Experimental and Theoretical Insights on Gas Trapping of Noble Gases in MFU-4-Type Metal-Organic Frameworks.

Isostructural metal-organic frameworks (MOFs), namely MFU-4 and MFU-4-Br, in which the pore apertures are defined by anionic side ligands (Cl and Br, respectively), were synthesized and loaded with noble gases. By selecting the type of side ligand, one can fine-tune the pore aperture size, allowing for precise regulation of the entry and release of gas guests. In this study, we conducted experiments to examine gas loading and release using krypton and xenon as model gases, and we complemented our findings with computational modeling.

An Anthracene-Based Metal-Organic Framework for Selective Photo-Reduction of Carbon Dioxide to Formic Acid Coupled with Water Oxidation.

A Zr-based metal-organic framework has been synthesized and employed as a catalyst for photochemical carbon dioxide reduction coupled with water oxidation. The catalyst shows significant carbon dioxide reduction property with concomitant water oxidation. The catalyst has broad visible light as well as UV light absorption property, which is further confirmed from electronic absorption spectroscopy.

Cooperative Large-Hysteresis Spin-Crossover Transition in the Iron(II) Triazolate [Fe(ta)] Metal-Organic Framework.

The metal-organic framework [Fe(ta)] (Hta = 1-1,2,3-triazole) containing Fe(II) ions and 1,2,3-triazolate ligands shows a reversible phase transition while retaining the cubic crystal symmetry and space group 3 (no. 227). The phase transition between room temperature (RT-[Fe(ta)]; = 16.

CFA-15 - a perfluorinated metal-organic framework with linear 1-D Cu-chains containing accessible unsaturated, reactive metal centres.

The synthesis and crystal structure of the perfluorinated metal-organic framework CFA-15 (Coordination Framework Augsburg University-15), CuII3(tfpc)2(OH)2·DMF, as well as the crystal structure of its ligand (H2-tfpc = 3,5-bis(trifluoromethyl)-1H-pyrazole-4-carboxylic acid) are described. The MOF crystallizes in the monoclinic crystal system within the chiral space group C2 (no. 5).

CFA-14 - a perfluorinated metal-organic framework with linear 1-D Co-chains showing temperature dependent spin-chain magnetic ordering.

The synthesis and crystal structure of the perfluorinated metal-organic framework (MOF) CFA-14 (Coordination Framework Augsburg University-14), CoII2(tfpb)(OH)2 (H2-tfpb = 1,4-bis(3,5-bis(trifluoromethyl)-1H-pyrazole-4-yl)benzene) are described. The cobalt-containing MOF crystallizes in the tetragonal crystal system within the space group I41/acd (no. 142) and the unit cell parameters are as follows: a = 20.

Synthesis and characterization of a flexible metal organic framework generated from Mn and the 4,4'-bipyrazolate-ligand.

The synthesis and crystal structure of a novel metal organic framework, constructed from MnIII, the 4,4'-bipyrazolate (BPZ) ligand and bridging hydroxyl groups is presented in this work. The network topology is identical to M-CFA-6 (M = Fe, Ga), but in the case of Mn-CFA-6, the structure crystallizes in the monoclinic crystal system due to the Jahn-Teller effect of the high spin d4 manganese(iii) centers. Thermal treatment of Mn-CFA-6 leads to decomposition of the framework above 150 °C.

CFA-13 - a bifunctional perfluorinated metal-organic framework featuring active Cu(i) and Cu(ii) sites.

The synthesis and crystal structure of the mixed-valent perfluorinated metal-organic framework (MeNH)[CFA-13] (Coordination Framework Augsburg University-13), (MeNH)[CuCu(tfpc)] (H-tfpc = 3,5-bis(trifluoromethyl)-1H-pyrazole-4-carboxylic acid) is described. The copper-containing MOF crystallizes in the monoclinic crystal system within the space group P2/n (no. 14) and the unit cell parameters are as follows: a = 22.

Single-Crystal to Single-Crystal Transformation of a Nonporous Fe(II) Metal-Organic Framework into a Porous Metal-Organic Framework via a Solid-State Reaction.

We report the synthesis of an air-stable nonporous coordination compound based on iron(II) centers, formate anions, and a 4,4'-bipyrazole (HBPZ) ligand. Upon thermal treatment, a porous metal-organic framework (MOF) formed due to decomposition of the incorporated formate anions. This decomposition step and the following structural changes constituted a single-crystal to single-crystal transformation.

Bistriazole-p-benzoquinone and its alkali salts: electrochemical behaviour in aqueous alkaline solutions.

Quinones are well known as redox-active compounds. In this work bistriazole-p-benzoquinone was prepared and its electrochemical behaviour in aqueous alkaline solutions was studied by cyclic voltammetry. Two successive one-electron reduction steps were observed - the first step was reversible and the second quasireversible.

CFA-4 - a fluorinated metal-organic framework with exchangeable interchannel cations.

The syntheses and crystal structures of the fluorinated linker 1,4-bis(3,5-bis(trifluoromethyl)-1H-pyrazole-4-yl)benzene (H-tfpb; 1) and the novel metal-organic framework family M[CFA-4] (Coordination Framework Augsburg University-4), M[Cu(tfpb)] (M = Cu(i), K, Cs, Ca(0.5)), are described. The ligand 1 is fully characterized by single crystal X-ray diffraction, photoluminescence-, NMR-, IR spectroscopy, and mass spectrometry.

One-pot synthesis of ultrastable pentanuclear alkylzinc complexes.

Two organometallic pentanuclear zinc complexes, namely [ZnEt(Mebta)] and [ZnMe(Mebta)], containing tridentate N-donor ligands (5,6-dimethylbenzotriazolate, Mebta) were prepared by a one-pot synthesis. These compounds represent the first examples of organometallic complexes featuring a Kuratowski-type bond topology. Zinc ions were introduced as organometallic precursors (either diethylzinc or dimethylzinc was used), which upon mixing with the ligand yielded the desired complexes spontaneously.

A structurally flexible triazolate-based metal-organic framework featuring coordinatively unsaturated copper(i) sites.

The novel metal-organic framework CFA-8 (Coordination Framework Augsburg University-8), [Cu2(tqpt)], containing the organic linker H2-tqpt {H2-tqpt = 6,6,14,14-tetramethyl-6,14-dihydroquinoxalino[2,3-b]phenazinebis-triazole}, has been synthesized. Reaction of H2-tqpt and anhydrous CuCl2 in N,N-dimethylacetamide (DMA) yields CFA-8 as orange crystals with lenticular shape. This framework shows a reversible breathing effect and is robust upon solvent removal.

CFA-7: an interpenetrated metal-organic framework of the MFU-4 family.

The novel interpenetrated metal-organic framework CFA-7 (Coordination Framework Augsburg University-7), [Zn5Cl4(tqpt)3], has been synthesized containing the organic linker {H2-tqpt = 6,6,14,14-tetramethyl-6,14-dihydroquinoxalino[2,3-b]phenazinebistriazole}. Reaction of H2-tqpt and anhydrous ZnCl2 in N,N-dimethylformamide (DMF) yields CFA-7 as pseudo-cubic crystals. CFA-7 serves as precursor for the synthesis of isostructural frameworks with redox-active metal centers, which is demonstrated by postsynthetic metal exchange of Zn(2+) by different M(2+) (M = Co, Ni, Cu) ions.

Coordination frameworks assembled from Cu(II) ions and H₂-1,3-bdpb ligands: X-ray and magneto structural investigations, and catalytic activity in the aerobic oxidation of tetralin.

The syntheses and crystal structures of H2-1,3-bdpb·MeOH, [Cu(II)2(1,3-bdpb)(OCH3)2] (CFA-5) and [Cu(I)Cl(H2-1,3-bdpb)] (H2-1,3-bdpb = 1,3-bis(3,5-dimethyl-1H-pyrazol-4-yl)benzene) are described. The copper(II) containing metal-organic framework (termed Coordination Framework Augsburg University-5, CFA-5) crystallizes in the trigonal crystal system, within the space group R3̄ (no. 148) and the unit cell parameters are as follows: a = 26.

Chain-terminating and clickable NAD⁺ analogues for labeling the target proteins of ADP-ribosyltransferases.

ADP-ribosyltransferases (ARTs) use NAD(+) as a substrate and play important roles in numerous biological processes, such as the DNA damage response and cell cycle regulation, by transferring multiple ADP-ribose units onto target proteins to form poly(ADP-ribose) (PAR) chains of variable sizes. Efforts to identify direct targets of PARylation, as well as the specific ADP-ribose acceptor sites, must all tackle the complexity of PAR. Herein, we report new NAD(+) analogues that are efficiently processed by wild-type ARTs and lead to chain termination owing to a lack of the required hydroxy group, thereby significantly reducing the complexity of the protein modification.

Tribenzotriquinacene receptors for C60 fullerene rotors: towards C3 symmetrical chiral stators for unidirectionally operating nanoratchets.

The synthesis of a stereochemically pure concave tribenzotriquinacene receptor (7) for C60 fullerene, possessing C3 point group symmetry, by threefold condensation of C2 -symmetric 1,2-diketone synthons (5) and a hexaaminotribenzotriquinacene core (6) is described. The chiral diketone was synthesized in a five-step reaction sequence starting from C2h -symmetric 2,6-di-tert-butylanthracene. The highly diastereo-discriminating Diels-Alder reaction of 2,6-di-tert-butylanthracene with fumaric acid di(-)menthyl ester, catalyzed by aluminium chloride, is the relevant stereochemistry introducing step.

Scorpionate-type coordination in MFU-4l metal-organic frameworks: small-molecule binding and activation upon the thermally activated formation of open metal sites.

Postsynthetic metal and ligand exchange is a versatile approach towards functionalized MFU-4l frameworks. Upon thermal treatment of MFU-4l formates, coordinatively strongly unsaturated metal centers, such as zinc(II) hydride or copper(I) species, are generated selectively. Cu(I)-MFU-4l prepared in this way was stable under ambient conditions and showed fully reversible chemisorption of small molecules, such as O2, N2, and H2, with corresponding isosteric heats of adsorption of 53, 42, and 32 kJ mol(-1), respectively, as determined by gas-sorption measurements and confirmed by DFT calculations.

[The conversion of hypothyroidism into hyperthyroidism during leflunomide with povidone iodine treatment of rheumatoid arthritis].

Till now there has not been reported data related to the influence of leflunomide on the thyroid gland function of the treated person. The authors described the case of woman with rheumathoid arthritis and hypothyroidism who revealed hyperthyroidism in 7 months after starting leflunomide tablets treatment containing povidone iodine as well. Also both autonomical tissue area in thyroid right lobe and hight TSHRAb level were found.

CFA-1: the first chiral metal-organic framework containing Kuratowski-type secondary building units.

The novel homochiral metal-organic framework CFA-1 (Coordination Framework Augsburg-1), [Zn5(OAc)4(bibta)3], containing the achiral linker {H2-bibta = 1H,1'H-5,5'-bibenzo[d][1,2,3]triazole}, has been synthesised. The reaction of H2-bibta and Zn(OAc)2·2H2O in N-methylformamide (NMF) (90 °C, 3 d) yields CFA-1 as trigonal prismatic single crystals. CFA-1 serves as a convenient precursor for the synthesis of isostructural frameworks with redox-active metal centres, which is demonstrated by the postsynthetic exchange of Zn(2+) by Co(2+) ions.

CFA-2 and CFA-3 (Coordination Framework Augsburg University-2 and -3); novel MOFs assembled from trinuclear Cu(I)/Ag(I) secondary building units and 3,3',5,5'-tetraphenyl-bipyrazolate ligands.

The syntheses of H2-phbpz, [Cu2(phbpz)]·2DEF·MeOH (CFA-2) and [Ag2(phbpz)] (CFA-3) (H2-phbpz = 3,3',5,5'-tetraphenyl-1H,1'H-4,4'-bipyrazole) compounds and their crystal structures are described. The Cu(I) containing metal-organic framework CFA-2 crystallizes in the tetragonal crystal system, within space group I4(1)/a (no. 88) and the following unit cell parameters: a = 30.

Enhanced selectivity of CO(2) over CH(4) in sulphonate-, carboxylate- and iodo-functionalized UiO-66 frameworks.

Three new functionalized UiO-66-X (X = -SO(3)H, 1; -CO(2)H, 2; -I; 3) frameworks incorporating BDC-X (BDC: 1,4-benzenedicarboxylate) linkers have been synthesized by a solvothermal method using conventional electric heating. The as-synthesized (AS) as well as the thermally activated compounds were characterized by X-ray powder diffraction (XRPD), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, thermogravimetric (TG), and elemental analysis. The occluded H(2)BDC-X molecules can be removed by exchange with polar solvent molecules followed by thermal treatment under vacuum leading to the empty-pore forms of the title compounds.

Screening to detect carbohydrate disturbances in welfare home residents in Rzeszów.

Introduction: To screen for undiagnosed type 2 diabetes and other disturbances of the glucose metabolism in welfare home residents in Rzeszów.

Material And Methods: 478 residents of four randomly selected welfare homes in Rzeszów were initially enrolled in the study. Among them were 66 residents with previously diagnosed diabetes.

New V(IV)-based metal-organic framework having framework flexibility and high CO2 adsorption capacity.

A vanadium based metal-organic framework (MOF), VO(BPDC) (BPDC(2-) = biphenyl-4,4'-dicarboxylate), adopting an expanded MIL-47 structure type, has been synthesized via solvothermal and microwave methods. Its structural and gas/vapor sorption properties have been studied. This compound displays a distinct breathing effect toward certain adsorptives at workable temperatures.

CuN6 Jahn-Teller centers in coordination frameworks comprising fully condensed Kuratowski-type secondary building units: phase transitions and magneto-structural correlations.

The metal-organic framework [Cu(ta)(2)] (Hta = 1H-1,2,3-triazole), containing Jahn-Teller active Cu(II) ions and 1,2,3-triazolate ligands, is prepared under solvothermal reaction conditions. The compound shows a reversible phase transition from the tetragonal crystal system (α-[Cu(ta)(2)]: space group I4(1)/amd (no. 141), a = 11.

Reversible gas-phase redox processes catalyzed by Co-exchanged MFU-4l(arge).

Postsynthetic metal ion exchange in a benzotriazolate-based MFU-4l(arge) framework leads to a Co(II)-containing framework with open metal sites showing reversible gas-phase oxidation properties.