A mutually inclined interpenetrated cobalt benzenetricarboxylate/organodiimine layered coordination polymer containing “infinite” water chains and its irreversible crystal-to-crystal structural transformation upon dehydration

The novel coordination polymer {[Co(Hbtc)(4-bpmp)(H2O)] · 3H2O} (1, btc = 1,3,5-benzenetricarboxylate, 4-bpmp = N,N′-bis(4-pyridylmethyl)piperazine) has been prepared by hydrothermal synthesis and characterized by single crystal X-ray diffraction, IR and thermogravimetric analysis. Individual [Co(Hbtc)(4-bpmp)(H2O)]n layers mutually interpenetrate in a 2d + 2d → 3D inclined fashion to produce channels coursing down the c crystal direction, occupied by “infinite” 1D water molecule chains. Dehydration of 1 results in structural reorganization to a monoclinic phase, which is converted to an amorphous phase upon rehydration.