Construction and Magnetic Difference of {CoCoM} (M = Co/Cd) Aggregates with Homo- and Heterometallic Centers Derived from {Co} Precursors.

Controllable synthesis of sophisticated aggregations has attracted wide attention from scientists. In this work, homo- and heterometallic {CoCoM} ( = Co/Cd) aggregates with similar skeletons, composed of two [CoM(dpbt)] peripheries and a central [Co(OH)] vertex-fused double-cubane, were constructed from prefabricated {Co} clusters and characterized by single-crystal X-ray diffraction and XPS, ICP-MS, SEM (EDX), and so on. And then, the structure and magnetic differences of them had been further analyzed under dotted with paramagnetic Co ions and/or diamagnetic Cd ions.

Double-stranded metallo-triangles: from anion-templated nonanuclear to cation-templated tetraicosanuclear dysprosium clusters.

Two double-stranded metallo-triangles, Dy9 and Dy24, with hexaple-CHPO bridges were constructed, and their magnetic properties were explored. Compared with the field-induced relaxation phenomenon of Dy9 templated with a chloride anion, Dy24 templated with a sodium cation exhibited zero-field single-molecule-magnet behavior.

Efficient Synthesis of Highly Crystalline One-Dimensional CrCl Atomic Chains with a Spin Glass State.

One-dimensional (1D) magnetic material systems have attracted widespread interest from researchers because of their peculiar physical properties and potential applications in spintronics devices. However, the synthesis of 1D magnetic atomic chains has seldom been investigated. Here, we developed an iodine-assisted vacuum chemical vapor-phase transport (I-VCVT) method, utilizing single-walled carbon nanotubes (SWCNTs) with 1D cavities as templates, and high-quality and high-efficiency fabrication of 1D atomic chains of CrCl was achieved.

Halogen Bond Mediated Self-Assembly of Mononuclear Lanthanide Complexes: Perception of Supramolecular Interactions, Slow Magnetic Relaxation, and Photoluminescence Properties.

Five new mononuclear lanthanide complexes, [LnL][EtNH]·THF/HO (Ln = Nd, Tb, Dy) (HL = 2-bis(2-hydroxy-3,5-dichloro benzyl)aminomethyl]pyridine), Ln = Nd (), Tb (), and Dy (), and (HL = 2-bis(2-hydroxy-3,5-dibromo benzyl)aminomethyl]pyridine), Ln = Nd (, HO) and Tb (), were synthesized and structurally characterized by single-crystal X-ray diffraction analyses. Being isostructural in all the five cases, the metal center is octa-coordinated with a triangular dodecahedron ( symmetry) geometry, and it is independent of the halogen substitution (Cl/Br). This close similarity is due to the composite interplay of hydrogen/halogen bond interactions that control the overall crystal packing, yet notable differences in association patterns among the individual ones arise from the subtle stereo-electronic requirement of individual molecules in the three-dimensional (3D) architecture.

Bioinformatic analysis of the gene expression profile in muscle atrophy after spinal cord injury.

Spinal cord injury (SCI) is often accompanied by muscle atrophy; however, its underlying mechanisms remain unclear. Here, the molecular mechanisms of muscle atrophy following SCI were investigated. The GSE45550 gene expression profile of control (before SCI) and experimental (14 days following SCI) groups, consisting of Sprague-Dawley rat soleus muscle (n = 6 per group), was downloaded from the Gene Expression Omnibus database, and then differentially expressed gene (DEG) identification and Gene Ontology, pathway, pathway network, and gene signal network analyses were performed.

Modulating the relaxation dynamics of the NaMn system an auxiliary anion change.

This paper reports two closely related heteropentanuclear manganese complexes, namely, {NaMn(opch)(μ-O)(μ-N) (μ-AcO)(μ-MeO)}·6CHOH·0.5HO (1) and {NaMn(opch)(μ-O)(μ-N)(μ-AcO)}·2.5CHOH·2HO (2), where Hopch is ()-'-(2-hydroxy-3-methoxybenzylidene)pyrazine-2-carbohydrazide.

Ring-forming transformation associated with hydrazone changes of hexadecanuclear dysprosium phosphonates.

{Dy16(μ6-C10H7PO3)2(μ5-C10H7PO3)8(spch)8(μ3-OH)2(μ2-OH)2(μ2-AcO)6(μ3-COO)2(DMF)2(H2O)6}·0.5CH3OH·4.5H2O (1) and {Dy16(μ5-C10H7PO3)4(μ3-C10H7PO3)12(μ2-C10H7PO3H)8(opch)4(DMF)8(MeOH)4}·2.

Investigating the effect of lanthanide radius and diamagnetic linkers on the framework of metallacrown complexes.

By changing the stoichiometric ratios, the one-pot reaction of the glycinehydroxamic acid (H2glyha) ligand with copper(ii) and lanthanide(iii) salts in the presence of diamagnetic [Na2{Fe(CN)5(NO)}] led to two series of isostructural complexes, which can be designated as heterotrimetallic dimeric clusters [{LnCu5(glyha)5}{Fe(CN)5(NO)}(H2O)4]2·xNO3·yH2O (x = 2, y = 11 for La (1), x = 2, y = 11 for Pr (2), and x = 2, y = 11 for Nd (3)) and heterotetrametallic coordination polymers [Na{LnCu5(glyha)5}{Fe(CN)5(NO)}2(H2O)x·yH2O]n (x = 6, y = 4 for Sm (4), x = 6, y = 0 for Gd (5), x = 6, y = 4 for Tb (6), x = 5, y = 5 Dy (7), and x = 6, y = 4 for Ho (8)). Each molecular structure contains LnIII[15-metallacrown-5] nodes and diamagnetic [Fe(CN)5(NO)]2- linkers. The resulting products demonstrate diversified structural frameworks due to the radius effect of LnIII ions and different bridging fashions of diamagnetic [Fe(CN)5(NO)]2- linkers.

Reversible ON-OFF switching of single-molecule-magnetism associated with single-crystal-to-single-crystal structural transformation of a decanuclear dysprosium phosphonate.

{Dy(EDDC)(μ-AcO)(μ-CHPO)(μ-CHPO)(μ-AcO)(AcO)(HO)(CHOH)}(μ-CO)·HO (), where HEDDC is ','',,','',',''-(ethane-1,2-diylidene)dipyrazine-2-carbohydrazide and CHPOH is 9-anthrylmethylphosphonic acid, is found to undergo two consecutive single-crystal-to-single-crystal transformations. The first is under UV irradiation ( = 365 nm for 3 d in air) to {Dy(EDDC)(μ-AcO)(μ-CHPO)(μ-AcO)(AcO)(HO)}(μ-CO)·HO () where the two CHOH are replaced by two HO and the second by annealing under N at 100 °C on a diffractometer or under Ar in a glovebox to {Dy(EDDC)(μ-AcO)(μ-CHPO)(μ-AcO)(HO)}(μ-CO) ( or ) where it has lost two HO molecules. The second transformation is reversible by exposure to air at room temperature ().

Consecutive one-/two-step relaxation transformations of single-molecule magnets via coupling dinuclear dysprosium compounds with chloride bridges.

The double chloride-bridged dimer of a dinuclear dysprosium(iii) single-molecule magnet (SMM) was successfully isolated by assembling centrosymmetric dinuclear Dy2 SMMs. Such structural transformation involves the generation and cleavage of chloride bridges and leads to consecutive transformations of one- and two-step slow relaxation of magnetization.

Exchange Interactions Switch Tunneling: A Comparative Experimental and Theoretical Study on Relaxation Dynamics by Targeted Metal Ion Replacement.

The magnetic relaxation and magnetization blocking barriers of tailor-made homo- and heterodinuclear compounds [Dy (opch) (OAc) (H O) ]⋅MeOH (1) and [DyMn(opch) (OAc)(MeOH)(H O) ] (2), where H opch is (E)-N'-(2-hydroxy-3-methoxybenzylidene)pyrazine-2-carbohydrazide, were systematically investigated and the change in single-molecule magnet behavior originating from targeted replacement of one dysprosium site in the Dy compound with manganese was elucidated through a combination of experimental and theoretical studies. A detailed comparative study on these closely related model compounds revealed remarkable changes of the crystal-field splitting and anisotropy of the Dy site and the total exchange spectrum due to the replacement of Dy by Mn. The blocking barriers of these two compounds, which explain their different relaxation behaviors, were analyzed.

Ultrathin LiCoO Nanosheets: An Efficient Water-Oxidation Catalyst.

Ultrathin cation-exchanged layered metal oxides are promising for many applications, while such substances are barely successfully synthesized to show several atomic layer thickness, owing to the strong electrostatic force between the adjacent layers. Herein, we took LiCoO, a prototype cation-exchanged layered metal oxide, as an example to study. By developing a simple synthetic route, we synthesized LiCoO nanosheets with 5-6 cobalt oxide layers, which are the thinnest ever reported.

Cyclic single-molecule magnets: from the odd-numbered heptanuclear to a dimer of heptanuclear dysprosium clusters.

A heptanuclear and a dimer of heptanuclear dysprosium clusters (Dy7 and Dy14) have been successfully synthesized by ingenious coalescence of the single and double pyrazinyl hydrazone as well as phosphonate ligands. The complexes feature the largest odd-numbered cyclic lanthanide clusters reported thus far. Both exhibit single molecule magnet behaviors at low temperature.

Enlarging the ring by incorporating a phosphonate coligand: from the cyclic hexanuclear to octanuclear dysprosium clusters.

Solvothermal reaction of a double pyrazinyl hydrazone ligand EDDC(2-) with Dy(OAc)3 results in a cyclic hexanuclear cluster [Dy6(EDDC)2(OAc)14(H2O)2]·MeOH·2H2O (). The addition of 1-naphthylphosphonate to the reaction mixture expands the ring size with the formation of a cyclic octanuclear cluster [Dy8(EDDC)4(O3PC10H7)4(OAc)8(H2O)4]·12H2O (). The latter shows slow magnetization relaxation below 12 K, characteristic of single molecule magnet behavior.

Differentiation of adipose-derived stem cells toward nucleus pulposus-like cells induced by hypoxia and a three-dimensional chitosan-alginate gel scaffold in vitro.

Background: Injectable three-dimensional (3D) scaffolds have the advantages of fluidity and moldability to fill irregular-shaped defects, simple incorporation of bioactive factors, and limited surgical invasiveness. Adipose-derived stem cells (ADSCs) are multipotent and can be differentiated toward nucleus pulposus (NP)-like cells. A hypoxic environment may be important for differentiation to NP-like cells because the intervertebral disc is an avascular tissue.

Butterfly-shaped pentanuclear dysprosium single-molecule magnets.

Two new "butterfly-shaped" pentanuclear dysprosium(III) clusters, [Dy5(μ3-OH)3(opch)6(H2O)3]⋅3 MeOH⋅9 H2O (1) and [Dy5(μ3-OH)3(Hopch)2(opch)4(MeOH)(H2O)2]⋅(ClO4)2⋅6 MeOH⋅4 H2O (2), which were based on the heterodonor-chelating ligand o-vanillin pyrazine acylhydrazone (H2opch), have been successfully synthesized by applying different reaction conditions. Single-crystal X-ray diffraction analysis revealed that the butterfly-shaped cores in both compounds were comparable. However, their magnetic properties were drastically different.

Quadruple-CO3(2-) bridged octanuclear dysprosium(III) compound showing single-molecule magnet behaviour.

A novel octanuclear dysprosium(III) compound, templated by quadruple μ(4)-CO(3)(2-) introduced via spontaneous fixation of atmospheric carbon dioxide, shows single-molecule-magnet behaviour with an obvious hysteresis loop detected by a traditional SQUID magnetometer.

Hexanuclear dysprosium(III) compound incorporating vertex- and edge-sharing Dy3 triangles exhibiting single-molecule-magnet behavior.

A unique hexanuclear dysprosium(III) compound with a new polydentate Schiff-base ligand shows complex slow relaxation of the magnetization most likely associated with the single-ion behavior of individual Dy(III) ions as well as the possible weak coupling between them.