Über die Natur von Schwermetallkomplexen aus 2‐(2‐Hydroxyphenyl)‐4‐carboxy‐2‐ H ‐napht[1.2‐d]triazolen

2‐(2‐hydroxyphenyl)‐4‐carboxy‐naphtho [1.2‐d] triazoles are terdentate ligands which can form 1:1 complexes with Cu II and Ni II ions, and 1:1 as well as 1:2 complexes with Cr III ‐ions. All these complexes are characterized by ortho ‐condensed 6/6‐membered rings, the 1:2 chromium complexes having the D REW ‐P FITZNER arrangement. This behaviour, which differs from that of comparable o ‐hydroxy‐ o ′‐carboxy‐diaryl azo‐dyestuffs, is due to the different dimensions of the compared ligands.