We report 121/123Sb nuclear quadrupole resonance (NQR) and 51V nuclear magnetic resonance (NMR) measurements on kagome metal CsV3Sb5 with T
c = 2.5 K. Both 51V NMR spectra and 121/123Sb NQR spectra split after a charge density wave (CDW) transition, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first-order phase transition. At low temperature, electric-field-gradient fluctuations diminish and magnetic fluctuations become dominant. Superconductivity emerges in the charge order state. Knight shift decreases and 1/T
1
T shows a Hebel–Slichter coherence peak just below T
c, indicating that CsV3Sb5 is an s-wave superconductor.
Diiron dithiolate complexes have received special attention because of their structural similarity to the active site of [FeFe]-hydrogenases, which are the most efficient and fastest catalysts for the generation of dihydrogen in nature. Recently, we established a novel and efficient way to prepare phosphinesubstituted diiron aza-and oxadithiolate complexes. Reaction of Fe 2 (μ-SCH 2 OH) 2 (CO) 6 and several phosphine ligands L (L = PPh 3 , PPh 2 (2-C 5 H 4 N), P(C 6 H 4 -4-CH 3 ) 3 ) affords the intermediate Fe 2 (μ-SCH 2 OH) 2 (CO) 5 L, while the intermediate in situ reacts with primary amines RNH 25 [PPh 2 (2-C 5 H 4 N)] (5), Fe 2 [(μ-SCH 2 ) 2 NCH 2 CH 2 CH 2 SCH 3 ](CO) 5 [P(C 6 H 4 -4-CH 3 ) 3 ] (6), Fe 2 [(μ-SCH 2 ) 2 N C 6 H 4 -4-CH 3 ](CO) 5 [PPh 2 (2-C 5 H 4 N)] (7), and Fe 2 [(μ-SCH 2 ) 2 N C 6 H 4 -4-CH 3 ](CO) 5 [P(C 6 H 4 -4-CH 3 ) 3 ] (8) in moderate yields. A novel complex Fe 2 [(μ-SCH 2 ) 2 NCH 2 CH 2 PPh 2 ](CO) 5 (9) can be obtained by reaction of Fe 2 (μ-SCH 2 OH) 2 (CO) 6 and Ph 2 PCH 2 CH 2 NH 2 . In addition, according to the same strategy, phosphine-substituted diiron oxadithiolate complexes Fe 2 [(μ-SCH 2 ) 2 O](CO) 5 [P(C 6 H 4 -4-F) 3 ] (10), Fe 2 [(μ-SCH 2 ) 2 O](CO) 5 [P(C 6 H 4 -4-CH 3 ) 3 ] (11), and Fe 2 [(μ-SCH 2 ) 2 O](CO) 5 (Ph 2 PCH 2 CH 3 ) ( 12) have been successfully synthesized. All of the new complexes 1−12 were fully characterized by elemental analysis, IR, and NMR spectroscopy, and particularly for 1−4, 6, 7, and 9−11 by X-ray single diffraction analysis. Moreover, complexes 1 and 10 were found to be catalysts for H 2 production under electrochemical conditions.
High voltage aqueous electrochemical energy storage devices have gained significant attention recently due to their high safety, low cost, and environmental friendliness. Through the addition of a solid‐electrolyte interphase, usage of a concentrated electrolyte or adjustment of the pH of their electrolytes, it is hopeful to endow these aqueous energy‐storage devices with a broadened voltage. Among all of them, aqueous lithium‐ion batteries have a longer lifespan and a promising future in energy storage systems. Herein, aqueous batteries will be introduced by demonstrating their voltage improvement approaches and progress is focused.
A review of P based materials used in LIB/NIB and their synthesis strategies, tailored materials properties and different electrochemical performances.
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