March 2011 issue
Cover illustration: Butadiene complexes of transition metals are model systems that allow a deeper understanding of the bonding situation between transition metal atoms and olefins that play an important role e.g. in photochemical ligand-exchange reactions or in catalysis. The coordination environment of the Cr(0) atom in the title compound, (4-s-cis-1,3-butadiene)tetracarbonylchromium(0), is best described as distorted octahedral formed by four carbonyl ligands and the electrons of the s-cis-1,3-butadiene ligand. See Reiss & Finze [Acta Cryst. (2011). E67, m333].