ChemInform Abstract: Coordinatively Unsaturated Tris(trimethylsilyl)silyl Complexes of Chromium, Manganese, and Iron.

ChemInform Abstract

CrCl₃, MnCl₂, and FeCl₂ react with (I) in ether solvents to afford the air- and moisture-sensitive, anionic silyl complexes (IIa)-(IIc). These low-coordinate complexes possess large magnetic moments consistent with high-spin electronic configurations. The tetraethylammonium salt (IId) of the Fe derivative is obtained by cation exchange and is structurally characterized by X-ray analysis (space group P2₁/c, Z=4). Acidolysis of (IId) with 1 equiv. of pyridinium hydrochloride gives the anionic pyridine complex (III). The chloride ligand in (IId) may be abstracted by Me₃SiOSO₂CF₃ giving the triflate analogue (IIe). The triflate ligand in (IIe) is weakly coordinated and is readily displaced by ethers yielding the neutral complexes (IV) and (V). The Mn analogue of (V) is obtained similarly in 76% yield.