Coloring keratin fibers with metal complexes

A composition comprising at least one metal complex or at least one ligand wherein said metal complex comprising a metal and a ligand of formula (3a)

• or
• a ligand of formula (4a)
• wherein
• substituent Z is unsubstituted or substituted and/or interrupted or uninterrupted alkyl or cycloalkyl;
• unsubstituted or substituted aryl or heteroaryl:
• or unsubstituted or substituted radicals of azo or azomethine compounds;
• halogen;
• hydroxyl;
• thiol;
• nitro;
• sulfo;
• cyano:
• guanidine;
• unsubstituted or substituted —OR8, —SR8, —O(CO)R8, —(CO)OR8, —NR10COR8, —CONR10, —OP(O)(OR8)2, —P(O)(OR8)2, —OS(O)2R8, —S(O)2OR8, —S(O)2NR8R9, NR8R9 or +NR8R9R10, wherein R8, R9 and R10 are independently of each other hydrogen;
• unsubstituted or substituted and/or interrupted or uninterrupted alkyl, cycloalkyl, alkylen;
• unsubstituted or substituted aryl or heteroaryl;
• unsubstituted or substituted radical of an azo or azomethine compound;
• or R8 and R9, together with the nitrogen atom linking them, forming an unsubstituted or substituted 5-, 6- or 7-membered ring, which may contain further heteroatoms;
• X1 and X2 are O, S or NR, wherein R is hydrogen;
• unsubstituted or substituted and/or interrupted or uninterrupted alkyl;
• unsubstituted or substituted aryl, heteroaryl. alkylsulphonyl or arylsulphonyl;
• m is 0,1, 2, 3 or 4;
• it being possible when a plurality of m is present to be selected independently of each other;
• and
• a ligand of formula (6)
• wherein
• R5 is unsubstituted or substituted heteroaryl or unsubstituted or substituted radical of an azo or azomethine compound;
• and R6 and R7 are independently of each other unsubstituted or substituted aryl or heteroaryl;
• unsubstituted or substituted radical of an azo or azomethine compound;
• halogen;
• hydroxyl;
• NR8R9, wherein R8 and R9 are independently of each other unsubstituted or substituted and/or interrupted or uninterrupted alkyl or cycloalkyl;
• unsubstituted or substituted aryl or heteroaryl;
• unsubstituted or substituted radical of an azo or azomethine compound;
• or R8 and R9, together with the nitrogen atom linking them, form an unsubstituted or substituted 5-, 6- or 7-membered ring which may contain further heteroatoms,
• with the proviso that a metal-complex of Fe2+ with 2,4,6-tris-(α-pyridyl)-1,3,5-triazine, 1,10-phenanthroline or 4′-phenyl-2-2′,2″-terpyridine is excluded.