• 
    

    
    

      99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

      (1,2-(1H-1,2,4-三唑))乙烷的一維雙鏈 Cu(Ⅱ)配合物合成與表征

      2011-11-09 12:50:30常若男武向俠馬玲玲
      關(guān)鍵詞:天津師范大學(xué)雙鏈分子結(jié)構(gòu)

      丁 斌 常若男 武向俠 王 丹 馬玲玲

      (天津市功能分子結(jié)構(gòu)與性能重點(diǎn)實(shí)驗(yàn)室,天津師范大學(xué)化學(xué)學(xué)院,天津 300387)

      (1,2-(1H-1,2,4-三唑))乙烷的一維雙鏈 Cu(Ⅱ)配合物合成與表征

      丁 斌*常若男 武向俠 王 丹 馬玲玲

      (天津市功能分子結(jié)構(gòu)與性能重點(diǎn)實(shí)驗(yàn)室,天津師范大學(xué)化學(xué)學(xué)院,天津 300387)

      利用高度柔性的雙三唑配體(1,2-(1H-1,2,4-三唑))乙烷(L)和銅鹽反應(yīng)合成了1個(gè)新的具有一維雙鏈結(jié)構(gòu)的銅(Ⅱ)配合物{[Cu(cis-L)2Br]Br·2H2O}n(1)。單晶結(jié)構(gòu)表明:配合物1的晶體屬于三斜晶系,P1空間群。在配合物1中雙三唑配體采用反式構(gòu)型,橋聯(lián)相鄰的中心銅離子形成一維雙鏈結(jié)構(gòu),晶格中游離的Br原子同配位水分子形成了四元環(huán)狀的Br…O超分子環(huán)。測(cè)定了配合物1在2~300 K的變溫磁化率,結(jié)果表明相鄰銅離子間存在弱的反鐵磁相互作用。

      (1,2-(1H-1,2,4-三唑))乙烷;銅配合物;一維雙鏈;反鐵磁

      During the lasttwo decades metal-organic coordination polymers have aroused great interest for chemists due to their extremely versatile coordination motifs and potential applications in many areas such as light-emitting diodes(LEDs),catalytic,magnetic properties and so on[1-4].Although a variety of metal coordination frameworks with beautiful topologies and interesting electronic,magnetic,optical properties have been synthesized,rational control in the construction of polymeric networks remains a great challenge.Judicious selection of different flexible or rigid ligands can dramatically tune ultimate structural motifs of these coordination frameworks[5].

      1,2,4-triazole and,in particular,its derivatives are very interesting ligands for their important properties[6].For example,these triazole ligands strength is just in the region to give spin crossover compounds with iron(Ⅱ)salts.Such systems are applicable for information storage and some other applications[7].Previously we reported a series of 3,5-substituted triazole-cadmium coordination polymers from zero-to three-dimensional tuned via different triazole ligands and anions[8].In this work the flexible 1,2-bis(1,2,4-triazole-1-yl)ethane(L)ligands was employed.L is highly flexible and can adopt variable trans-and cis-conformations.One new 1D{[Cu(cis-L)2Br]Br·2H2O}n(1)compound can be isolated.In 1 two cis-L molecules bridge central copper(Ⅱ) ions forming 1D double-chain structure,fourmember Br…O supra-molecular cycles can also be observed.The varied temperature magnetic property of 1 from 300 to 2 K was also investigated.

      1 Experimental

      1.1 Materials and general methods

      The bis-triazole ligand 1,2-bis(1,2,4-triazole-1-yl)ethane (L)was prepared according to the literature method[9].Other reagents were purchased commercially and used withoutfurtherpurification.Elemental analyses of carbon,hydrogen and nitrogen were carried out with a CE-440 (Leeman-Labs)analyzer.FTIR spectrum (KBr pellets)was taken on an AVATAR-370(Nicolet)spectrometer in the range 4 000~400 cm-1region.Variable-temperature magnetic susceptibilities were measured using a MPMS-7 SQUID magnetometer.Diamagneticcorrectionsweremadewith Pascals constants for all constituent atoms.

      1.2 Synthesis of{[Cu(cis-L)2Br]Br·2H2O}n(1)

      Complex 1 was prepared by refluxing L ligand(32.8 mg,0.2 mmol)and CuBr2·2H2O (25.9 mg,0.1 mmol)in 15 mL aqueous solution for 1 h.The precipitate was filtrated and blue crystals were isolated from the filtrate within one week.Yield:44%(based on Cu).Anal.Calc.for C12H20Br2CuN12O2(%):C,24.52;H,3.43;N,28.60.Found(%):C,24.12;H,3.63;N,28.80.IR(KBr,cm-1):3 400(br),3 140(w),3 126(m),3 060(w),1555(s),1475(m),1446(s),1390(s),1362(w),1322(s),1189(s),1078(s),985(s),862(s),835(s),774(s),680(m),625(s),407(w).

      1.3 X-ray crystallography and structural refinement

      Structure measurement of 1 was performed on a computer controlled Bruker SMART APEX-ⅡCCD diffractometer equipped with graphite-monochromated Mo Kα radiation with radiation wavelength 0.071 073 nm by using a ω-scan technique.Semi-empirical absorption corrections using SADABS program were applied.The structure was solved by direct methods and refined with the full-matrix least-squares technique usingtheSHELX-97programs[10].Hydrogenbondlengths and bond angles for 1 are listed in Table 3.Anisotropic thermal parameters were assigned to all non-hydrogen atoms.The organic hydrogen atoms were generated geometrically.The crystallographic data and selected bond lengths and angles are listed in Table 1 and Table 2,respectively.

      CCDC:753647.

      Table 1 Crystallographic data and structure refinement summarya

      Table 2 Selected bond distance(nm)and angles(°)

      Table 3 Hydrogen bond lengths and bond angles for 1

      2 Results and discussion

      As is shown in Fig.1,1 is a 1D chain structure bridged by two L molecules.The central copper(Ⅱ) ion is five-coordinated by four nitrogen atoms of four cis-L ligands and one bromide anion.The central copper(Ⅱ)ion also has weak interaction with lattice bromide anion(0.338 6 nm).The Cu(1)-N distances(from 0.200 3(19)to 0.2.0072(17)nm)are comparable with those of other Cu(Ⅱ)-triazole complexes[11].Neighboring copper(Ⅱ) ions are linked by two cis-Lligands to form 1D double-chain structure.The Cu… Cu separation across bridging ligands is 0.8772(3)nm.It is interesting that bromide anions and lattice water molecules O(1)have weak interaction to generate intermolecular hydrogen bonds.Thus four-membered Br2O2cycle clusters constructed via hydrogen bonding can be found in the supramolecular structure (Fig.2).The four-member cycle clusters link two neighboring chains to form ladder structure.Furthermore,the lattice water O(2)also has the hydrogen-bonding interaction with O(1)i,which help to stabilize the supra-molecular structure.

      Fig.1 An ORTEP drawing of 1 showing the coordination environment of five-coordinated CuⅡions

      Fig.2 Four-membered Br2O2cycles link two neighboring chains to form 1D ladder structures

      2.1 Magnetic properties of 1

      Fig.3 μeffversus T and 1/χMversus T plot for 1 indicating the existence of weak anti-ferromagnetic interactions

      The complex 1 was studied by magnetic susceptibility measurements in the 2~300 K regions.The magnetic behaviour of 1 is shown in the form of a χMT versus T plot(Fig.3).A magnetic moment of 1.87 B.M./Cu2+is observed,a value typical μeffvalue for a Cu(Ⅱ)atom with d9configuration[12].The magnetic behaviour of 1 can be interpreted by the Curie-Weiss law with Curie value and Weiss constant of 0.44(5)cm3·K·mol-1and-5.02(5)K,which also reveal the existence of weak anti-ferromagnetic interaction in 1.The result should be ascribed that the long L ligands can not effectively transmit the magnetic interactions between neighbouring copper(Ⅱ)ions.

      [1]Ouellette W,Prosvirin A V,Valeich J,et al.Inorg.Chem.,2007,46:9067-9082

      [2]Zou W Q,Wang M S,Li Y,et al.Inorg.Chem.,2007,46:6852-6854

      [3]Tekarli S M,Cundari T R,Omary M A.J.Am.Chem.Soc.,2008,130:1669-1675

      [4]Cariati E,Bu X,Ford P C.Chem.Mater.,2000,12:3385-3391

      [5]Ghosh S K,Zhang J P,Kitagawa S.Angew.Chem.Int.Ed.,2007,46:7965-7968

      [6](a)Haasnoot J G.Coord.Chem.Rev.,2000,200-202:131-185

      (b)Wang S W,Yang Y,Li B L,et al.Chinese J.Inorg.Chem.(Wuji Huaxue Xuebao),2007,26(7):763-766

      (c)Peng Y F,Liu T B,Yang X H,et al.Chinese J.Inorg.Chem.(Wuji Huaxue Xuebao),2006,25(7):793-796

      [7]Kahn O,Martinez C J.Science,1998,279:44-48

      [8](a)Wang Y,Ding B,Cheng P,et al.Inorg.Chem.,2007,46:2002-2010

      (b)Huang Y Q,Ding B,Song H B,et al.Chem.Commun.,2006:4906-4908

      (c)Yi L,Zhu L N,Ding B,et al.Inorg.Chem.Commun.,2003,6:1209-1212

      [9]Gioia G,Bonati F,Cingolani A,et al.Synth.React.Inorg.Met.Org.Chem.,1988,18:535-550

      [10](a)Sheldrick G M.SHELXL-97,Program for the Solution of Crystal Structures,University of G?ttingen,1997.

      (b)Sheldrick G M.SHELXL-97,Program for the Refinement of Crystal Structures,University of G?ttingen,1997.

      [11]Ding J G,Ge H Y,Zhang Y M,et al.J.Mol.Struct.,2006,782:143-149

      [12]Ciurtin D M,Pschirer N G,Smith M D,et al.Chem.Mater.,2001,13:2743-2745

      Synthesis and Characterization of One Novel 1D Double-Chain Copper(Ⅱ)Complex with 1,2-Bis(1,2,4-triazole-1-yl)ethane

      DING Bin*CHANG Ruo-Nan WU Xiang-XiaWANG Dan MA Ling-Ling
      (Tianjin Key Laboratory of Structure and Performance for Functional Molecule,Tianjin Normal University,Tianjin 300387,China)

      Using the highly flexible bis-triazole ligand 1,2-bis(1,2,4-triazole-1-yl)ethane(L),one new complex{[Cu(cis-L)2Br]Br·2H2O}n(1)has been synthesized and characterized by elemental analysis,FTIR and single crystal X-ray diffraction analysis.It belongs to triclinic system with space group P1,a=0.757 0(2)nm,b=0.877 2(3)nm,c=1.6415(5)nm,α=104.187(5)°,β=90.905(5)°,γ=98.589(5)°,V=1.0434(5)nm3,Z=2.In 1 two cis-L molecules bridge central copper(Ⅱ) ions forming 1D double-chain structure,four-member Br…O supra-molecular cycles can also be observed.The varied temperature magnetic property of 1 has been investigated from 300 to 2 K indicating weak antiferromagnetic interactions between neighboring copper(Ⅱ) ions.CCDC:753647.

      1,2-bis(1,2,4-triazole-1-yl)ethane;copper complex;one-dimentional double-chain;anti-ferromagnetic

      O614.121

      A

      1001-4861(2011)01-0189-04

      2010-06-21。收修改稿日期:2010-08-08。

      天津市教委基金(No.20090504)資助項(xiàng)目。

      *通訊聯(lián)系人。E-mail:qsdingbin@yahoo.com.cn

      猜你喜歡
      天津師范大學(xué)雙鏈分子結(jié)構(gòu)
      把握分子結(jié)構(gòu)理解物質(zhì)的性質(zhì)
      “不速之客”
      天津師范大學(xué)美術(shù)與設(shè)計(jì)學(xué)院作品選登
      An Experimental Study of Tone and Tone Sandhi in the New School of Nanjing Dialect
      昆蟲共生細(xì)菌活體制造雙鏈RNA
      海外星云 (2021年21期)2021-01-19 14:17:31
      蘭花
      三步法確定有機(jī)物的分子結(jié)構(gòu)
      解讀分子結(jié)構(gòu)考點(diǎn)
      外電場(chǎng)中BiH分子結(jié)構(gòu)的研究
      高新區(qū)科技企業(yè)孵化網(wǎng)絡(luò)“雙層雙鏈”結(jié)構(gòu)研究
      新龙县| 调兵山市| 临颍县| 内江市| 塔河县| 奉节县| 尤溪县| 敦煌市| 阿勒泰市| 象山县| 开封市| 海淀区| 修水县| 巴塘县| 紫阳县| 二连浩特市| 仁寿县| 湘西| 时尚| 临夏县| 包头市| 漳平市| 南乐县| 桃源县| 东源县| 雅江县| 隆尧县| 苏尼特左旗| 丰都县| 额敏县| 清原| 奎屯市| 清涧县| 小金县| 广水市| 凤台县| 延川县| 齐齐哈尔市| 泰顺县| 清原| 高邑县|