Crystal and molecular structure of tricarbonyl-π-[1,1,1-tricarbonyl-2,3-dimethoxy-5-(diphenylmethyl)ferracyclopentadiene]iron(Fe–Fe), a product from the reaction between diphenyldiazomethane and tricarbonyl-π-[1,1,1-tricarbonyl-2,5-dimethoxyferracyclopentadiene]iron(Fe–Fe)

Abstract

The crystal and molecular structure of the title compound (2) have been determined by X-ray diffraction methods from photographic data. Crystals are monoclinic prisms, space group P2₁/c, with Z= 4 in a cell with a= 14·75, b= 8·95, c= 19·58 Å, β= 108·2°. The structure was solved by Patterson and Fourier methods and refined by least-squares techniques to R 0·125 for 1547 reflections. Both iron atoms have distorted octahedral co-ordination. The Fe–C–O systems are all slightly bent. The three C–C bond lengths in the five-membered ring are all 1·40 ± 0·01 Å, the iron atom lying 0·18 Å out of the plane through the other four atoms on the side away from the other iron atom. Fe–Fe is 2·54 Å.