Patent ID: 8440826

Claim:
An electroneutral complex of the formula I L Cu A (I) wherein L stands for a bidentate neutral ligand which corresponds to the formula II D 1 -G-D 2 (II) wherein G stands for a divalent organic bridging group selected from C 1 -C 8 alkylene, C 2 -C 8 alkenylene, C 2 -C 8 alkinylene O, S, SO, SO 2 , O-interrupted C 2 -C 8 alkylene, phenylene, substituted phenylene, or a direct bond and D 1 and D 2 , each independently, stand for an organic moiety containing an electron donating heteroatom selected from sulphur and/or phosphorus; A stands for a bidentate monoanionic ligand binding to Cu— wherein the monoanionic liqand A is of the formulae (VI) or (VII) wherein i and m independently are 0, 1 or 2; k is from the range 3-5; R independently is C 1 -C 12 alkyl, C 2 -C 8 alkenyl, halogen, nitro, amino, methoxy; X is H C 1 -C 12 alkyl or an equivalent of a cation such as Li+, Na+, K+, ½Ca2+, ½Mg2+, ½Zn2+.