Three Zn(ii)-based MOFs for luminescence sensing of Fe3+ and Cr2O72− ions

Abstract

Three zinc metal–organic frameworks (MOFs), {ZnL(chd)}_n (1), {[Zn(L)_0.5(oba)]·DMF·H₂O}_n (2) and {[Zn(L)_0.5(sdb)]·H₂O}_n (3) [L = E,E-2,5-dihexyloxy-1,4-bis-(2-pyridin-vinyl)-benzene; H₂chd = 1,4-cyclohexanedicarboxylic acid, H₂oba = 4,4′-oxybisbenzoic acid, H₂sdb = 4,4′-sulfonyldibenzoic acid], have been hydrothermally synthesized. We explored their applications in detecting ions, and the result shows that they all show highly selective sensing for Fe³⁺ and Cr₂O₇²⁻ ions.