Abstract Regioselective photodimerization of trans ‐4‐styrylpyridine (4‐spy) derivatives is performed using pseudorotaxane‐like Zn‐based metal organic frameworks MOFs as templates. The formation rctt ‐HT (head‐to‐tail) dimers achieved by confining pairs coordinated 4‐spy derivative ligands within hexagonal windows and then irradiating them with UV light. It also possible to achieve a reaction where two different substituted are included in such MOF material. ether bond employed protect the...

To obtain a pure product without the isomer byproducts is goal that many chemists are pursuing. As one kind of very important synthesis method, photochemical reaction simple and straightforward yet low-selective. In this work, coordination interaction-based oriented strategy has been proposed to realize precise stereochemical control isomeric cyclic compounds in photocycloaddition reaction. Through fixing reactants via interactions, arrangements configurations can be adjusted, thereby...

is a precious traditional Chinese medicine with high medicinal and ornamental value. However, the characterization of its mitochondrial genome still pending. Here, we assembled complete

Abstract Regioselective photodimerization of trans ‐4‐styrylpyridine (4‐spy) derivatives is performed using pseudorotaxane‐like Zn‐based metal organic frameworks MOFs as templates. The formation rctt ‐HT (head‐to‐tail) dimers achieved by confining pairs coordinated 4‐spy derivative ligands within hexagonal windows and then irradiating them with UV light. It also possible to achieve a reaction where two different substituted are included in such MOF material. ether bond employed protect the...

Five cobalt(II) complexes based on 1H-indazole-3-carboxylic acid (H2L), [Co(phen)(HL)2]·2H2O (1), [Co(5,5′-dimethyl-2,2′-bipy)(HL)2] (2), [Co(2,2′-bipy)2(HL)2]·5H2O (3), [Co2(2,9-dimethyl-1,10-phen)2(L)2] (4) and [Co2(6,6′-dimethyl-2,2′-bipy)2(L)2]·H2O (5) (2,2'-bipy = 2,2′-bipyridine, phen 1,10-phenanthroline), have been synthesized structurally characterized by elemental analyses, IR UV-vis spectroscopies single-crystal X-ray crystallography. The results indicate that 1–3 possess...

Improving drought tolerance of psammophytes is a challenge for vegetation restoration in arid lands. Despite extensive reports on the effect arbuscular mycorrhizal fungi (AMF) plant resistance, its enhancements resistance from different successions stages have been rarely explored. Here, seedlings Artemisia wudanica (early succession), Hedysarum fruticosum (middle and Caragana korshinskii (late succession) were selected to investigate AMF growth successional stages. We found that...

The high cost and elemental scarcity of precious metals has triggered a search for non-noble-metal catalysts the oxygen evolution reaction (OER) process. Herein, with assistance metal organic frameworks (MOFs), core/shell ZnCo2O4/ZnO nanoarray an amorphous carbon protecting layer, grown on fiber, was in situ topologically generated. resulting catalyst shows much enhanced OER performance under alkaline condition, requiring as low 279 mV overpotential to reach 10 mA cm-2 current density. Our...

In this Letter, ultrashort blue pulses spanning 350-500 nm are generated by combining the broadband frequency doubling technology with two-stage multiplate continuum (MPC) generation scheme. We prepare relatively input and use a configuration for MPC generation, allowing us to employ thinner less solid plates further spectral broadening. Therefore, deteriorations of phase, energy conversion efficiency, beam quality, which occur more easily 400 pulses, effectively suppressed. After fine...

A multiple-crystal optical parametric amplification (OPA) design is reported for efficiently generating few-cycle 1.9-μm laser pulses. Different spectral regions of the idler pulse are successively amplified in three nonlinear crystals with delicately adjusted phase-matching angles, and a broadband spectrum supporting three-cycle transform-limited (TL) duration obtained. Near-TL 21.5 fs realized by simple compression silicon window. Owing to sufficient exploitation pump energy crystals,...

In this work, 85 µJ, 5.5 fs pulses spanning 350-500 nm with 96% energy concentrated on the main pulse are generated by compression using a helium-assisted, two-stage solid thin plate apparatus. To best of our knowledge, these highest sub-6 blue obtained to date. Furthermore, during spectral broadening process, we observe that plates much more easily damaged in vacuum than gas-filled environment at same field intensity. Helium, ionization and extremely low material dispersion, is adopted...

The purpose of this study was to analyze the influencing factors frailty in elderly patients with type II diabetes. 332 diabetes admitted our hospital from May 2018 December 2019 were selected as subjects. degree evaluated by Fried fragility phenotype scale, and general information clinical data collected inquiry questionnaire survey. After that, all analyzed SPSS 20.0. Univariate analysis showed that there significant differences age, medication types, dietary habits, exercise tolerance,...

In the title compound, C11H10ClN3O2, dihedral angle between two rings is 5.6°. The crystal structure stabilized by O—H⋯O hydrogen bonds.

Fungal diversity is threatened by climate change, land-use and environmental pollution, requires urgent conservation action.Construction of the fungal species database an important prerequisite for study diversity.Recently developed DNA barcoding metabarcoding technologies can provide accurate, rapid, highly efficient identification on a large scale, to extent compensate defects traditional methods.In this paper, we review application in assessment, mechanisms underlying diversity,...