Nitrosyl-Metallkoordinationsverbindungen. II. Synthese und Eigenschaften von Kobalt- und Eisenkomplexen des Typs M(S,S) (N,N) NO

Nitrosyl Metal Coordination Compounds. II. Syntheses and Properties of Cobalt and Iron Complexes of the Type M(S, S) (N, N) NO Neutral complex compounds of the type M(S, S)(N, N)NO, with M = Co, Fe; S,S = malonitrildithiolate and N,N = azomethines of biacetyl with the amines aniline (acal) 1 , p-toluidine (acto) 2 , p-chloraniline (acca) 3 , and p-anisidine (acan) 4 , have been synthesized. By menas of molar measurements, IR, ESCA, and ESR spectroscopy including magnetic measurements it was established that the cobalt complexes 1a – 4a are diamagnetic, with a 5-fold coordinated square pyramidale structure, with a formally trivalent central metal ion and a negative charged NO ligand Co(d⁶)NO^?]²⁺. Iron complexes 1b — 4b coordinated in the same manner are paramagnetic with one unpaired electron located at the iron atom. The existence of the coordination unity Fe(d⁵)NO^?]²⁺ is obvoius.