New insights into the aggregation of silver pyrazolides using sterically hindered bidentate pyrazole ligands

Abstract

Recrystallisation of Ag[L¹] (HL¹ = 3{5}-[pyrid-2-yl]-5{3}-tert-butylpyrazole) in the presence of halide anions leads to two polymorphs of [Ag₃(μ-Br)(μ-L¹)₂], which differ in their mode of supramolecular association, and the cluster [Ag₁₀(μ-L¹)₈]Cl₂. In contrast, Ag[L²] (HL² = 3{5}-[isoquinol-1-yl]-5{3}-tert-butyl-pyrazole) crystallises as a cyclic tetrameric molecule.