| abstract |
Compounds of formula ##STR1## wherein R is hydrogen or a group ##STR2## M 1 and M 2 are each independently of the other an alkali metal or alkaline earth metal or aluminum or a group of formula ##STR3## wherein n is 1, 2 or 3, and R 1 , R 2 , R 3 and R 4 are hydrogen or C 1 -C 8 alkyl, n X 1 and X 2 are each independently of the other --N═ or --CH═, n Q 1 and Q 2 are each independently of the other radicals of formula ##STR4## These compounds have excellent suitability for pigmenting organic material of high molecular weight, preferably polyolefins, and have superior lightfastness. |