High-Polarity Fluoroalkyl Ether Electrolyte Enables Solvation-Free Li Transfer for High-Rate Lithium Metal Batteries.

Lithium metal batteries (LMBs) have aroused extensive interest in the field of energy storage owing to the ultrahigh anode capacity. However, strong solvation of Li and slow interfacial ion transfer associated with conventional electrolytes limit their long-cycle and high-rate capabilities. Herein an electrolyte system based on fluoroalkyl ether 2,2,2-trifluoroethyl-1,1,2,3,3,3-hexafluoropropyl ether (THE) and ether electrolytes is designed to effectively upgrade the long-cycle and high-rate performances of LMBs.

Controllably Enriched Oxygen Vacancies through Polymer Assistance in Titanium Pyrophosphate as a Super Anode for Na/K-Ion Batteries.

Although sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are promising prospects for next-generation energy storage devices, their low capacities and inferior kinetics hinder their further application. Among various phosphate-based polyanion materials, titanium pyrophosphate (TiPO) possesses outstanding ion transferability and electrochemical stability. However, it has rarely been adopted as an anode for SIBs/PIBs due to its poor electronic conductivity and nonreversible phase transitions.

[Study on the coumarin glucosides of Angelica dahurica].

Objective: To study the coumarin glucosides of Angelica dahurica.

Methods: Fresh roots and rhizomes of Angelica dahurica were extracted with ethanol at room temperature. Repeated column chromatography and preparative HPLC were used to isolate and purify the compounds.

[Studies on the chemical constituents of Salicornia europaea].

Objective: To study the chemical constituents of Salicornia europaea.

Methods: The chemical constituents were isolated and purified by means of several chromatographic techniques and their structures were elucidated by spectroscopic methods.

Results: Five compounds were isolated and identified as syringaresinol 4-O-beta-D-glucopyranoside(1), icariside B2(2), erythro-1-(4-O-beta-D-glucopyranosyl-3,5-dimethyoxyphenyl)-2-syringaresinoxyl-propane-1,3-diol(3), longifloroside B(4), 7-O-beta-D-glucopyranosyl-6-methoxychromone(5).

[Study on the chemical constituents from the bulbs of Zephyranthes candida].

Objective: To study the chemical constituents from the bulbs of Zephyranthes candida.

Methods: The chemical constituents were separated and purified by means of several chromatographies and their structures were elucidated by spectroscopic methods.

Results: Six compounds were isolated and identified as trisphaeridine (I), p-hydroxybenzaldehyde (II), sucrose (III), (-)-amarbellisine (IV), lycorine (V), (+)-haemanthamine (VI).

[Studies on the chemical constituents of the aerial part of Bupleurum chinense (II)].

Objective: To study the chemical constituents of the aerial part of Bupleurum chinense.

Methods: Dried aerial parts of Bupleurum chinense were extracted with EtOH, the chemical constituents in the extract were isolated and their structures were identified by physical and chemical properties and spectral analysis.

Results: Five compounds were obtained and identified as 1-O-caffeoylglycerol (1), esculetin (2), scopoletin (3), kaempferol-3-O-beta-D-rutinoside (4) and alpha-spinastero (5).

[Studies on chemical constituents from Zephyranthes candida].

Objective: To study on the chemical constituents of Zephyranthes candida.

Methods: Compounds were isolated and repeatedly purified by chromatographic techniques on silica gel column. Their structures were elucidated by chemical and spectral methods.

[Studies on the chemical constituents of Lonicera macranthoides].

Objective: To study the chemical constituents of flower buds of Lonicera macranthoides.

Methods: The 90% EtOH extract of Lonicera macranthoides. was successively partitioned with petroleum ether and ethyl acetete.

Two novel ceramides with a phytosphingolipid and a tertiary amide structure from Zephyranthes candida.

Two novel ceramides, Candidamide A (1) with a phytosphingolipid structure, and Candidamide B (2) with a tertiary amide structure, together with 12 known compounds (3-14) have been isolated from the bulbs of Zephyranthes candida, The structures of 1 and 2 have been elucidated to be 1,3,5,6-tetrahydroxy-2-(2'-hydroxytetracosanoyl amino)-8-(E)-octadecadiene (1) and (2S,3S,4R,8E,2'R)-2-[N-(2'-hydroxyoctadecanoyl)-N-(1'',2''-dihydroxyethyl)-amino]-8-hexacosene-1,3,4-triol (2) on the basis of spectroscopic evidence including IR, MS, NMR ((1)H-NMR, (13)C-NMR, DEPT, (1)H-(1)H COSY, HSQC, HMBC). The known compounds were identified as (2S)-3',7-dihydroxy-4'-methoxyflavan (3), (2S)-4'-hydroxy-7-methoxyflavan (4), (2S)-4',7-dihydroxyflavan (5), 7-hydroxy-3', 4'-methylenedioxyflavan (6), ambrettolide (7), beta-sitostero1 (8), beta-daucosterin (9), rutin (10), pancratistatin (11), lycorine (12), haemanthidine (13), and haemanthamine (14). In the antimicrobial assay, candidamide A (1) and candidamide B (2) displayed moderate activities against bacteria Staphylococcus aureus and Escherichia coli, and fungi Aspergillus niger, Candida albicans and Trichophyton rubrum.

[Studies on chemical constituents of the roots of Angelica pubescens].

Objective: To study the chemical constituents of the roots of Angelica pubescens.

Methods: Fresh roots of Angelica pubescens were extracted with EtOH,the chemical constituents in the extract were isolated by column chromatography as macroporous absorption resin,and ODS etc. Their structures were confirmed by spectral analysis (NMR, MS).

[Chemical constituents in the root of Cynanchum auriculatum].

Objective: To study on the chemical constituents of root of Cynanchum auriculatum Royle ex Wight.

Methods: The constituents were isolated and purified by various chromatographic methods, and the spectroscopic methods (MS, NMR) were used to identify their sturctures.

Results: Seven compounds were obtained and identified as: taraxasterol acetate (I), cynanchone A (II), succinic acid (III), betulinic acid (IV), kidjoranin (V), wilfoside CIN (VI), wilfoside KIN (VII).