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双(1-甲基咪唑-2-基)甲酮、双(1-甲基咪唑-2-基)甲烷及双(1-甲基咪唑-2-基)乙烯与第六族羰基金属

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第26卷 1期 2010年1月 无 机 化 学 学 报 V【J1.26 No.1 】一7 CttlNESE JOURNAI OF INORGANIC CHEMISTR't 双(1.甲基咪唑.2.基)甲酮、双(1.甲基咪唑-2.基)甲烷及双 (1.甲基咪唑.2.基)乙烯与第六族羰基金属化合物的反应研究 张晓燕 丁 可 宋海斌 唐良富 f南开大学化学系,元素有机化学国家重点实验室,天津 300071) 摘要:本文研究了羰基钥(钨) 双(1一甲基咪唑一2.基)甲酮和双(1一甲基眯唑一2.基)旰1烷以及双f1.甲基眯唑一2一基)乙烯的反应,荻碍 了6个双齿螫台的双(1一甲基咪唑.2 基)甲酮,8(1.甲基咪唑一2一基)甲烷和双(1.甲基咪唑一2一基J乙烯四羰基金属衍生物,以及1个 单齿配值的双f1一叶{基眯唑.2一基1乙烯五羰基钨化合物。它们的结构通过红外,核磁以及X-射线单品衍射分析得到确证 .所有这 些新化合物的电化学测试表目Jj.它仃J只存在一个不可逆的氧化过程。 关键词:1一甲基眯唑:品体结构;第六族羰基金属化合物 中图YY ̄g-:0614.61+2;0614.61+3 文献标识码:A 文章编号:1001—4861(2010)01—0001—07 Reactivity of(Mim)2C=O,(Mim)2CH2 and(MimhC=CH2 (Mim=l-Methylimidazole-2-y1)with Group 6 Metal Carbonyl Complexes ZHANG Xiao—Yan DING Ke SONG Hai—Bin TANG Liang—Fu (Departmem(fChenKstr).State Ke)Laboratory ofElernento—Organic ChemL ̄try, (mkai Unii ersit)',Ticmjin 300071) Abstract:Reaction of bis(1.methylimidazole一2一y1)ketone『(mim)2C=o1,bis(1一methylimidazole一2一y1)methane 【(mim)2CH2】and bis(1一methylimidazole一2一y1)ethene【(mim)2C=CH2】with M(CO)5I (M=Mo or W;L=CO or THF)has been investigated in this paper which yields six bidentate chelating complexes(co)4M(mim)aC=O,(CO)aM(mim)2CH2 and(CO)4M(miar)2C=CH2 as well as a monosubstituted pentacarbonyl tungsten derivative(co)5w(mim)2C=CH2. These complexes have been characterized by IR and NMR spectroscopy,and their structures have been further confirmed by X—ray crystal diffraction.The electrochemical behavior investigated by cyclic vohammetry indicates that these newly synthesized complexes exhibit one irrevm’sible oxidative process.CCDC:740160.7:740161.10. Key words:1一meth) limidazole:co,sial structure;group 6 metal carbonyl complex As a kind o1 stable and flexible bidentate ligands (pyrazol一1一y1)methanes on the methine carbon atoms dis— play unusual reactivity upon treatment with W(C0 . As the isoelectronic and isoste ̄‘ic ligand of pyrazote, imidazote as well as its coordination behavior toward main group[ j and transition metals I 1 has been widely bis(pyrazol一1一y1)methanes have been extensively inves— tigatedllI.In recent years。the modiifcation of bis(pyrazol 一1-y1)methanes by organic filnctional groups on the bridging carbon atoms has also drawn extensive atten— tionl 一 .As part of the studies on this meaningful topic. our recent investigations show that funetionalized bis investigated owing to many metalloenzymes containing this type of ligand and its derivatives.The replacement 收稿t:l期:2009 07一l8收修改稿口期:2009.1 1.19 同家自然科学基金( 0.20672059,20721062) ̄助课题 通讯联系人。E-mail:lftang@nankai.edu cn;会员登|己号:S060015703M 第一作者:张晓燕,女,27岁,博十研究生;研究方向:金属有机化学 2 无机化学学报 第26卷 of pyrazole by 1-methylimidazole to form bis f l in dioxane(100 mE)was stirred at reflux for 48 h.The reaction mixture was filtered off,and the filtrate was methylimidazole一2一y1)methane has been described in the literature[71.This ligand has been expected t0 act as a good donor to various main group and transition metals ̄串 due to the stronger donating ability of imidaz. ole,compared with that of pyrazolet 阍.Along with the subtle distinction on the coordination abilitv.bis (pyrazol一1一y1)methane and bis(1-methylimidazole一2.yl1 methane also exhibit some analogous strueturaI features.For instance,they often act as chelating bidentate ligands upon coordinating to metals,and their bridging carbon atoms can be modified by organic functional groups to form new polydentate ligands.As an extension of our investigations on bis(pyrazol一1一y1) methane,herein we repo ̄the related reactions of bis(1~ methylimidazole一2-y1)ketone,bis f1-methylimidazole一2. y1)methane and bis(1..methylimidazole..2..y1)ethene with M(CO)6 fM=Mo or W). 1 Experimental All reagents are of analytical grade and were used without further puriifcation.Ligands(mim)2C=O(1)and (mim)2CH2(2)(mim=l—methylimidazole一2一y1)m were prepared by the published methods.Solvents were dried by standard methods and distilled prior to use.A1l reactions were carried out under an argon atmosphere. NMR spectra were recorded Oil a Braker 400 spectro— meter,and the chemical shitfs are reported in ppm with respect to the reference finternal SiMe4 for H and C NMR).IR spectroscopic data were obtained from a Nicolet 380 spectrometer as KBr pellets.Elemental analyses were carried out on a Yanaco CHN Corder MT.3 elemental analyzer. Cyclic vohammetrie experiments were performed on a LK 2005 electro— chemical analyzer equipped with a three—electrode assembly.The working electrode was a Pt disk =2 mm),and the referenee was a SCE electrode.A Pt iflament was used as an auxiliary electrode. Electrochemical data reported here are related to those of the ferrocenium/ferrocene redox couple. 1.1 Synthesis of ligand(miar)2C=CH2(3) The mixture of ligand 1 (1.0 g,5.3 mmo1), PhsPCH3I(2.2 g,5.5 mmo1)and K2CO3(0.9 g,6.5 mmo1) concentrated to dryness to yield yellow VISCOUS oil.The residual oil was puriifed by column chromatography on silica using acetone as eluent.The eluate was concentrated to dryness to give white solids of 3.Yield: 0.68 g(69%). H NMR(CDC13): 3.23(s,6H,CH3), 5.88(s,2H,CH2),6.83,6.96(s,s,2H,2H,protons of iinidazole ring)ppm.These data are compared to those reported previously .”C NMR(CDCI3):6 33.4(CH3), 122.5,123.9,128.4,128.8,145.5(CH,:C and carb0ns of imidazole ring)ppm. 1.2 Synthesis of(CO),lVlo(mim)2C=O(4) A solution of Mo(co)6(0.13 g,0.5 mmo1)and ligand 1(95 mg,O.5 mmo1)dissolved in THF(30 mL) was stirred at reflux for 5 h.After the reaction was complete,the solvent was removed in vacuo,and the residual solid was puriifed by column chromatography on silica using CH2Cl2 as eluent.The eluate was concentrated to dryness under reduced pressure,and the residue was reerystallized from CH2C1Jhexane to give purple complex 4.Yield:0.1 7 g f85%1. H NMR (DMSO一 :6 4.05(s,6H,CH3),7.41,7.78(s,s,2H, 2H,protons of imidazole ring)ppm. 3C NMR fDMSO. d6): 37.9(CH3),129.3,132.9,141.0 fcarbons of imi— dazole irng),1 67.8(C=0),205.2,220.8(C;O)ppm. IR//(C兰O):2018,l 919,1 855,l 801 cm~。 (C=01: l 628 am~.Ana1.Caled.for C13H10MoN405・0.5CH2C12 (%):C 36.80,H 2.52,N 12.71;found f%):C 36.76,H 2.91.N 12.62. 1.3 Synthesis of(CO)4W(mim)2C=O(5) Ligand 1(95 mg,0.5 mmo1)was added to a solution of W(CO)sTHF in THF,prepared in situ by irradiation of a solution of W(CO)6(0.18 g,0.5 mmo1)in THF(30 mE)for 8 h,and the mixture was stired and heated at reflux for 5 h.The solvent was removed under a reduced pressure.The residual solid was puriifed by column chromatography on silica using CH2ClJhexane (3:l,V/V)as eluent.The eluate was concentrated to dryness again,and the residual solid was recrystallized from CH2CIJhexane to give purple complex 5.Yield: 0.1 8 g(74%).。H NMR(DMSO—d6): 4.06(s,6H,CH3), 7.54,7.82(s,s,2H,2H,protons of imidazole ring)ppm. 第1期 张晓燕等:双(1-甲基眯唑一2一基)甲 、双(1一甲基眯唑一2一基)甲烷及双 fl一甲基眯唑一2一基1乙烯与第六族羰基金属化合物的反应研究 3 ”C NMR(DMSO—d ):6 38.0(CH3),129.8,133.5,l41.8 (carbons of imidazole ring),167.5(C=0),202.3,212.9 (C 0)ppm.IR (C 0):2 010,l 906,1 848,1 797 em~, (C=()):1 629 em~.Ana1.Calcd.for Cl3Hl( OsW. 0.5CH,CI,f%1:c 30.68,H 2.10,N 10.60;found(%):C 30.21.H 2.45.N l0.27. 1.4 Synthesis of(CO)4Mo(mim)2CH2(6) This eomplex was similarly obtained as above— mentioned for complex 4 as a yellow—green solid.while ligand 1 was replaced by ligand 2.The eluent was CH2Cl2/ethyl acetate(1 0:1,V/V).and this complex was reerystallized from acetone.Yield:72%. H NMR (acetone—d :6 3.88(s,6H,CH3),4.23(s,2H.CH2), 7.04,7.16(s,s.2 H_2H,protons of imidazole ring)ppm. ”C NMR(acetone—rl^):6 23.6(CH!),34.0(CH3),122.5, 1 3 1.6.144.0 fcarbons of imidazole ring).207.9.222.5 (C 0)ppm.IR (C 0):2 005 1 895,l 848.1 795 cln-i.Ana1.Calcd.for Cl3Hl2MoN4O4(%):C 40.64,H 3.15.N 14.58;found(%):C 40.15.H 3.65.N l4.38. 1.5 Synthesis of(Co) W(mim)2CH2(7) This complex was similarly obtained as above— mentioned for complex 5 as a yellow solid.while ligand 1 was replaced by ligand 2.The reaction time was 1 0 h. and the eluent was ethvl acetate/acet0ne f3:1.V/V).and this complex was recrystallized from acetone.Yield: 64%. H NMR(acetone—d6):6 3.93(s,6H.CH3),4-29(s, 2H,CH2),7.1 8(s,4H,protons of imidazole ring)ppm. ”C NMR(acetone—d6):6 24.2(CH!),34.1(CH3),1 22.8, l32.3,l44.3 fcarbons of imidazole ring).205.0.214.5 (C 0)ppm.IR/2(C 0):2 002 1 877,1 846,l 792 cm-i.Ana1.Calcd.for Cl3Hl2N4O4W《%1:C 33.07,H 2.56.N l 1.87;found(%):C 32.65.H 3.01.N 1 1.45. 1.6 Synthesis of(CO)4Mo(mim)2C=CH2(8) This complex was similarly obtained as above— mentioned for complex 4 as a yellow solid, ̄hile ligand 1 was replaced by ligand 3.Yield:69%. H NMR (acetone一(I :6 3.83(s 6H,CH3).6.1 7(s,2H,CH2), 7.0l,7.1 5(s,s。2H.2H,protons of imidazole ring)ppm. ”C NMR(acetone—d :6 35.8(CH3.1 28.0,1 3 1.9,145.5 (carbons ofimidazole ring),l24.1,125.8(CH!=c),207.5, 222.2《C 0)ppm.IR/2(c 0):2 004 l 897。1 845, l 791 Cln-I.Ana1.Calcd.fnr Cl4Hl2MeN4O4・0.5CH2C11 (%):C 39.70.H 2.99,N l2.77;found f%1:C 39.36.H 2.86. l2.52. 1.7 Synthesis of(co)4W(mim)2C=CH2(9)and (CO)sW(mim)2C=CH2(10) Ligand 3(95 mg,0.5 mmo1)was added to a solution of w(co)sTHF in THF,prepared in situ by in ̄adiation of a solution of w(co)6(0.1 8 g,0.5 mmo1)in THF f30 mL1 for 8 h.and the mixture was stirred and heated at reflux for 10 h.The solvent was removed under a reduced pressure.The residual solid was puriifed by column chromatography on silica using CH,C1,as eluent to yield complex 9.After complex 9 was isolated.ethvl acetate was used as the eluent continuously to give complex 10. Data for complex 9:Yield:60%. H NMR facetone d :6 4.00(s,6H.CH3),6.37(s,2H,CH2),7.26,7.3 1 (d,d,J=1.2 Hz,2H,2H,protons of imidazole ring)ppm. C NMR(acetone—d :6 35.1(CH3),1 27.7,l 3 1.6,1 44.6 (carbons ofimidazole ring),l24.7,127.3(CH!=C),203.6, 213.3(C O)ppm.IR/2(C 0):1 997,l 885,1 834. 1 783 cnl 1.Ana1.Calcd.for Cl4Hl2N4O4W・0.5CH2CI2 (%):C 33.07,H 2.49,N 10.64;found(%):C 33.11,H 2.90.N 10.45.Data for complex 10:Yield:25%. H NMR(CDC1 ):6 3.62,3.79(s,s,3H,3H,CH3),5.78, 6.26(s,s,1 H,1 H.CH2),6.92,6.94,7.22,7.26(s,s s, s,1H,lH,lH 1H.protons of imidazole ring)ppm. ”C NMR(acetone—d6):6 35.0,35.2(CH3),124.9,125.6, 129.2,134.7.143.8,15 1.4(carbons of imidazole ring), l 23.3,l 29.9(CH2=C),199.2,202.7(C 0)ppm.IR z,fC 0):2068,l 953,l 897.1 862,1 844 cm~.Ana1. Calcd.for Cl5Hl2N4O5W(%):C 35.18,H 2.36,N 10.94; ofund(%1:C 34.75.H 2.67.N l1.08. 1.8 Conversion of complex 10 to 9 The solution of complex 10{60 mg,0.1 2 mmo1)in toluene(30 mL1 was stirred at reflux for 24 h.After removing the solvent.the residual solid was purified by column chromatography on silica using CH2C11 as eluent to give complex 9.Yield:50 mg f88%). 1.9 Structure determination of complexes 7 and 10 Yellow crystals of complexes 7 and 10 suitable for X-ray analysis were obtained by slow diffusion of hexane into their CH,C1,solutions at—l 8 c【=.Intensity data were collected on a SCX—MINI CCD diffractometer ofr 7 and a Rigaku Saturn CCD detector fo,・10 using 4 无机化学学报 第26卷 the to/20 scan technique,and a semi—empirical absorption correction was applied.The structures were solved by direct methods and refined by full—matrix least—squares on F .All non—hydrogen atoms were refined atoms were added geometrically and refined with riding model position parameters.A summary of the fundamental crystal data is listed in Table 1. CCDC:740160,7;740161,10. with anisotropic displacement parameters.Hydrogen Table 1 Crystallographic data and refinement parameters for complexes 7 and 10 2 ResulIs and discussion sli tly air-sensitive in solution,especially the molybdenum derivatives. 2.1 Reaction of(mim)2C=O and(mim)2CH2 with M(CO)5L(M=no or W;L=CO or THF) The reaction of bis(1 .methylimidazole..2..y1)ketone The IR spectra show the characteristic absorption peak of the ketone carbonyl stretching band at 1 628 cm一 for complex 4 and 1 629 cm~for complex 5, respectively.Four metal carbonyl stretching bands in the range of 1 792-2 01 8 cm~are observed in compl— 【(mim)2C=0(1)]and bis(1一methylimidazole一2一y1)metha— Be[(mim)2CH2(2)]with M(CO)5L(M--Mo or W;L=CO or THF)has been carried out under refluxing THF (Scheme 1),giving complexes 4-7 in moderate yields, which have been confirmed by IR and NMR spectra.as well as X—ray crystal diffraction analysis of 7.These exes 4-7,and these values of v(c E 0)can be compared with those reported previously for(N-N)M(CO)4 deriva— ifves fN・N represents substituted bis(pyrazol一1一y1)meth— ane)U61 indicating a typical c/s・-tetracarbonyl arrange-- ment.Their C NMR spectra also support the suggested structure.For example,two C metal carbonyl signals of equal intensity were detected,as expected. complexes have IOW solubility in chlorinated solvents. but soluble in strong polar solvents,such as acetone and DMSO.The newly synthesized complexes are 第1期 张晓燕等:双f1一甲基咪唑~2一基)甲酮、双(1一甲基咪唑.2.星1甲烷及双 『1一甲基咪唑一2一基1乙烯与第六旅碳基金属化合物的反应研究 clearly demonstrates that bis f I methvIimidaz0Ie一2一yl} methane acts as a chelating bidentate ligand to the O M(CO) tungsten atom.resulting in a boat conformation of six— membered metallaeyele similar to those in(N—N)M(CO)4 M=Mo f41.W(5 ~ / 、N M(CO) l_ derivatives .The tungsten atom is six—coordinate with Nlj・l{O K()H <\ ,M(CO) 一户 、 N a quasi—octahedral coordination geometry.The average W—N distance is 0.226 0 nm.comparable to those repor— ted in other tnngsten l0)complexes with chelating bidentate bis(pyrazol-1一y1)methane ligands fsuch as an average of 0.225 8 nm in CH!(3一CH3S一5-'BuPz)2w(co)4 M=Mol61,Wf7) (A)l 1 and 0.225 5 nm in CH2(3,5一Me:一4一C1Pz)2w(co)4 M{CO} (B ,respectively Pz=pyrazole).The bite angle f)f-N(1) WtCO)、 -W(1)一N(3)of 79.3(1)。is similar with that in complex B(79.4(2)。)lI7I.but slightly larger than that in complex 3 M=Mo(8),W(9) l0 A(76.1(1)。)【I6I_Two cis—carbonyls C(10)O(1)and c(13) Schenie l Relate{l reaction of(mim)2C=O….(mim) Ct 12 (2)an({【mim)2C=C}I 2(3) The structure of complex 7 has further been o(4)are distorted with the angles W(1)一C(10)一0(1)1 of 170.8(5)。and W(I)一c(13)一0(4)of 171.2(6)。.demonstra— ting the presence of sterie repulsion between the ligand confirmed by X—rav ClWstal difraction analysis. Selected I)ond distances and angles al・e listed in Table 2.The mwstal structure is illustrated in Fig.1.which and these cal‘bonyls.The angle C(10)一W(1)一C(13)of 1 69.2 f2)。is larger than the corresponding angle in complex A(1 60.4(3)。),reflecting that the steric repuls— Table 2 Selected bond distances(am)and angles(。J for complexes 7 and 10 ’(1)一Nf1) 0.225 8I4 、、 I1)一C¨21 0.I96 2(6 0.203 7(7 O.¨5】 Cf121—0(3) c(1 31—0(4) 0 I17 3l7 O.I14 1I7 I1l—N(31 0.226¨5 0.203 4(6 O.195¨6 《l1一CIl31 W(1)-C(10 CI1O1一Of1} C(I)一C(5) Cf5l—C{61 0.15O 0f8 Ol49 4 17 W(1).C(1 1 Cf1 11一O(21 0 115 4(7 (1)一Cf1O).0(1) Wl11一C【1 1)一0(2) W(1).CI12) 0(3) 70 79 78 71 Cf 1 1一C(51.C(61 l1.9{51 C(I21- ’f I)一N 3) 77 1fl1 C{1O)一、、 I11一C{13) 69 2{2) (:l12)一W(I).N j) C(I21一 {1)一C 13) 97 8¨1 CI lO)一、、(11一Nt31 Cl1 11一Wf1)一Nf1) C{l 1)一、、I1)一N{3) Complex 10 93.4f11 73.2(21 86.8(21 W(1)・C(131一()l41 N(1)一W(1)一NI3) 79.3I1) 94.5 2) )一Nf1 缪 226 5(3) 203 8(4) 205 7(3) 197 8{3) (I1.Q41 C 11一Of1 C 21—0(2 0.203 8(41 0 l I5 3(41 0 1 13 3f41 Cf41—0(41 C(8)一Cf1o1 cf10)一Cf1 11 0.I14 3(4l )-C(1 O.150 lf41 W }一c(2 0.132 9(51 0.145 9(41 W J_C(3 C 31—0(3 0 114 9(41 Cf1O1一c(12) W【1)-C{1)一O(I1 W【1)一C(2》一0(2) 172.9(3) 177.7f3} 179 6{3j l72 5f31 C{1)一 《11一C(4) Cf21一 I 1 1.C(51 70.0( 77 1( 87.9( C(8)一C(10)一C(1 11 C(8)一Cf1O)・c(12) l】8 4(3 1】5 ¨3 W【1)一C(3)一0(3) W(1)一Cf4)一O(4) Cf2)一 《11一N(I1 Cl3)-、、 l 11一C{41 l26 40 85.9( 75 8f W(1)一C(5).0(5 J 1 78.4t3) C(3)一W{】)一N(J) 6 无机化学学报 第26卷 ion of the ligand and carbonyls in complex 7 may be smaller than that in complex A,possibly owing to the absence of the substitution in the 4-position of imidazole ring. Fig.1 Molecular structure of complex 7 with the thermal ellipsoids drawn at the 30%probability level 2.2 Reaction of(mim)2C=CH2 with M(CO)sL The CO0rdination of the carbon.carbon double bond in alkene to group 6 metal carbonyl complexes is well—known .Thus bis(1一methylimidazole-2一y1)ethene [(mim)2C=CH2(3)】is expected to act as a chelating polydentate ligand through the olefinic double bond and imidazolyl nitrogen atoms.However,herein treatment of this ligand with Mo(CO)6 at refluxing THF only gives (C0)4Mo(mim)2C=CH2(8)in reasonable yield(see Scheme 1).On the other hand,the reaction of ligand 3 with W(co)5THF in refluxing THF yields(CO)4W (mim)2C=CH2(9)as the major product,with a certain amount of complex(CO)5W(mim)2C=CHz(10)formed. Moreover,complex 10 can convert to complex 9 in good yield upon treatment of this complex in refluxing toluene. The IR and C NMR spectra of complexes 8 and 9 are similar to those of complexes 4-7,implying that they possibly have similar structures.For example,four bands in the carbonyl stretching region,corresponding to the c/s.tetracarbonyl arrangement.are observed in these complexes,and the metal carbonyl carbons display two signals of equal intensity in their。。C NMR spectra.While the IR and C NMR spectra of complex 10 are significantly different from those of complexes 4 N9,suggesting a great change of the coordination mode of this ligand.A (C三O)band at 2 068 am~, corresponding to the A 1∞mode for the pseudo metal center in the M(CO)5 fragment[19-m],is observed in comp— lex 10.The”C NMR spectrum also support the mono. substituted pentacarbonyl structure,which shows two signals of the metal carbonyl carbon atoms with ca,a 1: 4 intensity ratio at ca,202.7 and 1 99.2 ppm.Moreover, two sets of proton signals of the ligand are observed in this complex,also consistent with the suggested structure. This result has been confirmed by the X—ray crystal analysis of complex 10.The molecular structure 0f 10 is presented in Fig.2,displaying that bis f 1一 methylimidazole--2・・y1)ethene acts as a monodentate ligand to the tungsten atom only through one imidazolyl nitrogen atom.The W—N distance is 0.226 5(3)nm,sim— ilar to that in complex 7(average 0.226 0 nm)and those reported in other octahedral tungstenf0)complexes with imidazole or pyrazole ligands,such as(L)2W(C0)4(L=I— phenacylimidazole,average 0.226 0 nm)口。 and f3一Me一5一 FcPz)W(CO)5(Fc=ferrocenyl,0.225 8 nm) .It is also worthy of note that the angles W(1)一C(1)一O(1)of 172.9(3)。,W(1)一C(4)一0(4)of 172.5(3)。and C(1)一w(1)一 C(4)of 1 70.0(1)。deviate signiifcantly from linearity, showing that the sterie repulsion between the ligand and carbonyls still exists in complex 10.Another feature is the separation between the w(co)5 fragment and the free imidazoly group,obviously to decrease Fig.2 Molecular structure of complex 10 with the thermal ellipsoids drawn at the 30%probability level 第l期 张晓燕等:双(1一甲基咪唑一2一基)甲酮、双(1.甲基咪唑一2一基)甲烷及双 fl一甲基咪唑.2一基1乙烯与第六族羰基金属化合物的反应研究 7 innel。steric repulsion.At the same time.the imidazole ring bouM to the tungsten atom is nearly perpendicular to the olefinic plane.with a dihedral angle of 85.9。.In addition,the dihedral angle between two iMdazole 【3 J Xie Y F,Wen Z K, Carl R Y,et a1.Orgalzometdlics 2008,27: 5684—5690 f4l Wen Z,Yang Z,Song H,et a1.Chin. Chem.,2009.27:993— 998 rings is 74.3。. 2.3 Electrochemical Properties of complexes 4 ̄10 The cyclic voltammetrie behavior of these complexes was investigated in theil・MeCN solutions with 0.1 tool・I fn-Bu)4NPF ̄as supporting electrolyte. and with a SCaB rate of 1 O0 mV・s一 at room temperature undel’arg0n atmosphere.The data aFe summarized in Table 3,indicating that all complexes exhibit one in'eve ̄’sible oxidative process for the metal cente ̄・.This result is significantly ditl ̄rent from those of analogous group 6 metal carbonyl derivatives containing bis (pyl’azol一1一y1)methaneI”I.in which one reversible Ol・ quasi—reversible redox pmeess was obsen ̄ed.The poor chemicaI stabilih’of the oxidativ e D rI)ducts()f complexes 4q0 lnav be responsible for the irrmrersible oxidative process. Table 3 Electrochemical data for complexes 4-10 References: 『11 Pettinari C,Pettinari R.Coord.Chen1.R 1._2005.249:663—691 【21(hero A,Fern61ldez—Baeza J.Antiifol0 A,et a1.D(dton nnn . 2004:l499—15l0 l5】Pettinari C.Main Group Metd Chern..1999,22:66l一692 I61 Sadimento A P.A dr,.Heteroo'c1.C/tern.,2002.83:1 1 7—1 87 【7】Nathalie B, rhomas R,Kingsley J C,el a1. nthesis.2001: 626—632 【8l Bums C T,Jordan R F.Orgrmornetdlics,2007.26:6737—6749 f9】Buding S,Field L D,Messede B A,et a1.Orgarwmetallics. 2007,26:4335—4343 【1 OJAbuskhuna S.MeCann M,Briody J.et a1.Ibh he&on,2004. 23:173l—l737 I l 1 JRuether F,Cavell K J Braussaud N C,et a1. Chem.Soc. Dalton nnn ..2002:46844693 l1 2]Colhnan J P,Zhong M,Boulatov R.』Chem.Re . .2000: 230—23】 【13]Elgafi S,Field l D,Messerle B A.et a1.. Organorne1.Chem一 1999,588:69—77 【14]Bye ̄P K,Canty A J.Org(mometdli ̄,s,1990,9:21O-220 l15]Canty A J,Lee C V.Org(mornetdlics.1982,1:1063—1066 [16]Tang L F,Jia w I .Wang Z H,et a1. Org(mornet.Chern.. 2002.649:l52一l6O f】7]Tang J F,Wang z H,xu Y M,et a1.Pob'hedron.1999.18: 2383—2389 【l 8]Szymafiska—Buzar T.Coo em.Rev..2006.250:976—990 I l 9]Peris E,Mata J A.Moliner V.Dahon Trcms..1999:3893.3898 【20]Kraihanzel C S,Cotton F A.1norg.CheIB..1963.2:533—540 【21]Gan X X Zhao X M,Song H B.et a1.Chinese StrUCt. Chern..2Oo6.25:663.666 [22]Tang L F,Jja w L,Wang z H,et a1. Organomet.Chern.. 2001.637—639:209—21 5 

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