Synthesis and Structure of New Water-Soluble Ag(I) and Pb(II) Complexes with Sulfonyl-Substituted Derivatives of the closo-Decaborate Anion

The reactivity of sulfonyl-substituted closo-decaborate derivatives (the [2-B10H9SH](2-) and [2-B10H9S(CH2C(?)NH2)(2)](-) anions) in the complexation of Ag(I) and Pb(II), Pearson soft acids, in the presence of competitive organic ligands has been studied. The substituted derivatives act as bridging ligands to form silver(I) binuclear complexes [(Ag(bipy)(2))(2)(2-B10H9SH)] and [(Ag(bipy)(2))(2)(2-B10H9S(CH2C(?)NH2)(2)]NO3; the [2-B10H9SH](2-) anion is involved in the lead(II) coordination polyhedron in the [Pb(2-B10H9SH)] and [Pb(bipy)(2)(2-B10H9SH)] complexes; in [Pb(bipy)(2)][2-B10H9S(CH2C(?)NH2)(2)](2), the substituted decaborate derivative acts as a counterion. The solubility of the mixed-ligand complexes is different due to the variety of their structures. The synthesized complexes are the first water-soluble lead and silver compounds with the closo-decaborate anion.