Solvent-regulated assembly of three new polymeric CdII 5-fluoroisophthalates with mono-, di-, and trinuclear nodes: Syntheses, structures, and luminescent properties

Three new polymeric CdII complexes, [Cd(fip)(MeOH)3]n (1), {[Cd2(fip)2(H2O)5]·4H2O}n (2), and {[Cd3(fip)4(H2O)2][Cd(DMF)2(H2O)4]·2DMF}n (3), have been prepared from the reactions of CdII acetate with a rigid fluorinated ligand 5-fluoroisophthalic acid (H2fip) under different solvent systems. Complex 1 shows a 1D zigzag coordination chain with a mononuclear [Cd(COO)(MeOH)3] unit, and complex 2 displays a 2D neutral layered structure containing a dinuclear [Cd2(COO)4(H2O)5] entity, while complex 3 presents a 2D anionic coordination network with the linear trinuclear [Cd3(COO)8(H2O)2] clusters as the linking nodes. The results clearly suggest that the judicious choice of solvent systems does play a critical role in the construction of coordination frameworks with distinct connectivity and dimensionality. The spectroscopic, thermal, and luminescent properties of 1–3 have also been investigated.