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        新型雜化材料[(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O的水熱合成及結(jié)構(gòu)表征

        2014-07-27 02:18:01馬云飛孫乙庭王瑞庫(kù)馮引弟劉雙英馬琢琪欒國(guó)有
        關(guān)鍵詞:雜化鍵長(zhǎng)晶體結(jié)構(gòu)

        張 科,馬云飛,孫乙庭,王瑞庫(kù),馮引弟,劉雙英,馬琢琪,欒國(guó)有

        (1.吉林省水利水電勘測(cè)設(shè)計(jì)研究院,吉林 長(zhǎng)春 130012;2.現(xiàn)代天豐農(nóng)業(yè)集團(tuán)有限公司,吉林 長(zhǎng)春 130000;3.吉林農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院,吉林 長(zhǎng)春 130118)

        新型雜化材料[(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O的水熱合成及結(jié)構(gòu)表征

        張 科1,馬云飛1,孫乙庭1,王瑞庫(kù)1,馮引弟2,劉雙英1,馬琢琪1,欒國(guó)有3

        (1.吉林省水利水電勘測(cè)設(shè)計(jì)研究院,吉林 長(zhǎng)春 130012;2.現(xiàn)代天豐農(nóng)業(yè)集團(tuán)有限公司,吉林 長(zhǎng)春 130000;3.吉林農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院,吉林 長(zhǎng)春 130118)

        用水熱方法合成了一種新型的無(wú)機(jī)-有機(jī)雜化材料[(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O,并采用元素分析、形貌分析、紅外光譜、紫外光譜、熱重分析和X射線單晶結(jié)構(gòu)分析對(duì)其進(jìn)行了表征.結(jié)果表明:該化合物屬于單斜晶系,P2(1)/n空間群;晶胞參數(shù)a=1.890 4 nm,b=2.047 8 nm,c=2.172 8 nm,α=90°,β=96.404°,γ=90°,V=8.358 9 nm3,Z=4,R1=0.050 2,wR2=0.117 1.

        多金屬氧酸鹽;無(wú)機(jī)-有機(jī)雜化材料;晶體結(jié)構(gòu);水熱合成

        0 引言

        1 實(shí)驗(yàn)部分

        1.1 試劑與儀器

        試劑:所用化學(xué)試劑均為分析純;所用水為蒸餾水,使用時(shí)未進(jìn)一步純化.

        儀器:元素分析采用美國(guó)Leeman labs Inc產(chǎn)PLASMASPE電感耦合等離子體發(fā)射光譜儀;樣貌分析采用日本島津公司產(chǎn)的SSX-550型掃描電子顯微鏡測(cè)定晶體的外觀;紅外光譜采用KBr壓片,用美國(guó)Nicolet公司AV360型傅里葉紅外光譜儀測(cè)定,測(cè)量范圍400~4 000 cm-1;紫外光譜采用北京普析通用儀器有限責(zé)任公司TU-1901紫外可見分光光度計(jì)測(cè)量,測(cè)量范圍190~900 nm;熱重分析采用日本島津公司產(chǎn)TA-60型差熱分析儀,升溫速度為10℃;晶體結(jié)構(gòu)采用德國(guó)Bruker Smart CCD X單晶衍射儀測(cè)定.

        1.2 化合物的合成

        將H3PW12O40(0.22 g,0.076 mmol),Cu(CH3CO2)2·H2O (0.15 g,0.75 mmol),2,2′-bipy(0.10 g,0.64 mmol)溶解于10 mL H2O中,充分?jǐn)嚢杈鶆?,? mol/L的鹽酸調(diào)節(jié)pH值至6.5,然后將溶液轉(zhuǎn)移到25 mL的聚四氟乙烯反應(yīng)釜中,填充度為60%,在160℃條件下晶化5 d,自然冷卻至室溫.過濾得到黑色塊狀晶體C60H56Cu3N12O44PW12.元素分析(單位為質(zhì)量分?jǐn)?shù)/%,括號(hào)內(nèi)為計(jì)算值):C 17.66 (17.54),N 4.12 (4.21),H 1.37 (1.29).

        1.3 晶體結(jié)構(gòu)的測(cè)定

        選取大小為0.29 mm×0.26 mm×0.22 mm的晶體用于單晶結(jié)構(gòu)分析.晶體的X射線衍射數(shù)據(jù)在德國(guó)Bruker Smart CCD X單晶衍射儀上收取,在1.47<θ<26.05°范圍內(nèi),采用直接法以SHELXTL-97程序解出,全矩陣最小二乘法修正[26].結(jié)果表明:晶體屬于單斜晶系,P2(1)/n空間群;晶胞參數(shù)a=1.890 4 nm,b=2.047 8 nm,c=2.172 8 nm,α=90°,β=96.404°,γ=90°,V=8.358 9 nm3,Z=4,R1=0.050 2,wR2=0.117 1.

        2 結(jié)果與討論

        2.1 晶體結(jié)構(gòu)

        標(biāo)題化合物是由一個(gè)雙支撐Keggin型[((2,2′-bipy)2Cu)2PW12O40]-陰離子、一個(gè)分離的[Cu(2,2′-bipy)2]+陽(yáng)離子和4個(gè)溶劑水組合而成,[((2,2′-bipy)2Cu)2PW12O40]-通過過渡金屬Cu將陰離子簇[PW12O40]3-與2個(gè)2,2′-bipy組裝到一起,如圖1所示.雜多陰離子[((2,2′-bipy)2Cu)2PW12O40]-是由典型的Keggin型[PW12O40]3-陰離子和2個(gè)復(fù)雜的[(2,2′-bipy)2Cu]+基團(tuán)組合而成.在Keggin型[PW12O40]3-陰離子模型中包含一個(gè)稍微扭曲的PO4四面體,圍繞著四面體周圍的是12個(gè)WO6八面體.P—O鍵長(zhǎng)范圍為0.153 0(9)~0.153 5(9) nm,∠O—P—O范圍為109.0(5)°~109.5(5)°.W—O鍵長(zhǎng)范圍為0.169 7(9)~0.249 2(8) nm,∠O—W—O范圍為71.3(3)°~173.0(5)°.鍵價(jià)計(jì)算(BVS)表明[27],陰離子[PW12O40]3-中的P和W的價(jià)態(tài)分別是+5和+6價(jià),陽(yáng)離子[Cu(2,2′-bipy)2]+中Cu的價(jià)態(tài)是+1價(jià),并且3個(gè)Cu的價(jià)態(tài)都一樣.考慮元素分析、電荷平衡和配位體系,該有機(jī)-無(wú)機(jī)雜化多金屬氧酸鹽晶體化合物的化學(xué)分子式確定為[(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O.磷鎢多氧陰離子作為二齒配體,通過橋氧原子與[Cu(2,2′-bipy)2]+陽(yáng)離子進(jìn)行配位,Cu—O鍵長(zhǎng)分別為0.210 5(9)和0.224 3(9) nm,Cu(1)與Cu(2)分別與來(lái)自2個(gè)2,2′-bipy的4個(gè)N原子和1個(gè)[PW12O40]3-陰離子的氧原子形成5配位環(huán)境,Cu—N鍵長(zhǎng)范圍為0.197(3)~0.212(3) nm.在被分離的陽(yáng)離子[Cu(2,2′-bipy)2]+中,Cu(3)的化合價(jià)被確定為+1價(jià),Cu(3)與來(lái)自2個(gè)2,2′-bipy的4個(gè)N原子相連構(gòu)成四配位體系,Cu—N鍵長(zhǎng)范圍為0.201(3)~0.206(3) nm,Cu(3)與4個(gè)N原子構(gòu)成扭曲的四面體結(jié)構(gòu).化合物的主要鍵長(zhǎng)和鍵角見表1.

        圖1 標(biāo)題化合物的晶體結(jié)構(gòu)

        化學(xué)鍵鍵長(zhǎng)/nm化學(xué)鍵鍵角/(°)W(1)—O(36)0.172(2)O(36)—W(1)—O(10)102.2(9)W(1)—O(19)0.1914(19)O(36)—W(1)—O(19)101.5(10)W(1)—O(18)0.194(2)O(10)—W(1)—O(19)86.6(9)W(2)—O(7)0.1722(19)O(36)—W(1)—O(3)102.0(9)W(2)—O(29)0.1896(17)O(10)—W(1)—O(3)155.8(8)W(2)—O(30)0.1887(19)O(19)—W(1)—O(3)88.3(8)W(3)—O(33)0.1697(19)O(3)—W(1)—O(18)87.7(8)W(3)—O(4)0.1899(18)O(7)—W(2)—O(29)101.0(9)W(3)—O(12)0.1905(19)O(30)—W(2)—O(20)89.0(8)

        在晶體結(jié)構(gòu)中,存在著分子內(nèi)氫鍵和分子間氫鍵(見表2).沿著bc面看,分子內(nèi)氫鍵有2種形式構(gòu)成:一是晶格水分子提供H原子與相鄰雜多陰離子的橋氧(O(23))和(O(34))之間形成的O(3w)—H(3A)…O(23)和O(1w)—H(1B)…O(34)氫鍵;二是2個(gè)結(jié)晶水中的2個(gè)氧(OW)形成的O(3w)—H(3B)…O(4w)氫鍵.分子間的氫鍵是水分子與雜氧陰離子的氧形成的O(1w)—H(1B)…O(34)和O(1w)—H(1A)…O(40)氫鍵.2個(gè)相鄰的雜多陰離子[((2,2′-bipy)2Cu)2PW12O40]-上的2,2′-bipy基團(tuán)之間存在π-π堆積作用,苯環(huán)之間的質(zhì)心距離為0.339 nm,化合物通過氫鍵作用和π-π堆積作用最終形成超分子網(wǎng)絡(luò)結(jié)構(gòu).

        表2 標(biāo)題化合物的氫鍵參數(shù)

        對(duì)稱操作:#1為-x+1,-y+1,-z;#2為-x+1/2,y-1/2,-z+1/2;#3為-x+1,-y+1,-z+1.

        2.2 形貌分析

        將化合物粉晶放在雙面導(dǎo)電膠上,進(jìn)行噴金處理后,用掃描電子顯微鏡對(duì)其不同表面形貌進(jìn)行分析,形貌見圖2.從圖2b看出,晶體中有大量孔隙,這種孔隙應(yīng)該具有吸附作用,作為催化劑時(shí)可以增大表面積,提高催化效率.

        2.3 紅外光譜分析

        圖3 標(biāo)題化合物的紅外光譜

        圖4 標(biāo)題化合物的紫外光譜

        2.4 紫外-可見光譜分析

        2.5 熱重分析

        標(biāo)題化合物的熱重分析是在室溫條件下,空氣中測(cè)定的.化合物在25℃~600℃之間存在2步失重,總失重為24.92%,與理論失重24.72%一致.第1步失重約為1.83%,對(duì)應(yīng)著化合物中水的失去 (1.77%);第2步在375℃~600℃失重為23.09%,歸屬于配體2,2′-bipy的失去[24-25,31].

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        [9] HUSSAIN F,SANDRIESSER S,SPELDRICH M,et al. A new series of lanthanoid containing Keggin-type germanotungstates with acetate chelators:[{Ln(CH3COO)Ge W11O39(H2O)}2]12-{Ln=EuⅢ,GdⅢ,TbⅢ,DyⅢ,HoⅢ,ErⅢ,TmⅢ,and YbⅢ}[J]. J Solid State Chem,2011,184:214-219.

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        [11] YAO S,ZHANG Z M,LI Y G,et al. A {Cu6}-containing inorganic-metal-organic sandwich-type tungstoantimonite and its 3D supramolecular framework[J]. Inorg Chem Commun,2009,12:937-940.

        [12] YAN B B,HONDSDON S A,LI Y F,et al. Synthesis,structures and properties of new hybrid solids containing ruthenium complexes and polyoxometalates[J]. J Solid State Chem,2011,184:3179-3184.

        [13] ZHANG L Z,GU W,DONG Z L,et al. Syntheses,structures and properties of a series of photochromic hybrids based on Keggin tungstophosphates[J]. J Solid State Chem,2009,182:1040-1044.

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        Abstract:A novel inorganic-organic hybrid material [(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O has been hydrothermally synthesized and structurally characterized by elemental analysis,scanning electron microscope,IR spectrum,UV-Vis,TGA-DSC and single-crystal X-ray diffraction. Crystal data:monoclinic,space groupP2(1)/n,a=1.890 4 nm,b=2.047 8 nm,c=2.172 8 nm,α=90°,β=96.404°,γ=90°,V=8.358 9 nm3,Z=4,R1=0.050 2,wR2=0.117 1.

        Keywords:polyoxometalate;inorganic-organic hybrid material;crystal structure;hydrothermal synthesis

        (責(zé)任編輯:石紹慶)

        Hydrothermal synthesis and structure characterization of a novel hybrid material [(2,2′-bipy)2Cu][((2,2′-bipy)2Cu)2PW12O40]·4H2O

        ZHANG Ke1,MA Yun-fei1,SUN Yi-ting1,WANG Rui-ku1,F(xiàn)ENG Yin-di2,
        LIU Shuang-ying1,MA Zhuo-qi1,LUAN Guo-you3

        (1.Jilin Province Water Resource and Hydropower Consultaive Company,Changchun 130012,China;2.Modern Tianfeng Agriculture Grouplimtied Company,Changchun 130000,China;3.College of Resource and Environment Science,Jilin Agriculture University,Changchun 130118,China)

        1000-1832(2014)03-0099-06

        10.11672/dbsdzk2014-03-019

        2013-09-13

        全球環(huán)境基金資助項(xiàng)目(4632);吉林農(nóng)業(yè)大學(xué)科研啟動(dòng)基金資助項(xiàng)目(201218).

        張科(1982—),男,碩士研究生;通訊作者:欒國(guó)有(1968—),男,教授,主要從事多酸化學(xué)研究.

        O 611.4 [學(xué)科代碼] 150·10

        A

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