1D Tube, 2D Layer, and 3D Framework Derived from a New Series of Metal(II)−5-Aminodiacetic Isophthalate Coordination Polymers

Three novel coordination polymers, [Cu2(adip)(H2O)4]n·nH2O (1), [Co3(Hadip)2(H2O)6]n·2nH2O (2), and [Zn7(adip)4(H2O)10K2(H2O)2]n·4nH2O (3), were solvothermally synthesized by adopting a new type of multicarboxylate ligand, H4adip (H4adip
= 5-aminodiacetic isophthalic acid). Compound 1 features a 1D tube-like structure, compound 2 shows novel 2D (3,4)-connected
nets, and compound 3 possesses an interesting 3D architecture, all of which possess channels hosting guest water molecules. A
particular interest of the adip4- ligand is its propensity to bind metal ions forming various metallocycles, which could be viewed as
the basic building blocks in the construction of supramolecular frameworks. Thermogravimetric analyses (TGA) were performed on
compounds 1, 2, and 3. Variable-temperature magnetic susceptibility of 2 was investigated. An intense blue luminescence with an
emission band peaking at 454 nm observed for 3 may result from ligand-to-metal charge transfer (LMCT).