Bunlawee Yotnoi

A New 1D Coordination Polymer of Lanthanum-Sulfate-1,10-Phenanthroline: Synthesis, Structure, and Photoluminescence Property

A 1D coordination framework, {[La2(o-phen)2(SO4)3(H2O)2]}n (1) (o-phen = 1,10-phenanthroline) was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, and UV-Vis spectroscopy. The crystal of 1 crystallized in the triclinic P,1. space group, a = 10.3228(5) Å, b = 12.3644(7) Å, c = 12.6579(6) Å, α = 72.323(2)°, β = 75.610(2)°, γ = 82.785(2)°, V = 1488.82(13) Å3, Z = 2. The structure exhibits a neutral 1D framework representing a five-connected uninodal 1-periodic net of (3,6)(0,2) topology. The framework structure comprises TPRS-9 {LaO7N2} units, chelating o-phen ligands and bridging sulfates of 3.1110 and 4.2211 coordination modes. These 1D chains are extended into a 3D supramolecular structure by hydrogen bonding interactions of, R22 (n) patterns. Thermogravimetric analysis shows the structure to be thermally stable up to approximately 400°C. Photoluminescence investigations on Eu3+ and Tb3+ doped samples suggest the competition between the ligand-to-metal charge-transfer and energy-transfer processes.

Tris(ethyl­enediamine)cobalt(II) sulfate

The structure of the title compound, [CoII(C2H8N2)3]SO4, the cobalt example of [M(C2H8N2)3]SO4, is reported. The Co and S atoms are located at the 2d and 2c Wyckoff sites (point symmetry 32), respectively. The Co atom is coordinated by six N atoms of three chelating ethylenediamine molecules generated from half of the ethylenediamine molecule in the asymmetric unit. The O atoms of the sulfate anion are disordered mostly over two crystallographic sites. The third disorder site of O (site symmetry 3) has a site occupancy approaching zero. The H atoms of the ethylenediamine molecules interact with the sulfate anions via intermolecular N—H⋯O hydrogen-bonding interactions.

Influence of secondary ligand on structures and topologies of lanthanide coordination polymers with 1,3,5-triazine-2,4,6-triamine hexaacetic acid

A series of new lanthanide coordination polymers has been synthesized and structurally characterized; [Ln4(TTHA)2(pzac)(H3O)2(H2O)]·5H2O (Ln = Pr (1a) and Nd (1b)), [Sm8(TTHA)4(pzac)0.5(H3O)(H2O)7.5]·4H2O (2), [Ln4(HTTHA)2(SO4)(H2O)4]·5H2O (Ln = Pr (3a) and Nd (3b)), where H6TTHA = 1,3,5-triazine-2,4,6-triamine hexaacetic acid, and H2pzac = 2,5-dioxo-piperazine-1,4-diacetic acid. The compounds feature 3-D frameworks comprising the deprotonated H6TTHA as the primary ligand and either the in situ generated pzac2− or sulfate as the secondary ligands. The influence of the deprotonated H6TTHA in directing the framework structures through preferential coordination modes and molecular conformation is described. The effect of the secondary ligands in increasing the compactness of the frameworks and in the alternation of the framework topologies based on the four-connected pts type is described. Graphical abstract

catena-Poly[[bis­(pyridine-κN)zinc]-μ-5-carb­oxy­benzene-1,3-di­carboxyl­ato-κ2O1:O3]

The title one-dimensional coordination polymer, [Zn(C9H4O6)(C5H5N)2]n or [Zn(HBTC)(py)2]n, (I), where BTC is benzene-1,3,5-tricarboxylate and py is pyridine, is a solvent-free polymorph of [Zn(HBTC)(py)2]·2C2H5OH [Yaghi et al. (1997 ▶). Chem. Mater. 9, 1074–1076]. Differences in the spatial arrangements and supramolecular packing of the [Zn(HBTC)(py)2]n chains in the two structures are described. The chain in (I) extends parallel to [100] and is severely puckered, with a Zn⋯Zn distance of 8.3599 (3) Å and a Zn⋯Zn⋯Zn angle of 107.516 (3)°, as a result of hydrogen-bonding interactions of the types O—H⋯O and C—H⋯O. There is no evidence for π–π interactions in (I). The differences between the solvent-free and solvent-containing structures can be accounted for by the absence of the ethanol solvent molecule and the use of the converging pair of O atoms in the bis-monodentate bridging HBTC2− ligand in (I).

(1-Butyl-1,4-diaza­bicyclo­[2.2.2]octon-1-ium-κN4)trichloridocobalt(II)

The title compound, [Co(C10H21N2)Cl3], was obtained as the by-product of the attempted synthesis of a cobalt sulfate framework using 1,4-diazabicyclo[2.2.2]octane as an organic template. The asymmetric unit comprises two distinct molecules, and in each, the cobalt(II) ions are tetrahedrally coordinated by three chloride anions and one 1-butyldiazabicyclo[2.2.2]octan-1-ium cation. The organic ligands are generated in situ, and exhibit two forms differentiated by the eclipsed and staggered conformations of the butyl groups. These molecules interact by way of C—H⋯Cl hydrogen bonds, forming a three-dimensional hydrogen-bonding array.

Inter­calated brucite-type layered cobalt(II) hydroxy­sulfate

In an attempt to synthesize new cobalt(II) sulfate framework structures using 1,4-diazabicyclo[2.2.2]octane as a template, crystals of poly[0.35-[hexaaquacobalt(II)] [tri-μ-hydroxido-μ-sulfato-dicobalt(II)]], {[Co(H2O)6]0.35[Co2(OH)3(SO4)]}n, were obtained as a mixture with [Co(H2O)6]SO4 crystals. The crystal structure can be described as being constructed from discrete brucite-type [Co4(OH)6(SO4)2] layers, each of which is built up from edge-shared [Co(OH)6] and [Co(OH)4(OSO3)2] octahedra, with partial intercalation by [Co(H2O)6]2+ ions. The absence of ca 30% of the [Co(H2O)6]2+ cations indicates partial oxidation of cobalt(II) to cobalt(III) within the layer.