Synthesis and structural characterization of new weakly coordinating anions. Crystal structure of Ag(1-CH 3–CB 11H 5X 6) (X=H, Cl, Br, I)

Abstract

New weakly coordinating anions 1-CH 3–CB 11H 5X 6 − (X=Cl, Br, I) have been prepared in high yield by either C-methylation of hexahalocarborane anions CB 11H 6X 6 − or direct halogenation of 1-CH 3–CB 11H 11 −. The lithiation of CB 11H 6X 6 − works just as well as that of the parent anion CB 11H 12 −, which offers a convenient method for the preparation of C-alkylated carborane anions of the type 1-R–CB 11H 5X 6 −. The useful silver(I) reagents of these new anions not only showed increased solubility in various organic solvents but also demonstrated the subtlety and diversity of their solid state structures. They are all one-dimensional coordination polymers in the solid state. The coordination details are, however, unique to each structure.