Search

Two three-dimensional frameworks based on the {P 4 Mo 6 } unit, H(4,4'-bipy) 2 [Fe 4 (PO 4 )(H 2 O) 4 Na 6 ][Fe 6 (H 2 O) 4 ][(Mo 6 O 12 )(HPO 4 ) 3 (PO 4 )(OH) 3 ] 4 ·5H 2 O (4,4'-bipy = 4,4'-bipyridine) (1) and H 3 (C 12 H 14 N 2 ) 4 [Fe 4 (PO 4 )(H 2 O) 4 Na 4 ][Fe 2 (Mo 6 O 12 (HPO 4 ) 3 (PO 4 )(OH) 3 ) 4 ]·6H 2 O (2) were successfully synthesized by varying the solvent. The extended structures of the two compounds were formed by transition metal Fe(II) ions bridging the {P 4 Mo 6 }-based tetrameric clusters around [Na X Fe 4 (PO 4 )] ( X = 6 (1), or X = 4 (2)) core. The 4,4'-bipy molecules and in situ generated methyl viologen cations as templates induce the formation of two three-dimensional structures, an 8-connected bcu topology framework for 1 and a 4-connected 2-fold interpenetrating diamond-like topological network for 2, respectively. Additionally, multiform hydrogen bonds are found in the framework and also play an important role in stabilizing the structure. The proton conduction mechanism of the two compounds can be mainly classified as the Grotthuss mechanism; the proton conductivity values are 1.06 × 10 -3 S cm -1 for 1 and 3.13 × 10 -3 S cm -1 for 2 at 75 °C under 98% relative humidity. The visible-light photocatalytic activity was evaluated by photocatalytic decomposition of Cr(VI) and MB dye, and the removal ratios can reach 95.6% (1) and 82% (2) for Cr(VI), and 98% (1) and 99% (2) for MB.

A novel three-dimensional metal-organic framework [Ni 3 (BTC) 2 (bpp) 2 (H 2 O)]·3H 2 O (1) based on mixed ligands H 3 BTC (1,2,4-benzenetricarboxylic acid) and bpp (1,3-bis(4-pyridyl)propane) was obtained under hydrothermal conditions. Crystal structure analysis reveals that 1 is a framework based on cage-like Ni 8 (COO) 12 units. Furthermore, long-range magnetic ordering is observed at low temperature.

A cobalt-1,4-naphthalenedicarboxylic acid system in a systematic series of ionic liquids with different alkyl chain lengths of imidazolium cations governed the construction of four MOFs with regular changes of secondary building units (SBUs).

Geminal dicationic ionic liquids with different alkyl spacer lengths regularly tune four MOF structures of two structure types in the Ni(Ac)2-1,4-H2NDC system, which in turn bring about the magnetic properties divided into antiferromagnetic and ferromagnetic couplings consistent with the structures.

A series of 3D homochiral manganese-lanthanide frameworks have been synthesized based on chiral camphoric acid. In the heterometallic features, D-camphoric acids are unprecedentedly embedded in three coordination modes.

A 2D Wells-Dawson-based silver(I) coordination polymer was achieved based on silver-Schiff base building blocks and [P(2)Mo(18)O(62)](6-) clusters using AgNO(3), N,N'-bis(furan-2-ylmethylene)hydrazine and Keggin [PMo(12)O(40)](3-) as original materials at room temperature. It is structurally characterized by IR spectroscopy, (31)P NMR, XRPD, thermogravimetric (TG) analyses and X-ray crystallography. The structure of 1 exhibits a novel crystalline 2D coordination polymer constructed by the coordination interaction between the Wells-Dawson polyoxoanion [P(2)Mo(18)O(62)](6-) and Ag-L species. The luminescent property of 1 in the solid state is investigated.

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.

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.

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.