共查询到19条相似文献,搜索用时 637 毫秒
1.
合成了离子对配合物(NO2Q1)2[Ni(mnt)2],并用元素分析和红外光谱进行了表征.单晶结构分析结果表明三斜晶系,空间群p-1.晶胞参数a=8.2240(16)A,6=10.777(2)A,c=12.137(2)A,α=72.58(3).,β=72.82(3)°,γ=68.78(3)°,V=935.4(3)A3,Z=1.(NO2Ql)+和[Ni(mnt)2]2-分别形成了完全分立的柱状堆积结构.在阴离子堆积柱内,Ni(Ⅱ)离子形成了一维均匀链.阳离子间,比邻的芳环间存在弱的π…π作用. 相似文献
2.
二硫烯过渡金属配合物因特殊的结构和新颖的光、电、磁学等性质,多年来倍受化学家和材料学家重视[1,2].含[M(mnt)2]- (mnt为马来二氰基二硫烯,M 为 Ni、Pd、Pt和Fe等)配阴离子化合物NH4·Ni(mnt)2·H2O,发现低温下(<4.5 K)具有铁磁有序,是对二硫烯化学的新发展[3]. 相似文献
3.
4个一维磁链化合物[R-BzPy][Pd(mnt)2](R-BzPy+=对位取代苄基吡啶阳离子;R=Cl(化合物1),Br(化合物2),I(化合物3)和NO2(化合物4))具有相似的晶体堆积结构,即,[Pd(mnt)2]-和R-BzPy+分别形成完全分列的柱状堆积。这一结构特征与其类似化合物[R-BzPy][Ni(mnt)2]相似。但是,[Pd(mnt)2]-和[Ni(mnt)2]-2个系列化合物结构之间存在明显差异:(1)室温下,[R-BzPy][Ni(mnt)2]晶体中[Ni(mnt)2]-和R-BzPy+堆积柱是均匀的;而[R-BzPy][Pd(mnt)2]晶体中[Pd(mnt)2]-和R-BzPy+堆积柱是不均匀的。(2)在两个系列化合物阴离子堆积柱内,相邻[Pd(mnt)2]-分子平面之间距离比相邻[Ni(mnt)2]-分子平面之间距离短。在[Pd(mnt)2]-堆积柱内,[Pd(mnt)2]-离子之间反铁磁交换作用非常强,导致了化合物几乎呈抗磁性。在密度泛函理论框架下,利用对称性破损方法,我们计算了[Pd(mnt)2]-离子之间磁交换常数。在svwn/lanl2dz和bpw91/lanl2dz水平上的计算结果与磁化率拟合结果一致。理论分析揭示,在[Pd(mnt)2]-堆积柱内,[Pd(mnt)2]-离子之间强反铁磁交换与其π-型前线轨道有效重叠密切相关。 相似文献
4.
采用自由配体法,将铁邻菲啰啉(Fe(phen)3)配合物封装在含有不同碱金属阳离子的Y型分子筛中,制备了系列Fe(phen)3/M-Y(M=Li+,Na+,K+和Cs+)催化剂.采用X射线衍射、红外光谱、紫外-可见光谱、热重-差热分析、电感耦合等离子原子发射光谱、N2吸附-脱附以及催化氧化反应考察了碱金属离子对Fe(phen)3/M-Y催化剂物化性质和催化氧化性能的影响.结果表明,交换有不同碱金属离子的Y型沸石中Fe(phen)3的封装量不同,而且Fe(phen)3在Y型沸石中的热稳定性随着碱金属离子半径的增加有所降低,其中Fe(phen)3/Li+-Y具有最高的配合物封装量和热稳定性能.在环己烷或苯乙烯氧化反应中,在较低的反应温度下,Fe(phen)3/K+-Y表现出最高的催化活性,而在较高的反应温度下,Fe(phen)3/Cs+-Y的催化活性最高,碱金属离子对Fe(phen)3/M-Y催化氧化性能的影响是电子效应、空间限制作用和扩散效应的综合结果. 相似文献
5.
本工作设计和合成了十个由夹心型金属有机化合物阳离子与金属二硫醇配合物[M(mnt)2]阴离子组成的金属有机盐类化合物:(M'Cp2)[M(mnt)2]或[FeCp(Tol)2][M(mnt)2]其中M=Ni, Pd, Co, Cu或Zn, M'=Fe或Co Cp代表环戊二烯基; Tol代表甲苯; mnt代表, 通过元素分析, IR和NMR对化合物进行表征, 测定了[FeCp(Tol)]2[Ni(mnt)2]的单晶结构。Mossbauer谱和AESR表明(FeCp2)[Ni(mnt)2]是个混合化合物, 提出了该化合物的生成反应机理。测定了所有化合物的固体电导率和部分化合物的固体磁学性质。 相似文献
6.
合成了2,4-二甲基-6-(4’-N,N-二甲氨基苯乙烯基)-1,3,5-均三嗪(1)和2-苯乙烯基-4,6-二甲基-1,3,5-均三嗪(2)两种化合物,并对其进行了1H NMR,MS,元素分析等表征.采用吸收光谱法研究了金属离子与化合物间的相互作用,结果显示:化合物1对Fe3+和Cu2+表现出高选择性光谱响应,其最大吸收波长由393 nm分别红移至525 nm和513 nm,溶液颜色由黄色变为粉红色.化合物1与Fe3+结合形成1∶1型配合物,其结合常数为1.8×104L mol-1;与Cu2+结合形成2∶1型配合物,其结合常数为2.6×1010L mol-1.化合物2仅对Fe3+呈现显著的光谱变化,其最大吸收波长由304nm红移至357 nm,而Cu2+的加入未引起光谱明显变化,2与Fe3+亦形成1∶1型配合物,结合常数为1.0×105L mol-1.结果表明Fe3+可能与化合物1和2中三嗪N配位,而Cu2+与化合物1中甲氨基中的N配位.同时考察了其它金属离子如Li+,K+,Mg2+,Ca2+,Co3+,Ni2+,Ag+,Cd2+,Hg2+和Zn2+等离子对化合物1和2吸收光谱的影响,结果显示两者光谱均无明显变化,据此提出了高选择性Fe3+,Cu2+的识别体系. 相似文献
7.
本工作设计和合成了十个由夹心型金属有机化合物阳离子与金属二硫醇配合物[M(mnt)2]阴离子组成的金属有机盐类化合物:(M'Cp2)[M(mnt)2]或[FeCp(Tol)2][M(mnt)2]其中M=Ni, Pd, Co, Cu或Zn, M'=Fe或Co Cp代表环戊二烯基; Tol代表甲苯; mnt代表, 通过元素分析, IR和NMR对化合物进行表征, 测定了[FeCp(Tol)]2[Ni(mnt)2]的单晶结构。Mossbauer谱和AESR表明(FeCp2)[Ni(mnt)2]是个混合化合物, 提出了该化合物的生成反应机理。测定了所有化合物的固体电导率和部分化合物的固体磁学性质。 相似文献
8.
合成并表征了两种新的离子对化合物(BMIB)[(Ni(mnt)2]2(1)和(BMIO)[(Ni(mnt)2)]2(2)(其中mnt2-=马来二氰基二硫烯,BMIB=1,4-bis(1-methylimidazolium)butane,BMIO=1,8-bis(1-methylimidazolium)octane)。在化合物1中,[Ni(mnt)2]-阴离子排列形成阴离子三聚体以及与阳离子交替排列形成阴、阳离子混合柱。化合物2的堆积结构与化合物1不同,阴、阳离子堆积成非等间距的阴、阳离子柱。化合物1和2分别在861和857 nm近红外波段处出现较强的近红外吸收。电化学性质研究结果表明,2个化合物均出现了两对不可逆的电化学氧化/还原过程,且平衡阳离子的烷基链长显著影响化合物的氧化、还原电极电势。变温磁化率测量表明,在2~400 K温度范围内,化合物1表现出弱的顺磁性质,变温摩尔磁化率遵循简单的Curie-Weiss定律。化合物2表现出低维反铁磁交换自旋体系磁化率特征。 相似文献
9.
Ln2O3、硝酸铁、邻菲罗啉和钛铁试剂(tiron)通过水热法自组装合成了2个异质同晶的3d-4f杂核配合物[Fe(phen)3]2[FeLn(H2O)(tiron)3]·6H2O,其中,Ln=HoⅢ(1)和YbⅢ(2)。X-射线单晶衍射分析表明,晶体属立方晶系,P213空间群。3个tiron4-配体利用酚氧桥联Ln3+和Fe3+形成具有C3对称性的[FeLn(H2O)(tiron)3]6-异双核配位单元,其中七配位的Ln3+呈现一种畸变的单帽反三棱柱配位构型。配阳离子[Fe(phen)3]3+通过phen-phen之间的π-π相互作用和与配阴离子间的静电引力等作用组装成三维的超分子。在2~300 K温度范围内测试了配合物的变温磁化率,结果表明,Ln(Ⅲ)-Fe(Ⅲ)之间存在反铁磁性相互作用。 相似文献
10.
采用回流法在水溶剂中合成了2个含氮配体单核镍配合物[Ni(phen)2(H2O)2](1,6-nds)·2H2O(1)和[Ni(phen)3](1,6-nds)·10H2O(2)(1,6-nds=1,6-萘二磺酸根离子,phen=1,10-邻菲罗啉)。配合物1中,镍离子与2个1,10-邻菲罗啉和2个水分子配位,形成[Ni(phen)2(H2O)2]2+阳离子。2个没有配位的水分子通过氢键与[Ni(phen)2(H2O)2]2+和1,6-萘二磺酸根离子相互连接形成二维层状结构。配合物2中,镍离子与3个1,10-邻菲罗啉配位,形成[Ni(phen)3]2+阳离子。大量的氢键将自由的水分子和1,6-萘二磺酸根离子连接形成三维网状结构。2个配合物中1,6-萘二磺酸根离子均没有与镍离子配位,只是起到平衡电荷的作用。室温下,配合物显示了较大的荧光发射峰,其最大发射峰分别在443和438 nm。 相似文献
11.
合成并表征了两种新的离子对化合物(BMIB)[(Ni(mnt) 2] 2 (1)和(BMIO)[(Ni(mnt) 2)] 2 (2)(其中mnt 2-=马来二氰基二硫烯, BMIB=1, 4-bis(1-methylimidazolium)butane, BMIO=1, 8-bis(1-methylimidazolium)octane)。在化合物1中, [Ni(mnt) 2] -阴离子排列形成阴离子三聚体以及与阳离子交替排列形成阴、阳离子混合柱。化合物2的堆积结构与化合物1不同, 阴、阳离子堆积成非等间距的阴、阳离子柱。化合物1和2分别在861和857 nm近红外波段处出现较强的近红外吸收。电化学性质研究结果表明, 2个化合物均出现了两对不可逆的电化学氧化/还原过程, 且平衡阳离子的烷基链长显著影响化合物的氧化、还原电极电势。变温磁化率测量表明, 在2~400 K温度范围内, 化合物1表现出弱的顺磁性质, 变温摩尔磁化率遵循简单的Curie-Weiss定律。化合物2表现出低维反铁磁交换自旋体系磁化率特征。 相似文献
12.
将过渡金属配合物阳离子([M(DETA) 2] n+(M=Cu 2+,Ni 2+,Co 3+;DETA=Diethylenetriamine,二乙烯三胺)作为客体插入层状MnPS 3层间得到了相应的3个夹层化合物。通过X-射线粉末衍射、元素分析和红外光谱对夹层化合物的结构进行了表征。结果表明,与主体MnPS 3 0.65 nm的层间距相比较,夹层化合物(Mn 0.88PS 3[Cu(DETA) 2] 0.12)的层间距扩大了0.32 nm,由此推测客体[Cu(DETA) 2] 2+在层间以平面四方的配位形式存在,而另2个夹层化合物(Mn 0.79PS 3[Ni(DETA) 2] 0.21和Mn 0.74PS 3[Co(DETA) 2] 0.17)的层间距扩大了0.48 nm,说明客体[(M(DETA) 2] n+,M=Co 3+,Ni 2+) 在主体层间以八面体配位形式存在。磁性测试结果表明过渡金属离子[(M(DETA) 2] n+(M=Cu 2+,Co 3+)的插入能引起主体MnPS 3的磁性在35~40 K发生由顺磁向亚铁磁性的转变并表现自发磁化,而客体[Ni(DETA) 2] 2+却使夹层化合物的反铁磁相互作用增强,抑制了自发磁化的发生。 相似文献
13.
Copper (II) complexes [Cu(dmit)(phen)] 2 ( 1) and [Cu(mnt)(phen)] n ( 2) (mnt 2??=?maleonitriledithiolate, dmit 2??=?1,3-dithiole-2-thione-4,5-dithiolate, phen?=?1,10-phenanthroline) have been prepared by ligand-exchange between phen and [N(Bu) 4] 2[Cu(dmit) 2] or [N(Bu) 4] 2[Cu(mnt) 2]. Both complexes have been characterized by spectroscopic, electrochemical, and single-crystal X-ray analysis. In complex 1, dimers are extended into a two-dimensional array by weak S5–Cu contacts. In complex 2, monomers are extended into chains in a head-to-tail arrangement by weak Cu–S coordination bonds and π –π stacking interactions. 相似文献
14.
Seven new transition metal complexes formulated as [M 2(1,4-tpbd)(diimine) 2(H 2O) 2] 4+ [M = Zn, Co, Ni, Cd; 1,4-tpbd = N, N, N′, N′-tetrakis(2-pyridylmethyl)benzene-1,4-diamine; diimine is a N,N-donor heterocyclic base like 1,10-phenanthroline (phen), 2,2′-bipyridine (bpy), 4,5-diazafluoren-9-one (dafo)] have been synthesized and structurally characterized by X-ray crystallography: [Zn 2(1,4-tpbd)(phen) 2(H 2O) 2] 4+ ( 1), [Zn 2(1,4-tpbd)(bpy) 2(H 2O) 2] 4+ ( 2), [Co 2(1,4-tpbd)(phen) 2(H 2O) 2] 4+ ( 3), [Ni 2(1,4-tpbd)(phen) 2(H 2O) 2] 4+ ( 4), [Ni 2(1,4-tpbd)(bpy) 2(H 2O) 2] 4+ ( 5), [Ni 2(1,4-tpbd)(dafo) 2(H 2O) 2] 4+ ( 6) and [Cd 2(1,4-tpbd)(phen) 2(H 2O) 2] 4+ ( 7). Single crystal diffraction reveals that the metals in the complexes are all in a distorted octahedral geometry. The interactions of the seven complexes with calf thymus DNA (CT-DNA) have been investigated by UV absorption, fluorescence, circular dichroism spectroscopy and viscosity measurements. The apparent binding constants ( Kapp) are calculated to be 5.2?×?10 5 M ?1 for 1, 1.05?×?10 5 M ?1 for 2, 5.76?×?10 5 M ?1 for 3, 4.57?×?10 5 M ?1 for 4, 1.29?×?10 5 M ?1 for 5, 1.7?×?10 5 M ?1 for 6, 2.53?×?10 5 M ?1 for 7, the binding propensity to the calf thymus DNA in the order: 3 (Co-phen) > 1 (Zn-phen) > 4 (Ni-phen) > 7 (Cd-phen) > 6 (Ni-dafo) > 5 (Ni-bpy) > 2 (Zn-bpy). Furthermore, these complexes display efficient oxidative cleavage of supercoiled DNA; the Zn(II)/H 2O 2 and Cd(II)/H 2O 2 systems efficiently cleave DNA attributed to the peroxide ion coordinated to the Zn(II) and Cd(II), which enhanced their nucleophilicity, this is rare. 相似文献
15.
A new Cr(III) bis-acetylide complex containing redox-active ethynyl-substituted 4-methyl-4′,5′-trans-diethyl-ethylenedithio-tetrathiafulvalene, [Cr(III)cyclam(C≡C-MeEt2EDT-TTF)2]n+ ([1]n+) was synthesized. The crystal structures of two salts, [1][Ni(dmit)2] (dmit?=?2-thioxo-1,3-dithiole-4,5-dithiolate) and [1][Ni(mnt)2]3 (mnt?=?maleonitriledithiolate), were determined by single-crystal X-ray diffraction. In the crystal of [1][Ni(dmit)2], the trans-diethyl group of [1]+ is in the axial position and prevents π-stacking of the TTF units, resulting in a negligibly weak spin–spin interaction between Cr3+ and [Ni(dmit)2]?. In contrast, in [1][Ni(mnt)2]3, the trans-diethyl group is in the equatorial position in [1][Ni(mnt)2]3 owing to the strong attractive force between the π-stacked TTF+ units and the [Ni(mnt)2]? anions. This π-stacking has a significant effect on the magnetic property of [1] [Ni(mnt)2]3. The π-stacked TTF+ units and [Ni(mnt)2]? anions behave approximately as a one-dimensional S?=?1/2 antiferromagnetic chain connecting the spins of Cr3+ antiferromagnetically. 相似文献
16.
Some salt-like complexes of the cluster anion [Ni III (η 5-1,2-B 9C 2H 11 ) 2] − ([NiCb 2] −), containing paramagnetic Ni 3+ ion, with cations Cs +, (CH 3) 4N +, [MnPhen 3] 2+ (where Phen is 1,10-phenanthroline) are studied by EPR method at 77 K and 300 K. A neutral complex [MnPhen 2(NCS 2] is also studied for comparison. The synthesis procedure and X-ray diffraction analysis of [MnPhen 3][NiCb 2] 2 complex with paramagnetic ions Mn 2+ (3 d
5) and Ni 3+ (3 d
7) are described. The EPR data of isostructural complexes [MnPhen 3][NiCb 2] 2 and [MnPhen 3][CoCb 2] 2 are reported. No exchange or dipole-dipole interaction was observed between two paramagnetic ions (Mn 2+ and Ni 3+) simultaneously present in a complex structure. The temperature changes in EPR spectra of solid compounds are caused by rearrangements in the Mn 2+ surrounding. In the case of a salt with a compact spherical Cs + ion, the local perturbation in a second coordination sphere of [NiCb 2] − anion leads to redistribution of the electron density and changes in g-factor.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 6, 2005, pp. 403–414.Original Russian Text Copyright © 2005 by Nadolinny, Polyanskaya, Volkov, Drozdova. 相似文献
17.
A new ion-pair complex, [TTF][Pd(mnt) 2] ( 1), where TTF + =?tetrathiafulvalene and mnt 2??=?maleonitriledithiolate, was synthesized and characterized structurally. Compound 1 crystallizes in triclinic space group P-1, with a?=?8.008(5)?Å, b?=?11.333(8)?Å, c?=?11.373(6)?Å, α?=?108.112(7)°, β?=?91.550(5)°, γ?=?95.232(5)°, and V?=?975.2(11)?Å 3. The [TTF] + cations (C) and [Pd(mnt) 2] ? anions (A) form mixed stacks in …AACCAACC… fashion, and the neighboring mixed stacks are held together via van der Waals forces in the crystal. Compound 1 shows weak Curie/Weiss-type magnetic behavior from 2 to 370?K; theoretical investigation disclosed the existence of strongly antiferromagnetic coupling in both [Pd(mnt) 2] 2 2? and [TTF] 2 2+ dimer pairs via frontier orbitals overlap mechanism and weakly ferromagnetic coupling between the face-to-face overlapped [TTF] + and [Pd(mnt) 2] ? via spin polarization mechanism within a mixed stack. The powdered pellet electrical conductivity measurement indicated that 1 shows semiconductor character with activation energy of 1.1(3)?eV. 相似文献
18.
基于尖晶石晶体结构信息,本文采用热力学三亚晶格模型,将材料热力学计算和第一性原理计算相结合,研究了Zn xMn 1-x Fe 2O 4和Ni xMn 1-xFe 2O 4立方相中的Zn 2+、Ni 2+、Mn 2+以及Fe 3+在8a和16 d亚晶格上的占位有序化行为。结果表明:在锰铁氧体中,室温下Mn 2+完全占据在8a亚晶格上,Fe 3+完全占据在16 d亚晶格上,属于正尖晶石结构;随着热处理温度升高,在1 273 K达到热处理平衡时的占位构型为(Fe 0.093+Mn 0.912+)[Fe 1.913+Mn 0.092+]O 4,在热处理温度升至1 473 K时,达到热处理平衡时的占位构型为(Fe 0.113+ Mn 0.892+)[Fe 1.893+Mn 0.112+]O 4,均与实验结果符合较好。在锌铁氧体中,室温下Zn 2+完全占据在8a亚晶格上,Fe 3+完全占据在16 d亚晶格上,属于正尖晶石结构;在热处理温度较高时,Zn 2+和Fe 3+发生部分置换,符合实验结果。在镍铁氧体中,半数的Fe 3+在室温下占据在8a亚晶格上,Ni 2+与剩下另一半的Fe 3+共同占据在16 d亚晶格上,仅在热处理温度较高的时候发生微弱变化,亦与已有的实验结果吻合。在此基础上,本文进一步通过热力学预测建立了立方相尖晶石结构的Zn xMn 1-xFe 2O 4、Ni xMn 1-xFe 2O 4复合体系中阳离子占位行为与热处理温度对占位的影响。 相似文献
19.
New hexamethylated ferrocene derivatives containing thioether moieties (1,1′-bis[( tert-butyl)thio]-2,2′,3,3′,4,4′-hexamethylferrocene ( 3a , b )) or fused S-heteropolycyclic substituents ( rac-1-[(1,3-benzodithiol- 2-yliden)methyl]-2,2′,3,3′,4,4′-hexamethylferrocene ( 5 ) and rac-1-[1,2-bis(1,3-benzodithiol-2-yliden)ethyl]-2,2′,3,3′,4,4′-hexamethylferrocene ( 14 )), as well as a series of ferrocene-substituted vinylogous tetrathiafulvalenes (1,1′-bis[1,2-bis(1,3-benzodithiol-2-yliden)ethyl]ferrocene ( 6a ), 1,1′-bis[1-(1,3-benzodithiol-2-yliden)-2-(5,6-dihydro-1,3-dithiolo[4,5- b] [1,4]dithiin-2-yliden)ethyl]ferrocene ( 6b ), [1,2-bis(1,3-benzodithiol-2-yliden)ethyl]ferrocene ( 21a ), [1-(1,3-benzodithiol-2-yliden)-2-(5,6-dihydro-1,3-dithiolo[4,5- b] [1,4]dithiin-2-yliden)ethyl]ferrocene ( 21b ), [1,2-bis(5,6-dihydro-1,3-dithiolo[4,5- b] [1,4]dithiin-2-yliden)ethyl]ferrocene ( 21c ), [1-(5,6-dihydro-1,3-dithiolo[4,5- b] [1,4]dithiin-2-yliden)-2-(1,3-benzodithiol-2-yliden)ethyl]ferrocene ( 21d )) were prepared and fully characterized. Their redox properties show that some of them are easily oxidized and undergo transformation to paramagnetic salts containing bis(maleonitriledithiolato)-metallate(III) anions [M(mnt) 2] − (M=Ni, Pt; bis[2,3-dimercapto- κS)but-2-enedinitrilato(2 −)]nickelate (1 −) or -platinate (1 −). The derivatives [ 3a ] [Ni(mnt) 2] ( 26 ), [ 3a ] [Pt(mnt) 2] ( 27 ), [Fe{( η5-C 5Me 4S) 2S}] [Ni(Mnt) 2] ( 28 ), [Fe{( η5-C 5Me 4S) 2S}] [Pt(mnt) 2] ( 29 ), [ 5 ] [Ni(mnt) 2]⋅ClCH 2CH 2Cl ( 30 ), [ 6a ] [Ni(mnt) 2] ( 31 ), [ 6a ] [Ni(mnt) 2]⋅ClCH 2CH 2Cl ( 31a ), [ 6a ] [Pt(mnt) 2] [ 32 ), and [ 6b ] [Ni(mnt) 2] ( 33 ) were prepared and fully characterized, including by SQUID (superconducting quantum interference device) susceptibility measurements. X-Ray crystal-structural studies of the neutral ferrocene derivatives 6a , b , 21c , d , and 1,1′-bis[1-(1,3-benzodithiol-2-yliden)-2-oxoethyl]ferrocene ( 23 ), as well as of the charge-transfer salts 26 – 28 , 30 , and 31a , are reported. The salts 28 and 30 display both a D +A −A −D + structural motif, however, with a different relative arrangement of the [{Ni(mnt) 2} 2] 2− dimers, thus giving rise to different but strong antiferromagnetic couplings. Salt 26 exhibits isolated ferromagnetically coupled [{Ni(mnt) 2} 2] 2− dimers. Salt 27 displays a D +A −D +A − structural motif in all three space dimensions, and a week ferromagnetic ordering at low temperature. Salt 31a , on the contrary, shows segregated stacks of cations and anions. The cations are connected with each other in two dimensions, and the anions are separated by a 1,2-dichloroethane molecule. 相似文献
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