Catalyst 2 -designed as a molecular ammonia oxidation catalyst and equipped with a naphthyl binding groupshows the expected homogeneous phase catalytic activity for NH 3 oxidation in THF solution around its first oxidation potential (Figure ). A sample with HGC-bound 2 was then tested under the same conditions and also showed a clear onset of catalysis at the same potential as in solution (around -0.1 V vs. Fc/Fc + , Figure ).