(η⁴-s-cis-1,3-Butadiene)tetracarbonylchromium(0)

Abstract

In the title complex, [Cr(C4H6)(CO)4], the Cr0 atom shows a distorted octa­hedral environment from four C atoms of the carbonyl ligands and the two π-bonds of the s-cis-1,3-butadiene ligand. The complex has an approximate non-crystallographic mirror symmetry m passing through the chromium atom, two carbonyl ligands and the mid-point of the central C—C bond of the s-cis-1,3-butadiene ligand. The C—C bond lengths in the s-cis-1,3-butadiene ligand alternate, the terminal distances being shorter than the central distance.