Three sulfur-containing diborane(4) compounds

Abstract

The preparation and structures of three diborane(4) compounds are described. The compound B2(3,4-S2C4H2-1-S)2 [2,2′-bi(1,3,5,2-tri­thia­borapentalene), C8H4B2S6] is planar and lies at a crystallographic inversion centre. The amine adducts [B2(C3S5)2(NHMe2)2] [2,2′-bis­(di­methyl­amino)-2,2′-bi(1,3,4,6,2-tetra­thia­borapentalene-5-thione), C10H14B2N2S10] and [B2(1,2-S2C2H4)2(NHMe2)2]·0.33CH2Cl2 [1,2-bis­(di-methylamino)-1,1:2,2-bis(dimethylenedithioxy)diborane(4) di­chloro­methane solvate, C8H22B2N2S4·0.33CH2Cl2] contain di­methyl­amine ligands bound to each boron in an anti conformation about the B—B bond, with tetrahedral geometry at the B atoms. The crystal structures display a number of S⋯S interactions, which appear to dictate the packing arrangements.