Die Mössbauer‐Spektren des Eisen(II)‐phthalocyanins, FePc, der anionischen Komplexe des Typs [FePc]n− (n = 1, 2, 3, 4) und des Kations [FePc]+ wurden bei verschiedenen Temperaturen aufgenommen. Die Isomerieverschiebungen und Quadrupolaufspaltungen und ihre Temperaturabhängigkeit sind auf der Grundlage einer MO‐Behandlung der Komplexe interpretiert.

Intramolecularly Stabilized Metal Amides: 2-(Dimethylaminomethyl)pyrrolyl Complexes of Titanium(III), Vanadium(III), Chromium(III), Cobalt(I1) and Nickel(I1)By the metallation of 2-(dimethylaminomethy1)pyrrol (HL) of these new compounds are discussed on the basis of mawith butyllithium the lithium pyrrolide LiL (1) was obtained. gnetic and visible absorption measurements. An X-ray cry-

Starting from usual principles of redox stability in coordination chemistry and from the donor‐acceptor characteristic of organyl ligands the review covers the redox behaviour of transition metals in the coordination with simple carbanions. The main topics are the stabilization of high oxidation states and the electron variability in s̀‐organyl transition metal complexes as well as the stabilization of low oxidation states, especially in electron rich phenyl complexes by coordination of lithium ions to the transition metal.

Dispersed atomic nickel(0) is formed during the reaction of the nickel‐σ‐organyl complexes with silanol groups at temperatures below 373 K. That nickel is oxidized to Ni(I) by protons of the silanol groups in a consecutive step. The Ni(I) portion amounts to about 70% w/w of the Ni used. Six different Ni(I) species are detected by electron paramagnetic resonance. They are stabilized by interaction with the silica surface and the organic moieties; they act as anchor ions for the Ni(0) atoms. Ni(0) crystallites stabilized in this way are about 0.5 nm in diameter after a treatment at 373 K. The influence of the Ni(I) ions on the collective, magnetic properties of the clusters is revealed by calculation of ferromagnetic resonance (FMR) spectra using the independent‐grain approach according to Schlömann and Kotyukov. A strain of about 10 GPa is brought about in the nickel crystallites by the interaction with Ni(I) ions. © 1998 John Wiley & Sons, Ltd.

Homoleptische metallorganische Innerkomplexe von 3d‐Elementen konnten erstmals auch durch Orthometallierung dargestellt werden. Es wird die Synthese und Charakterisierung von Cr(ppz)3 (ppz = 2′‐Anion des N‐Phenylpyrazols), Cr(ppy)3 (ppy = 2′‐Anion des 2‐Phenylpyridins), Co(ppz)3 und der neuen Verbindung Co(ppy)3 durch Orthometallierung von N‐Phenylpyrazol und 2‐Phenylpyridin mit CrPh3 · 3 THF und MgCoMes3Br · 5 THF beschrieben.