Guanghua Li

Enhanced Binding Affinity, Remarkable Selectivity, and High Capacity of CO2 by Dual Functionalization of a rht‐Type Metal–Organic Framework

This work was supported by the Foundation of the National Natural Science Foundation of China (grant numbers 20971054 and 90922034) and the Key Project of the Chinese Ministry of Education. The RU and UTD teams would like to acknowledge support from DOE (grant number DE-FG02-08ER46491). We thank Prof. Xianhe Bu and Dr. Ze Chang (Nankai University, China) and Dr. Ruiping Chen (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences) for part of the gas adsorption measurements.

From Metal−Organic Squares to Porous Zeolite-like Supramolecular Assemblies

We report the synthesis, structure, and characterization of two novel porous zeolite-like supramolecular assemblies, ZSA-1 and ZSA-2, having zeolite gis and rho topologies, respectively. The two compounds were assembled from functional metal-organic squares (MOSs) via directional hydrogen-bonding interactions and exhibited permanent microporosity and thermal stability up to 300 °C.

An N-rich metal–organic framework with an rht topology: high CO2 and C2 hydrocarbons uptake and selective capture from CH4

We report the storage capacities and separation selectivity of an rht-type s-heptazine-based metal organic framework (MOF), [Cu3(TDPAH)(H2O)3]·13H2O·8DMA, 1, (where TDPAH is 2,5,8-tris(3,5-dicarboxylphenylamino)-s-heptazine and DMA is N,N-dimethylacetamide) for C2 hydrocarbons and CO2 over CH4. MOF 1 displays the highest C2H2/CH4 selectivity of 80.9 as well as record high C2H4 and C2H6 adsorption enthalpies. Theoretical calculations reveal that s-heptazine and NH groups within the framework have synergistic effects on CO2 binding.

Construction of a microporous inorganic-organic hybrid compound with uranyl units.

A uranium-nickel-organic hybrid compound with micropores has been assembled from a hydrothermal system, and this compound exhibits photocatalytic activities for the degradation of methyl blue as a model pollutant.

Assembly of two 3-D metal–organic frameworks from Cd(II) and 4,5-imidazoledicarboxylic acid or 2-ethyl-4,5-imidazoledicarboxylic acid

Two new metal–organic frameworks [Cd3(H2O)2(C5N2O4H)2·H2O] 1 and [KCd(C7N2O4H5)] 2 have been hydrothermally synthesized employing 4,5-imidazoledicarboxylic acid (IMDC) and 2-ethyl-4,5-imidazoledicarboxylic acid (2-EtIMDC) as organic ligands. The single-crystal structure analysis reveals that compound 1 exhibits a 3-D framework, which is generated from 2-D layers pillared by 1-D chains along the c-axis. Compound 2 presents a 3-D structure with 1-D channels, which are connected in a cross-like fashion by [CdN2O3] trigonal bipyramid units and 2-EtIMDC ligands.

A Germanate Built from a 68126 Cavity Cotemplated by an (H2O)16 Cluster and 2‐Methylpiperazine

Totally tubular: A new tubular germanate is cotemplated by 2-methylpiperazine and an (H2O)16 cluster in a hydro(solvo)thermal synthesis. The germanate features a large, highly symmetric 68126 cavity (see picture; yellow sphere) built from 12 Ge7X19 (X=O, OH, F) clusters (GeX6 red, GeX5 yellow, GeX4 green).

Coordination polymers constructed by 1,3-bi(4-pyridyl)propane with four different conformations and 2,2′-dinitro-4,4′-biphenyldicarboxylate ligands: the effects of metal ions

Five coordination polymers, [Mn2(NBPDC)2(bpp)]n (1), [Co4(NBPDC)4(bpp)2(H2O)5.25]n (2), [Ni(NBPDC)(bpp)(H2O)2]n (3), [Zn(NBPDC)(bpp)]n (4) and [Cd2(NBPDC)2(bpp)]n (5) (NBPDC = 2,2′-dinitro-4,4′-biphenyldicarboxyl acid, bpp = 1,3-bi(4-pyridyl)propane), have been prepared and structurally characterized. In these compounds, NBPDC and bpp exhibit different coordination modes tuned by different metal ions, and construct various architectures by bridging a variety of inorganic building units. Compound 1 presents a hex net with point symbol for net: {36.418.53.6}. Compound 2 shows a self-penetrating ilc topology by linking Co4 clusters with NBPDC and bpp. Compound 3 presents a 2D structure with (4, 4) topology. Compound 4 shows a diamond network with a 5-fold interpenetrating architecture, featuring left-handed and right-handed helix chains. Compound 5 presents a pcu topology by linking rod-shaped secondary building units. The magnetic properties of compounds 1 and 2 have been characterized.

Host–Guest Chirality Interplay: A Mutually Induced Formation of a Chiral ZMOF and Its Double-Helix Polymer Guests

A novel homochiral zeolite-like metal-organic framework (ZMOF), [(Cu4I4) (dabco)2]·[Cu2(bbimb)]·3DMF (JLU-Liu23, dabco =1,4-diazabicyclo[2.2.2]-octane, H2bbimb =1,3-bis(2-benzimidazol)benzene, DMF = N,N-dimethylformamide), has been successfully constructed to host unprecedented DNA-like [Cu2(bbimb)]n polymers with double-helicity. The host-guest chirality interplay permitted the induced formation of an unusual gyroid MOF with homochirality and helical channels in the framework for the first time, JLU-Liu23. Importantly, the enantiomeric pairs (23P, 23M) can be promoted and isolated in the presence of appropriate chiral inducing agents, affording enantioselective separation of chiral molecules as well as small gas molecules.

Hydrothermal synthesis and structural characterization of an organically-templated zincophosphite: [ C 4 N 2 H 12 ] 0.5 ·[ Zn 3 ( HPO 3 ) 4 ]· H 3 O

Abstract A new three-dimensional organically templated [C4N2H12]0.5·[Zn3(HPO3)4]·H3O was hydrothermally synthesized and characterized by single crystal X-ray diffraction. The three-dimensional framework is built up from two-dimensional layers with 4.8-membered rings and one-dimensional chains of 4-membered rings. The structure has strictly alternating ZnO4 tetrahedra and HPO3 pseudo pyramids which are linked through their vertices giving rise to the three-dimensional architecture with 8,12-membered ring channels. The protonated water molecules and diprotonated piperazine are located in the 8-membered and 12-membered channels, respectively. The compound crystallizes in monoclinic system, space group P21/n with cell parameters, a=9.6739(16) A , b=8.4528(13) A , c=20.257(4) A , β=97.966(5)°, Z=4, R=0.023, and Rw=0.060. It was characterized by the powder X-ray diffraction, differential thermal-thermogravimetric analyses, IR spectroscopy and proton-decoupled 31P MAS NMR solid-state spectroscopy.

Hydrothermal synthesis and characterization of metal–organic networks with helical units in a mixed ligand system

Hydrothermal reactions between mixed ligands (4,4′-oxybis(benzoate) and 1,3-bis(4-pyridyl)propane) and Co(NO3)2·6H2O afford two novel helical metal–organic networks Co(C14H8O5)(C13H14N2) 1 and Co(C14H8O5)(C13H14N2)·H2O 2. Compound 1 has a 2-D layer network and the main body of the layer is composed of alternate right-handed and left-handed helical chains by sharing cobalt ions. The distance of the repeating parts of the helical chains is ca. 10.0 A and the size of the helical channels is ca. 7.0 × 7.0 A. In contrast, compound 2 has a 2-D interpenetrated double-layer network and each monolayer is composed of homochiral helical chains by sharing cobalt ions. The distance of the repeating parts of the helical chains is ca. 12.1 A and the size of the helical channels is ca. 7.0 × 7.0 A. Interestingly, each helical chain of 2 is constructed by alternate (4,4′-oxybis(benzoate) and 1,3-bis(4-pyridyl)propane) and cobalt ions. Moreover, two independent monolayers constructing a double-layer are assembled in a homochiral fashion and adjacent double-layers exhibit opposite chirality. The magnetism analysis indicated that compounds 1 and 2 show antiferromagnetic exchange interaction.