Formation Of Three-dimensional Supra-molecular Structure Research Articles

A Novel Tetranuclear Copper(I) Iodide Metal–Organic Cluster [Cu4I4(Ligand)5] with Highly Selective Luminescence Detection of Antibiotic

Antibiotics in wastewater are very harmful to the environment and human health; their effective detection is important but still challenging. Herein, the first copper(I) iodine-based antibiotic sensor [Cu4I4(EBT)5] (denoted as UJN-Cu, EBT = 3-ethyl-1,3-benzothiazole-2-thione) was prepared through a facile solvothermal synthesis method and structurally determined by single crystal X-ray diffraction. The molecular structure of UJN-Cu adopts a chair-like structure of [Cu4I4(Ligand)5], which is distinctly different from the reported cubane- or chair-like [Cu4I4(Ligand)4] tetranuclear configurations. Theoretical calculations indicate that the greenish yellow fluorescent emission of UJN-Cu arises from the charge transition between the [Cu4I4] core and EBT ligand. The hydrophobic EBT as a shell of the [Cu4I4] core and the formation of three-dimensional supramolecular structure are responsible for the excellent stability of UJN-Cu in various antibiotic aqueous solutions. UJN-Cu behaves as a sensitive luminescence...

Synthesis, structure and topological analysis of glycine templated highly stable cadmium sulfate framework: A New Lewis Acid catalyst

One new open-framework two-dimensional layer, [Cd(NH3CH2COO)(SO4)], I, has been synthesized using amino acid as templating agent. Single crystal structural analysis shows that the compound crystallizes in monoclinic cell with non-centrosymmetric space group P21, a = 4.9513(1) Å, b = 7.9763(2) Å, c = 8.0967(2) Å, β = 105.917(1)° and V = 307.504(12) Å3. The compound has connectivity between the Cd-centers and the sulfate units forming a two-dimensional layer structure. Sulfate unit is coordinated to metal center with η3, μ4 mode possessing a coordination free oxygen atom. The zwitterionic form of glycine molecule is present in the structure bridging with two metal centers through μ2-mode by carboxylate oxygens. The topological analysis reveals that the two-dimensional network is formed with a novel 4- and 6-connected binodal net of (32,42,52)(34,44,54,63) topology. Although one end of the glycine molecule is free from coordination, the structure is highly stable up to 350 °C. Strong N-H⋯ O hydrogen bonding interactions play an important role in the stabilization and formation of three-dimensional supramolecular structure. The cyanosilylation of imines using the present compounds as heterogeneous catalyst indicates good catalytic behavior. The present study illustrates the usefulness of the amino acid for the structure building in less studied sulfate based framework materials as well as designing of new heterogeneous catalysts for the broad application. The compound has also been characterized through elemental analysis, PXRD, IR, SEM and TG-DT studies.