Chun-Dan Zhang

A three-dimensional porous metal-organic framework with the rutile topology constructed from triangular and distorted octahedral building blocks

The solvothermal reaction of zinc acetate dihydrate with 1,3,5-benzenetricarboxylic acid yields a three-dimensional porous metal-organic framework constructed from triangular and distorted octahedral building blocks, the framework of which can be described as a decorated rutile net.

An organic-inorganic hybrid material constructed from a three-dimensional coordination complex cationic framework and entrapped hexadecavanadate clusters

A unique organic-inorganic hybrid compound has been separated under hydrothermal condition, which is constructed from a three-dimensional second metal-organic subunit and entrapped hexadecavanadate clusters.

Reactions of trivacant lone-pair-containing tungstobismutate and electrochemical behaviors of its sandwich-type products

We report the crystal structure of dimeric precursor Na12[(Na(H2O)2)6(α-BiW9O33)2] (1), and the interaction of this precursor with transition metal ions. Interaction of 1 with Cu2+ in neutral medium leads to the formation of a Hervé-type sandwich polyoxoanion [(Cu(H2O))3(α-BiW9O33)2]12− (2) in high yield. Interaction of 1 with M2+ (M = Zn, Ni, Co, Mn) in acidic aqueous medium leads to formation of Krebs-type sandwich polyoxoanions [(M(H2O)3)2(WO)2(β-BiW9O33)2]10− (3–6). Coordination geometry of the M2+ ions, counterions and precursors can affect the structure of products. In our experiments, only the interaction of 1 with Cu2+ forms a trisubstituted sandwich-type product. The method using [α-BiIIIW9O33]9− as starting material is a convenient and effective route for the synthesis of sandwich-type tungstobismutates in high purity and yield. The electrochemical properties of these sandwich-type tungstobismutates in aqueous solution are described.

Hydrothermal assembly of pyrite-related framework: (NH4)2{[Ni(H2O)3]2[TeW6O24]}·H2O

A new 3D heteropolyoxotungstate, (NH4)2{[Ni(H2O)3]2[TeW6O24]} · H2O (1), has been isolated from hydrothermal reactions and characterized by elemental analyses, IR spectra and X-ray crystallography. Single-crystal X-ray diffraction analysis reveals that compound 1 possess unusual (3,6)-connected networks constructed from Anderson-type anions [TeW6O24]6− and nickel cations. The compound exhibits pyrite-like topology in which [TeW6O24]6− anions act as 6-connecting sites and nickel cations act as 3-connecting sites. The magnetic properties of 1 are also presented.

Synthesis and Structure of a Novel Supramolecular Compound [Co(2,2′-bipy) (H2O)4] [trans-1, 4-chdc] and Separation of Isomer of 1, 4-Cyclohexanedicarboxylic Acid

A supramolecular compound, [Co(2,2′-bipy) (H2O)4] [trans-1, 4-chdc] (compound 1) (2,2′-bipy = 2,2′-bipyridine, 1,4-chdcH2 = 1, 4-cyclohexanedicarboxylic acid), was synthesized and characterized by single-crystal X-ray diffraction analysis, IR spectrometry, TG analysis, and elemental analyses. Single-crystal X-ray diffraction analysis revealed that [Co(2,2′-bipy) (H2O)4]2+ units and adjacent 1, 4-chdc2− formed a single layer by hydrogen bonding and electrostatic interactions along the ac-plane, and two symmetry-related single layers interacted with each other by hydrogen bonding, resulting in a double layer, which further formed a 3-D structure by π-π stacking. The most attractive structural feature of compound 1 is that 1, 4-choc2− possesses only trans-conformation although there are both cis- and trans-conformations in the raw material.