Patent ID: 7385054

Claim:
A metal complex of formula (I) in which Hal stands for bromine or iodine, A 1 stands for the radical —CONR 1 —(CH 2 ) n —NR 2 —(CO—CHZ 1 —NH) m —CO—CHZ 2 —K, A 2 stands for the radical —NR 1 —CO—CHZ 2 —K, R 1 and R 2 are, independently of one another, a hydrogen atom, a C 1 -C 2 -alkyl group or a monohydroxy-C 1 -C 2 -alkyl group, Z 1 and Z 2 are, independently of one another, a hydrogen atom or a methyl group, n is the number 2-4, m is the number 0 or 1, and K stands for wherein X is a hydrogen atom or a metal ion equivalent of atomic numbers 20-29, 39, 42, 44 or 57-83, provided that at least two X stand for metal ion equivalents and optionally present free carboxy groups optionally are present as salts of organic and/or inorganic bases or amino acids or amino acid amides.