 are the same or different at each instance and are each H or an aliphatic or aromatic hydrocarbon radical having from 1 to 20 carbon atoms; a is 0, 1, 2, 3 or 4; b is 0, 1, 2 or 3; and n is 1 or 2.