The Cyanido-Sulfate Anion [SO CN].

The reaction of the pyridine adduct of SO and tetra-n-butyl-ammonium cyanide, [N( Bu) ][CN] at room temperature leads to the unprecedented cyanido-sulfate anion [SO CN] stabilized in the salt [N( Bu) ][SO CN]. The anion is a pseudo-halogen congener of the well-known fluoro- and chloro-sulfates. The new anion has been studied by vibrational spectroscopy and theoretical calculations.