  Density functional theory within the two-component quasi-relativistic
zeroth-order regular approximation (ZORA) is used to predict parity violation
shifts in 183W nuclear magnetic resonance shielding tensors of chiral,
tetrahedrally bonded tungsten complexes of the form NWXYZ (X, Y, Z = H, F, Cl,
Br or I). The calculations reveal that sub-mHz accuracy is required to detect
such tiny effects in this class of compounds, and that parity violation effects
are very sensitive to the choice of ligands.
