新颖的大环冠醚基对碘苯胺包合物:设计合成、晶体结构及介电性质
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第29卷第8期 2013年8月 无 机 化 CHINESE J0URNAL OF 学 学 报 IN0RGANIC CHEMISTRY V0I.29 No.8 l696 1702 新颖的大环冠醚基对碘苯胺包合物:设计合成、晶体结构及介电性质 周琴琴付大伟 f东南大学化学化工学院有序物质科学研究中心,南京 210096) 摘要:合成了新颖的有机一无机杂化超分子化合物,【(4一IA—NH3)・(18一crown.6)】:・(Cu:C16)(1),4-IA—NH3=对碘苯胺离子,18一crown一6= 18一冠一6。并通过红外光谱、粉末衍射、热重分析和单晶结构分析对化合物进行了充分表征。在转子定子型的超分子化合物1中, 【(4一IA—NH3).08.crown一6)r超分子阳离子和(cu cl 阴离子交错堆积形成包合物结构。变温介电常数测量表明,在130 ̄450 K范 围内没有相变引起的介电异样。大环醚的热无序运动及由此引起的氢键偶极瞬间变化使得化合物在低频500 Hz和高温350 K 以上具有较高的介电常数并伴随高的介电损耗。 关键词:包合物;冠醚;大环;晶体结构;介电 中图分类号:O614.121 文献标识码:A 文章编号:1001—4861(2013)08—1696—07 D0I 10.39690.issn.1001—4861.2013.00.299 A Novel Supramolecular Compound with 4-Iodobenzenaminium Based on 18-Crown-6:Synthesis.Structure and Dielectric Properties ZH0U (Ordered Matter Science Research Qin—Qin FU Da—Wei Center,Southeast University,Nanjing 210096,China) Abstract:One novel organic-inorganic hybrid supramolecular compound,([(4一IA—NH3)‘(1 8一crown一6)]2。(Cu2C16)(1), has been synthesized and characterized by IR spectroscopy,XRPD,thermogravimetric analysis and single crystal X—ray diffraction fwhere 4一IA—NH3+=4.iodobenzenaminium;18一crown.6=1 4,7,10,13,16一hexa0xacyclooctadecane). The organic[(4-IA.NH3)・(18一crown-6)1 cation assemblies and inorganic Cu2C12一anions arrange alternately to build the macrocycle—based rotator—stator supramolecular inclusion.Temperature—dependent dielectric constants of compound 1 show no distinct dielectric anomalies,suggesting no phase transition within the measured temperature range(130~450 K1.A high dielectric constant above 350 K at a low frequency of 500 Hz suggests that the increase in the disorder molecular thermal motion and/or H.bonding dipole interactions.CCDC:919514. Key words:inclusion compound;crown ether;macrocycle;crystal structure;permittivity 0 Introduction The solid.state materials with excellent dielectric properties will possess a wide range of potential applications in many high technology fields,such as filter,microelectronic device,solid-state transducer, resonator and other key components in microwave 收稿日期:2013-01.17。收修改稿日期:2013-05.30。 新世纪优秀人才计划和教育部博士点基金资助项目 通讯联系人。E.mail:dawei@seu.edu.cn communication systems[ 。。1,thus the design and synthesis of new dielectric materials have attracted increasing interest in recent years.At the same time, the research and exploration on the superexcellent dielectric materials have hitherto maintained a significant challengeF ̄.The dielectric properties of those solid.state materials need to meet different
第8期 周琴琴等:新颖的大环冠醚基对碘苯胺包合物:设计合成、晶体结构及介电性质 1697 requirements according to each working environment, such as operating frequencies,electric field strength, magnetic field,temperature and device types.And the materials with structural phase transition or special packing modes will show significantly different dielectric properties, especially this kinds of compounds with H—bonding strong interactions, disorder groups or hose—guest interactions.However, most of the dielectric materials with excellent properties are traditional inorganic salts and their derivatives (such as BaTiO3,Li2NbO3,Ba3ZnTa209, KH2PO4 and KD2P04).The structures and properties of these inorganic materials are hard to be regulated due to a relatively small number and types.In contrast, the inorganic—organic hybrid complexes,with the advantages of both inorganic and organic compounds, show eximious physical properties and adjustable features睁 .Therefore。recent researches on inorganic— inorganic hybrid complexes are of great interest in the exploration of novel physical properties as well as in understanding the relations between structure and propertiesl13. .Crown ether acts as a typical host molecule of organic-inorganic hybrid compounds, which ar0uses our attention and interest[ 20].The flexible crown—ether macrocyclic cavity provides sufficlent space to result in various motions of the host and guest molecules.And in this macrocyclic cavity,the host—guest supramolecular packing interac‘ tielns afford multiple N—H…O strong H-bonds which make a great contribution to the dielectric behaviors. As one part of our continuing studies on crown ethers’ based dielectric.ferroeleetric materials[ 韧,we herein report the synthesis(as shown in Scheme 1),crystal structure,thermogravimetric analysis and dielectric properties of an organic—inorganic hybrid compound 1 (【(4一IA—NH3)・(18一crown一6)]2‘(Cu2Cls)). i+ 旦 《 + 旦 /0、/j H [cl c l cfl
Scheme 1 Synthesis process and structural diagram 1 Experimental 1.1 Material and instrument A】1 the reagents and solvents employed were commercially available and used as supplied without further purification.Elemental analyses for carbon, hydrogen and nitrogen were performed on a Vario EL 111 elemental analyzer.The infrared spectra(4 000- 500 cm-1)were recorded by using KBr pellet on a SHIMADZU IRprestige.21 FrIR.8400S spectrometer. UV/Vis spectrum was measured at room temperature using SHIMADZU UV一2450 UV-Vis spectrophotometer. The X.ray powder diffraction(XRD)data were collected with a Siemens D5005 diffractometer with Cu K0[ radiation :0.154 18 nm).Dielectric constant was conducted using automatic impedance TongHui2828 Analyzer with frequency of 20 Hz to l MHz.and pellet sample was made through high—pressure of 10.0 MPa. 1.2 Preparation of complex【(4-IA-NHs)。(18- crown-6)12・(Cu2C16)(1) Compound 1 was synthesized by employing mild solvothermal method in the presence of organic 4- iodoaniline f4.IA.NH2),CuC12・2H2O,1 8一crown一6 and dilute HC1.CuC12・2H20(6 mmol,1.o4 was added into an 9 mL H,0/Me0H/HCl f4:4:l volume ratio) solution[19-20].TO this solution,1,4一IA-NH2(6 mmol, 1.32 g1 was slowly added under constant stirring. Methanol was added until the precipitate disappeared. The final mixture with the molar composition of Cu(1I)/ 18.crown一6/4.IA—NH2(1:1:1)was transferred into a 25 mL Teflon.1ined acid digestion bomb and heated at 80 f0r 1 d under autogenously pressure.Then the reaction was slowly cooled to room temperature at a rate of 1 0℃・h~.Colorless block monophasic crystals suitab1e f0r X.ray diffraction were obtained in 75% yield (based on CuC12).Elemental analysis for 1, C18H3oCl3CulNO6(653.23):Ana1.Calcd. ):c 33.08, H 4.59,N 2.14;Found(%):C 32.97,H 4.44,N 2.09. IR spectrum(cm~,KBr):3 428(s),3 374(s),3 3 1 l(m), 3 088(m),2 943(s),2 898(m),2 421(w),1 566(m), l 538(w),l 462(m),l 433(s),l 359(w),l 276(s), 1 222(m),1 2l l(m),1 135(s),1 081(w),941(m),879 (w),778(m),729(w),705(m),647(w),538 w),502(w).