Stopping a chromium carousel: X -ray crystallographic and variable-temperature 13 C n. m. r. studies on dicarbonyl(hexaethylbenzene)-thiocarbonylchromium(0) and related complexes

The low temperature 13C n.m.r. spectrum of (C6Et6)Cr(CO)2CS shows the molecule to have Cs symmetry as it does in the solid state; this result provides the first clear evidence of cessation of tripodal rotation in a neutral half-sandwich compound of Cr.