The chemistry of chalcogenones – compounds containing a heavier chalcogen–carbon double bond, CE (E = S, Se or Te), i.e. a thione, selone, or tellone functional group – has been developed extensively over a number of years, e.g., chalcogenoketones,¹  chalcogenoamides,^2a,b  chalcogenoureas, and related N-substituted derivatives,^2a,b,3  as well as a number of other related classes of compounds,⁴  including the so-called “heavy ketones” – species with a double bond between tetrels (Si, Ge, or Sn) and chalcogens (S, Se, and Te).⁵  The chemistry of compounds with a heavier chalcogen–phosphorus double bond, PE (E = S, Se, or Te) was also developed considerably during recent years as revealed by several book chapters dedicated to this topic.⁶  Moreover, for most of these classes of compounds the coordination chemistry toward transition or main group metals was quite thoroughly investigated. In many cases excellent reviews are available, e.g., p- and d-block metal complexes with thio-, seleno-, or telluroureas and related heavy chalcogen–carbon multiple-bond compounds,^3b,c,7  metal complexes with species containing PE (E = S, Se, or Te) bonds,^6a,d  also emphasizing their potential as catalysts, precursors in materials chemistry, or compounds with biological activity.