[Co(2,3-tri)(amp)Cl][ZnCl4]体系中部分几何经式异构体的结构测定

利用单晶X-射线衍射分析了[Co(2,3-tri)(amp)Cl][ZnCl4](2,3-tri=N-(2-Aminoethvl)-1,3-propanediamine;amp=2-(Aminomethyl)pyridine)体系中的一异构体(m3-[Co(2,3-tri)(amp)Cl][ZnCl4]@2.5H2O)结构,用二维核磁共振DQCOSY和NOESY技术联合解析了另两个异构体(m2-[Co(2,3-tri)(amp)C1][ZnCl4]及m4-[Co(2,3-tri)(amp)Cl]][ZnCl4])在溶液中的结构.结构解析显示它们为该体系的三个几何经式异构体.解析的晶体结构属中心对称的空间群,表明它是外消旋的对映体.     

[Co(2,3-tri)(men)Cl][ZnCl4] 体系中三个经式异构体的晶体结构

在[Co(2,3-tri)(men)Cl][ZnCl₄](2,3-tri = N-(2-氨乙基)-1,3-丙二胺;men=N-甲基乙二胺)体系中可能的几何异构体的数目多达二十个,其中经式异构体八个,面式异构体十二个。用单晶 X-射线衍射分析方法解析了三个获得单晶的经式异构体,它们的晶体学参数:(1)m3-[ZnCl₄](monoclinic P2₁/c,a=8.0874(18),b=1     

[Co(3,3-tri)(amp)Cl][ZnCl4]一对邻位差向异构体的晶体结构

The crystal structures of a pair isomers of [Co(3,3-tri)(amp)Cl][ZnCl₄] (here 3,3-tri = N-(3-Aminoprop- yl)-1,3-propanediamine; amp=2-(Aminomethyl)pyridine) have been determined by single crystal X-ray diffrac-tion. They are the epimers with the only difference of the orientation of the Sec-NH proton in 3,3-tri ligand. The crystals with the anti-epimer (m1[ZnCl₄]·CH₃OH·H₂O) are monoclinic, space group C2/c with eight molecules in a unit cell of dimensions a=30.401(5)?,b=8.0469(13)?,c=18.817(3)?,β=93.346(3)°,V=4595.3(12)?³,D_c=1.708g·cm^-3,Z=8,F₀₀₀=2416,R=0.0462,R_w=0.1304. The crystals of the syn-epimer (m2[ZnCl₄]·H₂O) are triclinic, space group P1 with two molecules in a unit cell of dimensions a=8.9752(12)?,b=9.8855(12)?,c=12.6886(16)?,α=89.228(3)°,β=76.447(2)°,γ=80.428(3)°,V=1078.8(2)nm³,D_c=1.721g·cm^-3,Z=2,F₀₀₀=568,R=0.0313,R_w=0.0929. The crystal parameters, such as bond lengths and angles, are well consistent with the data of an ab initio computational result (RHF/LANL2DZ opti-mised structure). The average error for bond length is about 1.6%, only two of them in the isomer m3 (Co-N2 and Co-N4) are over 3%, (3.09% and 4.28% respectively). The errormax for bond angle is 2.52%, the bond angles with an over 2% error are only 3.6% out of all bond angles.     

[Co(N-(2-Aminoethyl)-1,3-propanediamine)(1,2-diamino-2-methylpropane)Cl][ZnCl4]配合物部分异构体的结构解析

利用过氧化物合成－分解法制备得到一新的「Ｃｏ（Ｎ－（２－Ａｍｉｎｏｅｈｙｌ）－１,３－ｐｒｏｐａｎｅｄｉａｍｉｎｅ）（１,２－ｄｉａｍｉｎｏ－２－ｍｅｔｈｙｌｐｒｏｐａｎｅ）Ｃｌ」＾２＋体系配合物,并用柱层析分离得到部分几何异体,用单晶Ｘ－射线衍射分析方法解析了其中一反式（三元胺仲氮上的氢相对于Ｃｌ）经式异构体的晶体结构,用二维核磁共振技术的同核质子相关ｇＣＯＳＹ及ＮＯＥＳＹ谱解析了其中一顺式（三元胺仲氮上的树相对于Ｃｌ）经式异构体在溶液中的结构。     

[Co(2,3-tri)(ibn)Cl][ZnCl4]体系一经式异构体的晶体结构及体系异构体的理论计算研究

用单晶X-射线衍射分析方法解析了[Co(2,3-tri)(ibn)Cl]²⁺(2,3-tri=N-(2-氨基乙基)-1,3-丙二胺,ibn=1,2-二氨基-2-甲基丙烷)体系中一经式异构体(m2-[Co(2,3-tri)(ibn)Cl][ZnCl₄])。该晶体属单斜晶系,空间群P2₁/c,a=11.317(3)?,b=14.931(4)?,c=11.646(3)?,β=1     

[Co(2,3-tri)(amp)Cl]ZnCl4体系中三个几何经式异构体的识别

对[Co(2,3 -tri) (amp) Cl] ZnCl42, 3 - tri= N - (2 - aminoethyl) - 1,3 - propanediamine; amp ＝ 2 - (aminomethyl)pyridine)体系进行了合成,分离出四个配合物.用单晶X射线衍射分析了两个结构,用二维核磁共振DQCOSY和NOESY技术联合解析了另一结构.结构解析显示它们为该体系的四个几何经式异构体(meridian isomers).两个晶体结构都属中心对称的空间群,表明它们都是外消旋的对映体.     

[Co(2,3-tri)(amp)Cl][ZnCl_4]体系中部分几何经式异构体的结构测定

利用单晶X射线衍射分析了Co23triampClZnCl423tri=N2Aminoethyl13propanediamineamp=2Aminomethylpyridine体系中的一异构体m3Co23triampClZnCl4·2.5H2O结构用二维核磁共振DQCOSY和NOESY技术联合解析了另两个异构体m2Co23triampClZnCl4及m4Co23triampClZnCl4在溶液中的结构。结构解析显示它们为该体系的三个几何经式异构体。解析的晶体结构属中心对称的空间群表明它是外消旋的对映体。     

[Co(ptma)(amp)Cl]2+体系的一反式经式异构体(m3[ZnCl4]·0.5H2O)的晶体结构

在合成[Co(bpma)(tn)Cl]²⁺体系配合物的实验中,得到[Co(ptma)(amp)Cl]²⁺体系的一反式(ptma中仲胺上的氢相对于Cl)经式异构体(m3[ZnCl₄]·0.5H₂O),其中bpma=N,N′-二(2-吡啶基甲基)胺,tn=1,3丙二胺,ptma=N-(2-吡啶基甲基)丙二胺,amp=2-(氨基甲基)吡啶。此配合物异构体构型选择性形成的原因可能主要是其结构中配体间C-H…π相互作用使之更稳定的结果。利用单晶X-射线衍射法测定的晶体学参数:单斜晶系,空间群C2/c,a=1.55978(19)nm,b=1.33324(16)nm,c=2.2077(3)nm,β=94.832(3)°,V=4.5748(10)nm³,D_c=1.696g·cm^-3,Z=8,F₀₀₀=2360,μ(MoKα)=23.72cm^-1,R=0.0475,R_w=0.1204。配合物离子中Co³⁺为六配位。晶胞中含8个配合物阳离子,8个[ZnCl₄]^2-阴离子及4个水分子,对映体的比例为1∶1。     

[Co(N-(2-Aminoethyl)-1,3-propanediamine)(1,2-diamino-2-methylpropane)Cl][ZnCl4]配合物部分异构体的结构解析

利用过氧化物合成分解法制备得到一新的 [Co(N-(2-Aminoethyl)-1,3 propanediamine)(1,2-diamino-2-methylpropane)Cl]~(2＋)体系配合物，并用柱层析分离得到部分几何异构体。用单晶 X-射线衍射分析方法解析了其中一反式（三元胺仲氮上的氢相对于 Cl）经式异构体的晶体结构，用二维核磁共振技术的同核质子相关 gCOSY及 NOESY谱解析了其中一顺式（三元胺仲氮上的氢相对于 Cl）经式异构体在溶液中的结构。     

[Co(bamp)(pi)Cl][ZnCl4]·H2O一经式异构体的晶体结构及经式异构体的理论计算研究

用X射线单晶衍射法测定了CobamppiClZnCl4体系的一经式异构体m2的晶体结构bamp=26二氨基甲基吡啶pi=12氨基乙基哌啶晶体属于三斜晶系空间群#2a=11.3234b=11.7473c=10.6173α=115.452°β=113.322°γ=77.953°V=1169.763Dc=1.661g·cm-3Z=2F000=596.00μMoKα=23.20cm-1R=0.032Rw=0.044。用量子化学从头计算方法在赝势基组RHF/LANL2DZ的水平上对该体系的两经式异构体在不同介质中的稳定性进行比较其能量差分别为11.3kJ·mol-1气相和27.3kJ·mol-1水介质。从而解释了在水介质条件下难于合成分离出另一经式异构体m1。     

Dynamics of [Zn(D2O)6] in [Zn(D2O)6][SiF6] crystal as studied by 1D, 2D spectra and spin-lattice relaxation time of H NMR

The dynamics of [Zn(D₂O)₆]²⁺ in [Zn(D₂O)₆][SiF₆] was investigated by ²H NMR one-dimensional spectra, two-dimensional exchange spectra and spin-lattice relaxation time (T₁). The lineshapes of those spectra and T₁ were dominated by the 180° flip of the water molecules and the reorientation of [Zn(D₂O)₆]²⁺ about the C₃ axis. The variation of lineshape of the one-dimensional spectrum below room temperature can be explained by only the 180° flip of the water molecules. The spectrum at room temperature showed a typical shape due to the rapid 180° flip of water molecules. The change in lineshape of the one-dimensional ²H NMR spectrum is caused by the three-site jump of [Zn(D₂O)₆]²⁺ about its C₃ axis above 333 K. Information of the reorientation of [Zn(D₂O)₆]²⁺ below 333 K could not be obtained from the one-dimensional spectrum and T₁. In this temperature range, the two-dimensional exchange spectrum was effective for analysis of molecular motion. The effects of multiple motions, the 180° flip of the water molecules and the reorientation of [Zn(D₂O)₆]²⁺ about the C₃ axis, on the lineshape of the two-dimensional exchange spectrum were studied using spectral simulation.     

NMR approach for the identification of dinuclear and mononuclear complexes: The first detection of [Pd(SPh)2(PPh3)2] and [Pd2(SPh)4(PPh3)2] - The intermediate complexes in the catalytic carbon-sulfur bond formation reaction

In the present study we have analyzed the nature of palladium complexes in the catalytic system for selective carbon-sulfur bond formation via the addition of S-S and S-H bonds to alkynes. For the first time the mononuclear and dinuclear palladium complexes were clearly detected by DOSY NMR under the catalytic conditions. It was demonstrated that the concentration of these palladium complexes strongly depends on the amount of phosphine ligand available under reaction conditions.     

[Co(3,3-tri)(amp)Cl]~(2+)四个经式异构体取代、重排反应及其与结构关系的研究

对犤Co(3,3-tri)(amp)Cl犦2+四个几何经式异构体在不同条件下的取代及重排反应进行考察的实验结果表明,四个几何经式异构体碱性环境下的水解速率没有显著的差异,cis异构体比trans异构体约快20倍。实验中没有观察到面式异构体。在100℃二甲亚砜中加热的重排反应实验中可观察到异构体进行配体翻转的历程,如异构体m1-Cl转化为m4-Cl,m2-Cl转化为m3-Cl。m3和m4相对较稳定。利用量子化学从头计算法,在赝势基组RHF/LANL2DZ的水平上对该体系各异构体进行了基态能量、几何优化的计算,与已测定的异构体m3犤ZnCl4犦H2O和m4犤ZnCl4犦晶体结构参数比较,键长及键角的相对误差不超过3%。根据各异构体基态能量说明了各异构体的平衡分布;讨论了键角变形性大小与各异构体反应性大小的关系。     

Polymorphism in [Co(SCN)4(ppz-H)2] (ppz,piperazine)

A one-pot reaction of [Co(NO₃)₂ · 6H₂O and piperazine] with NH₄SCN/NaSCN in water–methanol (1:1) solvent leads to two polymorphs of [Co(SCN)₄(ppz-H)₂] (ppz, piperazine) (I and II). X-ray crystal structure reveals both have same space group but the differences in the alignment of pendant SCN⁻ leads to two polymorphs. In I, trifurcated N–H?S hydrogen bonding plays a prominent role in crystal packing leading to S?S interactions between SCN fragments but in II, no such trifurcation arises and thereby the crystal packing occurs through hydrogen bonding interactions only leading to a distinctly different network topology. TG/DSC and FT-IR study reveal they are enantiotropically related.     

The reactions of 2-benzoylpyridine with [RuHCl(CO)(PPh3)3] and [(C6H6)RuCl2]2

The reactions of [RuHCl(CO)(PPh₃)₃] and [(C₆H₆)RuCl₂]₂ with 2-benzoylpyridine have been examined, and two novel ruthenium(II) complexes – [RuCl(CO)(PPh₃)₂(C₅H₄NCOO)] and [RuCl₂(C₁₂H₉NO)₂] – have been obtained. The compounds have been studied by IR and UV–Vis spectroscopy, and X-ray crystallography. The molecular orbital diagrams of the complexes have been calculated with the density functional theory (DFT) method. The spin-allowed singlet–singlet electronic transitions of the compounds have been calculated with the time-dependent DFT method, and the UV–Vis spectra of the compounds have been discussed on this basis.     

[M(Im)2X2]型配合物的Far-IR和Raman光谱的理论研究

本文用从头计算RHF和密度泛函B3LYP方法以及LanL2DZ，SDD和6-31G(d)基组计算了配合物M(Im)₂X₂ (Im=imidazole；M=Zn(Ⅱ)，Pd(Ⅱ)，Pt(Ⅱ)；X=F，Cl，Br，I)的几何构型以及Far-IR和Raman振动频率。计算结果表明，对Zn(Ⅱ)配合物而言,B3LYP/6-31G(d)方法得到的几何参数与实验值吻合得最好，B3LYP/SDD次之。在计算Far-IR和Raman振动频率时，发现采用6-31G(d)基组，两种方法计算的结果差别不大。对LanL2DZ和SDD基组而言，对计算结果影响较大的是理论方法，基组影响甚微，个别的振动频率基组影响较大，相比较而言，SDD基组得到的结果更好一些。本文所使用的两种计算方法都能得到与实验值比较吻合的结果，而用从头计算RHF方法计算的结果与实验值更接近一些。在此基础上，预测了Pd(Ⅱ)和Pt(Ⅱ)配合物的Far-IR和Raman振动频率。