首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 234 毫秒
1.
稀土硝酸盐与双啮杂环胺配体α,α′联吡啶(bipy)的配合物研究不多.Hart 等合成了Ln(NO_3)_3(bipy)_2配合物;亦已解析了3个晶体结构:La(NO_3)_3(bipy)_2,Tb(NO_3)_3(bipy)_2,La(NO_3)3·bipy·2H_2O·(B-15-C-5)(B-15-C-5=苯并15-冠-5,).我们对La(NO_3)_3(bipy)_2的电子结构和化学键作过研究.本文利用自旋非限制适于稀土配合物计算的INDO方法研究了La(NO_3)_3·bipy·  相似文献   

2.
本文报道了La(NO3)3(bipy)(2H2O)(B-15-C-5),(Mr=785.46)的合成和晶体结构。晶体属单斜晶系,空间群为P21/n,晶胞参数:a=11.951(6),b=18.181(7),c=14.754(5)A,B=96.19(3),V=3187,0A3,Z=4,Dc=1.637g/cm3,晶体结构由直接法和Fourier合成解出,使用对角块矩阵和全矩阵最小二乘法对原子参数进行修正,最后偏离因子R=0.035(5261个1>3σ(I)射衍,单晶结构分析表明,在该配合物中,直接参与位的是联吡啶上的两上氮原子,三个NO3中的六个氧原子以及两个水分子中的氧原子,La^3 的配位数为10,B-15-C-5是通过氢键与2O分子 相连的。  相似文献   

3.
本文报道的化合物为黑色准八面体状晶体,属斜方晶系,空间群为Pna2_1,晶胞参数为:a=17.815(1),b=16.629(2),c=12.003(1)A,z=4,ρ_(obs)=1.80g·cm~(-3),ρ_(calc)=1.804g·cm~(-3),晶体结构用重原子法解出,经全矩阵最小二乘方精修,对2584个 I≥3σ(I)的独立衍射的最终偏离因子R为 0.048.结果表明,晶体结构由四乙基胺阳离子和三核钼簇阴离子所组成.簇阴离子是单(μ_3—0)帽三核簇,Mo—Mo间距平均为2.60(2)A.在与μ_3—O原子相对的Mo_3。三角形面的另一方,每两个Mo原子之间各由一个C1原子桥联.这七个原子形成一种缺顶点的畸变类立方烷构型.另外,每个Mo原子还由其他三个原子补充配位成接近八面体构型.这些配位原子是两个乙酰基的氧原子和5个氯原子.乙酰基的两个氧原子分别与相邻两个Mo原子配位.簇阴离子接近于C_m对称性。  相似文献   

4.
本文报告用单晶X-射线衍射法测定[Nd_2O(C-5H_5)_6](C_(12)H_9N_2)_3C1·mC_4H_5O的晶体结构。晶体属于单斜晶系,空间群为P2-1/c,晶胞参数为a=20.982(15),b=11.217(7),c=32.954(32),β=104.17(7)°;Z=4。Nd和C1原子坐标用直接法定出,其他原子坐标以差Fourier方法求得,经过最小二乘法修正,R因子为0.159。在分子中三个茂环皆通过η~5。键与Nd原子配位,两个Nd原子间存在桥氧原子,因而形成(Nd_2O(C_5H_5)_6)~(2-)阴离子,Nd-C键基本上属于离子键。三个邻菲罗啉基团通过氢键与C1原子连接形成大的阳离子[(C_(12)H_9N_2)3-C1]~(2+)。  相似文献   

5.
(C_5H_7S_2)_3[Mo_3(μ_3-S)(μ_2-S_2)_3Cl_7]晶体的空间群为Pnam;晶胞参数:a=17.226(4),b=14.306(7),c=15.074(4);z=4,ρ_(obs)=2.03克/厘米~(-3),ρ_(calc)=2.063克/厘米~(-3)。晶体结构由重原子法解出,并经全矩阵最小二乘方精修,偏离因子R值为0.068。研究结果显示出,晶体结构由三核钼簇阴离子[Mo_3(μ_3-S)×(μ_2-S_2 )_3Cl_7]~(3-)以及环绕着它的平面状的阳离子(C_5H_7S_2)~ 所组成。簇阴离子中,三个处在等边三角形顶点的Mo原子,由一个μ_3—S原子将其联系在一起,同时,每两个Mo原子之间还由一个S_2基团桥联,Mo—Mo间距分别为2.755(1),2.755(1),2.743(1)。此外,每个Mo原子还由两个Cl原子配位,使得Mo原子近邻的所有配位原子一起,形成接近五角双锥构型。簇阴离子中还有一个不与Mo原子直接配位的Cl原子,处在三个μ_2—S_2基团之间,而且与这三个S_2的一端S原子有一定程度的成键。簇阴离子整体接近c_(3v)对称性。用Cottonm~([1])等简化量化方法定性地分析了{Mo_3}体系的M—M成键情况,满意地解释了Mo—Mo间距和分子的磁性。  相似文献   

6.
具有松散配位的三核钼簇合物[Mo_3(μ_3—S)(μ—S)_3(μ—dtp)(dtp)_3·(H_2O)](A)(dtp=S_2P(OC_2H_5)_2)和过量的咪唑反应时,(H_2O)配体和双啮桥基配体(dtp)可以同时被置换而形成标题化合物(Ⅰ)。晶体结构属三斜晶系,空间群P1。结构组成包括簇阳离子[Mo_3(μ_3—S)(μ—S)_3(dtp)_3·(C_3H_4N_2)_3],(dtp)阴离子及丙酮溶剂。簇阳离子具有近似C_3对称性,三个Mo原子基本上形成等边三角形,其Mo—Mo键长分别为2.763(1),2.762(1),和2.756(1),此簇合物是配体取代反应系列研究的产物之一,是由已知原子簇反应获得新型簇合物的一个例证。  相似文献   

7.
含氮宾的两个三核羰基铁簇合物是由[Et_3NH][HFe_3(CO)_(11)]与C_6H_5NCO在苯中反应获得。应用四园衍射仪测定了H_2Fe_3(N-C_6H_5)(CO)_9(Ⅰ)和Fe_3(N-C_6H_5)(μ_3-CO)(CO)_9(Ⅱ)的晶体结构。晶体数据为:C_(15)H_7NO_9Fe_3(Ⅰ),空间群P2_1/a,a=18.343(2),b=9.072(1),c=11.451(1)(?),β=102.03(1)°,V=1863.7(?)~3,Z=4,D_c=2.143g/cm~3;C_(16)H_5NO_(10)Fe_3(Ⅱ),空间群P2_1/c,a=8.634(1),b=13.026(1),c=17.642(2)(?),β=97.68(1)°,V=1966.3(?)~3,Z=4,D_c=1.820g/cm结构系用直接法解出,最后R_(Ⅰ)因子为0.033,R_(Ⅱ)因子为0.027。测定结果表明,(Ⅰ)和(Ⅱ)分子均具有C_s对称性,且三个Fe原子共面,呈近似等边三角形结构。(Ⅰ)中面桥N原子以不对称方式与三个Fe原子成键;(Ⅱ)中面桥羰基以不对称方式与三个Fe原子键连。Fe-N和Fe-C键长分别在1.896-1.938(?)和2.006-2.110(?)之间。  相似文献   

8.
本文合成了系列配合物Ln(n-C_5H_(11)COO)_3·2H_2O(Ln=Y,Sm,Eu,Gd,Tb,Er和Yb),并对[Y(n-C_5H_(11)COO)_3·2H_2O]_2的晶体结构进行了研究。结果表明该晶体属于单斜晶系,P2_1/α空间群。晶胞参数如下:a=8.925(6),b=14.033(5),c=19.988(6)(?);β=95.90(3)°;V=2490.3(?)~3,Z=2.2978个独立可观察点(Ⅰ>3σ(Ⅰ))参加了结构修正,最终R因子为0.085。分子中1两个Y原子通过两个μ_2-C_5H_(11)COO桥基连结成双核配合物;每个Y还与两个双齿螯合的羧基和两个水分子成键。因此Y原子的配位数为9。对系列化合物的红外光谱也进行了研究。  相似文献   

9.
本工作合成了MgCl_2(CH_3COOC_2H_5)_2,并对其晶体结构进行了测定,收集到三维独立的衍射点1672个。晶体属正交晶系,空间群为P2_12_12。晶胞参数α=7.353(3),b=25.111(10),c-8.631(2)。Z=8用Patterson法解出结构,用块矩阵最小二乘程序修正。最后的R值为0.0795。结构的特征是,镁原子为八面体配位,氯原子与镁原子以双桥键相连,使镁原子形成多聚链,乙酸乙酯在多聚链双侧与Mg相配位。  相似文献   

10.
本文报道了在乙醇—氯仿混合溶剂中首次获得组份为(NaInBr_4)_2(C_(14)H_(20)O_5)_3·2H_2O的晶体配合物.用元素分析确定了其组份.通过红外光谱的研究证实配合物晶体中的阳离子与醚氧原子及水分子发生了配合作用。 用X-射线衍射法测定了配合物的晶体结构,晶体属单斜晶系,M=1755.3,a=14.393(8)A,b=28.494(9)A,c=15.191(8)A,β=96.63(5)°,V=6189A~3’,D_c=1.88g·cm~(-3),Z=4,空间群为C_(2h)~5——P2_1/n。晶体结构研究表明不对称单位中包含两个配阳离子Na~(+)(B15C5)(B15C5)代表C_(14)H_(20)O_5分子)。两个配阴离子InBr_4~-、两个H_2O分子和一个未被金属离子配合的B15C5分子。配合物的晶体结构测定结果对于阐明与该晶体相对应的萃取体系In(Ⅲ)/NaBr/B15C5—1,2C_2H_4Cl_2的萃取机理提供了理论依据。  相似文献   

11.
杨瑞娜  谌了容 《结构化学》1995,14(3):229-232
报导了双(二苯基膦)丁烷的双核银配合物-[Ag(Ph_2PCH_2CH_2CH_2CH_2PPh_2)-(NO_3)]_2的合成及晶体结构分析。晶体属于单斜晶系,空间群为P2_1/n,晶胞参数为:a=12.821(3),b=11.244(9),c=19.386(9),β=105.94(3)°,V=2687.2~3,Z=2,D_c=1.474g/cm~3,M_r=1192.7,F(000)=1216,μ=8.873cm~(-1)。晶体结构由直接法和Fourier合成解出,使用对角块矩阵和全矩阵最小二乘法对原子参数进行修正,最后偏离因子R=0.056,R_w=0.068,其中2634个I>3σ(Ⅰ)的可观察点参加了结构修正,单晶结构分析结果表明,在该配合物中,配体双(二苯基膦)丁烷(dppb)中的磷原子直接与银离子配位,硝酸根也以双齿配位形式存在,中心银离子的配位采用畸变的四面体构型,整个分子是一个二聚物。  相似文献   

12.
CrystalStructureof[La(NO_3)_3(12-crown-4)-(H_2O)](12-crown-4)MaoJiang-Gao;JinZhong-Sheng;YuFeng-Lan(LaboratoryofRareEarthChemi?..  相似文献   

13.
<正> The molecular and crystal structure of the complex (μ-HOCH2CH2-S)2 Fe2(CO)4(PPh3)2 synthesized by reaction of ethylene epoxide with (μ-Lis)2Fe2(CO)6, followed by EtOH alcoholysis and PPh3 substitution,was determined by X-ray diffraction technique. The crystals are triclinic,space group P 1,with a= 10. 902(2),b=12. 106 (2),c=16. 123(4) A ,V= 2079. 36A3,α=78. 13(1),β=89. 37(2),γ=87. 93(1)°, Z = 2,Dx=1. 44 g/cm3.μ(MoKa) = 9. 149cm-1, F(000) = 940. The final R and Rw equal to 0. 055 and 0. 068,respectively,for 3598 observed independent reflections. In this molecule two PPh3 ligands are trans to the Fe - Fe bond and axially coordinated to two iron atoms. In addition,two hydroxylethyl groups are attached to bridging sulfur atoms by e-type of bond and thus this molecule is an ee conformer.  相似文献   

14.
<正> The crystal and molecular structure of the title compound was determined by single crystal X-ray diffraction method. The complex crystallizes in the mono-clinic space group P21/n with a = 10. 306 ( 3) , b = 10. 161 (2), c = 14. 798 ( 4) A . β= 108. 52(2)°, V= 1469. 4(6)A3,Z= 4. The structure was solved by direct methods. Least-squares refinement converged to a final value of R = 0. 043 and Rw= 0. 040 for 1237 reflections. The molybdenum (Ⅵ) ion is bonded to two chlorine atoms, two oxo atoms and two oxygen atoms from two monodentately and weakly coordinated carboxyl groups of molecules C4H3OCOOH, forming a octahedron. The Mo-O distances are in the range 1. 66 - 2. 39A ,the Mo-Cl distances fall in the range 2. 33-2. 34A.  相似文献   

15.
1 INTRODUCTION In the last decade, cyano-bridged Prussian Blueanalogues[1] have been intensively studied from theviewpoint of application as functionalized molecule-based magnets[2], chemical sensor materials[3], fluo-rescent materials[4] and zeolitic-type materials[5, , 6]etc. In 1976, a series of cyano-bridged three-dimen-sional rare earth hexacyanometalates(IIILnM(CN)6?nH2O (M = Fe or Cr, n = 4 or 5) were crystallized andsubjected to single-crystal X-ray analysis[7]. …  相似文献   

16.
1INTRODUCTIONIntherecentyears,organolanthanideamideshaveattractedagreatdealofat-tention.Forexample,theyareabletoreactwithCOtogiveinsertionproduct[(C,Me,)2SinjZt(PhN)OCCO(NPh)jti},withaminoolefinstoyieldcorrespondingheterocyclestZ),withmethylmethacrylate(MMA)toleadtoMMApolymeriza-tiont3'43.Inordertoexplorefurthertheirchemistry,wesynthesizedsomeanionicandneutrallanthanoceneamidestoinvestigatetheirchemicalreactivities(5--7).Inthispaper,wewouldliketodescribethepreparationofanotheranio…  相似文献   

17.
朱永宝  王金枝 《结构化学》1993,12(4):289-292
<正> The crystal structure of the title silver complex has been determined by the single crystal X-ray diffraction method.The white plate crystal is tri-clinic.space group P1 with a=12.289(1),b=13.330(2),c=14.846(1)A.α=59.78(1),β=70.33(1),γ=64.01(1)°,V=1867.9A3,Z=2,Dc=1.404 g/ cm3,Mr=789.6,F(000)=808,MoKa radiation,μ(MoKa)=7.891 cm-1,final R=0.049 and Rw=0.051 for 5753 observed reflections.The silver(I)is surrounded by two P and two S atoms in a distorted tetrahedral coordination.  相似文献   

18.
<正> The title complex was prepared from the reaction of NdClLi0.3 and C8H8, its crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P21/c with cell dimensions o = 11. 819(3), 6=12.651(3), c=13. 478(3)A, β=122.99(2)°, Mr = 856. 00, Z = 2, Dc=1. 68g/cm3, F(000) = 636. 89, V = 1690. 33A3. The structure was solved by direct methods and Fourier techniques. Least squares refinement on the basis of 1842 observed reflections led to final R = 0. 038 and Rw = 0. 040. The molecule is a dimer of C3H8NdCl(THF)2 bridged by two Cl atoms with Nd -Cl bond lengths of 2. 832(2) A and 2. 917(3)A.  相似文献   

19.
卢绍芳  陈红兵 《结构化学》1995,14(4):261-263
CrystalStructureofCo(S_2CPh)_3LuShao-Fang;ChenHong-Bin;HuangXiao-Ying(FujianInstituteofResearchontheStructureofMatter,Academia...  相似文献   

20.
A novel Mn(Ⅱ) complex Mn2(phen)2(p-MBA)4(H2O) has been hydrothermally synthesized by the reaction of p-methyl benzoic acid (p-MBA) with 1,10-phenanthroline (phen). Crystal data for this complex: monoclinic, space group C2/c, a= 2.3328(3), b =1.5549(2), c = 1.5557(2) nm, β = 121.726(2)°, V= 4.7997(11) nm^3, Mr = 1028.85, Dc = 1.424 g/cm^3, Z = 4, F(000) = 2128, μ(MoKa) = 0.590mm^-1, GOOF = 1.060, R = 0.0333 and wR = 0.0767. In the crystal, each Mn(Ⅱ) ion is coordinated by two nitrogen atoms from one o-phenanthroline molecule, three oxygen atoms from three p-methyl benzoic acids and one oxygen atom from one water molecule, giving a six-coordinate distorted octahedral coordination geometry. Two neighboring Mn(Ⅱ) ions are bridged by two p-methyl benzoic acid groups and one water molecule, and their end positions are respectively coordinated by one 1,10-phenanthroline and one p-methyl benzoic acid molecule, giving a binuclear cage structure, of which the Mn(Ⅱ)…Mn(Ⅱ) distance is 0.3502 nm.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号