Self-assembly of three cationic silver(I) coordination networks with flexible bis(pyrazolyl)-based linkers

Abstract

Three new cationic silver(I) coordination polymers, {[Ag(μ-bpmb)](SO3CF3)}n (1), {[Ag(μ-bdb)1.5](SO3CF3)}n (2) and {[Ag(μ-bpb)2](NO3)}n (3), with flexible 1,4-bis[(pyrazolyl)methyl]benzene (bpmb), 1,4-bis[(3,5-dimethylpyrazolyl)methyl]benzene (bdb), and 1,4-bis(pyrazolyl)butane (bpb) have been prepared at room temperature by the solvent layering method. The three compounds were characterized by FT-IR spectroscopy, PXRD, elemental analyses and single-crystal X-ray diffraction. Compound 1 is a highly undulated polymeric 1D chain in which the silver ions adopt a linear geometry, coordinating two bpmb linkers. Compounds 2 and 3 are both 2D coordination polymers with their silver atoms being three and four coordinated, and resulting in 63-hcb and 44-sql underlying net topologies, respectively. The flexible bispyrazolyl ligands display various conformations in the solid state, causing the formation of different Ag…Ag separations in the polymeric structures.