Silicon–transition metal compounds. Part II. Preparation and properties of silylpentacarbonylmanganese

Abstract

Silylpentacarbonylmanganese, SiH₃Mn(CO)₅, has been prepared from NaMn(CO)₅ and iodosilane. Its physical properties, including u.v., mass, n.m.r., i.r., and Raman spectra are reported and discussed. It decomposes on heating above about 115° to give H₂, CO, SiH₄, and HMn(CO)₅ as chief volatile products, together with a dark solid that probably has a cross-linked skeleton of Si–Mn bonds. The Si–Mn bond in SiH₃Mn(CO)₅ is essentially unaffected by HCl and by HgX₂(X = Cl or I) and is cleaved slowly by water. On heating, HCl gives the chlorosilyl derivatives SiH_3–xCl_xMn(CO)₅(X= 1–3). Attempts at insertion reactions with CO or SO₂ were unsuccessful.