Structural Diversity of Copper(II) Coordination Polymers Based on Tosylated Isophthalic Ligands

Two tosylated isophthalic ligands, namely, 5-tosyloxyisophthalic acid (H(2)toip) and 5-tosylamino-isophthalic acid (H(2)taip) were synthesized. Self-assembly of Cu-II ions with H(2)toip and H(2)taip ligands under different reaction conditions (temperature, solvents, and auxiliary ligands) gave rise to three coordination polymers formulated as [Cu(toip)(py)(2)](n) (1), [Cu-6(toip)(6)(H2O)(6)](n)center dot 8n(H2O) (2), and [Cu-6(taip)(6)(py)(4)(dmf)(2)](n)center dot n[(dmf)(6)(MeOH)(2)(H2O)(2)] (3) (py = pyridine, dmf = dimethylformamide). Compound 1 is a one-dimensional (1D) coordination polymeric chain. Compounds 2 and 3 are two-dimensional (2D) coordination networks featuring very similar Kagome lattices based on the interconnection of paddle-wheel [Cu-2(COO)(4)] secondary building units (SBUs) and toip(2-)/taip(2-) ligands. However, the arrangement of adjacent Kagome lattices in 2 and 3 are distinct, making them crystallize in different space groups and thereby have different crystal structures.