Silver(I) coordination polymers ligated by bipyrazole Me4bpzH2: Structures, properties, and catalytic carbon dioxide incorporation into propargyl alcohol

3,3′,5,5′-Tetramethyl-4,4′-bipyrazole ligand (Me 4 bpzH 2 ) has been used to generate new silver(I) hexafluorophosphate and silver(I) hexafluoroantimonate coordination polymers viz. {[Ag(Me 4 bpzH 2 )](PF 6 )} n and {[Ag(Me 4 bpzH 2 )](SbF 6 )(CH 3 OH) 0.5 } n . The two nitrogen atoms of Me 4 bpzH 2 coordinate silver(I) ions in {[Ag(Me 4 bpzH 2 )](PF 6 )} n and {[Ag(Me 4 bpzH 2 )](SbF 6 )(CH 3 OH) 0.5 } n in a linear arrangement to form zig-zag coordination polymers that were investigated as heterogenous catalysts for the addition of carbon dioxide to propargyl alcohols. Solid-state characterizations of these coordination polymers were performed by IR and far-IR spectroscopy. The yield of the resulting cyclic carbonates was influenced by the bulk of the substrate, the polarity of the reaction solvents, and the amount and strength of the base, with lower solvent polarity and higher amounts of stronger bases resulting in a higher TON (turnover number).