A series of coordination networks constructed from the rigid ligand 4,4 %26apos;-ethynylenedibenzoate: topological diversity, entanglement, supramolecular interactions and photophysical properties

作者：Martins V; Resende J A L C; Ronconi C M

来源：CrystEngComm, 2017, 19(23): 3103-3116.

DOI：10.1039/c7ce00306d

Four coordination networks (CNs), i.e., [Co(edb)(H2O)(Py)(2)], 3; [Cd(edb)(DMSO)(2)]center dot 0.5(DMSO), 4; [Er-2(edb)(3)(DMSO)(2)(H2O)(2)], 5; and [Gd-2(edb)(3)(H2O)(4)], 6 (edb(2-)= 4,4'-ethynylenedibenzoate), were synthesized and structurally characterized, and the luminescence properties of CNs 4 and 5 were investigated. In CN 3, the ligand adopts a bridging coordination mode that connects one Co.II) ion to another, resulting in a 1D CN. CNs 4 and 5 contain binuclear centers that are linked to four ligands in the chelating and bridging coordination modes. CN 4 has a 2D -> 3D inclined polycatenated structure, whereas CN 5 exhibits a 3D network because the voids created by the long ligand are stabilized by the pi-pi stacking interactions, thereby avoiding the entanglement of the structure. CN 6 has a paddle-wheel structure with a two-fold interpenetrated rob topology. The photophysical properties of the compound H(2)edb and CNs 4 and 5 were studied in the solid state. Compound 2 (H(2)edb) displays strong absorption bands at 325 and 350 nm and emission at 385 nm. Upon complexation with Er(III), the emission was quenched. The emissions of CN 4 were due to the intraligand transitions.

• 出版日期2017-6-21