Wei-Ming Bu

Flexiblemeso-Bis(sulfinyl) Ligands as Building Blocks for Copper(II) Coordination Polymers: Cavity Control by Varying the Chain Length of Ligands

Fillings and cavities: Three novel pseudo-octahedral metal-organic frameworks, 1-3, consisting of macrometallacyclic noninterpenetrating meso networks and exhibiting weak antiferromagnetic interactions, have been constructed from CuII centers and structurally flexible R,S-bis(sulfinyl) ligands. Varying the chain length of ligands is found to control the cavity sizes of the networks.

One- and two-dimensional framework materials constructed from the mixed Mo/V tetra-capped Keggin structure clusters and M(en)2 (M=Ni, Cu) complexes groups

Abstract Two novel low-dimensional framework materials, [ Ni ( en ) 2 ] 2 [ Ni ( en ) 2 Mo VI 6 V VI 10 O 40 ( V IV O 4 )]·4 H 2 O (1) and [ en ] 0.5 [ Cu ( en ) 2 ] 2 [ Cu ( en ) 2 Mo VI 6 Mo V 2 V IV 8 O 40 ( Mo IV O 4 )]·0.5 H 2 O (2), assembled hydrothermally, are constructed from the mixed Mo/V tetra-capped Keggin structure clusters linked through M(en)2(M=Ni,Cu) groups.

A metal-oxo cluster-supported transition metal complex: synthesis, structure and properties of [Cu(phen)2]2[{Cu(phen)}2Mo8O26]·H2O

Abstract [Cu(phen)2]2[{Cu(phen)}2Mo8O26]·H2O has been synthesized from MoO3, H2MoO4, Cu(Ac)2·H2O and 1,10-phenanthroline in aqueous solution using the hydrothermal method and characterized by single-crystal X-ray structure analysis. The title compound consists of a centrometric β-octamolybdate-supported complex anion [{Cu(phen)}2Mo8O26]2−, two bis-phenanthroline Cu(I) cations, and one water molecule of crystallization.

Crystal structure and magnetic properties of a Cu4O4 cubane complex with N-(2-hydroxybenzyl)-propanolamine

Abstract The crystal structure of [ Cu ( L 1 )] 4 ( 1 ) (H2L1=N-(2-hydroxybenzyl)-propanolamine) contains a Cu4O4 cubane core, involving four intramolecular hydrogen bonds. Magnetic studies reveal a good linear correlation between 2J and the bridge angle φ; the more antiferromagnetic trend than the literature correlations for the alkoxo-bridged complexes is ascribed to the additional superexchange pathways via the multiple hydrogen bonds.

Syntheses and structures of two- and three-dimensional coordination networks generated from silver complexes and hmt (hmt=hexamethylenetetramine)

Abstract Ag(CO2PhCO2)Ag reacts with hexamethylenetetramine (hmt) in acetonitrile solution in the ratio 1:2 to yield the network [Ag2(μ3-hmt)2(μ-O2CPhCO2)]·7H2O, in which AgCO2PhCO2Ag units intercalate between the two-dimensional honeycomb-like layers to give a three-dimensional open network, while Ag(MePhSO3) reacts with hmt in the ratio 2:1 to produce the coordination network Ag2(μ4-hmt)(MePhSO3)2, consisting of two-dimensional grids with square cavities. The X-ray diffraction studies show that these two metal complexes can be used as molecular building blocks in the synthesis of silver–hmt networks.

Weaker magnetic interactions of oxalato-copper(II) binuclear compounds: synthesis, spectroscopy, crystal structure and magnetism

Abstract Two binuclear copper(II) compounds, Cu2(tacn)2(μ-ox)(ClO4)2 (I) and [Cu2(bdpm)2(H2O)2(μ-ox)](ClO4)2·H2O (II), where tacn=1,4,7-triazacyclononane, ox=oxalate dianion, bdpm=bis(3,5-dimethylpyrazol-1-yl)methane, have been synthesized and characterized by X-ray diffraction. Each copper atom of compound I has a 4+1+1 elongated pseudo-octahedral environment; the copper atoms have distorted square pyramidal geometry in compound II. The magnetic susceptibilities (300–4 K) indicated that the binuclear copper(II) cores were antiferromagnetically coupled (2J=−41 cm−1 for compound I, 2J=−102 cm−1 for compound II). The weakness of the interactions for both compounds is discussed on the basis of the structural features.

Synthesis and crystal structures of unbridged bis(4-R-1,2-diphenylcyclopentadienyl)zirconium dichlorides (R=phenyl, cyclohexyl), and catalysis for olefin polymerization

Abstract Zirconocene complexes carrying sterically bulky tri-substituted cyclopentadienyl ligands, (η5-4-R-1,2-Ph2C5H2)2ZrCl2 [R=phenyl (3), cyclohexyl (4)], were synthesized by the reaction of ZrCl4 with lithio salt of 1,2,4-triphenylcyclopentadiene (1) or 4-cyclohexyl-1,2-diphenylcyclopentadiene (2), respectively. The single-crystal X-ray structure analysis reveals that both complexes crystallize in C2-symmetric conformation in solid state. When activated with methylaluminoxane (MAO), complexes 3 and 4 polymerize ethylene with moderate activities to produce ultra-high-molecular-weight polyethylenes with high melting transition temperatures at low Al/Zr ratios. Under ambient conditions, both systems of 3–MAO and 4–MAO show relatively high activities in propylene oligomerization. The molecular weight of the polypropylene produced from the 3–MAO system is lower than that from the 4–MAO system. In comparison with 4, complex 3 is more active in both ethylene and propylene polymerization.

A mixed pyridine–phenol boron complex as an organic electroluminescent material

A blue light emitting 1,6-bis(2-hydroxyphenyl)pyridine boron complex has been synthesized and used as an emitting material to fabricate electroluminescent devices.

Metal–oxo cluster-supported transition metal complexes: hydrothermal synthesis and characterization of [{M(phen)2}2(Mo8O26)] (M = Ni or Co)

Two new metal–oxo supported transition metal complexes, [{M(phen)2}2(Mo8O26) (M = Ni or Co; phen = 1,10-phenanthroline) are synthesized by a hydrothermal method and characterized by X-ray crystallography, showing that the octamolybdate possesses a novel unprecedented structure and that [M(phen)2]2+ units are covalently bonded to the [Mo8O26]4– cluster.

Hydrothermal synthesis and characterization of [Ni(phen)3]2[Mo8O26]·2H2O

Abstract The reaction of MoO3, H2MoO4 and Ni(Ac)2·6H2O with 1,10-phenanthroline by a hydrothermal method furnishes the discrete cluster [Ni(phen)3]2[Mo8O26]·2H2O (1). The structure of 1 is triclinic, space group P1, a=11.4965(10), b=11.6829(13), c=15.1518(15) A, α=83.032(8), β=71.557(7), γ=78.319(7)°, R=0.0433 for 7397 observed [I>2σ(I)] reflections. The crystallographically determined solid state structure of 1 shows that the cluster consists of two complex cations, one cluster anion [Mo8O26]4− and two water molecules of crystallization. Each nickel ion is coordinated by six nitrogen atoms from three phenanthroline ligands, forming a distorted octahedron, and the anion has a β-configuration formed by eight edge-sharing MoO6 octahedra. Compound 1 was characterized by means of elemental analysis, IR spectra and TGA analysis.