Intramolecularly stabilized metal amides: 2-(dimethylaminomethyl)pyrrolyl complexes of titanium(III), vanadium(III), chromium(III), cobalt(II) and nickel(II)

By the metallation of 2-(dimethylaminomethyl)pyrrol (HL) with butyllithium the lithium pyrrolide LiL (1) was obtained. The reactions of 1 with TiBr3 . 3 THF VBr3 . 3 THF, CrBr3 . 3 THF CoBr2 . 2 THF, and NiBr2 . 1.67 THF result in the forma tion of the 2-(dimethylaminomethyl)pyrrolyl complexes of type ML(3) (2-4), and ML(2) (5, 6), respectively. The structures of these new compounds are discussed on the basis of magnetic and visible absorption measurements. An X-ray crystal structure determination of 4 reveals a strongly distorted octahedral environment of the chromium atom with facial arrangement of the ligands.