S-Nitrosothiol and Nitric Oxide Reactivity at Zinc Thiolates

S-Nitrosothiols undergo reversible transnitrosation reactions at tris (pyrazolyl)boratozinc thiolates (iPr2)TpZn-SR. These zinc thiolates are unreactive toward anaerobic NO but rapidly react with NO in the presence of O-2 or anaerobically with NO2 to release the S-nitrosothiol RSNO with formation of the corresponding zinc nitrate.