N→As intramolecularly coordinated organoarsenic(III) chalcogenides: Isolation of terminal As–S and As–Se bonds

Unprecedented NCN – intramolecularly chelated organoarsenic(III) sulfide and selenide LAsE (where L = [2,6-(Me2NCH2)2C6H3]− and E = S (2) or Se (3)) were prepared by the reaction of the parent chloride LAsCl2 (1) with Li2E. Analogously, the reaction of NC chelated compound L′AsCl2 (4) (where L′ = [2-(2′,6′-i-Pr2C6H3)NCH)C6H4]−) with Li2S gave the corresponding sulfide L′AsS (5). The molecular structures of 3 and 4 were established in the solid state using X-ray diffraction technique.

We have demonstrated that both NCN and NC chelating ligand are good candidates for preparation of molecular organoarsenic(III) sulfides and selenides. Using stabilizing capability of the NCN chelating ligand allowed isolation of unprecedented terminal AsS and AsSe bonds.Figure optionsDownload as PowerPoint slideHighlights
► The syntheses of NCN and NC chelated arsenic(III) sulfides and selenide is described.
► The unprecedented monomeric structure with terminal As–S and As–Se bonds was established for NCN chelated compounds.
► The monomeric structure of these compounds is retained even in solution.