Patent ID: 6881830
Filing Date: 2005-04-19
Classification: C08K,C09B

Abstract:
1. Metal complexes conforming to complexes of metals with an azo compound of the formula (I) or its tautomeric structures where R is OH, NH R′ is NH R wherein the metal is selected from the group consisting of scandium (Sc), yttrium (Y), cerium (Ce), praseodymlum (Pr), neodymlum (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu), wherein the metal complexes of the scandium group include two azo units per metal atom (2:1 complexes).