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 (H(2)pyzdc) in the presence of dihydroxyfumaric acid (DHFA) resulted in the formation of a highly stable 3D Cu(I) coordination polymer, {[Cu-2(pyzdc)]center dot 0.83H(2)O}(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.