共查询到20条相似文献,搜索用时 15 毫秒
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Anusree Viswanath Kuttatheyil Marcel Handke Jens Bergmann Dr. Daniel Lässig Dr. Jörg Lincke Prof. Dr. Jürgen Haase Dr. Marko Bertmer Prof. Dr. Harald Krautscheid 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(3):1118-1124
Spectroscopic techniques are a powerful tool for structure determination, especially if single‐crystal material is unavailable. 113Cd solid‐state NMR is easy to measure and is a highly sensitive probe because the coordination number, the nature of coordinating groups, and the geometry around the metal ion is reflected by the isotropic chemical shift and the chemical‐shift anisotropy. Here, a detailed investigation of a series of 27 cadmium coordination polymers by 113Cd solid‐state NMR is reported. The results obtained demonstrate that 113Cd NMR is a very sensitive tool to characterize the cadmium environment, also in non‐single‐crystal materials. Furthermore, this method allows the observation of guest‐induced phase transitions supporting understanding of the structural flexibility of coordination frameworks. 相似文献
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Xiu‐Ying Wang Long Xu Rui‐Bin Liu Shu‐Qin Liu Wen‐Bo Yang Prof. Dr. Jian‐Jun Zhang 《无机化学与普通化学杂志》2012,638(6):1006-1011
A rigid imidazolate/sulfonate functionalized ligand, 6‐(4‐sulfonatopheny)imidazo[4, 5‐f]isoindole‐5, 7‐dione (SPID) was designed and used for assembling reactions with Mn2+ and Cu2+ ions. Two 2D frameworks compounds, [Mn(H‐1SPID)2(DMAC)2] ( 1 ) and [Cu(H‐2SPID)(H2O)2] · 0.7DMAC · 0.3H2O ( 2 ) (DMAC = N,N‐dimethylacetamide) were obtained. Single crystal X‐ray analyses show that 1 has a 2D (4, 4)‐net based on 4‐connected Mn2+ nodes and μ2‐coordinated H‐1SPID spacers, whereas compound 2 has a 2D (6, 3)‐net built of 3‐connected Cu2+ nodes and μ3‐coordinated H‐2SPID spacers. Additionally, the thermal behavior of 1 and 2 is presented. 相似文献
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A new one‐dimensional double‐chain HgII coordination polymer containing the ligand 3,5‐bis(4‐pyridyl)‐4‐amino‐1,2,4‐triazole (bpatrz) and thiocyanate anions, namely, {[Hg2(μ‐bpatrz)(μ‐SCN)2(SCN)2] · MeOH}n ( 1 ), has been synthesized and structurally characterized by single‐crystal X‐ray diffraction. Compound 1 displays bright blue luminescence with emission maxima around 370 and 440 nm in solution and the solid state, respectively. Uptake and release of MeOH by 1 were investigated by powder X‐ray diffraction, thermogravimetric analysis, elemental analysis, and IR and NMR spectroscopy. 相似文献
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A series of metal coordination polymers, [Co2(NB)4(bpp)2(H2O)]·H2O ( 1 ), [Co2(e,e‐trans‐chdc)(e,a‐cis‐chdc)(bpp)2] ( 2 ), [Ni(e,e‐trans‐chdc)(bpp)(H2O)2] ( 3 ), [Ni2(PDA)2(bpp)2(H2O)3]·H2O ( 4 ), and [Ni‐(mBDC)(bpp)] ( 5 ) (NB = 3‐nitrobenzoate anion; bpp = 4,4′‐trimethylene dipyridine; chdc = cyclohexane‐1,4‐dicarboxylate anion; PDA = 1,4‐phenylenediacetate anion; mBDC = 1,3‐benzene dicarboxylate anion), were synthesized from metal ions and organic mixed‐ligands by hydrothermal reactions. The single crystal structure analysis revealed that 1, 3, and 4 were 2D sheets with bilayer (1 and 4) and 2‐fold interpenetrated layers (3), 2 is a 3D binodal (4,5)‐connected framework, and 5 is a 1D chains. The non‐covalent interactions of H‐bonds and π–π stacking caused this conformation of highly cross‐linked networks. Compounds 1‐5 were further characterized by thermal gravimetric analysis, powder X‐ray diffraction, UV‐vis, infrared, and PL spectroscopy. 相似文献
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Two CdII/CoII‐Imidazolate Coordination Polymers: Syntheses,Crystal Structures,Stabilities, and Luminescent/Magnetic Properties 下载免费PDF全文
Suvendu Sekhar Mondal Karsten Behrens Alexandra Kelling Hans‐Peter Nabein Uwe Schilde Hans‐Jürgen Holdt 《无机化学与普通化学杂志》2015,641(11):1991-1997
Cadmium(II) based 2D coordination polymer [Cd(L1)2(DMF)2] ( 1 ) (L1 = 4,5‐dicyano‐2‐methylimidazolate, DMF = N,N′‐dimethylformamide) and 2D cobalt(II)‐imidazolate framework [Co(L3)4] ( 2 ) (L3 = 4,5‐diamide‐2‐ethoxyimidazolate) were synthesized under solvothermal reaction conditions. The materials were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X‐ray diffraction measurement (PXRD) and single‐crystal X‐ray diffraction. Compound 1 has hexacoordinate CdII ions and forms a zigzag chain‐like coordination polymer structure, whereas compound 2 exhibits a 2D square grid type structure. The thermal stability analysis reveals that 2 showed an exceptional thermal stability up to 360 °C. Also, 2 maintained its fully crystalline integrity in boiling water as confirmed by PXRD. The solid state luminescent property of 1 was not observed at room temperature. Compound 2 showed an independent high spin central CoII atom. 相似文献
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Two new cobalt(II) coordination polymers, [Co(PDCO)(H2O)2]n ( 1 ) and [Co(PDCO)(bix)(2H2O)2·H2O]n ( 2 ) ( PDCO= pyridine‐2,6‐dicarboxylic acid N‐oxide, bix = 1,4‐bis(imidazol‐1‐ylmethyl)‐benzene) have been synthesized under hydrothermal conditions. Single‐crystal X‐ray analyses show that compound 1 is a 1D helical chainlike structure with 41 screw axes parallel to the crystallographic c‐axis and interchain hydrogen‐bonding interactions further result in a 3D framework; for compound 2 , each bix ligand connects two Co1 atoms (or two Co2 atoms) to give a zigzag chain structure and these 1D chains are connected by offset face‐to‐face π···π and hydrogen bond interactions to generate a 3D architecture. The thermogravimetric analyses were investigated for 1 and 2 . The determination of variable temperature magnetic susceptibilities indicates an antiferromagnetic interaction between the metal atoms for 1 and 2 . 相似文献
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Kumar Biradha Corey Seward Michael J. Zaworotko 《Angewandte Chemie (International ed. in English)》1999,38(4):492-495
A quarter of the unit cell volume of [{Ni(4,4′‐dipy)(3‐nitrobenzoate)2(MeOH)2}n], which crystallizes in the form of helices, is occupied by large chiral cavities (400–500 Å3). The cavities are capable of encapsulating not only single molecules, but also face‐to‐face dimers of nitrobenzene (see stick model). 4,4′‐dipy=4,4′‐bipyridine. 相似文献
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A significant challenge in the development of porous coordination polymers (PCP's), beyond control of pore size, is control of the shape and chemical nature of the pores. This short review presents some compounds that illustrate these features and general approaches to their preparation. 相似文献
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Yu Xian Shu Yun Niu Prof. Jing Jin Li Ping Sun Guang Di Yang Ling Ye 《无机化学与普通化学杂志》2007,633(8):1274-1278
Three cadmium(II) coordination polymers [Cd(NA)2(H2O)2]n ( 1 ), {[Cd(NA)(phen)(NO3)]·(H2O)1/2}n ( 2 ), {[Cd(NA)(CH3C6H4COO)(H2O)2]·(CH3C6H4COOH)}n ( 3 ) (HNA = nicotinic acid, phen = 1, 10‐phenanthroline) have been synthesized by hydrothermal method. Their single‐crystal structures were determined by X‐ray diffractometry. The absorption, excitation and emission spectra were investigated and all the complexes emit strong fluorescence: λemmax = 544 nm (λex = 492 nm), 1 ; λemmax = 466 nm (λex = 393 nm), 2 ; λemmax = 430 nm (λex = 313 nm), 3 . At room temperature in the solid state the fluorescence lifetimes of the complexes were investigated and the relationships between the spectra were discussed as well as the connections of luminescence and crystal structures. 相似文献
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Pamela J. Hagrman Douglas Hagrman Jon Zubieta 《Angewandte Chemie (International ed. in English)》1999,38(18):2638-2684
A blueprint for the design of oxide materials is provided by nature. By borrowing from nature's ability to influence inorganic microstructures in biomineralization processes and in the hydrothermal synthesis of complex minerals, a new class of materials in which organic components exert a role in controlling inorganic microstructure is evolving. By employing members of the ever-expanding class of polymeric coordination complex cations, novel molybdenum oxide substructures, such as the one shown, may be prepared. 相似文献
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Reaction of Mn(NCS)2 with 4-picoline (4-methylpyridine) leads to the formation of [Mn(NCS)2(4-picoline)4] · 0.67 · 4-picoline · 0.33 · H2O ( 1 - Mn ) reported in literature, Mn(NCS)2(4-picoline)2(H2O)2 ( 2-Mn/H2O ), and of [Mn(NCS)2(4-picoline)2]n ( 2-Mn/I ). 1-Mn and 2-Mn/H2O consist of discrete complexes, in which the metal cations are octahedrally coordinated, whereas in 2-Mn/I the metal cations are linked by pairs of μ-1,3-bridging thiocyanate anions into corrugated chains. Measurements using thermogravimetry and differential scanning calorimetry as well as temperature dependent X-ray powder diffraction on 1-Mn and 2-Mn/H2O reveal that upon heating both compounds transform into [Mn(NCS)2(4-picoline)]n ( 3-Mn ) via 2-Mn/I as intermediate. 3-Mn shows a very rare chain topology in which the metal cations are linked by μ-1,3,3 (N,S,S) coordinating anionic ligands which was never observed before with MnII. From these investigations there is no hint that a further modification of 2-Mn can be prepared as recently observed for [M(NCS)2(4-picoline)2]n (M = Fe, Cd) and such a form is also not available if the metastable forms of the FeII or CdII compounds were used as template during thermal decomposition. Magnetic investigations on 2-Mn/H2O show only paramagnetic behavior, whereas for 2-Mn/I antiferromagnetic ordering is observed. Finally, the crystal structure of Mn(NCS)2 was determined from XRPD data, which shows that it is strongly related to that of 3-Mn . 相似文献
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A novel energetic microporous metal‐organic coordination polymer {[Ni(tnbpdc)(bpy)(H2O)2] · 1.5(DMF)}n ( 1 ) (tnbpdc = 2, 2′,6, 6′‐tetranitro‐4, 4′‐biphenyl dicarboxylate, bpy = 4, 4′‐bipyridine) was prepared solvothermally and characterized by elemental, IR spectroscopic, and single‐crystal X‐ray diffraction analyses. The X‐ray crystal structure of 1 revealed a rectangular‐shaped grid constructed with tnbpdc linkers and bpy linkers, with the free tunnel size estimated as 11 × 15 Å2. The thermal stability of the compound was evaluated by differential scanning calorimetry and thermogravimetric analysis. Such complexes may find application as novel heat‐resistant energetic materials. 相似文献
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Jingli Xie 《无机化学与普通化学杂志》2009,635(2):384-388
A new two‐dimensional metal‐organic framework [Zn(bqdc)]n (bqdc = 2,2′‐biquinoline‐4,4′‐dicarboxylate) was obtained by the reaction of ligand 2,2′‐biquinoline‐4,4′‐dicarboxylic acid (H2bqdc) and Zn(CH3COO)2·2H2O under hydrothermal conditions. It has been characterized by elemental analysis, FT‐IR, 1H‐NMR and single crystal X‐ray crystallography. It crystallizes in the monoclinic space group P21/n and exhibits a 2D zig‐zag network, assisted by face‐to‐face π‐π interactions of quinoline rings. In addition, it has a fluorescence emission in the solution state at room temperature. 相似文献
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The first two‐dimensional lanthanum(III) coordination polymer, [La(1,5‐NDS)1.5(H2O)5]n (1) (1,5‐NDS2? = 1,5‐naphthalenedisulfonate), was synthesized and structurally characterized by single‐crystal X‐ray diffraction analysis. The disulfonate ligands act in the η1:η1:μ2 and η1:η1:η1:μ3 binding modes to link the LaO9 tricapped trigonal prisms into a lamellar structure. It exhibits strong purple emission in the solid state. 相似文献
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Neil R. Champness Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(13):2274-2275
Sphere of destiny : Metal–organic spheres with remarkable encapsulation properties are readily prepared and their ability to host a wide range of guest species, including nanoparticles, fluorescent dyes, and quantum dots, is demonstrated. Both the metal–organic spheres and the encapsulated species maintain their fluorescent or magnetic properties, highlighting the importance of these systems as new multifunctional materials.