Dynamic coordination polymers with 4,4′-oxybis(benzoate):: Reversible transformations of nano- and nonporous coordination frameworks responding to present solvents

Reversible construction of a nanoporous framework from a nonporous framework has been found in the zinc(II) coordination polymer with 4,4'-oxybis(benzoate) (oba). [Zn-2(oba)(2)(dmf)(2)](.)2DMF (1), which has 1 nm scale channels, transforms to the nonporous coordination polymer [Zn(oba)(H2O)] (2) with the loss of the open framework. Compound 2 on treatment with DMF reversibly yields nanoporous compound 1.