Synthesis, structure, and characterization of two 1-D homometallic coordination polymers based on carboxylate-functionlized salen ligands

<div><p>Two 1-D homometallic coordination polymers <b>1</b> and <b>2</b> have been prepared by one-step hydrothermal reactions of carboxylate-functionalized salen ligands with Co(II) and Mn(II), respectively. Single-crystal X-ray diffraction analyses reveal that both the 1-D chains give 3-D supramolecular structures through intermolecular hydrogen bonds and <i>π</i><i>π</i> packing interactions. Magnetic investigation of <b>2</b> indicates the presence of antiferromagnetic interactions in 1-D chains.</p></div

A TiO₂@{Mo₃₆₈} composite: synthesis, characterization, and application in dye-sensitized solar cells

<div><p>The high-nuclear cluster compound Na₄₈[H_xMo₃₆₈O₁₀₃₂(H₂O)₂₄₀(SO₄)₄₈]·ca.1000H₂O (denoted as {Mo₃₆₈}) represents the known nanoscale hedgehog-type cluster anion with the diameter of approximately 6 nm. Herein, a TiO₂@{Mo₃₆₈} composite was prepared through a sol–gel process for the first time. SEM, XPS, and UV–vis spectra were employed to characterize their chemical composition and structures. Meanwhile, the as-obtained composite was further mixed with P25 (Degussa P25 titania photocatalyst) then applied as the photoanodes of dye-sensitized solar cells (DSSCs); the results showed that DSSCs with the P25-TiO₂@{Mo₃₆₈}-based photoanodes exhibited better performance than that with pure P25-based photoanodes, which was due to less carrier recombination and longer electron lifetime in the former DSSCs by the results from analysis of dark current measurement, electrochemical impedance spectroscopy, and open-circuit voltage decay curve.</p></div

A Series of [MnMo₉O₃₂]^6– Based Solids: Homochiral Transferred from Adjacent Polyoxoanions to One-, Two-, and Three-Dimensional Frameworks

Five new compounds based on the Waugh-type polyoxoanion [MnMo₉O₃₂]^6– Na₄Mn­[MnMo₉O₃₂]·11.5H₂O (<b>1</b>), KNa₃Mn­[MnMo₉O₃₂]·9H₂O (<b>2</b>), Na₂Ni₂[MnMo₉O₃₂]·12H₂O (<b>3</b>), l-Mn₃[MnMo₉O₃₂]·13H₂O (<b>4a</b>), d-Mn₃[MnMo₉O₃₂]·13H₂O (<b>4b</b>), and l-Ni₃[MnMo₉O₃₂]·11.5H₂O (<b>5a</b>) have been synthesized. In these compounds, with the changes of Na⁺/TM (TM = Mn²⁺, Ni²⁺) in the crystal, the homochiral interactions were extended from two adjacent [MnMo₉O₃₂]^6– to one-dimensional (compounds <b>1</b> and <b>2</b>), two-dimensional (compound <b>3</b>), and three-dimensional (compounds <b>4</b> and <b>5</b>) systems, respectively

Two pillared-helical-layer frameworks based on spiral chainlike metavanadate and [M(btx)]²⁺ complexes

<div><p>Two new isomorphous oxovanadium composite solids, [Zn(btx)V₂O₆] (<b>1</b>) and [Cu(btx)V₂O₆] (<b>2</b>) (btx = 1,4-bis(triazol-1-ylmethyl)benzene), have been synthesized and characterized by elemental analysis, IR, TGA, and single-crystal X-ray diffraction. The structures of <b>1</b> and <b>2</b> are composed of {MV₂O₆} (M = Zn or Cu) bimetallic oxide layers, linked through {MO₂N₂} building blocks and btx ligands into 3-D architectures. The two compounds consist of infinite spiral chains and all helical chains are meso-helices, which lead to racemic solid-state compounds. The electrochemical properties of the two compounds have been studied.</p></div

A Novel Carboxyethyltin Functionalized Sandwich-type Germanotungstate: Synthesis, Crystal Structure, Photosensitivity, and Application in Dye-Sensitized Solar Cells

A novel sandwich-type germanotungstate [C­(NH₂)₃]₁₀[Mn₂{Sn­(CH₂)₂COOH}₂(B-α-GeW₉O₃₄)₂]·8H₂O (<b>1</b>) represents the first single crystalline polyoxometalate (POM) functionalized by open chain carboxyethyltin, which was designed and synthesized in aqueous solution and applied to a dye-sensitized solar cell (DSSC) for the first time. Its photosensitivity was explored through a fluorescence spectrum (FL), surface photovoltage spectrum (SPV), electrochemical method, and solid diffuse spectrum. <b>1</b> displays the primary features of sensitizers in DSSCs, and the efficiency of the solar cell is 0.22%. Delightedly, when <b>1</b> was employed to assemble a cosensitized solar cell configuration by preparing a <b>1</b>-doped TiO₂ electrode and additionally adsorbing N719 dyes, a considerably improved efficiency was achieved through increasing spectral absorption and accelerating electron transport, which is 19.4% higher than that of single N719 sensitization. This result opens up a new way to position different dyes on a single TiO₂ film for cosensitization

El trabajo experimental con nuevas tecnologías

En la actualidad no es concebible un enfoque de los cursos de ciencias para cualquiera de los niveles de la enseñanza que no tenga presente la realización de trabajos prácticos. En todos los currículos se hace referencia a su necesidad y lo único que suele variar es su enfoque y los medios materiales con los que se cuenta

Polyoxometalate-Supported 3d–4f Heterometallic Single-Molecule Magnets

The reactions of [CuTbL_Schiff(H₂O)₃Cl₂]Cl complexes with A- or B-type Anderson polyoxoanions lead to new polyoxometalate-supported 3d–4f heterometallic systems with single-molecule-magnet behavior

Broad-Spectrum Antiviral Property of Polyoxometalate Localized on a Cell Surface

Cs₂K₄Na­[SiW₉Nb₃O₄₀] has broad antiviral ability including anti-Influenza A, -Influenza B, -HSV-1, -HSV-2, -HIV-1, and -HBV. A series of antivirus and/or biochemical experiments and X-ray nanotomography analysis confirm that this kind of broad-spectrum antiviral property is mainly due to its localization on the cell surface