| abstract |
The present invention relates to a metal complex of an azo compound according to one of the compounds of the following formula (1) or its tautomeric structure, which hosts at least one guest compound as a pigment in a color filter of a liquid crystal display, wherein the metal complex is 1 of the azo compound with the metals Li, Cs, Mg, Cd, Co, Al, Cr, Sn, Pb, particularly preferably Na, K, Ca, Sr, Ba, Zn, Fe, Ni, Cu, Mn and La Corresponding to mono-, di-, tri- and tetraanions).n n n <Formula 1>n n n n n n n n In the formula,n n n R and R 'are independently OH, NH 2 , NH-CN, acylamino or arylamino,n n n R 1 and R 1 ′ are independently —OH or —NH 2 . |