Metal chalcogenolate complexes have been known for a long time. Siemens¹  and Roemer²  reported mercury complexes, Hg(SeEt)₂ and Hg(SR)₂ as early as 1847 and 1873, respectively. During the last quarter of the 19th century and early 20th century thiolate complexes of several elements (e.g., Zn, Cd, Hg, Co, Rh, Pd, Bi) were synthesized.³  Over the last several decades the chemistry of metal thiolates has been extensively explored owing to the ease of their synthesis. These complexes find numerous applications in widely different areas like pharmaceuticals, structural models for metalloproteins, hydrodesulfurization reactions, etc. The chemistry of analogous selenolates and tellurolates, however, remained sluggish until the early 1990s.^4,5