| abstract |
Disclosed are compounds, having the general formula: as well as corresponding salts or metal complexes, wherein:m = 0, 1; n = 0, 1;Z = CH, N;R₁ is selected from chlorine, bromine, fluorine, CF₃, phenyl, C₁-C₂-alkoxy, C₁-C₂-haloalkoxy, alkylthio, haloalkylthiowherein the halogen is Cl, Br, F;R₂ is H, fluorine, chlorine, bromine;R₃ represents H, CH₃, CN, or also F when m = 1 or when n = 1 and R₄, R₅ are H;R₄, R₅ are independently H or F;R₃ and R₄, when m= C, can furthermore represent, taken together, a second bond between the two carbon atoms to which they are linked in formula (I);R<sub>f</sub> is selected from the group formed by polyfluoroalkyls, polyfluoroalkenyls and polyfluoroalkynyls containing up to 4 carbon atoms, containing at least 2 F atoms and, optionally, other halogens selected from Cl and Br. |