Hong-Mei Li

Construction of Two New Metal–Organic Entangled Frameworks Via Varying Flexible Bis(Imidazole)-based Auxiliary Ligands

Two new metal–organic entangled frameworks, namely [Cd(FA)0.5(bix)1.5(H2O)]n·nNO3 (1) and [Cd(FA)(bib)(H2O)2]n (2) (FAxa0=xa0fumaric acid, bixxa0=xa04,4′-bis(imidazol-1-ylmethyl)benzene, bibxa0=xa01,4-bis(imidazolyl)butane), have been successfully hydrothermally synthesized through mixed ligands strategy. Single crystal X-ray diffraction analysis reveal that 1 is a 2Dxa0→xa03D polycatenated framework, while 2 is a triply interpenetrated 4-connected dia topological net. Moreover, both compounds exhibit intense luminescence emission at room temperature.

Metal-directed topological diversity of three fluorescent metal–organic frameworks based on a new tetracarboxylate strut

Three d- or p-block metal ions based metal–organic frameworks (MOFs) were isolated by employing a new tetracarboxylate linker, featuring unusual flu, self-interpenetrated lvt and new (3,5)-c topological nets, respectively. Interesting photoluminescent properties of these solid-state materials were also observed.

N-heterocyclic carbene adducts of cyclopalladated ferrocenylpyridine containing chloride or iodide anions: synthesis, crystal structures and application in the coupling of terminal alkynes with arylboronic acids

Two air-stable N-heterocyclic carbene (NHC) adducts of cyclopalladated ferrocenylpyridine containing chloride or iodide anions 2–3 have been easily prepared from the bridge-splitting reaction of the palladacyclic dimer 1 and anion exchange reaction, respectively. They were characterized by elemental analysis, IR, 1H, and 13C NMR. Additionally, the structures of these complexes were determined by single-crystal X-ray analysis. These adducts have been successfully applied to the coupling of terminal alkynes with arylboronic acids under atmospheric conditions.

N-Heterocyclic Carbene Adducts of Cyclopalladated Ferrocenylpyridazine: Synthesis, Structural Characterization, and Application in ?-Arylation of Ketones with Aryl Chlorides

A new ferrocene-based ligand 3-chloro-6-pyridazinylferrocene 1 and its N-heterocyclic carbene adducts 2–3 were synthesized and characterized by 1H NMR and IR spectroscopy, ESI-MS, and elemental analysis. Additionally, detailed structures of complexes 2–3 have been determined by single-crystal X-ray analysis. Complex 3 exhibited high catalytic activity for α-arylation of ketones with aryl chlorides. Typically, using 1u2009molu2009% catalyst in the presence of 1.5 equivalents of tBuOK as base in dioxane at 100°C provided coupled products in good yields.

Photoluminescence Properties of a New Homochiral srs-Type Coordination Polymer Employing Dinuclear [Zn2(COO)3] Units as Building Blocks

Qe report a new compound, namely [Zn2(BTC)(NO3)(DMA)3]n, with 1,3,5-benzenetricarboxylic acid (H3BTC) and N,N′-dimethylacetamide (DMA) by the solvothermal method. The compound is characterized by elemental analysis, thermal analysis and X-ray diffraction (XRD). Single crystal XRD analysis reveals that the compound is an extended three-dimensional framework containing dinuclear [Zn2(COO)3] units as building blocks and can be simplified into a 3-connected srs topological network. There are two kinds of graceful helical chains with opposite chirality. The compound exhibits strong photoluminescent properties at room temperature.

Synthesis, characterization, and crystal structures of aryl-substituted ferrocenylpyrimidines by site-selective stepwise couplings of 2,4,6-trichloropyrimidine

A new ferrocenylpyrimidine containing chlorine was conveniently prepared via the coupling reaction of chloromercuriferrocene and 2,4,6-trichloropyrimidine, and a monoaryl-substituted ferrocenyl-pyrimidine was also readily obtained from the Suzuki coupling of the former with phenylboronic acid. The following Suzuki coupling of the monoaryl-substituted derivative with arylboronic acids in the presence of Pd(OAc)2/P(Cy)3·HBF4 gave diaryl-substituted ferrocenylpyrimidines. These compounds were characterized by elemental analysis, IR, MS, 1H and 13C NMR. Additionally, the structures of the three compounds were determined by single-crystal X-ray analysis.Graphical abstract

Synthesis and Characterization of Triphenylphosphine Adducts of Ferrocene-Based Palladacycles and Their Performance in the Suzuki and Sonogashira Reactions with Bromo- and Chloroarenes

A new triphenylphosphine adduct of cyclopalladated ferrocenylpyridazine containing a chloride anion, 2a, has been synthesized from the reaction of the chloride-bridged palladacyclic dimer 1a with triphenylphosphine. The corresponding adducts 3a,b containing iodide anion have been readily prepared through anion exchange reactions of 2a,b with NaI in acetone. These complexes were characterized by elemental analysis, IR and 1H-NMR. Additionally, their crystal structures have been determined by X-ray diffraction and intermolecular C–H···X (Cl, Br, I) bonds were found in the crystals. The use of these palladacycles as catalysts for the Suzuki and Sonogashira reactions was examined. The complexes 2a,b exhibited higher catalytic activity than the corresponding 3a,b in the Suzuki reaction. However, the order of activity of adducts with varying halogen anions is 3a~3b > 2a~2b in the Sonogashira reaction.

Two fluorescent cyclopalladated arylpyrazine complexes: synthesis, crystal structures and application in the double Suzuki coupling of N-heteroaryl halides with 1,4-benzenediboronic acid

Two 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (Sphos) adducts of cyclopalladated arylpyrazine complexes have been synthesized and characterized. Additionally, the structures of both complexes were determined by single-crystal X-ray analysis. These palladacycles are fluorescent in CH2Cl2 at room temperature. They have been applied to the double Suzuki coupling of N-heteroaryl halides with 1,4-benzenediboronic acid, giving the desired products in good yields.

Synthesis, Structural Characterization, Properties of a Silver Coordination Polymer Based on [1,1′-Biphenyl]-2,4,4′,6-tetracarboxylic Acid (H4BPTC)

A new silver coordination polymer [Ag4(BPTC)]n has been synthesized by solvothermal reaction of AgNO3 and H4BPTC. The X-ray crystal structural analysis indicates that 1 is a 2D coordinated framework, which contains argentophilic interactions and Ag–C interactions. The thermal stability and luminescent properties were also investigated. In addition, it was found to be efficient catalyst for the Sonogashira reaction.

Water-soluble palladacycles containing hydroxymethyl groups: synthesis, crystal structures and use as catalysts for amination and Suzuki coupling of reactions

Two water-soluble monophosphine [PPh3 and 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl(Sphos)]-palladacycles containing hydroxymethyl groups 2–3 were prepared by cyclopalladation and chloride bridge-splitting reactions. The complexes were characterized by elemental analysis, ESI–MS and NMR. In addition, single-crystal X-ray analysis reveals that they have one-dimensional lamellar structures involving intermolecular hydrogen bonds and π–π interactions. The use of these palladacycles as catalysts for amination and Suzuki coupling of aryl chlorides in water was investigated. Complex 3 was found to be very efficient for these coupling reactions. Additionally, it was also successfully used in Suzuki coupling of (hydroxymethyl)phenylboronic acid for the synthesis of substituted 2-N-heterocyclic biarylmethanols.