A Silver(I) Coordination Polymer with Sodium 3,5-Dimethyl-4-Sulfonate Pyrazolate: a Nice Example of PXRD Structure Solution and Time-Driven Crystallization

Silver(I) coordination polymer with the sodium salt of 3,5-dimethyl-4-sulfonate pyrazole (HLNa) has been prepared and structurally characterized by ab initio X-ray Powder Diffraction. The presence of the SO3Na substituent in position 4- of the pyrazole ring led to a 3D polymeric species in which organometallic/inorganic layers alternate along b. Zig-zag chains of linear coordinated Ag(I) ions keep togheter the inorganic layers, which consist of a trapezoidal grid of Na-ions interconnected by bridging sulfonates and bridging water molecules which are both disordered about a mirror plane. Interestingly, the disordered moieties slowly reorganize in a time-driven crystallization process as observed on aged, 1-year old, samples.