Syntheses, Structures, and Magnetic Properties of Two Gadolinium(III)-Copper(II) Coordination Polymers by a Hydrothermal Reaction This work is supported by the NNSF of China, the NSF of Fujian Province, and the Key Project from the CAS

Ultrahigh-Uptake Capacity-Enabled Gas Separation and Fruit Preservation by a New Single-Walled Nickel-Organic Framework

High gas-uptake capacity is desirable for many reasons such as gas storage and sequestration. Moreover, ultrahigh capacity can enable a practical separation process by mitigating the selectivity factor that sometimes compromises separation efficiency. Herein, a single-walled nickel-organic framework with an exceptionally high gas capture capability is reported. For example, C2H4 and C2H6 uptake capacities are at record-setting levels of 224 and 289 cm3 g-1 at 273 K and 1 bar (169 and 110 cm3 g-1 at 298 K and 1 bar), respectively. Such ultrahigh capacities for both gases give rise to an excellent separation performance, as shown for C2H6/C2H4 with breakthrough times of 100, 60 and 30 min at 273, 283 and 298 K and under 1 atm. This new material is also shown to readily remove ethylene released from fruits, and once again, its ultrahigh capacity plays a key role in the extraordinary length of time achieved in the preservation of the fruit freshness.

A Biocompatible GdIII–Organic Framework Incorporating Polar Pores for pH-Sensitive Anti-Cancer Drug Delivery and Inhibiting Human Bone Tumour Cells

With the aim of developing new and effective drug delivery systems for cancer treatments, great effort has been devoted to the field of porous metal–organic framework (MOF) platforms because of their controlled drug release performance, high drug loading, and acceptable biocompatibility. In this contribution, we report a MOF [Gd2(H2O)3(SDBA)3](DMA)3] (1, DMA=N,N-dimethylacetamide) with open O donor sites functionalised 1D pores, which has been fabricated using a bent polycarboxylic acid organic linker 4,4′-sulfonyldibenzoic acid (H2SDBA) under solvothermal conditions. Single crystal X-ray diffraction (SCRD), thermogravimetric analysis (TGA), elemental analysis, X-ray powder diffraction (XPRD), and Brunauer–Emmett–Teller (BET) analysis were used to characterise the as-prepared complex 1. 5-Fluorouracil (5-Fu) loaded 1 was soaked in phosphate buffer saline (PBS) and the invitro drug release performance was monitored by HPLC analysis under different pH conditions. At the pH values of 7.4 and 6.5, different profiles of pH-responsive release were achieved, indicating that the drug release performance of 5-Fu loaded 1 is pH sensitive. Grand Canonical Monte Carlo (GCMC) simulation results demonstrate that the open O donor sites in the framework of 1 account for the slower drug release rate. The prepared carrier is found to be bio-compatible with MG63 cells (cancerous tissue) and oral epidermal cells (normal tissue), when tested by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The 5-Fu loaded carrier also shows a promising growth inhibition effect towards the human bone tumour cells MG63.

Syntheses, structures, and properties of a series of novel high-nuclear 3d–4f clusters with mixed amino acids as ligands: {Ln6Cu24}(Ln = Gd, Tb, Pr and Sm)

The first examples of high-nuclear 3d–4f heterometallic clusters {Ln₆Cu₂₄}(Ln = Gd, Tb, Pr and Sm) with mixed amino acid ligands are reported.

A novel two-dimensional cobalt(II) complex composed of one-dimensional twisted pair-like chains: poly[[tetraaquabis(μ3-pyridine-2,5-dicarboxylato-κ(4)N,O(2):O(5):O(5'))dicobalt(II)] dihydrate]

A novel neutral polymer, {[Co2(C7H3NO4)2(H2O)4]·2H2O}n, was hydrothermally synthesized using pyridine-2,5-dicarboxylate (2,5-PDC(2-)) as the organic linker. It features a two-dimensional layer structure constructed from one-dimensional {[Co(2,5-PDC)2](2-)}n chains interlinked by [Co(H2O)4](+) units. The two Co(II) cations occupy special positions, sitting on inversion centres. Each 2,5-PDC(2-) anion chelates to one Co(II) cation via the pyridine N atom and an O atom of the adjacent carboxylate group, and links to two other Co(II) cations in a bridging mode via the O atoms of the other carboxylate group. In this way, the 2,5-PDC(2-) ligand connects three neighbouring Co(II) centres to form a two-dimensional network. The two-dimensional undulating layers are linked by extensive hydrogen bonds to form a three-dimensional supramolecular structure, with the uncoordinated solvent molecules occupying the interlamellar region.

A one-dimensional cadmium metal-organic chain based on a [Cd4(COO)4] secondary building unit and a flexible dicarboxylic acid ligand

An infinite one-dimensional cadmium metal-organic chain, namely catena-poly[aquabis(μ3-2,2'-{[1,2-phenylenebis(methylene)]bis(sulfanediyl)}dibenzoato)dicadmium(II)], [Cd2(C22H16O4S2)2(H2O)]n, was synthesized by solvothermal reaction of Cd(NO3)2·4H2O and 2,2'-{[1,2-phenylenebis(methylene)]bis(sulfanediyl)}dibenzoic acid (H2L). The Cd(II) centres have six-coordinate CdS2O4 and CdSO5 geometries. Due to the flexible -CH2-S- arms, the L(2-) ligand adopts both syn and anti conformations. Four Cd(II) cations are linked by two syn L(2-) ligands to form a centrosymmetric planar tetranuclear Cd(II) core, which is further extended through bonding to the anti L(2-) ligands to form a one-dimensional metal-organic chain. Adjacent one-dimensional chains are connected by C-H···π interactions and nonclassical C-H···O hydrogen bonds to form the resultant three-dimensional supramolecular framework.

Poly[[tetra-aqua-tetra-kis-[μ3-5-(pyridine-4-carboxamido)-isophthalato]nickel(II)diterbium(III)] tetra-hydrate]

In the title compound, {[NiTb₂(C₁₄H₈N₂O₅)₄(H₂O)₄]·4H₂O}_n, the Tb^III ion is coordinated by one water mol­ecule and seven O atoms from four 5-(pyridine-4-carboxamido)­isophthalate (L) ligands in a distorted square-anti­prismatic arrangement, while the Ni^II ion, lying on an inversion center, is six-coordinated in an octa­hedral geometry by two pyridine N atoms, two carboxyl­ate O atoms and two water mol­ecules. One L ligand bridges two Tb^III ions and one Ni^II ion through two carboxyl­ate groups and one pyridine N atom. The other L ligand bridges two Tb^III ions and one Ni^II ion through two carboxyl­ate groups, while the uncoordinating pyridine N atom is hydrogen bonded to an adjacent coordinating water mol­ecule. Extensive O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds play an important role in stabilizing the crystal structure.

Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study

The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studies. The presence of hydrated and coordinated water molecules is inferred from thermogravimetric analysis. Thermal degradation studies show that the final product is the metal oxide. The luminescence properties of the Nd(III) and Er(III) complexes in dimethylformamide (DMF) solutions were investigated.

Poly[[tetra-aqua-tetra-kis-[μ(3)-5-(pyridine-4-carboxamido)-isophthalato]cobalt(II)dierbium(III)] tetra-hydrate]

In the centrosymmetric polymeric title compound, {[CoEr₂(C₁₄H₈N₂O₅)₄(H₂O)₄]·4H₂O}_n, the Er^III cation has a coordination number of eight and is surrounded by seven carboxyl­ate O atoms from four 5-(pyridine-4-carboxamido)­isophthalate (L) ligands and one water mol­ecule, forming a distorted square-anti­prismatic arrangement. The Co^II cation is located on an inversion center and is coordinated by two pyridine N atoms, two carboxyl­ate O atoms and two water mol­ecules in a distorted octa­hedral geometry. The asymmetric unit contains two anionic L ligands. One bridges two Er^III cations and one Co^II cation through two carboxyl­ate groups and one pyridine N atom, while the other bridges two Er^III cations and one Co^II cation through two carboxyl­ate groups. Extensive O—H⋯O, O—H⋯N and N—H⋯O hydrogen-bonding inter­actions are present in the crystal, involving all uncoordinated water mol­ecules and the uncoordinated pyridine N atom of one of the ligands bonded to an adjacent coordinated water mol­ecule. The title compound is isotypic with the gadolinium analogue.

Poly[[tetra-aqua-tetra-kis-[μ(3)-5-(pyridine-4-carboxamido)-isophthalato]-cobalt(II)-diholmium(III)] tetra-hydrate]

In the centrosymmetric polymeric title compound, {[CoHo₂(C₁₄H₈N₂O₅)₄(H₂O)₄]·4H₂O}_n, the Ho^III ion is coordinated by one water mol­ecule and four 5-(pyridine-4-carboxamido)­isophthalate (L) ligands in a distorted square-anti­prismatic arrangement. The Co^II ion, located on an inversion center, is coordinated by two pyridine N atoms, two carboxyl­ate O atoms and two water mol­ecules in a distorted octa­hedral geometry. One L ligand bridges two Ho ions and one Co ion through two carboxyl­ate groups and one pyridine N atom. The other L ligand bridges two Ho ions and one Co ion through two carboxyl­ate groups, while the uncoordinated pyridine N atom accepts a hydrogen bond from an adjacent coordinated water mol­ecule. Extensive O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonding is present in the crystal.