Search

Abstract Magnetic exchange (ME), exchange-coupling constants J, hydrogen bonding parameter ‘d’ (H … O), ‘D’ (O … O), and Cu … Cu distance with their geometry and topology of copper complexes are utilized here to carry out the magneto-structural analysis in Cu-coordination complexes (retrieved by CSD) sustained by { … O–Cu–O–H} supramolecular synthons, in this study. The analysis reveals that most of the complexes are having the ‘J’ value with negative number, if H … O (d) and Cu … Cu distances are in the range of 1.2–2.4 Ǻ and 3.8–5.9 Ǻ, respectively. [ABSTRACT FROM AUTHOR]

A Zn(II)-based polyrotaxane 1D coordination polymer, {[Zn(Or)(Bimb)(H2O)]2·2H2O}n, 1 (Or = orotate; Bimb = 1,4-bis[(1H-imidazol-1-yl)methyl]benzene), has been synthesized. 1 provides for luminescent sensing of acetone, Fe3+, MnO4–, nitrofurantoin (NFT), uric acid (UA), and sucrose. The coordination polymer displays exceptional intensity quenching of ∼96.1% with 200 mg/dl of sucrose in aqueous solution. In addition, the reactivity of 1 to photocatalytically degrade the organic dye methylene blue (MB), a hazardous organic pigment, was established. 1 was able to degrade the dye due to the generation of reactive oxygen species. [ABSTRACT FROM AUTHOR]

A zinc-nicotinate complex has been prepared by direct reaction of zinc acetate and nicotinic acid in the presence of template tetramethylethylenediamine and is characterized by elemental analysis, FTIR, and TGA/DTA. The Zn complex was a precursor for the synthesis of ZnO nanoparticles. A correlation of the thermal and spectral properties of the precursor complex with its structure has been discussed. Thermolysis under air was studied by thermogravimetry, and the resulting ZnO product was characterized by XRD and TEM, showing compact particles with a diameter of about 17–50 nm. [ABSTRACT FROM AUTHOR]

AbstractA coordination polymer (CP) based on Co(II), {[Co(Ox)(H2O)3] · 2H2O}n (KA@CP2_ARS), has been synthesized using 1,3,5-tris[(1H-imidazol-1-yl)methyl]benzene (Timb) and potassium oxonate (OxK) at room temperature which was examined by single-crystal X-ray diffraction. KA@CP2_ARS contains a one-dimensional (1-D) helical chain that is extended through hydrogen-bonding interactions to form two-dimensional (2-D) and three-dimensional (3-D) supramolecular networks. KA@CP2_ARS demonstrates highly selective luminescent performance for IPA, Co2+, MnO4–, and uric acid with detection limits of 0.214, 0.16, 0.076, and 0.65 ppm, respectively, among the screened analytes. KA@CP2_ARS displays strong photocatalytic activities for degrading 88.6% of methyl violet dye under ultraviolet irradiation. [ABSTRACT FROM AUTHOR]

Hydrothermal reaction of cadmium iodide (CdI2) and 1,3-di(4-pyridyl)propane (dpp) results in the formation of the 2-D coordination polymer [Cd2(µ-ddp)4I4]n (1) where the Cd(II) ions assume octahedral I2N4 geometries. The dpp ligands adopt anti-anti (TT) and gauche-gauche′ (GG′) conformations. Thermogravimetric analysis reveals that 1 decomposes in two steps comprising dissociation of one dpp ligand followed by complete decomposition of the framework corresponding to the remaining three dpp ligands and iodides. Polymer 1 is luminescent at 386 nm. [ABSTRACT FROM AUTHOR]

Variable-temperature powder X-ray diffraction (VT-PXRD) and thermal stability were used to characterize the coordination polymer {[Cd(HBTC)(BPP)]·1.5DMF·2H2O}n (1). From the TGA analysis, as the complex shows stepwise desolvation, the polymer was activated at different specific temperatures to get various desolvated forms and their gas sorptions, as well as luminescence, were analyzed. Complex 1 exhibits strong fluorescent emission in the solid state with the main peak at 390 nm upon excitation at 340 nm. [ABSTRACT FROM AUTHOR]

Three new homoleptic complexes of nickel having the formula [Ni(L1)2] [L1 = C14H14N1O2S2-, N-(4-methoxybenzyl)(furfuryl)methane dithiocarbamate] (1), [Ni(L2)2] [L2 = C17H18N1O2S2-, N-bis(4-methoxybenzyl)methane dithiocarbamate] (2) and [Ni(L3)2] [L3 = C19H21N1O1S2-, N-(4-isopropylbenzyl)(4-methoxybenzyl)methane dithiocarbamate] (3), have been designed, synthesized, and characterized by elemental analysis, IR, 1H and 13C NMR and UV-visible absorption spectra showing that all complexes having analogous geometry and coordination number. The molecular structure of 2 is confirmed by single-crystal X-ray crystallography, which indicates that +2 charges on the metal ion (Ni2+) are balanced by dithiocarbamate anion. The X-ray analysis for 2 reveals a distorted square planar geometry around Ni2+ ion. Both C - H···S and intermolecular C-H···Ni interactions are the only artifact for the resulting Ni-dithiocarbamate architecture in 2. The electrical conductivity measurement between temperatures range of 303-393 K reflects that all complexes exhibit weak semiconducting behavior. Powder XRD, EDAX, and SEM spectra confirm the formation of NiS as thermal decomposition product in 1-3. The crystalline size of samples 1-3 was found to be 20.31 nm, 20.97 nm, and 20.39 nm, respectively. [ABSTRACT FROM AUTHOR]

Assembly of orotic acid (H3Or, 1,2,3,6-tetrahydro-2,6-dioxo-4-pyrimidinecarboxylic) and Cd(NO3)·6H2O yielded a coordination polymer, [(Cd(Hor)·2.5H2O)2]n (1), which has been characterized by X-ray single-crystal diffraction, TGA, and fluorescence spectra. Single-crystal X-ray structural analyses reveal that 1 is a hydrogen-bonded binuclear Cd-orotate coordination polymer in which both Cd2+ ions have different coordination environments with identical distorted octahedral geometry. Crystal data for 1: monoclinic, space group P21/n, a = 7.0209(10) Å, b = 13.974(2) Å, c = 17.541(3) Å, β = 98.842(2)°, V = 1700.5(4) Å, Z = 4, R1 = 0.0269, wR2 = 0.0612, θmax = 25.960. The emission spectrum of the Cd-complex recorded with 265 nm excitation wavelength reveals the complex has strong blue luminescence with the peak maximum 420 nm (2.95 eV) as a result of the n–π* and π–π* transitions on the H3Or ligand. [ABSTRACT FROM AUTHOR]