π-Arene complexes: I. The crystal and molecular structures of π-benzenedicarbonyl-1,3-dithianechromium(0)and π-methylbenzoatedicarbonyl-1,3-dithianechromium(0)

The π-arene complexes π-benzenedicarbonyl-1,3-dithianechromium(0) and π-methylbenzoatedicarbonyl-1,3-dithianechromium(0) were studied by single crystal X-ray diffraction. These complexes have different conformations with the Cr(CO) 2[ S(CH 2) 3SC H 2] fragment in a near eclipsed orientation relative to the planar η 6-methylbenzoate ligand and in a staggered orientation in relation to the carbon atoms of the benzene ring. Internal parameters are in good agreement for both structures and a noticeable feature is the very short CrS bond distances of 2.346(3) and 2.354(2) Å.