Syntheses, Structures, and Gas Adsorption Properties of Two Novel Cadmium–Sodium Organic Frameworks with 1,3,5-Benzenetricarboxylate Ligands

Solvothermal reactions of Cd(CH3COO)(2)center dot 2H(2)O and NaOH with 1,3,5-benzenetricarboxylic acid (H3BTC) in a mixture of H2O/DMA (DMA = N,N'-dimethylacetamide) gave rise to two novel 3D porous metal-organic frameworks (MOFs), [Cd3Na6(BTC)(4)(H2O)(12)]center dot H2O (I) and [Cd3Na2(BTC)(3)(H2O)(3)]center dot[H2N(CH3)(2)]center dot H2O (2), which were characterized by single crystal and variable temperature powder X-ray diffraction (VTPXRD), IR spectroscopy, elemental analyses, inductively coupled plasma measurements, and coupled thermogravimetric-mass spectrometric analyses. Compound 1 crystallizes in the tetragonal space group P4(2)/n and could be described as a 2-fold interpenetrated net having a boracite (bor) topology, bridged by {Na3O12} trirners. Compound 2 crystallizes in the monoclinic space group Cc with ID channels distributed in an unusual honeycomb fashion along the b-axis. {Na2O10} dimers, (CH3)(2)NH2+ ions, and guest water are located in these channels. TG-MS and VTPXRD studies revealed that 1 had a high thermal stability up to 340 degrees C under air, and 2 was stable up to 310 degrees C. The gas-adsorption investigation disclosed that compound 1 exhibited H-2 uptake of 1.11 wt % at 77 K and 1.0 bar, with a high adsorption heat (8.4 kJ mol(-1)).Chemistry, MultidisciplinaryCrystallographyMaterials Science, MultidisciplinarySCI(E)0ARTICLE83529-35351

Effects of Xenobiotic Compounds on Preeclampsia and Potential Mechanisms

Preeclampsia (PE) refers to a disease with new hypertension and albuminuria or other end-organ damage after 20 weeks of pregnancy. As a major complication of pregnancy, PE can increase the morbidity and mortality of pregnant women and fetuses and cause serious social burden. Recently, it has been found that exposure to xenobiotic compounds, especially endocrine disruptors in the environment, may contribute to the development of PE. However, the underlying mechanism is still unclear. It is generally believed that PE is related to placental dysplasia, spiral artery remodelling failure, oxidative stress, etc. Therefore, in order to better prevent the occurrence of PE and reduce the damage and impact on mother and fetus, this paper reviews the role and potential mechanism of PE induced by exogenous chemicals and provides an outlook on the environmental etiology of PE

Synthesis, structure and magnetic property of a new nickel (II) 1,4-benzenedicarboxylate

Ni-2(H2O)(en)(2)(BDC)(2) (1) (en = ethylenediamine, BDC = 1,4-benzenedicarboxylate), has been synthesized hydrothermally. 1 Crystallizes in orthorhombic space group Fddd with a = 10.623(2) angstrom, b = 21.104(4) angstrom, and c = 42.829(9) angstrom. is constructed from stacked neutral layers, [Ni-2(H2O)(en)(2)(BDC)(2)](n). Ni ions in the structure coordinate to four oxygen atoms and two nitrogen atoms to form NiO4N2 octahedra and two NiO4N2 octahedra connect to each other with a common oxygen atom to form a Ni2O7N4 dimer. Magnetic measurement shows that the dominant magnetic exchange interactions of 1 are ferromagnetic in origin. TG-DSC studies show that 1 is stable up to 300 degrees C. (C) 2011 Elsevier B.V. All rights reserved.Chemistry, PhysicalSCI(E)0ARTICLE184-189101

Syntheses, Structures, and Structural Transformations of Mixed Na(I) and Zn(II) Metal–Organic Frameworks with 1,3,5-Benzenetricarboxylate Ligands

Three new compounds, [ZnNa(BTC)(H2O)(2)]center dot H2O (1), [Zn3Na2(BTC)(2)(HCOO)(2)(H2O)(8)] (2), and [Zn3Na(BTC)(2) (HCOO)(H2O)3]center dot H2O (3) (H3BTC = 1,3,5-benzenetricarboxylate acid), were synthesized under hydrothermal conditions and were characterized by the single crystal and powder X-ray diffraction, IR spectra, elemental analyses, ICP measurements, and coupled TG-MS analyses. 1, 2, and 3 crystallize in the space groups P (1) over bar, C2/c, and P1, respectively. They are three-dimensional (3D) frameworks, consisting of zigzag chains ((Na2Zn2O14)(n) for 1, (Na2Zn3O18)(n) for 2, or (NaZn3O14)(n) for 3) and bridging BTC ligands. Powder X-ray diffraction studies reveal that 1 and 2 exhibit reversible dehydration-rehydration behaviors with a crystal-to-crystal transformation observed for 2.Chemistry, MultidisciplinaryCrystallographyMaterials Science, MultidisciplinarySCI(E)9ARTICLE62243-22491

Structural and magnetic properties of tetragonal perovskite BaFe1-xBixO3-[small delta]

A series of BaFe1-xBixO3-delta (0.09 <= x <= 0.35) has been synthesized by a traditional solid state method. They all crystallize in space group P4/mmm (with a = 4.0759(1) angstrom, c = 4.0782(1) angstrom for x = 0.15) confirmed by the combinational use of powder X-ray, synchrotron, neutron, and electron diffractions. The magnetic susceptibility measurements show that the antiferromagnetic transition for these materials occurs from 64 to 50 K.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348987700047&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Chemistry, MultidisciplinarySCI(E)[email protected]

CCDC 810695: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures

Seroconversion of hepatitis B surface antigen among those with previously successful immune response in Southern China

Recommendations promoted worldwide have suggested a period of protection lasting more than 20 years against hepatitis B (HB) following primary immunization. Starting in 1987, universal HB vaccinations were carried out in Long An County, Guangxi Province, one of the earliest counties in which plasma-derived HB vaccine was delivered to newborns across China. Data collection targeted toward understanding the long term (26–33 years since primary immunization) immune effects of the plasma-derived HB vaccine was conducted in 2015; a second data collection was carried out in 2019 to assess seroconversion in the same cohort. This study qualitatively compared positive vs negative results and quantitatively assessed HB biomarkers – HB surface antigen (HBsAg), antibody to HBsAg (anti-HBs), HB e-antigen (HBeAg), antibody to HBeAg (anti-HBe), and antibody to HB core antigen (anti-HBc) – in serum 26–33 years after the full initial course of HB vaccination, then analyzed anti-HBs seroconversion using the two-phase sampling method in the same cohort and calculated the anti-HBs seroconversion rate from 2015 to 2019. The protective sero-conversion rate (anti-HBs ≥10mIU/mL) was 37.6% (192/511); the HBsAg-positive rate was 5.3% (27/511); the anti-HBs mean geometric titer (GMT) was 11.1 mIU/mL. Among the 143 participants involved in both 2015 and 2019 data collections, the seroconversion rate was 3.5% (5/143); two individuals had protective anti-HBs levels in 2015. These findings indicate that anti-HBs status can be seroconverted to a protective concentration level 4 years earlier in a high HBV epidemic region. The role of genomic mutations and the disappearance of immune memory and seroconversion should be investigated