Supramolecular Isomerism, Framework Flexibility, Unsaturated Metal Center, and Porous Property of Ag(I)/Cu(I) 3,3‘,5,5‘-Tetrametyl-4,4‘-Bipyrazolate

Template-controlled reactions of 3,3‘,5,5‘-tetramethyl-4,4‘-bipyrazole (H2bpz) with [Ag(NH3)2]+
or [Cu(NH3)2]+ give binary metal bipyrazolates [M2(bpz)] (M = Ag, Cu) as two supramolecular isomers (1
and 2). Isomer 1 possesses four-fold interpenetrated (10,3)-a coordination networks, two-fold interpenetrated
(10,3)-a channel networks, and guest-accessible coordinatively unsaturated metal clusters. Isomer 2
possesses eight-fold interpenetrated (62·10)(6·102) coordination networks and isolated, small pores. These
metal bipyrazolates are chemically stable and thermally stable up to 300−500 °C. Their exceptional
framework flexibilities have been demonstrated by adsorption measurements and single-crystal diffraction
analyses. The guest-accessible Ag(I)/Cu(I) UMC clusters have also been demonstrated to facilitate the
accommodation of unsaturated hydrocarbons such as benzene, toluene, mesitylene, and acetylene via
weak metal···π interactions.