亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Synthesis, Structure and Luminescent Properties of Cd(II)Coordination Polymers Based on 4-Nitrobenzoic Acid and Bis(imidazol) Ligand①

        2018-05-11 11:20:47LIXiuMeiWANGZhiTaoPANYaRu
        結(jié)構(gòu)化學 2018年4期

        LI Xiu-Mei WANG Zhi-Tao PAN Ya-Ru

        (Faculty of Chemistry, Tonghua Normal University, Tonghua134002, China)

        1 INTRODUCTION

        The designed synthesis and characterization of metal-organic coordination polymers or metalorganic frameworks (MOFs) have gained important progress in supramolecular chemistry and material chemistry[1-8].The increasing interest in this field is justified not only for their particular beauty andintriguing structural diversities of architecture, but also for their potential applications as catalytic,conductive, luminescent, magnetic, spin-transition,non-linear optical or porous functional materials[9-16].The combination of metal ions with neutral and anionic mixed bridging ligands makes the assembly process more controllable than a single ligand.The prospect of introducing the second or more organic ligands into a reaction system provides further impetus for research on metal-organic supramolecular frameworks.The construction of supramolecular architectures through selective and directional non-covalent forces such as hydrogen bonding, π···π and C–H···π interactions inmetal-organic frameworks arouses considerable contemporary interest owing to their potential applications as functional materials.

        The hydrothermal technique is well suited to the preparation of crystals of synthetic minerals, new inorganic materials, and organometallic coordination polymers.Of particular interest to us is the construction of transition metal polymers with new structural features by utilizing hydrothermal synthesis.With this background information, in this work, a new coordination polymers [Cd0.5(nba)(bib)0.5]2n(1) was synthesized based on Hnba and bib ligands.Its synthesis, structure, thermal stability and luminescence properties of complex 1 were studied.

        2 EXPERIMENTAL

        2.1 Materials and instruments

        All the chemicals were of analytical grade and used without further purification.Elemental analyses for C, H and N were performed on an Elementar Vario III Elemental Analyzer.IR spectra were obtained using KBr pellets on a Nicolet 6700 spectrophotometer in the 4000~400 cm-1region.Powder X-ray diffraction (PXRD) patterns were collected in the 2θ range of 5~50o with a scan speed of 0.1 o·s-1on a Bruker D8 Advance instrument using a CuKα radiation (λ = 1.54056 ?) at room temperature.The fluorescent studies were carried out on a computer-controlled JY Fluoro-Max-3 spectrometer at room temperature.TGA was carried out using a Thermal Analyst 2100 TA Instrument and SDT 2960 Simultaneous TGA-DTA Instrument in flowing nitrogen at a heating rate of 10 ℃/min.

        2.2 Synthesis

        A mixture of Hnba (0.033 g, 0.2 mmol), bib (0.038 g, 0.2 mmol), Cd(OAc)2·2H2O (0.053 g, 0.2 mmol)and 18 mL H2O was adjusted to pH ≈ 8 with 40%NaOH, sealed in a Teflon-lined stainless-steel vessel,heated to 120 °C for 5 days, and followed by slow cooling (a descent rate of 5 °C/h) to room temperature.Colorless block crystals were obtained.Yield of 21%.Anal.Calcd.for C24H22CdN6O8: C, 45.40; H, 3.49; N,13.24%.Found: C, 45.00; H, 3.01; N, 13.01%.IR(cm–1): 3125(w), 2938(w), 1568(m), 1511(s),1468(m), 1443(w), 1405(m), 1317(w), 1296(w),1273(w), 1231(m), 1165(w), 1067(w), 1034(w),1011(w), 944(w), 929(w), 877(w), 835(m), 741(m),724(m), 659(w), 623(w), 566(w), 521(w).

        2.3 X-ray crystallography

        All diffraction data of complex 1 were collected on a Bruker/Siemens Smart Apex II CCD diffractometer with graphite-monochromated MoKα radiation (λ =0.71073 ?) at 293(2) K.Data reductions and absorption corrections were performed using the SAINT and SADABS programs, respectively.The structure was solved by direct methods with SHELXS-97 program[17(a)]and refined by full-matrix least-squares techniques on F2with SHELXL-97[17(b)].All non-hydrogen atoms were refined anisotropically and the hydrogen atoms of organic ligands were generated geometrically.A total of 2568 reflections were collected in the range of 1.78≤θ≤26.12°, of which 2426 were independent (Rint=0.0154).The final R = 0.0268 and wR = 0.0683 for observed reflections with I > 2σ(I), and R = 0.0287 and wR = 0.0697 for all data with (Δρ)max= 0.371 and(Δρ)min= –0.371 e·?-3.Selected bond lengths and bond angles of complex 1 are shown in Table 1.

        Table 1. Selected Bond Lengths (?) and Bond Angles (°) for 1

        3 RESULTS AND DISCUSSION

        3.1 Structural description

        Single-crystal X-ray diffraction analysis reveals that complex 1 crystallizes in C2/c space group and consists of a one-dimensional chain-like structure.The coordination environment of Cd(II) in 1 is shown in Fig.1.There are half Cd(II) ion, one nba ligand and half bib molecule in the asymmetric unit.The Cd(1) ion is coordinated by three oxygen atoms from two different nba ligands, one nitrogen atom from bib molecule in the equatorial plane (Cd(1)–O(1)= 2.506(2), Cd(1)–O(1A) = 2.506(2), Cd(1)–O(2) =2.306(2), Cd(1)–N(1) = 2.2303(19) ?) and one oxygen from nba ligand, one nitrogen atom from bib molecule at the axial sites (Cd(1)–O(2A) = 2.320(3),Cd(1)–N(1A) = 2.2303(19) ?), which are in the normal range[18]and the coordination angles round the Cd ion vary from 53.30(8) to 138.25(8)°.

        Fig.1. ORTEP drawing of 1 showing the local coordination environment of Cd(II) with thermal ellipsoids at 30% probability.Symmetry code: (A) –x, y, –z+3/2

        In the crystal structure of complex 1, the wholly deprotonated nba ligands take a bidentate bridging coordination mode and bib molecule adopts a trans-conformation mode with a dihedral angle between two imidazole rings of 0.66o.As a result, the Cd(II) ions are linked by bib ligands to form a one-dimensional zigzag chain structure with the Cd···Cd distance of 13.678 ?, as depicted in Fig.2.The Cd(1) ion shows a distorted octahedral coordination construction.Further analysis of the crystal packing revealed that there are π-π interactions in complex 1 between C(2)C(3)C(4)C(5)C(6)C(7) benzene ring of nba ligand.The centroidto-centroid distance is 3.749(2) ? and perpendicular distance is 3.5442(14) ?, and the dihedral angle is 0°.Therefore, through π-π interactions, the one-dimensional chains are further extended into a threedimensional supramolecular framework (Fig.3).

        Fig.2. View of the one-dimensional zigzag chain in 1

        3

        Fig.3. View of the 3D supramolecular architecture of 1 formed by π-π interactions along the b axis

        3.2 IR analysis of complex 1

        The C–N absorption peaks of imidazole can be observed at 1342 cm-1.Asymmetric and symmetric COO–stretching modes of the lattice nba-anion were evidenced by very strong, slightly broadened bands at 1511 and 1468 cm-1[19], which is consistent with the results of X-ray analysis.

        3.3 Thermal stability and powder X-ray diffraction (PXRD)

        To confirm the phase purity of complex 1, powder X-ray diffraction (PXRD) patterns were recorded for 1, and it was comparable to the corresponding simulated patterns calculated from the single-crystal diffraction data (Fig.4), indicating a pure phase of bulky sample.

        Fig.4. PXRD analysis of the title complex: bottom-simulated, top-experimental

        In order to better understand the thermal stability of complex 1, its thermal decomposition behaviors were investigated at 50~800 ℃ under nitrogen atmosphere (Fig.5).The TG curve of 1 indicates no obvious weight loss from 50 to 334 ℃.The TG curve presents a platform and the framework starts to decompose at 334 ℃.

        3.3 Photoluminescent properties

        The emission spectrum of complex 1 in the solid state at room temperature is exhibited in Fig.6.It can be observed that 1 shows green photoluminescence with an emission maximum at ca.535 nm upon excitation at 325 nm.In order to realize the nature of these emission bands, we first studied the photoluminescence properties of free Hnba (λem= 279 nm)ligand, and proved that it does not emit any luminescence in the range of 400~800 nm.And then we researched the emission spectrum of bib (λem= 325 nm) itself and the result revealed that the main emission peak of bib ligand is at 438 nm, which has also been proved previously.Thus, on the basis of the earlier literature[20,21], the emission band could be tentatively assigned to π*→ π transitions of neutral ligand.

        Fig.5. TG curve of the title complex

        Fig.6. Solid-state emission spectra of 1 and 2 at room temperature

        REFERENCES

        (1) Lehn, J.M.Supramolecular Chemistry, Concepts and Perspectives(VCH, New York 1995).

        (2) Steed, J.W.; Atwood, J.L.Supramolecular Chemistry, Wiley and Sons(New York 2000).

        (3) Holliday, B.J.; Mirkin, C.A.Strategies for the construction of supramolecular compounds through coordination chemistry.Angew.Chem., Int.Ed.2001, 40, 2022–2043.

        (4) Moulton, B.; Zaworotko, M.J.From molecules to crystal engineering: supramolecular isomerism and polymorphism in network solids.Chem.Rev.2001, 101, 1629–1658.

        (5) Li, X.M.; Pan, Y.R.; Zhan, P.Y.; Wang, Q.W.; Liu, B.A new Cd(II) coordination polymer constructed by 3-(2-pyridyl)pyrazole and 5-nitroisophthalic acid: synthesis, crystal structure and theoretical calculations.Chin.J.Struct.Chem.2017, 36, 1609–1616.

        (6) Rao, C.N.R.; Natarajan, S.; Vaidhyanathan, R.Metal carboxylates with open architectures.Angew.Chem.Int.Ed.2004, 43, 1466–1496.

        (7) Kitagawa, S.; Kitaura, R.; Noro, S.I.Functional porous coordination polymers.Angew.Chem.Int.Ed.2004, 43, 2334–2375.

        (8) Hagrman, P.J.; Hagrman, D.; Zubieta, J.Organic-inorganic hybrid materials: from “simple” coordination polymers to organodiamine-templated molybdenum oxides.Angew.Chem., Int.Ed.1999, 38, 2638–2684.

        (9) Han, M.L.; Bai, L.; Tang, P.; Wu, Y.P.; Zhao, J.; Li, D.S.; Wang, Y.Y.Biphenyl-2,4,6,3?,5?-pentacarboxylic acid as a tecton for six new Co(II)coordination polymers: pH and N-donor ligand-dependent assemblies, structure diversities and magnetic properties.Dalton Trans.2015, 44,14673–14685.

        (10) Han, M.L.; Chang, X.H.; Feng, X.; Ma, L.F.; Wang, L.Y.Temperature and pH driven self-assembly of Zn(II) coordination polymers: crystal structures, supramolecular isomerism, and photoluminescence.CrystEngComm.2014, 16, 1687–1695.

        (11) Ma, L.F.; Wang, L.Y.; Wang, Y.Y.; Du, M.; Wang, J.G.Synthesis, structures and properties of Mn(II) coordination frameworks based on R-isophthalate (R = -CH3or -C(CH3)3) and various dipyridyl-type co-ligands.CrystEngComm.2009, 11, 109–117.

        (12) Anokhina, V.; Vougo-Zanda, M.; Wang, X.Q.; Jacobson, A.J.In(OH)BDC·0.75BDCH2(BDC = benzenedicarboxylate), a hybrid inorganic-organic vernier structure.J.Am.Chem.Soc.2005, 127, 15000–15001.

        (13) Wang, X.Q.; Liu, L.M.; Jacobson, A.J.Intercalation of organic molecules into vanadium(IV) benzenedicarboxylate: adsorbate structure and selective absorption of organosulfur compounds.Angew.Chem.Int.Ed.2006, 39, 6499–6503.

        (14) Li, X.J.; Jiang, F.L.; Wu, M.Y.; Zhang, S.Q.; Zhou, Y.F.; Hong, M.C.Self-assembly of discrete M6L8coordination cages based on a conformationally flexible tripodal phosphoric triamide ligand.Inorg.Chem.2012, 51, 4116–4122.

        (15) Li.D.S.; Zhang, P.; Zhao, J.; Fang, Z.F.; Du.M.; Zou, K.; Mu, Y.Q.Two unique entangling CdII-coordination frameworks constructed by square Cd4-building blocks and auxiliary N,N′-donor ligands.Cryst.Growth Des.2012, 12, 1697–1702.

        (16) Pan, L.; Parker, B.; Huang, X.Y.; Olsonet, D.H.; Yong, J.; Li, J.Zn(tbip) (H2tbip = 5-tert-butyl isophthalic acid): a highly stable guest-free microporous metal organic framework with unique gas separation capability.J.Am.Chem.Soc.2006, 128, 4180–4181.

        (17) (a) Sheldrick, G.M.SHELXS 97, Program for the Solution of Crystal Structure.University of G?ttingen, Germany 1997.(b) Sheldrick, G.M.SHELXL 97, Program for the Refinement of Crystal Structure.University of G?ttingen, Germany 1997.

        (18) Qiao, Y.; Wang, X.B.; Zhou, Y.F.; Liu, L.H.; Che, G.B.; Liu, C.B.; Liu, X.T.Hydrothermal syntheses and crystal structures of six complexes constructed from 1,3,5-benzenetricarboxylic acid and 4?-(4-pyridyl)-2,2?:6?,2??-terpyridine mixed ligands.Chin.J.Struct.Chem.2017, 36,1381–1394.

        (19) Devereux, M.; Shea, D.O.; Kellett, A.; McCann, M.; Walsh, M.; Egan, D.; Deegan, C.; K?dziora, K.; Rosair, G.; Müller-Bunz, H.Synthesis, X-ray crystal structures and biomimetic and anticancer activities of novel copper(II)benzoate complexes incorporating 2-(4?-thiazolyl)benzimidazole(thiabendazole), 2-(2-pyridyl)benzimidazole and 1,10-phenanthroline as chelating nitrogen donor ligands.Inorg.Biochem.2007, 101, 881–892.

        (20) Mohamed, G.G.; El-Gamel, N.E.A.Synthesis, investigation and spectroscopic characterization of piroxicam ternary complexes of Fe(II), Fe(III),Co(II), Ni(II), Cu(II) and Zn(II) with glycine and dl-phenylalanine.Spectrochim.Acta,Part A2004, 60, 3141–3154.

        (21) Zhang, X.M.; Tong, M.L.; Gong, M.L.; Chen, X.M.Supramolecular organisation of polymeric coordination chains into a three-dimensional network with nanosized channels that clathrate large organic molecules.Eur.J.Inorg.Chem.2003, 1, 138–142.

        国产熟女露脸大叫高潮| 亚洲国产成人va在线观看天堂| 日日摸夜夜添夜夜添无码免费视频| 亚洲天堂二区三区三州| 成人午夜福利视频后入| 亚洲中文字幕无码永久在线| 亚洲国产精品综合久久20 | 亚洲国产美女在线观看| 国产精品农村妇女一区二区三区| 国语对白福利在线观看 | 国产日韩AV无码免费一区二区 | 男男亚洲av无一区二区三区久久| 午夜裸体性播放| 久久精品国产9久久综合| 91自国产精品中文字幕| 日本超级老熟女影音播放| 亚洲精品无码久久久久去q| 久久中文字幕av一区二区不卡| 国产大陆av一区二区三区| 日本熟女精品一区二区三区| 久久不见久久见中文字幕免费| 成人免费xxxxx在线视频| 国产蜜臀精品一区二区三区| 亚洲精品国产av成人精品| 四虎影视免费观看高清视频| 亚洲都市校园激情另类| 国产一区二区视频在线看| 天天做天天添av国产亚洲| 国产三级在线观看免费| 国产精品麻豆A在线播放| 国产成人高清在线观看视频| 国产成人精品白浆久久69| 久久青草伊人精品| 日本一区二区高清视频在线| 男吃奶玩乳尖高潮视频| 色翁荡息又大又硬又粗又视频图片| 99亚洲乱人伦精品| 黄色一区二区三区大全观看| 97夜夜澡人人双人人人喊| 亚洲熟妇乱子伦在线| 97人妻中文字幕总站|