Bao-Xia Dong

Improved dehydrogenation properties of the LiNH2–LiH system by doping with alkali metal hydroxide

In this study, the hydrogen desorption properties of the LiNH2–LiH system were investigated and discussed by doping with alkali metal hydroxide (LiOH, NaOH, and KOH). It was determined that the three types of hydroxides are effective for enhancing the hydrogen desorption properties of the LiNH2–LiH system, among which, KOH shows the best effect. In comparison with the broad-shaped hydrogen desorption curve of the LiNH2–LiH system without an additive, the hydrogen desorption curve of the LiNH2–LiH–0.05KOH composite becomes narrow. By doping with 5 mol% KOH, the dehydrogenation onset temperature of the LiNH2–LiH composite is decreased by about 36 °C, and the dehydrogenation peak temperature is lowered by about 42 °C. Detailed structural investigations reveal that during ball milling, the doped alkali metal hydroxide can react with LiH to convert to alkali metal hydride, which is responsible for the improvement in the hydrogen desorption properties of the LiNH2–LiH system.

Spontaneous resolution of 3D chiral hexadecavanadate-based frameworks incorporating achiral flexible and rigid ligands

Introducing of mixed flexible and rigid achiral ligands into the hexadecavanadate skeleton leads to the isolation of two enantiomerically 3D chiral hexadecavanadate derivatives, which represent the first example of chiral polyoxometalate-based framework functionalized with mixed flexible and rigid achiral ligands.

A New 2D Network Constructed from the Extension of Transition-Metal-Grafted e-Keggin Polyoxoanion by a Bridging Organic Carboxylate

By introducing a bridging ligand of 5-methylisophthalic acid (shortened as 5-mip) into the tetrahedral Zn4-ε-Keggin system, a new 2D network of [TBA]3[H4PMo8VMo4VIO40Zn4][C7H6(COO)2]2 (1) was synthesized under hydrothermal condition. It was characterized by FT-IR, BET, TGA/DSC-MASS analysis, powder X-ray diffraction and single-crystal X-ray diffraction, respectively. Besides, compound 1 shows remarkable electrocatalytic activity towards bromate reduction.

The ternary amide KLi3(NH2)4: an important intermediate in the potassium compound-added Li–N–H systems

In this paper, the KH-added LiH–NH3, KH-added LiH–LiNH2, KH-added LiNH2, and KNH2-added LiNH2 systems were systematically investigated. It was found that the ternary amide KLi3(NH2)4 was an important intermediate that was inclined to be formed in the dehydrogenation and hydrogenation processes of the potassium compound-added Li–N–H system. Further investigations revealed that both the solid state reaction of LiNH2 with KNH2 and the solid state reaction of LiNH2 with KH under mechanical ball milling or heat treatment conditions will lead to the formation of the KLi3(NH2)4 ternary amide. Moreover, the ternary amide KLi3(NH2)4 single phase was successfully synthesized by the mechanical ball milling and its ammonia desorption and hydrogenation properties were investigated. It was observed that the ammonia desorption rate of KLi3(NH2)4 was faster than that of LiNH2 and the hydrogen absorption kinetics of KLi3(NH2)4 were between those of KNH2 and LiNH2.

The interesting and superior hydrogenation properties of potassium-doped LiNH2 and its ternary mixed-cationic amide

It was found that the hydrogenation kinetics for the LiNH2 system can be drastically improved by introducing a small amount of KNH2 or KH (5 mol%). The reason for the improvement is that KNH2 or KH can interact with LiNH2 forming a KLi3(NH2)4 ternary amide phase with superior reactivity to hydrogen (H2).

Synthesis, Crystal Structure and Electrochemical Properties of A New 2D Network Containing Linear {ε-H 2 PMo 8 V Mo 4 VI O 40 Zn 4 } ∞ Inorganic Chain

A new 2D network formulated as [TBA]3[H2PMo8VMo4VIO40Zn4][C7H6(COO)2] (1) containing linear inorganic chain {ε-H2PMo8VMo4VIO40Zn4}∞ has been synthesized and structurally characterized by FT-IR, thermal analysis, single crystal and powder X-ray diffraction. Compound 1 shows remarkable electrocatalytic activity towards bromate reduction, nitrite reduction and ascorbic acid oxidation. Moreover, the proton conduction behavior of 1 has also been investigated.

Synthesis, characterization, and crystal structure of a 3D coordination polymer [Cd2·(H3C9N12)·Cl·(H2O)2]

ABSTRACT A new Cd(II) coordination polymer has been prepared by solvothermal synthesis and characterized by single-crystal X-ray diffraction, IR, and element analysis. Complex [Cd2·BTT·Cl·(H2O)2]n (1) [H3BTT = 1,3,5-tris(2H-tetrazol-5-yl)benzene] is monoclinic, space group P217sol;c with a = 10.601(11) Å, b = 15.5428(16) Å, c = 9.0083(9) Å, β = 106.117(3)°, V = 1426.0(3) Å3. The final refinment gave R = 0.0192, and wR = 0.0473 for reflections with I > 2σ(I). Single-crystal X-ray diffraction analysis reveals that the compound 1 is a novel three-dimensional framework, featuring three types of connections of the tetrazole ring.