Cubane-like (COO−)2(H2O)6 anion water clusters: New building blocks of two trinodal supramolecular networks with mixed-connectivity

Abstract

Two unique discrete cubane-like (COO−)2(H2O)6 anion water clusters in the two solid phase have been observed for the fist time. The two water clusters are remarkably similar and both serve as the building blocks to construct two new 3D hydrogen-bonded architectures. {[Cd(PZA)2(H2O)4]·2H2O}n (1) features a rare (3,4,6)-connected trinodal network with 3,4,6T6 topology, and {[Mn(OPZA)2(H2O)4]·2H2O}n (2) displays a (4,5,6)-connected trinodal network bearing new topology. Moreover, compound 2 exhibits an interesting reversible crystal-to-amorphous transformation upon dehydration and rehydration, while 1 only exhibits crystal-to-crystal transformation during the dehydration.