龐海霞, 袁曦明, 何 雄, 李 明, 張 薔, 李桂娟
(1.湖北工業(yè)大學(xué) 輕工學(xué)部, 武漢 430068;2.中國地質(zhì)大學(xué) 材料與化學(xué)學(xué)院 教育部納米礦物材料及應(yīng)用工程研究中心, 武漢 430074)
?
一種新型Cd(Ⅱ)配合物的合成、表征及性質(zhì)研究
龐海霞1,2*, 袁曦明2, 何 雄1, 李 明1, 張 薔1, 李桂娟1
(1.湖北工業(yè)大學(xué) 輕工學(xué)部, 武漢 430068;2.中國地質(zhì)大學(xué) 材料與化學(xué)學(xué)院 教育部納米礦物材料及應(yīng)用工程研究中心, 武漢 430074)
以吡啶-4-甲醛縮4-氨基安替比林和Cd(NO3)2·4H2O為原料,溶劑熱法成功合成出了一個新型Cd(II)配合物[Cd2(L4)4(NO3)4](L4=吡啶-4-甲醛縮4-氨基安替比林),并通過紅外光譜、拉曼光譜、元素分析、X-粉末衍射、單晶X射線衍射對配合物的單晶結(jié)構(gòu)進行了表征. 該配合物屬于單斜晶系,空間群C2/c,晶胞參數(shù)a=22.585(9)?,b=9.636(4)?,c=18.827(8) ?,α=90°,β=125.152(6)°,γ=90°,V=3350(2) ?3, Z=2,Dc=1.628 Mg/m3,F(xiàn)(000)=1 672,μ=0.722 mm-1,R1=0.0488,wR2=0.0967 (I>2σ(I)).室溫固態(tài)熒光測試顯示,配合物在517 nm(λmax) 具有強的熒光吸收.
吡啶類希夫堿; 溶劑熱法; 晶體結(jié)構(gòu); 熒光性質(zhì)
由于鎘(Ⅱ)具有多變的配位數(shù)而使得Cd(Ⅱ)配合物表現(xiàn)出不同的結(jié)構(gòu)類型[1-2],并且在催化[3]、發(fā)光[4]和吸附[5]等方面的研究引起人們廣泛關(guān)注[6-8].水熱合成法是配位聚合物合成方法[9-11]中的一種,遵循液體成核模式反應(yīng)機理[12].希夫堿的化學(xué)配位性能良好,在分析化學(xué)[13]、有機催化[14]、配位生物化學(xué)[15-16]、功能材料[17-18]等學(xué)科領(lǐng)域均有重要的研究價值.同時,在分析、生物、臨床、藥理等方面具有廣泛應(yīng)用價值[19-23].盡管部分4-氨基安替比林金屬配合物及其衍生配體的結(jié)構(gòu)表征數(shù)據(jù)已經(jīng)被報道[24-28],但該類化合物的配位化學(xué)研究仍有很大的空間.
本文以吡啶類希夫堿衍生物吡啶-4-甲醛縮4-氨基安替比林為配體,合成出了一種新型Cd(Ⅱ)的配合物[Cd2(L4)4(NO3)4](L4=吡啶-4-甲醛縮4-氨基安替比林),用單晶X射線衍射、X-粉末衍射、紅外光譜、拉曼光譜、元素分析和熒光分析等手段對該配合物進行表征及性質(zhì)研究.晶體結(jié)構(gòu)分析表明,該金屬配合物屬于單斜晶系,空間群為C2/c.
1.1試劑與儀器
吡啶-4-甲醛(購買于FLUKA公司)其余試劑均為分析純.Bruker公司EQUINOX 55紅外光譜儀(KBr壓片),攝譜范圍4 000~400 cm-1;Carlo ERBA1106型全自動量有機元素分析儀;日立公司F-4500分光光度計; Bruker公司CCD面探衍射儀;荷蘭X Pert PRO粉晶衍射儀;SENTERRA激光拉曼光譜儀.
1.2配合物的合成1.2.1希夫堿吡啶-4-甲醛縮4-氨基安替比林(L4)的合成 L4的合成如圖1所示,稱取4-氨基安替比林4.065 g(20 mmol),溶于160 mL無水乙醇中,磁力攪拌,80℃加熱至回流;再緩慢滴加含1.90 mL (20 mmol)吡啶-4-甲醛的乙醇溶液20 mL;加完后回流5 h,冷卻至室溫,有黃色的針狀晶體析出.
圖1 L4的合成步驟Fig.1 The synthesis route of L4
1.2.2配合物[Cd2(L4)4(NO3)4]的合成 稱取0.078 g (0.25 mmol)Cd(NO3)2·4H2O、0.078 g(0.25 mmol) L4于25 mL高壓釜中,加入無水乙醇4 mL,并滴加0.5 mL二氯甲烷;搖勻后,密封,置于90℃的烘箱中,7 d后黃色小塊狀晶體長出,產(chǎn)率80.2%.元素分析實驗值(理論值)/%: C,49.17(49.20); H,5.06(5.10);Cd,13.49(13.50); N,16.87(16.80); O,15.42(15.40).
2.1配合物的晶體結(jié)構(gòu)
取大小為0.23×0.10×0.10 mm3的配合物晶體置于Bruker CCD面探衍射儀上,用石墨單色化的Mo-Kα (λ=0.71073 ?)射線在2.21°≤θ≤26.00°范圍內(nèi),以Ψ/θ掃描方式于298(2) K收集衍射數(shù)據(jù), 衍射數(shù)據(jù)用SAINT PUS程序進行數(shù)據(jù)簡化和經(jīng)驗吸收校正.共收集到11 439個衍射點,獨立衍射點3 287個(R(int)=0.049 2),其中3 287個可觀測點[I> 2σ(I)]用于晶體結(jié)構(gòu)解析,全部強度數(shù)據(jù)經(jīng)Lp因子吸收校正.所有計算均用SHELXS-97[29]和SHELXL-97[30]程序,理論加氫,全部非氫原子的坐標和各向異性熱參數(shù)經(jīng)全矩陣最小二乘法修正收斂.該配合物的簡要晶體數(shù)據(jù)列于表1,部分鍵長和鍵角列于表2.配合物晶體結(jié)構(gòu)數(shù)據(jù)已經(jīng)保存至劍橋晶體數(shù)據(jù)庫中心(CCDC 913871).
配合物[Cd2(L4)4(NO3)4]的晶體結(jié)構(gòu)和晶胞圖分別如圖2和圖3所示,該配合物晶體屬于單斜晶系,其空間群為C2/c,每個晶胞中含有4個配位單元.在該配合物的晶體結(jié)構(gòu)中,每個鎘(Ⅱ)金屬中心采用畸變的八面體結(jié)構(gòu)空間配位構(gòu)型,6個配位原子分別為4個氧原子和2個氮原子,2個氮原子位于頂點處(N4A—Cd1—N4B夾角為159.11 (17))°.每個鎘(Ⅱ)原子采用CdO4N2的六配位環(huán)境,每個鎘(Ⅱ)分別與相鄰配體分子吡啶-4-甲醛縮4-氨基安替比林(L4)中的羰基氧原子和另2個相鄰配體吡啶-4-甲醛縮4-氨基安替比林(L4)上吡啶環(huán)的氮原子分別配位,同時還與兩分子硝酸根離子分別發(fā)生單齒配位,其Cd1—N4A、Cd1—N4B以及N4—Cd1A鍵長均為2.264(3) ?,而Cd—O鍵長為2.290(3) ?和2.410(7) ?,這些鍵長與文獻報道相似[31-32].另外配合物還通過C—H…O非典型氫鍵的鍵合作用連接成一維網(wǎng)狀結(jié)構(gòu)(表3).
表1 配合物的晶體學(xué)數(shù)據(jù)和結(jié)構(gòu)精修參數(shù)Tab.1 Crystal data and structure refinement for complex
表2 配合物的主要鍵長[?]和鍵角[°]Tab.2 Selected Bond lengths [?] and angles [°] for complex
Symmetry transformations used to generate equivalent atoms: (A) 0.5-x, 0.5-y, 1-z; (B)-0.5+x, 0.5-y,-0.5+z; (C)-x,y, 0.5-z.
圖2 配合物[Cd2(L4)4(NO3)4]晶體結(jié)構(gòu)圖Fig.2 The ORTEPT molecular structure of complex [Cd2(L4)4(NO3)4]
圖3 配合物[Cd2(L4)4(NO3)4]的三維空間堆積圖. 其中黑色虛線代表C—H…O氫鍵Fig.3 Part of the crystal packing diagram for the complex in which C—H…O hydrogen bonds were represented by black dashed表3 配位聚合物[Cd2(L4)4(NO3)4]的氫鍵數(shù)據(jù)Tab.3 Hydrogen-bonding geometry for complex ? or (°)
Donor—H…AcceptorD—HH…AD…AD—H…AC4—H4…O4i0.93002.47003.190(12)135.00C6—H6…N3ii0.93002.62003.518(6)161.00C10—H10C…O3iii0.96002.56003.31(2)134.00C11—H11C…O2ii0.96002.45003.278(19)144.00C12—H12…O10.93002.51003.110(5)122.00
symmetry codes: i=-1/2+x,1/2-y,-1/2+z; ii=-x,1-y,1-z; iii=x,1+y,z.
2.2配合物的粉末X射線衍射分析
配合物粉末X射線衍射圖XRD如圖4所示.從圖4可以看出本實驗得到的晶態(tài)樣品是純度單一化合物,實驗測試得到的X射線衍射圖與通過單晶X射線衍射結(jié)構(gòu)理論模擬所得數(shù)據(jù)的衍射圖峰位完全一致,其衍射強度差異主要是粉末X射線衍射強度數(shù)據(jù)收集時的樣品晶體取向不同造成.X-射線粉末衍射進一步說明該配合物的單晶結(jié)構(gòu)測試與結(jié)構(gòu)解析的正確性.
(虛線是根據(jù)晶體結(jié)構(gòu)模擬所得,實線為實驗所得)圖4 配合物的X-射線粉末衍射譜圖Fig.4 X-ray powder diffraction patterns for the Cd(Ⅱ) complex(the solid lines are generated from the experimental data,and the dashed lined are simulated from the single crystal X-ray data of the complex)
2.3配合物的紅外分析
由圖5可以看出,該配合物在1 610 cm-1和1 593 cm-1處有吸收峰,分別歸屬于配體吡啶-4-甲醛縮4-氨基安替比林中υC=O和υC=N鍵的伸縮振動.配合物在1 593 cm-1,1 568 cm-1,1 546 cm-1和1 443 cm-1出現(xiàn)的強吸收峰歸屬于苯環(huán)中υC=C骨架特征峰[33].3 059 cm-1附近處有較弱的吸收峰是配體吡啶-4-甲醛縮4-氨基安替比林中的希夫堿結(jié)構(gòu)上υC—H的伸縮振動峰.紅外分析結(jié)果與晶體結(jié)構(gòu)分析結(jié)果一致.
圖5 Cd(Ⅱ)配合物的紅外光譜圖Fig.5 The infrared spectra for the Cd(Ⅱ) complex
2.4配合物的拉曼分析
圖6 配合物[Cd2(L4)4(NO3)4]的拉曼光譜圖Fig.6 The Raman spectra for the complex [Cd2(L4)4(NO3)4]
2.5配合物的熒光分析
該配合物的室溫固態(tài)熒光光譜圖如圖7所示.該配合物用300 nm紫外光激發(fā)后,與配體相比,在517 nm處可激發(fā)出強的綠色熒光.熒光發(fā)生紅移,這是由于配體與Cd(Ⅱ)配位后提高了π電子的共扼程度,使π→π*電子移動加強而發(fā)生紅移.配合物中強的綠色熒光發(fā)射主要歸屬為配體吡啶-4-甲醛縮4-氨基安替比林(L4)到金屬Cd(Ⅱ)的電荷轉(zhuǎn)移(LMCT)[34-35].說明此配合物可作為潛在的綠色熒光材料.
圖7 室溫下(λex=300 nm) 配合物[Cd2(L4)4(NO3)4]的固態(tài)熒光發(fā)射光譜Fig.7 Solid-state fluorescent emission spectra of the complex [Cd2(L4)4(NO3)4] at room temperature (λex=300 nm)
本文選用含功能官能團安替比林基的吡啶類中性希夫堿配體L4為配體與Cd(NO3)2·4H2O在水熱(溶劑熱)條件下合成新型Cd(Ⅱ)配合物[Cd2(L4)4(NO3)4].用300 nm紫外光照射配合物,發(fā)現(xiàn)該化合物與配體相比,發(fā)生紅移,在517 nm處發(fā)出強的綠色熒光.說明此配合物可作為潛在的綠色熒光材料,并且對4-氨基安替比林衍生物的結(jié)構(gòu)化學(xué)研究、性質(zhì)研究提供有用信息.
[1] Zhang L P,Ma J F,Yang J,et al. Series of 2D and 3D coordination polymers based on 1,2,3,4-benzenetetracarboxylate and N-donor ligands: Synthesis, topological structures, and photoluminescent properties [J].Inorg Chem, 2010, 49(4):1535-1550.
[2] Liu D,Ren Z G,Li H X,et al.Single-crystal-to-single-crystal transformations of two three-dimensional coordination polymers through regioselective[2+2]photodimerization reactions [J].Angew Chem Int Ed, 2010, 49(28):4767-4770.
[3] Avijit Kumar Paul,Udishnu Sanyal,Srinivasan Natarajan,et al. Use of polyazaheterocycles in the assembly of new cadmium sulfate frameworks: Synthesis, structure, and properties cryst [J].Crystal Growth & Design, 2010, 10(9): 4161-4175.
[4] Zhang D J,Guo Y,Shi J,et al. Hydrothermal in stiu synthesis,crystal structure and flurescence property of two cadmiun coordination polymers [J].Chem J Chinese Universities, 2007, 28(10):1817-1820.
[5] Li Zuo-Xi, Hu Tong-Liang, Ma Hong,et al. Adjusting the porosity and interpenetration of cadmium(Ⅱ) coordination polymers by ligand modification: Syntheses, structures, and adsorption properties [J].Crystal Growth & Design, 2010, 10(3): 1138-1144.
[6] Xiaofang Guo, Zifeng Li, Chun Yue,et al. Three novel Cd(Ⅱ) coordination polymers: Synthesis, crystal structures,fluorescence and thermal properties [J].Polyhedron, 2010, 29(1): 384-390.
[7] Liu Guang-Fei, Ren Zhi-Gang, ChenYang,et al. Solvothermal synthesis, structure and luminescent properties of a new 3D coordination polymer [K2Cd(Htda)2]n(Htda=1,2,3-triazole-4,5-dicarboxylate) [J]. Inorg Chem Commun, 2008, 11(2):225-229 .
[8] Jioa Chang-Mei, Zhang Wen-Hua, Tang Xiao-Yan,et al. Formation of a 1D water chain into the channel of a unique 3D hydrogen-bound coordination polymer {[Cd(μ-Cl)(4-pya)(H2O)]2·4H2O} ∞(4-pya=trans-4-pyridylacrylate) [J].Inorg Chem Commun, 2007, 10(9):975-978.
[9] 陶兆林, 石婷婷, 梁麗麗, 等. 四重穿插金剛石型三維鋅(Ⅱ) 配位聚合物的水熱合成晶體結(jié)構(gòu)及熒光性質(zhì)[J].人工晶體學(xué)報, 2013, 42(2):371-376.
[10] 劉曉麗. 希夫堿及其衍生物的研究進展[J]. 甘肅科技, 2012, 24(28) :75-79.
[11] 關(guān) 磊, 王 瑩. 具有三維超分子結(jié)構(gòu)的單核鋅配合物[Zn(py)3(H2O)3](1,5-nds) 的合成與表征[J].人工晶體學(xué)報, 2013, 42(2):377-381.
[12] Barrer R M. Hydrothermal Chemistry of Zeolites [M]. London: Academic Press, 1982.
[13] 楊志斌, 范 洪. 新希夫堿的分析應(yīng)用研究: BP-DIB 熒光熄滅法測定水中微量鉻(VI) [J]. 分析測試學(xué)報, 1995, 14(1) : 29-32.
[14] 仇 敏, 劉國生, 姚小泉, 等. 手性銅(Ⅱ)-席夫堿配合物催化苯乙烯不對稱環(huán)丙烷化反應(yīng)[J]. 催化學(xué)報, 2001, 22(1) : 77-50.
[15] Hodnett E M,Dunn W J. Structure-antitumor activity correlation of some Schiff bases [J].J Med Chem, 1970, 13: 768-70.
[16] Chen H,Rhodes J. Schiff base forming drugs:mech-anisms of immune potentiation and therapeutic potential [J]. J Mol Med, 1996, 74: 497-504.
[17] 呂緒良, 許衛(wèi)東, 崔傳安, 等. 席夫堿的合成及其在熱紅外偽裝涂料中的應(yīng)用[J].解放軍理工大學(xué)學(xué)報, 2000, 1(6) : 54-57.
[18] Vaughn A E, Duval P B, Bassil D B, et al. Contrasting solvent and capping ligand effects directing the photocheminstry of uranyl( Ⅵ ) Schiff base complexs [J]. J Am Chem Soc, 2006, 128(33) : 10656-10657.
[19] Raman N, Kulandaisamy A, Shunmugasundaram A, et al. Synthesis, spectral, redox and antimicrobial activities of Schiff base complexes derived from 1-phenyl-2,3-dimethyl-4-aminopyrazol-5-one and acetoacetanilide[J]. Transition Metal Chemistry, 2001, 26:131-135.
[20] Sun G, Sun Y X, Yu C, et al. Synthesis,crystal structure,vibrational spectral and density functional studies of 4-(2,5-dioxo-2H-pyrrol-1(5H)-yl)antipyrine[J]. Journal of Molecular Structure, 2011, 10(6):383-394.
[21] Rajendran G, Sreeletha G S. Synthesis,characterization ande antimicrobial studies of some mixed ligand complexes of lanthanide(Ш) ions[J]. Asian Journal of Chemistry, 2002, 14(3-4):1639-1645.
[22] Zheng Y, Lin J, Liang Y, et al. Electric-field-induced fatigue crack growth in ferroelectric ceramics [J]. Mater Lett, 2002, 54: 424-429.
[23] Ismail Z K, Eidissouky A, Shehada A Z. Spectroscopic and magnetic studies on some copper(Ⅱ) complexes of antipyrine Schiff base derivatives [J]. Polyhedron, 1997, 16(17): 2909-2916.
[24] 張 璞. 新型有機-無機雜化雜金屬多核配合物[Cd2(CuL)4(V4O12)]·2CH3OH·2H2O的合成與晶體結(jié)構(gòu)[J]. 東北師大學(xué)報:自然科學(xué)版, 2013, 1(45):77-100.
[25] Wang X W, Zheng Y Q.A dinuclear copper(Ⅱ) complex and azigzag chain iron(Ⅱ) polymer based on the 4-antipyrine derived Schiff base ligands:The hydroxylation and redox occurred under the solvothermal conditions[J]. Inorganic Chemistry Communications, 2007, 10: 709-712.
[26] Wang X W, Zheng Y Q. Synthesis, structure and magnetic properties of Ni2(NO3)4(APTY)4(APTY=1,5-dimethyl-2-phenyl-4-{[(1 E)-pyridine-4-ylmethylene]amino}-1,2-dihydro-3 H-pyrazol-3-one) [J]. Journal of Coordination Chemistry, 2007, 60(7):763-769.
[27] 何 雄, 龐海霞. 一種新型四核銅(Ⅱ)簇配合物的合成及性質(zhì)表征[J].華中師范大學(xué)學(xué)報:自然科學(xué)版, 2013, 47(5):653-657.
[28] Zheng Y, Lin J, Liang Y, et al. A novel terbium (ⅡI) beta-diketonate complex as thin film for optical device application [J]. Mater Lett, 2002, 54: 424-429.
[29] Sheldrick G M. SHELXS-97, Programm zur Losung von Kristallstrukturen[P]. Gottingen: Germany, 1997.
[30] Sheldrick G M. SHELXL-97, Programm zur Verfeinerung von Kristallstrukturen[P]. Gottingen: Germany, 1997.
[31] 江 晶, 王冬杰, 劉志鵬, 等. 1,3-二(4-吡啶基)丙烷Cd(Ⅱ)配合物的合成、晶體結(jié)構(gòu)及發(fā)光性質(zhì)研究[J]. 無機化學(xué)學(xué)報, 2013, 9(29):1952-1956.
[32] 康新平, 安 哲. 新型鎘配合物{[Cd2(C20H17N3O3F2)2(C8H4O4)2]·H2O}的合成及其晶體結(jié)構(gòu)[J]. 合成化學(xué), 2013, 21(4):465-468.
[33] Ismail Z K, Eidissouky A, Shehada A Z. Spectroscopic and magnetic studies on some copper(Ⅱ) complexes of antipyrine Schiff base derivatives [J]. Polyhedron, 1997, 16(17): 2909-2916.
[34] Dai J C,Wu X T,Fu Z Y,et al. A novel ribbon-candy-like supramolecular architecture of cadmium(Ⅱ)-terephthalate polymer with giant rhombic channels:twofold interpenetration of the 3D 8210-a net[J]. Chem Commun, 2002(1): 12-13.
[35] Zhang L Y, Liu G F, Zheng S L, et al. Helical ribbons of cadmium(Ⅱ) and zinc(Ⅱ) dicarboxylates with bipyridyl-like chelates——Syntheses, crystal structures and photoluminescence [J]. Eur J Inorg Chem, 2003, 16: 2965-2971.
Synthesis, characterization and properties study of a new cadmium (Ⅱ) complex
PANG Haixia1,2, YUAN Ximing2, HE Xiong1, LI Ming1, ZHANG Qiang1, LI Guijuan1
(1.Department of Light Industry, Hubei University of Technology, Wuhan 430068;2.Engineering Research Center of Nano-Geo Materials of the Ministry of Education,F(xiàn)aculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074)
A new cadmium (Ⅱ) complex [Cd2(L4)4(NO3)4] (L4=pyridine-4-carboxaldehyde and 4-aminoantipy-rine) has been solvothermally synthesized and structurally characterized by elemental analysis,IR,Raman,XRD,and single-crystal X-ray diffraction.The compound belongs to monoclinic system with space groupC2/cand cell parameter:a=22.585(9)?,b=9.636(4)?,c=18.827(8) ?,α=90°,β=125.152(6)°,γ=90°,V=3350(2) ?3,Z=2,Dc=1.628 Mg/m3,F(xiàn)(000)=1 672,μ=0.722 mm-1,R1=0.048 8,wR2=0.0967 [I> 2σ(I)]. The cadmium (Ⅱ) complex exhibits strong fluorescence absorption at 464 nm( λmax) in the solid state at room temperature.
pyridine class schiff’s base; solvothermal method; crystal structure; fluorescence property
2013-12-28.
國家自然科學(xué)基金項目(51173039); 納米礦物材料及應(yīng)用教育部工程研究中心開放課題項目(CUGNGM201312)和2012年度地方高校第二批國家級大學(xué)生創(chuàng)新創(chuàng)業(yè)訓(xùn)練計劃項目(201210500039).
1000-1190(2014)04-0538-06
O614.24
A
*E-mail: phx2001253@163.com.