Yong-Qiang Chen

A Cu(I) metal–organic framework with 4-fold helical channels for sensing anions

A new Cu(I) metal–organic framework, {[Cu(pytpy)]·NO3·CH3OH}∞ (1), which is a 4-fold interpenetrating 3D framework with (10,3)-b topology, has been synthesized by self-assembly of Cu(NO3)2·3H2O with 2,4,6-tris(4-pyridyl)pyridine (pytpy) in mixed-solvent. The guest methanol molecules in the channels of 1 could be replaced by water molecules via a single-crystal-to-single-crystal (SC–SC) process, and the hydrated complex could serve as a host for sensing anions with different geometries which can be conveniently recognized visually. Moreover, the desolvated complex shows selective uptake of CO2 over N2 at ambient temperature.

Mn(II) metal–organic frameworks based on Mn3 clusters: from 2D layer to 3D framework by the “pillaring” approach

Two complexes {[Mn3(btcit)2(H2O)2(DMF)2]·2DMF}∞ (1) and {[Mn3(btcit)2(bib)2]·2DMF}∞ (2) (H3btcit = 4,4′,4′′-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoic acid, bib = 1,4-bis(imidazol-1-yl)benzene) were obtained under the same reaction condition. Complex 1 is a two dimensional (4,4) network constructed from linear Mn3 units and btcit ligands. Complex 2, which presents an interesting two-fold interpenetrating three dimensional framework with fsf topology, was obtained by modifying complex 1 with a “pillaring” approach. Moreover, the magnetic properties of 1 and 2 have been investigated and both of them show antiferromagnetic behaviour.

Zn(II)-Benzotriazolate Clusters Based Amide Functionalized Porous Coordination Polymers with High CO2 Adsorption Selectivity

Two new porous coordination polymers (PCPs) based on different nanosized C3 symmetry ligands and Zn(II)-benzotriazolate clusters have been synthesized solvothermally. Both of the desolvated complexes show selective uptake of CO2 over CH4 and N2 at ambient temperature.

Solvent-induced structural diversities from discrete cup-shaped Co8 clusters to Co8 cluster-based chains accompanied by in situ ligand conversion

Solvent induced structural diversities from a cup-shaped Co8 cluster (1) in methanol to a Co8 cluster-based co-crystal chain (2) in ethanol/n-propanol and a Co8 cluster-based chain (3) in n-butanol under the same stoichiometric ratio of reactants have been reported. In situ ligand conversion has taken place and the new ligand is captured within the metallic core. Magnetic analyses indicate that theses complexes exhibit distinct magnetic behaviours at low temperature.