An ionic porous coordination polymer possessing partially exposed uncoordinated nitrogens exhibits strong interaction with CO and high CO/CH selectivity, and the adsorption mechanism is illustrated by the structure of its CO-loaded single-crystal.

Jianbin Lin    Xue Wei    Jiepeng Zhang    陈小明    

Chemical Communications

2011

A microporous coordination polymer, namely, [Co(ina) (OH)(CHOH)](NO) · CHOH· (HO) (1, or MCF-38, ina = isonicotinate), with 8-connected {Co(OH)} clusters as the structural secondary building units, has been solvothermally synthesized. The hydroxo-centered Co(II) cluster involves multiple active metal sites. The interesting apical ligand substitutions have been directly observed, and the corresponding products of [Co(ina)(OH)(G) (HO)](NO) · G· (HO) (1 ⊃ PrOH, G = PrOH, x = 2, n =1, m = 3; 1 ⊃ BuOH, G = BuOH, x = 2, n = 1, m = 1, and 1 ⊃ MeOH,G = MeOH, x = 3, n = 0, m = 7) have also been obtained by solvothermal syntheses or crystal-to-crystal transformations. High-pressure H adsorption measurement at 77 K reveals that activated 1 can absorb 2.2 wt % H at 5 bar. Therelative H absorption at low pressure (86% of the storage capacity at 1 bar) is higher than the corresponding values reported for some typical porous coordination polymers. The magnetic studies of 1 show a dominant antiferromagnetic coupling between Co(II) ions of intra-and inter-cluster. © 2011 American Chemical Society.

Chen Qing    Jianbin Lin    Xue Wei    Minghua Zeng    陈小明    

Inorganic Chemistry

2011

By treating M(NO) or MCl (M = Mn, Fe, Co and Ni) with 2,6-naphthalene dicarboxylic acid (ndcH), a series of metal-carboxylate frameworks have been solvothermally synthesized under the same route with different buffering anions, which feature two kinds of frameworks based on slightly different linear M(OOCR) secondary building units: [M(ndc)(DMF)] (M = Mn, Fe and Co) or [M(ndc)(DMF)(MeNH) ] (M = Co and Ni). Consequently, the two cobalt compounds exhibit different magnetic behaviours. © 2011 The Royal Society of Chemistry.

Wang Xiao-Feng    Yuebiao Zhang    Zhang Wei-Xiong    Xue Wei    Zhou Hao-Long    陈小明    

CrystEngComm

2011

Haibing Xu    Zhong Ye-Teng    Zhang Wei-Xiong    陈忠宁    陈小明    

Dalton Transactions

2011

Heterotrinuclear ZnLn (Ln = Nd 2, Eu 3, Tb 4, Er 5, Yb 6) clusters [(Znq)](μ-CHCOO){Ln(hfac) } (q = 8-hydroxylquinolinate, hfac = hexafluoroacetylacetonate) have been synthesized. The ZnLn framework is ligated by two q ligands featuring μ-phenoxo and two q ligands featuring μ-phenoxo coordination modes, and one μ-CHCOO anions. Since the short intramolecular separations of Zn⋯Ln (ca. 3.354-3.373 Å) allow energy transfer from Znq-based sensitizers to the Ln centres through two energy transfer pathways, the lanthanide luminescence is indeed "lighted up" by excitation of the Znq -based chromopores. Photophysical measurements revealed that these ZnLn complexes exhibit the so-called "dual emission" originating from both Znq-based luminophores and lanthanide emitters. By virtue of the dual luminescence with complementary colours, the Znq-based cyan emission and Eu-centred red luminescence are combined to generate a white-light emission in the Zn Eu (3) complex. © 2010 The Royal Society of Chemistry.

Haibing Xu    Zhong Ye-Teng    Weixiong Zhang    陈忠宁    陈小明    

Dalton Transactions

2010

To overcome the shortcomings of wired temperature and humidity measurement system, a temperature and humidity measuremet system based on wireless sensor networks was designed. the components of the system and its working principle were described in detail. Its nodes use a digital temperature and humidity sensor SHT15 for data collection, wireless transmission chip CC1100e for data short-range wireless transceiver and the wireless network, and AT89S52 microcontroller for controlling core. Nodes communicate with the background host through serial interfaces. The system can achieve environmental temperature and humidity dynamically and comprehensive real-time monitoring. Node has a dual function as terminals and routers, in addition to data processing, but also for other nodes to forward the temperature and humidity data storage, management, and integration, and taking in collaboration with other nodes to complete some specific tasks. The system has some advantages such as low cost, low power consumption and small size, which has a good application prospects. © 2010 Trans Tech Publications.

陈小明    

Key Engineering Materials

2010

A pair of structurally isomeric metal-carboxylate frameworks (MCFs) with an identical formula of [MeNH][Co (1,4-bdc)]·4DMF (1 and 2, MeNH = protonated dimethylamine, 1,4-bdcH = 1,4-benzenedicarboxylic acid and DMF = N,N′-dimethylformamide) have been synthesized from identical reactants at 160 °C and room temperature, respectively. Although both compounds feature the same bcg net (a uninodal eight-connected net) based on the Co(OOCR) clusters as eight-connected nodes, the isomers exhibit different magnetic behaviours, owing to the slight difference of linear Co(OOCR) clusters. © 2010 The Royal Society of Chemistry.

Wang Xiao-Feng    Yuebiao Zhang    Xue Wei    Qi Xiao-Lin    陈小明    

CrystEngComm

2010

Solvothermal reactions of 1,3,5-benzenetricarboxylic acid (H btc) with cadmium acetate or zinc acetate yielded two compounds formulated as (MeNH)[Cd(btc)]•DMA (1) (btc = 1,3,5-benzenetricarboxylate, DMA = N,N-dimethylacetamide) and (Me NH)[Zn(btc)]•DMF (2) (DMF = N,N-dimethylformamide). Both are 3-D frameworks with the rutile topology, which are constructed from six-connected dimeric metal cores and three-connected btc linkers. The solvent molecules and counter cations are located in the 1-D channels of the frameworks. A slight difference between the two compounds is the different connectivity modes of the metal atoms with the carboxylate groups of the ligands. However, this slight difference results in distinct flexibilities of the two frameworks. Variable-temperature powder X-ray diffraction studies revealed that the framework of 1 collapses when heated at 180 °C with loss of the guest species, but compound 2 undergoes two structural transformations below 380 °C. Thermogravimetry-infrared spectroscopy analysis for 2 showed that the two structural transformations are induced by separate losses of solvent molecules and counter cations, and that the dimethylammonium cations are eliminated as neutral dimethylamine molecules. IR spectroscopy demonstrated that the protons are transferred from the counter cations onto the uncoordinated carboxylate oxygen atoms on the channel walls. Sorption and proton conduction studies have also been performed for the compounds. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg.

Linhua Xie    Jianbin Lin    Xiaomin Liu    Xue Wei    Weixiong Zhang    Shuxia Liu    Jiepeng Zhang    陈小明    

Science China Chemistry

2010

Reactions of 3-(2-pyridyl)-5-(4-pyridyl)-1,2,4-trlazole (Hdpt24) with Mn(OAc) under different conditions give two mononuclear complexes, [Mn(dpt24)(MeOH)] (1) and [Mn(dpt24)(H 0)]·6H0 (2), and three Isomeric twodimensional (2D) coordination polymers α-[Mn(dpt24)] (3a), β-[Mn(dpt24)]·g (3b·g, g = DMF and H O), and γ-[Mn(dpt24)]· g (3c · g, g = toluene and MeOH). Their structures were characterized by single-crystal and powder X-ray diffractions. In these compounds, four coordination sites of each octahedrally coordinated Mn ion are chelated by two dpt24 ligands in the trans and/or cis configurations. While the two remaining coordination sites are occupied by solvent molecules In 1 and 2, they are occupied by pyrldyl nitrogens from neighboring Mn(dpt24) units In 3, forming 4-connected 2D (4,4) networks. The Mnons in both 3a and 3b are uniquely chelated by dpt24 in the trans or cis configurations, respectively, but Mn(dpt24) in 3c possesses both the trans and cis configurations. The packing fashions of these (4,4) layers in the three Isomers of 3 are also different, in which 3a has a close packing structure, while 3b exhibits unique one-dimensional (1 D) channels and 3c exhibits two distinct types of 1D channels. As revealed by powder X-ray diffractions, crystals of 1 and 2 can reversibly transform to each other when in contact with the corresponding solvent vapor (H0/MeOH). The gas and vapor sorption studies for porous 3b revealed Interesting sorption behaviors. Nitrogen adsorption for 3b was observed at 195 K rather than 77 K, demonstrating the temperature-controlled framework flexibility. It also exhibited high selectivity and storage capacity for carbon dioxide over methane and nitrogen at room temperature. Moreover, 3b also demonstrated potential to separate organic chemicals with similar boiling points, such as benzene and cyclohexane, via pressure swing adsorption process. © 2009 American Chemical Society.

Jianbin Lin    Jiepeng Zhang    Weixiong Zhang    Xue Wei    Dongxu Xue    陈小明    

Inorganic Chemistry

2009

Nine new coordination polymers: [Cu3(ipO)2(pyz) 2] (5), [Cu3(ipO)2(4-phpy)(H2O) 2] (6), [Cu(ip)(4-phpy)2] (7), [Cu3(ipO) 2(H2O)2] (8), [Co(phen)(ip)(H2O)] (9), [Co3(1,2,3-btc)2(4,4′-bpy)2(H 2O)2]·2H2O (10), [Ni(1,2,3-btcH)(4, 4′-bpy)(H2O)]·H2O (11), [Cd 5(1,2,3-btc)2(1,2,3-btcH)2(4,4′-bpy) 3(H2O)2] (12) and (1,2,3-btcH 3)(4,4′-bpy) (13) (1,2,3-btcH3 = 1,2,3-benzenetricarboxylic acid, ipO = 2-hydroxyisophthalate, 4,4′-bpy = 4,4′-bipyridine, pyz = pyrazine, 4-phpy = 4-phenyl-pyridine and phen = o-phenanthroline) have been hydrothermally synthesized. This family of compounds show the role of the N-containing heterocyclic ligands and Cu(ii) ions in the metal-ligand reactions. These results suggest that the hydroxylation requires Cu(ii) ions as the oxidant, rather than the presence of N-containing heterocyclic ligands, while the decarboxylate procedure requires high temperature and basic condition rather than the participation of Cu(ii) ions. The obtained compounds show versatile structures and magnetic properties due to the flexibility of the carboxylate ligands. Compound 5 shows dominated antiferromagnetic interaction in the [Cu2(μ-ipO)2] unit, and no long-range magnetic ordering behaviour. Compound 10 has a topologically ferrimagnetic chain with alternating Co^II octCo^IItetCo^IIoct (oct = octahedral, tet = tetrahedal) spin arrangement. The Co^II tet and Co^IIoct ions are bridged by similar syn-anti carboxylates (Co^IItet⋯Co^II oct 4.616 and 4.735 ). Such a chain shows ferro- and antiferro- magnetic interactions and no long-range magnetic ordering behaviour was observed. Compound 11 has a antiferromagnetic coupled syn-anti carbxylate-bridged Ni(ii) chain (J = 1.48(2) K), and shows long-range magnetic order below 2.6 K due to the extensive hydrogen bonds between the chains. © 2009 The Royal Society of Chemistry.

Yanzhen Zheng    Yuebiao Zhang    童明良    Xue Wei    陈小明    

Dalton Transactions

2009