Two chiral Zn(ii) metal–organic frameworks with dinuclear Zn2(COO)3 secondary building units: a 2-D (6,3) net and a 3-D 3-fold interpenetrating (3,5)-connected network

Abstract

The reaction of Zn(II) and 4,4′,4′′-(benzene-1,3,5-triyl-tris(benzene-4,1-diyl))-tribenzoic acid (H₃BBC) without or with the presence of 2-amino-1,4-benzenedicarboxylic acid (NH₂-H₂BDC) under solvothermal conditions leads to the generation of two novel Zn(II) coordination polymers, [Zn(BBC)(H₂O)₂](Me₂NH₂)·12DMF (1) and [Zn₂(BBC)(NH₂–BDC)](Me₂NH₂)·10DMF (2), which feature a 2D (6,3) net and a 3D three-fold interpenetrating (3,5)-connected network, respectively. The resulting crystals of 2 were not a racemic mixture but enantiomeric excess, which was confirmed by the measurement of optical rotation of bulk samples using the solid circular dichroism (CD) spectra based on large crystals from one crystallization. Two compounds exhibit strong photoluminescence in the solid state at room temperature.