Yun-Hui Li

A dodecanuclear heterometallic dysprosium–cobalt wheel exhibiting single-molecule magnet behaviour

A novel dodecanuclear wheel with ten Dy(III) ions and two Co(II) ions bridged by four Schiff-base ligands and sixteen acetates represents the highest-nuclearity 3d-4f example of its type displaying single-molecule magnet behaviour.

Synthesis of a Hierarchical Three‐Component Nanocomposite Structure System with Enhanced Electrocatalytic and Photoelectrical Properties

Effective control over the morphology and size of Pd/Pt nanoparticles is currently of immense interest because their electronic, optical, and catalytic properties are superior to pure platinum nanoparticles. However, control over the nanoparticle shape is still challenging. Therefore, a novel design and synthetic route needs to be developed to obtain a high-performance catalyst. Herein, a hierarchical three-component nanocomposite structure system (HTNSS) composed of graphene, TiO(2), and Pd@Pt core-shell nanoparticles was designed and synthesized by a sequential strategy that focuses on constructing the monolithic structure rather than limited single-component counterparts. The resulting composites were characterized by various techniques, which showed that the Pd@Pt core-shell nanoparticles were preferentially deposited on the peripheral interface of the graphene and TiO(2) nanoparticles. The photoelectrical and catalytic performances were obviously improved relative to the commercially available E-TEK Pt/C owing to their synergistic effect.

Bis[μ-2-(2-benzoyl­hydrazinylidenemeth­yl)-6-methoxy­phenolato][2-(2-benzoyl­hydrazinylidenemeth­yl)-6-methoxy­phenolato]dimanganese(II) perchlorate methanol solvate

In the title complex, [Mn2(C15H13N2O3)3]ClO4·CH3OH, the two MnII ions are bridged by two phenolate O atoms from two ligands, forming an Mn2O2 quadrangle. Each MnII ion has a distorted octahedral coordination geometry. One MnII ion is coordinated by two N atoms and four O atoms from two ligands, and the other is coordinated by one N atom and five O atoms from three ligands. A dimer is formed by intermolecular N—H⋯O hydrogen bonds. The dimers, perchlorate anions and methanol solvent molecules are further connected into a chain along [01] through N—H⋯O and O—H⋯O hydrogen bonds.

Two 1,8-naphthalenediol-based dysprosium complexes: syntheses, structures, and magnetic properties

Abstract Two mononuclear dysprosium complexes, [Dy(H2L1)2(CH3OH)2]Cl∙6CH3OH (1) and [Dy(H3L2)2(CH3OH)2]Cl∙2H2O (2), derived from 1,8-naphthalenediol-based ligands were synthesized and characterized by single-crystal X-ray diffraction and magnetic measurements. Single-crystal X-ray analyses reveal that the eight-coordinate DyIII ion exhibits distorted triangular dodecahedron geometry in both complexes. The mononuclear units in 2 are further connected into one-dimensional chains via hydrogen-bond interactions. Alternating-current magnetic susceptibility studies indicate that 2 shows slow relaxation of the magnetization with a roughly estimated activation energy of 3 K and pre-exponential factor of 10−6 s, while 1 does not show any ac signals.

[N'-(3-Meth-oxy-2-oxidobenzyl-idene-κO)benzohydrazidato-κN',O]tris-(pyridine-κN)cobalt(III) perchlorate.

In the mononuclear title compound, [CoIII(C15H12N2O3)(C5H5N)3]ClO4, the CoIII ion is coordinated by three pyridine molecules and one N′-(3-methoxy-2-oxidobenzylidene)benzohydrazidate Schiff base ligand in an O,N,O′-tridentate manner. The CoIII ion adopts a distorted CoN4O2 octahedral coordination environment.

(2-Oxido-1-naphthaldehyde benzoyl­hydrazonato-κ3 N,N′,O)pyridine­copper(II)

In the mononuclear title compound, [CuII(C18H12N2O2)(C5H5N)], the CuII ion is coordinated by two O atoms and one N atom from the dianionic tridentate L 2− ligand (H2 L is 2-hydroxy-1-naphthaldehyde benzoylhydrazide) and one N atom from a pyridine molecule in a CuN2O2 distorted square-planar coordination environment.

Bis{2-[(2-benzoyl­hydrazin-1-yl­idene)meth­yl]-6-meth­oxy­phenolato}iron(III) chloride monohydrate

In the title mononuclear iron(III) complex, [Fe(C15H13N2O3)2]Cl·H2O, the FeIII atom has a distorted octahedral geometry and is six-coordinated by four O atoms and two N atoms from two ligands. In the crystal structure, the complex cations, Cl− anions and water molecules are connected into a chain along [100] through N—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds. Two adjacent chains are linked by O—H⋯O hydrogen bonds.

2-(4-Chloro­phen­yl)imidazo[1,2-a]pyridine-3-carbaldehyde

The asymmetric unit of the title compound, C14H9ClN2O, contains two molecules with dihedral angles of 33.52 (11) and 34.58 (11)° between their benzene rings and imidazole ring systems. In the crystal, C—H⋯N and C—H⋯O interactions are observed. The crystal examined was found to be a racemic twin.