第23卷第4期 2012年7月 化学 研究 中国科技核心期刊 hxyi@henu.edu.cn CHEMICAL RESEARCH Synthesis and structure characterization of an organic— inorganic complex mono—cerium(IV)substituted sandwich—type ph0sph0tungstate with Keggin structure WANG Yong—gang ,LUO Jie ,SHI Dong—ying ,WANG Zhi—qiao ,ZHAO Jun-wei (1.College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China; 2.No.1 Senior Middle School of Zhoukou,Zhoukou 466000,Henan,China) Abstract:An organic—inorganic complex mono—Ce V substituted sandwich—type phosphotungstate [(H2 dap)2]2.5 H 5 ICe(a-Pwl1 O39)2]・11.5H 2 O(1;dap一1,2-diaminopropane)was prepared under hydrothermal conditions.The structure of as—synthesized product was characterized by means of elemental analysis,infrared spectrometry and single—crystal X—ray diffraction.Results indicate that 1 crystallizes in the triclinic P一1 space group with n一1-254 9(7)nm,b一 1.915 9(11)nm,c=2.129 0(12)nm,a一68.426(10)。, 一88.320(10)。,y一89.853 (10)。,V一4.758(5)nm。,Z一2,D 一4.116 g/cm。,GOOF一1.022,R1—0.111 2,and wR 2—0.218 9.Besides,the molecule of 1 is composed of 1 crystal1ographically independent mono—CeⅣsubstituted sandwich-type ICe(coPW11O39)2] 一polyoxoanion,2.5 discrete diproto— nated[H 2 dap] cations,5 protons and 1 1.5 lattice water molecules. Keywords:Keggin structure; mono—cerium substitution; phosphotungstate; synthesis; struc— ture characterization CLC number:O 614.3 Document code:A Article ID:1008—1011(2012)04—0009—05 一种具有Keggin结构的有机一无机复合的单铈 取代夹心型磷钨酸盐的合成及其结构表征 王永刚 ,罗 婕 ,史岽瑛 ,王志巧 ,赵俊伟 (1.河南大学化学化工学院,河南开封475004; 2.周口市第一高级中学,河南周口466000) 摘 要:在水热条件下合成了一种具有Keggin结构的有机一无机复合的单铈取代夹心型磷钨酸盐[H dap] H 一 [Ce( PW O。。) ]・11.5H O(1);利用元素分析、红外光谱和单晶x射线衍射表征了其结构.结果表明,化合物 1属于三斜晶系,P一1空间群,晶胞参数为:。一1.254 9(7)nrn,b=1.915 9(11)nlTl,C一2.129 0(12)nm, 口一68.426(10)。,口一88.320(10)。,y一89.853(10)。,V一4.758(5)rim。,Z一2,D 一4.116 g/cm。, GOOF一1.022,R 一0.111 2,wRz一0.218 9.化合物1分子由1个晶体学单铈取代夹心型[Ce(wPw 一 O。。)z] 磷钨酸多阴离子,2.5个双质子化的[H dap] ’。阳离子,5个质子及1I.5个结晶水分子组成. 关键词:Keggin结构;单铈取代;磷钨酸盐;合成;结构表征 Currently,more and more research activities of polyoxometalate(POM)chemistry are greatly driven not only by their rich structure diversities and remarkable characteristics but also by their potential applica— Received date:20l1~12—28. Foundation item:Supported by the Natural Science Foundation of China(2l101055),China Postdoctora1 Science Foundation(201104392, 2O100470996),the Natura1 Science Foundation of Henan Province(1O2300410093)and the Foundation of Education Department of Henan Province(2009A150003.2010B150006). Biography:WANG Yong—gang(1979一),male,bachelor,majoring in polyoxometalate—based functional materials. Corresponding au— thor,E—mail:zhaojunwei@henu.edu.cn. 10 化学研究 2012正 tions in many fields such as catalysis,medicine,materials science and so on[i-4].Since monovacant Keggin species([Pwl1 O39] ,[siw1l o39] and[GeW1l O39] 一)were reported[引,various systems containing lanthanide(Ln)cations and monovacant P0M units have been exploited.In 1971,PEACOCK and WEAKLEY first put forward that the combination of monovacant Keggin polyoxoanions Exw1l o39]一(x —siw,P )with Ln cations can form both 1:1-type and 1:2一type derivatives in solution[ .Based on known[U(GeW11 O39)] reported by TOURNI ̄and co—workers in 1980[ ,BLASSE et al predicted the presence of 1:2-type[Ln(SiW11 O39)2]¨一series[ .In 2007,KORTZ et al prepared a series of mono—Ln substituted 一Keggin silicotungstates[Ln(/?2一SiW11 O39)2]”一(Ln—La ,Ce ,Sm ,Eu ,Gd ,Tb , Yb ,Lu )by reaction of Ln ions with the precursors[ 一SiW11 O39]。一in 1 mol・L一 KCI medium[ . Since 2004,we have considerably focused on the reactions of lacunary polyoxotungstate(POT)precursors with Ln cations in the presence of organic components,hoping to obtain organic—inorganic complex Ln-sub— stituted POTs with unexpected structures and properties.This is driven by two considerations.On the one hand,Ln cations have strongeraffinity for the basic oxygen atoms at the defect sites in lacunary POT pre— .cursors than the transition—metal cations.On the other hand,introducing organic components makes it lea— sible to alter and tune the microstructure of inorganic component,thereby providing more choices for con— structing desired structures.In 2006,we reported three one dimensionaI(1D)and two dimensionaI(2D) organic—inorganic hybrid monovacant Keggin-type s订icotungstates and germanotungstates such as Lnm cat- ions[Sm(H2O)6]。25Sm(H2O)5] 5H {Sm(H2O) ESm(H 2O)2(DMSO)(a-SiW O。。)]}・4.5H O(DM— SO refers to dimethylsulfoxide),EDy(H 2 O)4]。_¨5[-Dy(H2 0)6]0_¨5 Ho.5{Dy(Hz O)7[-Dy(H2 O)2(DMSO)(or GeW11O3。)]}.5.25H 2 O and H{[Sm(Hz O)I_5(DMF)。l5]2[Sm(H2 O)2(DMF)][Sm(H2 O)。(旷SiW 039)]2}(DMF—N,N—dimethyl formamide)_1 .In 2009,we reported two 2:2 type of mono—Ln substi— tuted POMs[{(ocPW11 O39 H)Ln(H2O)3)2]。(Ln—Nd ,Gd )and[{(a-PW11 O39)Ln(H 2 O)(叩。, 一1,1) CH 3COO)2] 。一(Ln—Sm ,Eu ,Gd ,Tb ,Ho and Er )_11j.In the present paper,we address another organic—inorganic complex mono—Ce substituted sandwich—type phosphotungstate[(H2 dap)2]2 5 H5 FCe(a-Pw11O。。)2]・11.5H2O(1)(CCDC:844564). 1 Experimental 1.1 Physical measurements Elemental analyses(C,H,and N)were performed with a Perkin—Elmer 240C elemental analyzer.In— frared(IR)spectrum was recorded from a sample powder palletized with KBr with a Nicoletl70 SXFT—IR spectrometer over the range of 4 000—400 cm~.Na9[a-PW9 O34]・7 H2 O was prepared according to the method in 1iterature[ ]and confirmed bv IR analysis.All reagents were obtained from commercial re— sources and used without further purification. 1.2 Synthesis of 1 Na9[旷Pw9O34]・7H20(O.246 g,0.096 mmo1), CuC12・2H2O(O.102 g,0.640 mmo1)and[(NH4)2 dissolved in 5 mL of water.followed by the addition SO4]2Ce(SO4)2・2H2O(O.108 g,0.170 mmo1)were of dap(0.05 mL,0.579 mmo1)under stirring.The mixture was stirred for 2 h,sealed in a Teflon-lined stainless steel autoclave(25 mL)。kept at 16O℃for 5 days and then cooled to room temperature.Brown needle crystals were filtered,washed with distilled water and dried in air at ambient temperature.Yield: ca.25 (based on Na9-PW9O34]・7H2O).Ana1.calcd.( )for C7.5oH58CeN5O89.5oP2W22:C,1.53; H,0.99;N,1.19.Found( ):C,1.61;H,1.09;N,1.O7. 1.3 X—ray crystallOgraphy A good single crystal for 1 was carefully selected under an optical microscope and glued at the tip of a thin glass fiber with cyanoacrylate adhesive.Intensity data were collected with a Bruker APEX—II CCD de— tector at 296(2)K(Mo K radiation; 一0.071 073 nm).Intensity data were corrected for Lorentz and 第4期 王永刚等:一种具有Keggin结构的有机一无机复合的单铈取代夹心型磷钨酸盐的合成及其结构表征 11 polarization effects as wel1 as for empirical absorption.The structure was solved by direct methods and re— fined by the full—matrix least—squares method on F using the SHELXTL~97 package[ 。].The remaining at— oms were found from successive full—matrix least—squares refinements on F and Fourier syntheses.A1l the non—hydrogen atoms were refined anisotropically.All the hydrogen atoms associated with the dap mole— cules were placed in idealized positions and refined with a riding model using default SHELXL parameters. Those hydrogen atoms attached to lattice water molecules were not located.The crystal1ographic data and structural refinements for 1 are listed in Tab】e 1. Table 1 CrystaI10graphic data and structural refinements of 1 Item Parameter Item Parameter Formula Mr C7 5 H 58CePzW22N5O89 5 5 897.35 D (g・cm。) Absorption coefficient(mm ) 4.116 27.081 T/K 296(2) Ff000) 5 140 A/nm 0.071 073 0 range for data collection(。) 1.14—25.OO Crysta1 system Space group triclinic P~1 Limiting indices Reflections collected 一14≤^≤14,一22≤k≤22,一25≤Z≤21 23 704 a/nm 1.254 9(7), Independent reflections 1 6 501 6/nm c/nm a/。 1.915 9(11) 2.129 0(12) 68.43 R Max.min.transmission Refinement method O.132 2 0.140 8 and 0.043 6 Full—matrix least—squares on F 8/。y/。88.32 89.85 Data/restraints/parameters 16 501/167/840 Goodness of—fit on F R indices(all data) 1.022 R1—0.268 1,wR 2—0.243 5 V/nm。Z 4.758(5) 2 Final R indices[I>2a(D] R1—0.111 2,wR2—0.218 9 2 Results and discussion 2.1 Synthesis Based on our previous findings on Ln substituted lacunary silicotungstates and germanotungstates ̄ , we further developed the synthetic strategy of the combination of lacunary phosphotungstates with Ln cat— ions.We chose lacunary phosphotungstate precursor Na9[oc PW9 O34]・7 H2 O as the starting material to re— act with Ln cations under different conditions.Two novel 2D organic—inorganic hybrid lacunary Keggin phosphotungstate 3d~4f heterometallic derivatives,[Cu(en)2]2H6[Ce(ocPW11O39)2]・8H2O and[Cu(dap)2 (H20)][cu(dap)2]4.5[Dy(o:-PW1lO39)2]・4H2O,were first prepared .During the course of preparing [-Cu(en)z]2H 6[Ce(crPW1lO39)2]・8H2O,when the molar ratio of Na9[旷PW9O34]・7H2O:CuC12・2H2O。 [(NH4)2SO4]2Ce(SO4)2・2H2O:H2O was set at 0.096:0.640:0.170:278 in the presence of dap(0.05 mL,0.579 mmo1),1 was obtained.Notably,although CuCI2・2 H2 O was used as a starting material in the reaction,no Cu ion was detected in 1.The specific role of CuC1,iS still not well understood,and we sup— pose that CuC12 may have synergistic actions with other components in the reaction system.Similar phe— nomena have been previously encountered .For example,during the course of preparing{Fe28}wheel K2Na18 Fe28( 3一O8)(L一(一)一tart)1 6(CH3COO)24・29H 2 O,though Gd(NO3)3・6H 2 O was also introduced to the reaction system,no Gd。 ion was observed in the product[ 2.2 Description of crystal structure . Single—crystal X—ray diffraction structural analysis indicates that the molecule of 1 consists of 1 crystal— lographically independent mono—CeⅣsubstituted 1:2 type sandwich—type ICe(a-PWll 039)2] 一subunit, 2.5 discrete diprotonated EH2dap]抖cations,5 protons and 11.5 lattice water molecules(Fig.1).The 1: 2一type[-Ce(ocPWll O39)2] 一subunit is constructed from two monovacant Keggin[旷PW11 O39] 一moieties linked by a Ce cation,resulting in a well—known sandwich—type bis(undecatungstophosphate)lanthanate structure.The CeⅣcation occupies the defect sites of two[a-PW1l O39] moieties and exhibits a distorted square antiprismatic geometry(Fig.2).In the distorted square antiprismatic geometry.four O atoms(O1. 第4期 4 一种具有Keggin结构的有机一无机复合的单铈取代夹心型磷钨酸盐的合成及其结构表征 2.2 IR spectrum In the IR spectrum of 1,four groups of characteristic vibration bands derived from the monovacant Keggin—type framework(at 944 cm一 ;1 097 and 1 052 cm ;889 cm一 ;830,765,and 720 cm一 )are as— cribed to v(W—O ),v(P—O ),v(W—Ob)and (W—O ),respectively,which are in good consistence with the IR data of monovacant Keggin—type phosphotungstates[。引. Compared with the IR spectrum of Na7Pwl】O39・nH2O[954 cm一 ;1 099 and 1 042 cm~ ;865 cm一 ;809 and 728 cm一 for (w—O ), (P— O ),v(w—Ob)and (w—O )] H],the v(w—Ob)and v(w—O。)vibration peaks of 1 have different hy— pochromati shifts,which is probably related to the incorporation of the Ce cation into the vacant sites of two[a-PW11O39] 一moieties leading to the formation of ICe(a-Pwl1O39)2] 一subunit.Furthermore,the signals at 3 315 and 2 960 cm1。are attributed to the v(NH2)and v(CH2)stretching vibration,whereas the resonances at 1 588 and 1 470 cm一 are assigned to the (NH2)and (CH 2)bending vibrations.These characteristic vibration resonances confirm the existence of dap in 1.The vibration band at 3 4 5 6 cm sug— gests the presence of water molecules.In one word,the IR results are in good agreement with those of ray diffraction. 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