Transition-metal complexes with tridentate, nitrogen-containing ligands

A transition metal complex which comprises the following structural feature of the formula (Z)M (I), where the variables have the following meanings:

• M is a transition metal of group 3, 4, 5 or 6 of the Periodic Table of the Elements and
• Z is a ligand of the formula (II)
• , where
• A is CR1, SiR1 or P,
• R1 is hydrogen, C1-C20-alkyl, C2-C20-alkenyl, C6-C20-aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part, NR92, N(SiR93)2, OH, OSiR93, SiR93 or halogen,
• L1-L3 are each, independently of one another,
• were
• E1-E6 are each carbon or nitrogen,
• p is 0 when E1-E6 is nitrogen and is 1 when E1-E6 is carbon,
• R2-R8 are each, independently of one another, hydrogen, C1-C20-alkyl, C2-C20-alkenyl, C6-C20-aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part, NR92, N(SiR93)2, OR9, OSiR93, SiR93 or halogen, where the organic radicals R2-R8 may also be substituted by halogens and two vicinal radicals R2-R8 may also be joined to form a five- or six-membered ring and/or two vicinal radicals R2-R8 may be joined to form a heterocycle containing at least one atom from the group consisting of N, P, 0 and S, and
• R9 are each, independently of one another, hydrogen, C1-C20-alkyl, C2-C20-alkenyl, C6-C20-aryl, alkylaryl having from I to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part and two geminal radicals R9 may also be joined to form a five- or six-membered ring.