Electrochemistry and spectro-electrochemistry of dithizonatophenylmercury(II)

► CV and spectroelectrochemistry of dithizone and PhHgHDz, 3, is presented. ► CV shows 3 has stable metal thioether (Hg-S-C), 1 oxidation and two reductions. ► 3 is photochromic (t1/2, relaxation = 1300 s). ► Electrochemistry of ground and photo-activated 3 is identical. ► Spectroelectrochemistry of 3 highlights electrochromism.