Three metal induced 3D coordination polymers based on H3BTC and 1,3-BIP as co-ligands: Synthesis, structures and fluorescent properties

Abstract

Three new 3D coordination polymers, {[Co(BTC)2(H2O)2][Co(1,3-BIP)(H2O)4]2}n (1), {[Zn3(BTC)2(1,3-BIP)3]·2DMF}n (2) and {[Cu3(BTC)2(1,3-BIP)3]·DMA}n (3), were synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction, powder XRD, FT-IR, TGA and elemental analysis techniques. Although the three MCPs were constructed from the same tricarboxylate and N-donor ligands, their structures are quite different. Complex 1 features a 1D+2D→3D framework constructed by 2D [Co(BTC)2(H2O)2]n4n− layers and 1D [Co(1,3-BIP)(H2O)4]n2n+ chains, in which there exist three kinds of O–H⋯O hydrogen bonds, not only among the coordinated water molecules but also among the coordinated water molecules and carboxylate O atoms. Although complexes 2 and 3 have similar chemical formula, their structures are different. Complex 2 exhibits a 3D→3D twofold interpenetrating framework, while complex 3 shows an interesting 3D framework. Furthermore, the fluorescent properties of the complexes 1 and 2 were also investigated in the solid state at room temperature.