Rare metal-ion metathesis of a tetrahedral Zn(II) core of a noncentrosymmetric (3,4)-connected 3D MOF

An SHG-active noncentrosymmetric (3,4)-connected Zn(II)–organic framework, {[Zn2(4-abpt)(3,4-pydc)2]·2DMAc·3MeOH·H2O}n (1-Zn), was synthesized using a mixed-ligand system. The 1-Zn framework undergoes metal metathesis, with the complete exchange of the tetrahedrally coordinated ZnII ions with CuII ions while retaining the integrity of the network.