Three Zn(<scp>ii</scp>)-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 Cr₂O₇^2- ions.