Enhanced Cooperative Generalized Compressive Strain and Electronic Structure Engineering in W-NiN for Efficient Hydrazine Oxidation Facilitating H Production.

As promising bifunctional electrocatalysts, transition metal nitrides are expected to achieve an efficient hydrazine oxidation reaction (HzOR) by fine-tuning electronic structure via strain engineering, thereby facilitating hydrogen production. However, understanding the correlation between strain-induced atomic microenvironments and reactivity remains challenging. Herein, a generalized compressive strained W-NiN catalyst is developed to create a surface with enriched electronic states that optimize intermediate binding and activate both water and NH.

Synthesis and proton-conductive behaviour of two MOFs with covalently bonded imidazoles in the channels.

Immobilization of imidazole molecules as proton carriers into MOFs to facilitate proton conduction is a general strategy for developing high proton conductive materials. Herein, we designed two imidazole substituted phthalic acid ligands and constructed two novel MOFs, {[Zr(OH)(HL)]Cl·20HO} [Zr-MOF; HL = 2-(1-imidazol-4-yl) methylaminoterephthalic acid] and {Gd(HCOO)(HL)} [Gd-MOF; HL = 5-(1-imidazol-4-yl)methylaminoisophthalic acid] and fully studied their porous nature, stability and water-assisted proton conduction. The resulting Zr-MOF exhibits a high proton conductivity of 1.

γ-MnO as an Electron Reservoir for RuO Oxygen Evolution Catalyst in Acidic Media.

Developing highly active and durable catalysts in acid conditions remains an urgent issue due to the sluggish kinetics of oxygen evolution reaction (OER). Although RuO has been a state-of-the-art commercial catalyst for OER, it encounters poor stability and high cost. In this study, the electronic reservoir regulation strategy is proposed to promote the performance of acidic water oxidation via constructing a RuO/MnO heterostructure supported on carbon cloth (CC) (abbreviated as RuO/MnO/CC).

Anchoring of Fe-MIL-101-NH to the Polymer Membrane Matrix through the Hinsberg Reaction to Promote Conductivity of SPEEK Membranes.

SCPEEK@MOF proton exchange membranes, where SCPEEK is sulfinyl chloride polyether ether ketone and MOF is a metal-organic framework, were prepared by doping Fe-MIL-101-NH into polymers. The amino group in the MOF and the -SOCl group in thionyl chloride polyether ether ketone cross-link to form a covalent bond through the Hinsberg reaction, and the prepared composite membrane has stronger stability than other electrostatic interactions and simple physical doping composite membranes. The formation of covalent bonds improves the water absorption of the composite membrane, which makes it easy for water molecules to form hydrogen bonds.

Composite Quasi-Solid-State Electrolytes with Organic-Inorganic Interface Engineering for Fast Ion Transport in Dendrite-Free Sodium Metal Batteries.

Quasi-solid-state electrolytes (QSSE) are a promising candidate for addressing the limitations of liquid and solid electrolytes. However, different ion transport capacities between liquid solvents and polymers can cause localized heterogeneous distribution of Na fluxes. In addition, the continuous side reactions occurring at the interface between QSSE and sodium anode lead to uncontrollable dendrites growth.

Inorganic-Organic Hybrid Multifunctional Solid Electrolyte Interphase Layers for Dendrite-Free Sodium Metal Anodes.

Constructing a stable and robust solid electrolyte interphase (SEI) is crucial for achieving dendrite-free sodium metal anodes and high-performance sodium batteries. However, maintaining the integrity of SEI during prolonged cycle life under high current densities poses a significant challenge. In this study, we propose an integrated multifunctional SEI layer with inorganic/organic hybrid construction (IOHL-Na) to enhance the durability of sodium metal anode during reduplicative plating/stripping processes.

High Proton Conductivity of the UiO-66-NH-SPES Composite Membrane Prepared by Covalent Cross-Linking.

A sulfonated poly(ethersulfone) (SPES)-metal-organic framework (MOF) film with excellent proton conductivity was synthesized by anchoring UiO-66-NH to the main chain of the aromatic polymer through the Hinsberg reaction. The chemical bond was formed between the amino group in MOFs and the -SOCl group in chlorosulfonated poly(ethersulfones) to conduct protons in the proton channel of the membrane, making the membrane have excellent proton conductivity. UiO-66-NH is successfully prepared as a result of the consistency of the experimental and simulated powder X-ray diffraction (PXRD) patterns of MOFs.

A Universal Synthesis Strategy for Lanthanide Sulfide Nanocrystals with Efficient Photocatalytic Hydrogen Production.

As an important lanthanide (Ln)-based functional materials, the Ln chalcogenides possess unique properties and various applications. However, the controllable synthesis of Ln chalcogenide nanocrystals still faces great challenges because of the rather poor affinity between Ln and chalcogenide ions (S, Se, Te) as well as strong preference of combination with existed oxygen. Herein, a facile but general heterogeneous nucleation synthetic strategy is established toward a series of colloidal ternary Cu Ln sulfides nanocrystals using the Ln dithiocarbamates and CuI as precursors.

Pyrazine-Functionalized Donor-Acceptor Covalent Organic Frameworks for Enhanced Photocatalytic H Evolution with High Proton Transport.

The well-defined 2D or 3D structure of covalent organic frameworks (COFs) makes it have great potential in photoelectric conversion and ions conduction fields. Herein, a new donor-accepter (D-A) COF material, named PyPz-COF, constructed from electron donor 4,4',4″,4'″-(pyrene-1,3,6,8-tetrayl)tetraaniline and electron accepter 4,4'-(pyrazine-2,5-diyl)dibenzaldehyde with an ordered and stable π-conjugated structure is reported. Interestingly, the introduction of pyrazine ring endows the PyPz-COF a distinct optical, electrochemical, charge-transfer properties, and also brings plentiful CN groups that enrich the proton by hydrogen bonds to enhance the photocatalysis performance.

Bifunctional Metal-Organic Framework Functionalized by Dimethylamine Cations: Proton Conduction and Iodine Vapor Adsorption.

A metal-organic framework, {Zn(BTB)(μ-OH)[(CH)NH](HO)} (), was synthesized based on HBTB (1,3,5-tri(4-carboxyphenyl)benzene). An AC impedance test proves that has a relatively high conductivity performance of 1.52 × 10 S·cm at 338 K and 98% RH.

Slow magnetic relaxation in a Dy triangle and a bistriangular Dy cluster.

Two lanthanide single-molecule magnets (SMMs) [Dy(μ-OH)(HL-1)(HO)](NO)·3HO (1, HL-1 = ()-3-(((8-hydroxyquinolin-2-yl)methylene)amino)propane-1,2-diol) and [Dy(μ-OH)(HL-2)(HL-2)(L-2)] (2, HL-2 = ()-2-hydroxy-'-(2-hydroxy-3-methoxybenzylidene)benzohydrazide) were synthesized and characterized structurally and magnetically. Complex 1 contains a triangular Dy core in which the three Dy ions share a μ-OH anion and the deprotonated ligands of (HL-1) serve both capping and bridging functions, while 2 displays a centrosymmetric hexanuclear Dy structure with two similar Dy triangular cores ligated by two fully deprotonated (L-2) ligands, each of which shares two μ-OH anions. All the Dy ions are eight-coordinated with quasi or symmetry.

Enantiomorphic Single Crystals of Linear Lead(II) Bromide Perovskitoids with White Circularly Polarized Emission.

Chiroptical hybrid organic-inorganic perovskites are emerging as a new class of promising materials with mirror optical signal responses for optoelectronic applications. However, chiroptical white-emission materials have been scarcely unearthed. Herein, four pairs of hybrid lead(II) bromide perovskitoids were obtained, namely, (R)- and (S)-(H MPz)PbBr (R/S-MPz=(R)-(-)/(S)-(+)-2-methylpiperazine) (1 and 2), (R)- and (S)-(H MPz) Pb Br ⋅2 DMAc (3 and 4), (R)- and (S)-(H MPz)PbBr ⋅0.

A dual-function Cd-MOF with high proton conduction and excellent fluorescence detection of pyridine.

Metal-organic frameworks have great potential in the field of proton conducting materials and fluorescent probes due to their structural tunability and designability. A novel water-stable metal organic framework material [Cd(Hdpb)(HO)] (Cd-MOF) was synthesized based on Hdpb (Hdpb = 3,5-diphosphonobenzoic acid) and Cd ions. Cd ions are connected with phosphonates and carboxyl groups of Hdpb to form an infinitely extended 1D chain, which is further connected by the Hdpb ligand and coordinated water to form a three-dimensional network structure.

Designable Guest-Molecule Encapsulation in Metal-Organic Frameworks for Proton Conductivity.

Metal-organic frameworks (MOFs), as a porous frame material, exhibit considerable electrical conductivity. In recent decades, research on the proton conductivity of MOFs has made gratifying progress. In this review, the designable guest molecules encapsulated into MOFs are summarized and generalized into four types in terms of promoting proton conductive performance, and then recent progress in the promotion of proton conductivity by MOFs encapsulating guest molecules is discussed.

Room-temperature phosphorescence of manganese-based metal halides.

Room-temperature phosphorescent (RTP) materials can be used in anti-counterfeiting, organic light-emitting diodes and displays. However, designing RTP materials with a long luminescence lifetime and high solid-state emission efficiency is still a challenge. Due to the strong quantum confinement effect and the hydrogen bond network structure formed by polyamino sites, 0D RTP materials usually have a higher fluorescence quantum yield and longer phosphorescence lifetime.

Dual-Functional Coordination Polymer with High Proton Conductivity and a Low-Detection-Limit Fluorescent Probe.

A coordination polymer with dual functions of high proton conductivity and highly sensitive fluorescent sensors demonstrates a great application potential. In this work, a cadmium-based coordination polymer (denoted as CP ) with hydrothermal stability was synthesized. The abundant coordination water, lattice water, and amino groups make an extended hydrogen-bonding pathway for efficient proton migration, which endows CP with the highest proton conductivity of 2.

High Proton Conductivity of a Cadmium Metal-Organic Framework Constructed from Pyrazolecarboxylate and Its Hybrid Membrane.

A new type of metal-organic framework, [Cd(pdc)(HO)(DMA)] (pdc = 3,5-pyrazoledicarboxylic acid; DMA = dimethylamine), named Cd-MOF, was synthesized and characterized. There are regular rectangular pore channels containing a large number of dimethylamine cations in the crystal structure. AC impedance test results show the proton conductivity of Cd-MOF reaches 1.

Promotion of Proton Conductivity by Encapsulation of Metal-Organic Polyhedra in Metal-Organic Frameworks.

A Zr-based metal-organic polyhedron (MOP) was self-assembled in a porous MOF host, DUT-68, successfully to synthesize MOP-1@DUT-68. The MOP guest (MOP-1) has a diameter of about 20 Å, larger than that of the square windows (pore sizes of ∼14 Å) of DUT-68 but smaller than that of the rhombicuboctahedral cage (27.7 Å), which means that the migration and leaching of MOP-1 could be effectively prohibited if MOP-1 is encapsulated in the MOF's cavities.

Dual-functional coordination polymers with high proton conduction behaviour and good luminescence properties.

Two coordination polymers, [M(5-hip)(H2O)3]n (M = Cd2+ (1), Zn2+ (2), 5-hip = 5-hydroxyisophthalic acid), have been synthesized under hydrothermal conditions. The crystal structure reveals that complexes 1 and 2 have 1D chain structures by the coordination of metal ions and 5-hip. 1D chains are connected by hydrogen bonds to form a 3D structure.

Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature.

Stimulus-responsive metal-organic frameworks (MOFs) can be used for designing smart materials. Herein, we report a family of rationally designed MOFs which exhibit photoresponsive chiroptical and magnetic properties at room temperature. In this design, two specific nonphotochromic ligands are selected to construct enantiomeric MOFs, {Cu(L-mal)(bpy)(HO)·3HO} (1) and {Cu(D-mal)(bpy)(HO)·3HO} (2) (mal = malate, bpy = 4, 4' - bipyridine), which can alter their color, magnetism, and chiroptics concurrently in response to light.

A dual-functional MOF for high proton conduction and sensitive detection of ascorbic acid.

A new metal-organic framework (MOF), [Eu2(HBDPP)2(H2O)2(DMF)2](H2O)2 (H4BDPP = 3,5-bis(3,5-dicarboxylphenyl) pyridine; DMF = N,N-dimethylformamide) (Eu-MOF), has been successfully synthesized under solvothermal conditions. A 1D chain was formed by the adjacent Eu2(COO)24+ dinuclear cluster and HBDPP3-, and further connected by HBDPP3- to form an infinitely extended 3D structure. In order to further improve the proton conductivity of the Eu-MOF, imidazole was encapsulated in its pores to form a composite material named Im@Eu-MOF.

High proton conductivity in a nickel(ii) complex and its hybrid membrane.

A novel nickel(ii) complex, [Ni(2,2'-bpy)3](H2SBTC)(H2O)5 (1) (2,2'-bpy = 2,2'-bipyridyl), was synthesized based on [Ni(2,2'-bpy)3]2+ discrete units and a partially deprotonated sulfonate-carboxylate ligand of H4SBTC (5-sulfonyl-1,2,4-benzentricarboxylic acid). The adjacent [Ni(2,2'-bpy)3]2+ cationic units were connected to H2SBTC2- anions by hydrogen bonds to form a one-dimensional (1-D) chain. The 1-D chains were further linked using hydrogen bonds from free water molecules and H2SBTC2- anions to generate a two-dimensional (2-D) plane structure.

Photoinduced electron transfer and remarkable enhancement of magnetic susceptibility in bridging pyrazine complexes.

Three isostructural coordination polymers of the formula [MCl2(DMSO)2(pz)]n (pz = pyrazine, DMSO = dimethyl sulfoxide, M = Mn, Fe and Co for 1-3) were synthesized through the solvothermal reaction of MCl2, DMSO and pz. By introducing DMSO and chloride as electron donor ligands and pz as an accepter, a donor-metal-accepter (D-M-A) system was constructed. Radicals generated by photoinduced electron transfer (PET) from a donor to an accepter result in a dramatic change of vibronic absorption spectra in UV regions and remarkable enhancement of magnetic susceptibility.

2D europium coordination polymer as a regenerable fluorescence probe for efficiently detecting fipronil.

Recently, considerable attention has been paid to European eggs that were found to contain the poisonous insecticide fipronil. Excessive consumption of fipronil can harm the human body, in particular, the liver, thyroid, nervous system and kidneys. As a consequence, there is an urgent need to develop a method to detect fipronil.