New powerful reagents based on dihalogen/N,N′-dimethylperhydrodiazepine-2,3-dithione adducts for gold dissolution: the IBr case

摘要: The synthesis, X-ray structure [monoclinic, P21/n, a = 12.1690(1), b = 7.8360(1), c = 14.4250(1) A, β = 113.808(2)°], spectroscopic and electrochemical characterization of a new powerful reagent based on the iodine monobromide adduct N,N′-dimethylperhydrodiazepine-2,3-dithione (Me2dazdt) ligand, able to oxidize gold metal in one-step reaction under mild conditions, is reported. dissolution has been performed powder, wires Au/Ti thin layers. oxidation product isolated structurally characterised as [Au(Me2dazdt)Br2]IBr2 C2/c, 26.523(8), 10.191(6), 14.549(7) A, 111.57(2)°]. essentially within square planar geometry, Me2dazdt acts an S,S chelating ligand two bromide ligands complete geometry around metal. IBr2− counteranion linear shows I–Br bond lengths slightly asymmetric [Br(4)–I(1) 2.742(3), Br(3)–I(1) 2.682(2) A]. A comparison with removal from Si/SiO2/Au/Ti layers comparable thickness that found microelectronic devices, by using THF solutions IBr I2 adducts donor, well currently used I2/I− aqueous solutions, these dihalogens-adducts produce quantitative shorter times leaving underlying layer perfectly clean, are thus highly desirable etching agents gold-based technology semiconductor devices.