Highly rigid and stable porous Cu(i) metal-organic framework with reversible single-crystal-to-single-crystal structural transformation

A simple room temperature reaction of Cu(NO3)2, and 2,3-pyrazinedicarboxylic acid (H2pyzdc) in the presence of dihydroxyfumaric acid (DHFA) resulted in the formation of a highly stable 3D Cu(I) coordination polymer, {[Cu2(pyzdc)]·0.83H2O}n where DHFA acts as a reducing agent. It possesses a 1D water filled channel along the crystallographic c direction and the framework shows reversible single-crystal-to-single-crystal structural transformation upon dehydration and rehydration.