Metal complexes

Abstract

Metal complexes of metals of the scandium group with an azo compound which conforms to the formula (I) or to one of its tautomeric structures where R is OH, NH 2 , NH—CN, arylamino or acylamino, R′ is NH 2 , NH—CN, arylamino or acylamino and R 1 and R 1′ are independently —OH or —NH 2 .

1 . A method of preparing pigments comprising formulating metal complexes conforming to complexes of metals of the scandium group with an azo compound, to the formula (I) or to one of its tautomeric structures  
       
         
           
           
               
               
           
         
       
       where 
 the metals of the scandium group are selected from the group consisting of scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu),  
 R is OH, NH 2 , NH—CN, arylamino or acylamino,  
 R′ is NH 2 , NH—CN, arylamino or acylamino and  
 R 1  and R 1′  are independently —OH or —NH 2 .  
 
     
     
         2 . Process for dyeing or pigmenting natural, synthetic or semisynthetic organic or inorganic materials comprising applying thereto the metal complexes prepared according to  claim 1 .  
     
     
         3 . Process for producing printing colours, distemper colours or binder colours, for mass coloration of synthetic, semisynthetic or natural macromolecular materials, selected from the group consisting of polyvinyl chloride, polystyrene, polyamide, polyethylene or polypropylene, and for spin-dyeing of natural, regenerated or artificial fibres, selected from the group consisting of cellulose, polyester, polycarbonate, polyacrylonitrile or polyamide fibres, and for printing textiles and paper comprising applying thereto the metal complexes prepared according to  claim 1 .  
     
     
         4 - 21 . (Cancelled)