Dongbin Dang

Structural and Catalytic Performance of a Polyoxometalate-Based Metal−Organic Framework Having a Lanthanide Nanocage as a Secondary Building Block

A polyoxometalate-based lanthanide-organic framework was achieved using the {[Ho(4)(dpdo)(8)(H(2)O)(16)BW(12)O(40)] (H(2)O)(2)}(7+) nanocage as a secondary building block for the heterogeneous catalysis of phosphodiester cleavage in an aqueous solution.

Conformational switching fluorescent chemosensor for chloride anion

A new fluorescent “off–on” signaling chemical sensor with high selectivity for chloride anion through a guest-induced conformational switching process was achieved by using a positively charged tripodal receptor with naphthyl groups attached to the benzoimidazolium arms.

Anion induced binding electrochemical signal transduction in ferrocenyl benzolimidazolium podands

Benzene-based bipodal and tripodal electrochemical-responsive receptors with ferrocenyl arms comprising benzoimidazolium moieties were synthesized and structurally characterized. The two-arm para compound 1·2Br exhibited a cisoid conformation with the two ferrocene moieties positioned in the same side and a templating bromide anion sited inside. The cisoid form was stabilized not only by the (C–H)+⋯Br− hydrogen bond, but also cooperated by the C–H⋯Br− hydrogen bonding related to the Cp rings of the ferrocenyl moieties and the CH2 groups, respectively. The association constants of the receptor 1 for Cl−, Br− and I− were determined using 1H NMR titration in d6-DMSO as 600 M−1, 440 M−1 and 350 M−1, respectively. The meta three-arm compound 2·3Br adopted a cone conformation with a bromide anion sited inside the molecular cavity and three ferrocene-containing arms positioned on the same side. The cationic heterocycle interacted with the bromide anion through the three-fold C–H⋯Br− hydrogen bonding. 1H NMR titrations in d6 DMSO revealed that the association constants of 2 for Cl−, Br− and I− were 9.7 × 103 M−1, 6.8 × 103 M−1 and 120 M−1, respectively. Electrochemical measurements demonstrated that directed hydrogen bonding between the ferrocenyl moiety and the anion was important for the two-arm receptor 1 exhibiting more efficient binding electrochemical signal transduction.

Construction of polyoxometalate-based inorganic-organic compounds using silver(I) double helicates as secondary building blocks.

Two polyoxometalate-based silver(I) compounds including a three-dimensional porous crystalline array and a double-helicate bisupporting cluster were achieved using metal-organic helicates and Keggin [PMo(12)O(40)](3-) as secondary building blocks.

Porous material for absorption and luminescent detection of aromatic molecules in water

A two-dimensional porous framework, which was formed from neutral discrete hexanuclear copper clusters via self-assembly, exhibited highly selective absorption of aromatic molecules in water with special fluorescent response.

Syntheses and crystal structures of two new nickel 1,2,5-thiadiazole-3, 4-dithiolate complexes as benzylpyridinium salts

Two new complexes, [BrBzPy]2[Ni(tdas)2] (1) and [BrFBzPy]2[Ni(tdas)2] (2), have been prepared by reaction of disodium 1,2,5-thiadiazole-3,4-dithiolate (Na2tdas), NiCl2·6H2O and 1-(4′-bromobenzyl) pyridinium bromide (BrBzPyBr) or 1-(4′-bromo-2′-fluorobenzyl)pyridinium) bromide (BrFBzPyBr). Crystallographic data for 1: monoclinic, P21 /c, a = 11.333(1), b = 12.602(1), c = 12.267(1) Å, β = 115.65(1)°, V = 1579.4(18) Å3, Z = 4. Data for 2: triclinic, , a = 7.437(2), b = 10.382(2), c = 11.330(2) Å, α = 110.07(3), β = 92.58(3), γ = 93.32(3)°, V = 818.5(2) Å3, Z = 1. In the complexes, the [Ni(tdas)2]2− anion exhibits a quasi-planar structure. The topology of the countercation results in different stacks of molecules in the complexes.

A three dimensional porous metal–organic framework [Fe4L6·(DMF)3·(H2O)10] constructed from neutral discrete Fe4L6 pyramids [H2L = 1,3-benzodihydroxamix acid]

A 3-D porous zeolite-like metal-organic framework surviving guest removal is assembled from a well-defined tetrahedral Fe(4)L(6) cavity by the cooperativity of hydrogen bonds and [small pi]-[small pi] stacking.

Enantiomeric interpenetrating 3D nets with chiral silver helicates

A new enantiomeric interpenetrating 3D nets with chiral helical coordination silver(i) polymer was achieved via self-assembly using the new ligand modular approach, in which the special helical conformation of the ligand provided the opportunity to translate chirality from one metal center to others.

Self-assembly of a 1D heterotrimetallic Cu(II)-Sr(II)-Na(I) propeller-like chiral coordination polymer with ferromagnetic interactions

Self-assembly of metalloligand [CuL](-)(H(3)L =N-5-bromosalicylaldehydeglycyl-l-tyrosine) with Sr(2+) and Na(+) results in a 1D micro(2)-carboxylate- and H(2)O-bridged heterotrimetallic chiral coordination polymer [[Na(CuL)(3)Sr(H(2)O)(3)].9H(2)O]](n), which exhibits weak ferromagnetic exchange interactions and optical activity.

Preparation, crystal structure and magnetic properties of a maleonitriledithiolate salt of the 1-methyl-3-benzylimidazolium cation with a novel structural motif

A new ion-pair complex, 1-methyl-3-benzylimidazolium bis(maleonitriledithiolato)nickelate(III), has been synthesized and characterized by IR spectroscopy and X-ray crystallography. The compound crystallizes in the triclinic space group P with a = 13.280(1), b = 14.906(1), c = 17.949 (2) Å, α = 108.02(1), β = 101.55(1), γ = 90.51(1)° and Z = 6. There are three inequivalent [Ni(mnt)2]− anions in the structure of the complex, two of them are stacked along the b axis with an AACC-type repeat unit, the other lies approximately orthogonal to the stack. Anions form three kinds of dimers with short Ni···Ni distances, leading to such strong spin coupling interactions that the complex is diamagnetic.