Three sulfur-containing diborane(4) compounds

The preparation and structures of three diborane(4) compounds ape described. The compound B-2(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 [B-2(C3S5)(2)(NHMe2)(2)] [2,2'-bis(dimethylamino)-2,2'-bi(1,3,4,6,2-tetrathiaborapentalene-5-thione), C10H14B2N2S10] and [B-2(1,2-S2C2H4)(2)(NHMe2)(2)]. 0.33CH(2)Cl(2) [1,2-bis(dimethylamino)-1,1:2,2-bis(dimethylenedithioxy)diborane(4) dichloromethane solvate, C8H22B2N2S4. 0.33CH(2)Cl(2)] 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.