Molecular and Crystal Structure of 1,10-Phenanthroline Complex with Nitrosonium Cation

1,10-Nitroso-1,10-phenanthrolinium tetrafluoroborate was subjected to X-ray diffraction analysis. A distinctive feature of the complex is the NO group position between two nitrogen atoms of the phenanthroline skeleton, and so the complex may be regarded as belonging to bidentate type. The distance from the N atom of the group to the nitrogens of the skeleton are approximately equal (2.3 Å) and are considerably shorter that the average intermolecular contacts of the pair of nitrogen atoms N...N (3.0 Å). In the crystal two types of cations are present where the NO groups are oriented at angles 54 and 61° with respect to phenanthroline skeleton, and the length of N-O bonds is close to that in NO⁺ cation. The geometrical parameters of cation obtained by ab initio calculations are close to experimental data.     

三氯化钕异丙醇络合物的晶体结构和分子结构

本文报导了X射线衍射法确定的三氯化钕异丙醇络合物[NdCl₃·(CH₃CHOHCH₃)₃]₂的晶体结构。在晶体中每二个钕离子通过二个氯离子形成的氯桥相联,组成一个双核稀土络合物分子。其中每个Nd离子是七配位的。     

Pinched-cone Calix[6]arene: New Synthesis of p- (1,1,3,3-tetramethylbutyl)calix[6]arene. Structure of its 1 : 3 Complex with Chloroform

A new method is described for the synthesis of p-(1,1,3,3-tetramethylbutyl)calix[6]arene isolated ina 30 % yield. For the first time the crystal structure isgiven. The crystals are monoclinic, space group C2/c,a = 24.144(5) Å, b = 14.093(3) Å,c = 26.972(5) Å, = 93.36(3)^circ, V = 9162(3) ų, Z = 4. The macrocycle with C2symmetry presents the pinched-cone conformation. It crystallizes with three chloroform molecules, two of them are positioned in the cones shaped by the phenol moieties; the third chloroform is located in the cavity near the hydroxyl groups; this solvent molecule is disordered around the 2 axis. The packing of the complex is described.     

Synthesis and Molecular Structure of Binuclear Organotin Complex Bridged by Piperazinylbidithiocarbamate Anion

1 INTRODUCTION In recent years, the organotin dithiocarba- mates have been extensively studied due to their biological activities[1～6]; while to our knowledge, polynuclear complexes consisting of multidithiocar- bamatlic acids and alkyltin(IV) have not …     

磷脂酶A2及其复合物的分子动力学研究

本文运用分子动力学方法对磷脂酶A2的自由态以及有机小分子形成的复合物进行了研究．通过模型构建分子动力学模拟得到了磷脂酶A2与配体结合的模型，与磷脂酶A2的自由态相比，其口袋更为宽松，组成口袋的残基的结构趋于稳定，但催化残基的柔性变大．研究结果为药物分子设计提供了有用的信息．     

NMR and MO Studies on the Molecular Structure of a Fluoranthene-Benzene Complex

Fluoranthene (FA) forms a 1:1 van der Waals complex with benzene in cyclohexane. The ¹H NMR spectrum of this complex shows that the FA moiety in the complex state has five kinds of hydrogen atoms and that the ¹H NMR peaks assigned to the protons attached to the naphthalene skeleton are largely shifted to higher magnetic field on complex formation with benzene. These observations indicate that the complex takes the structure of C_S symmetry, in which the benzene molecule mainly interacts with the electronic system localized on the naphthalene moiety of FA. The present ab initio calculations reproduce well the ¹H NMR spectral shifts mentioned above and the experimentally predicted C_S structure of the complex. According to the PPP calculations for the electronic absorption spectral changes on the complex formation, the FA-benzene complex is considered to take a sandwich type structure.     

NMR and MO Studies on the Molecular Structure of a Fluoranthene-Benzene Complex

Summary. Fluoranthene (FA) forms a 1:1 van der Waals complex with benzene in cyclohexane. The ¹H NMR spectrum of this complex shows that the FA moiety in the complex state has five kinds of hydrogen atoms and that the ¹H NMR peaks assigned to the protons attached to the naphthalene skeleton are largely shifted to higher magnetic field on complex formation with benzene. These observations indicate that the complex takes the structure of C_S symmetry, in which the benzene molecule mainly interacts with the electronic system localized on the naphthalene moiety of FA. The present ab initio calculations reproduce well the ¹H NMR spectral shifts mentioned above and the experimentally predicted C_S structure of the complex. According to the PPP calculations for the electronic absorption spectral changes on the complex formation, the FA-benzene complex is considered to take a sandwich type structure.     

邻苯二甲酸·邻菲咯啉合钴配合物的合成及其二维超分子结构

合成了邻苯二甲酸.邻菲咯啉合钴的配合物[Co(C8H4O4)(C12H8N2)(H2O)3].H2O,并用元素分析、红外光谱和X射线单晶衍射等手段进行了表征.结果表明,该配合物属单斜晶系,P2(1)/n空间群:a=0.757 1(2)nm,b=1.373 7(3)nm,c=2.001 5(4)nm,β=95.56(1)°,V=2.071 9(8)nm3,Mr=475.31,Dc=1.524g/cm-3,Z=4,F(000)=980,μ(MoKα)=0.879 mm-1,R1=0.034 8,wR2=0.071 1.在配合物中钴的配位数为6,具有畸变的八面体配位构型.晶体通过分子间氢键形成一维的无限链状结构.链与链之间通过芳环堆积作用构成二维超分子网络.     

高分辨NMR研究金属盐对水溶性铑膦配合物分子结构的影响

用高分辨NMR研究了NaCl、NiSO₄、CuSO₄、Fe₂(SO₄)₃和Cr₂(SO₄)₃对水溶性铑膦配合物HRh(CO)(TPPTS)₃[TPPTS;P(m-C₆H₄SO₃Na)₃]分子结构的影响.³¹P(¹H)和¹HNMR谱显示,于室温下在HRh(CO)(TPPTS)₃中加入的NaCl或NiSO₄对配合物的特征³¹P(¹H)和¹HNMR谱峰无明显影响;当加入CuSO₄后,配合物的Rh-H质子峰强度弱化明显,进而消失,且原配合物的特征磷谱峰强度减弱,新生成的磷物种谱峰逐渐成为磷谱的主要物种.当加入Fe₂(SO₄)₃或Cr₂(SO₄)₃后,三价金属离子的强顺磁性使NMR灵敏度下降,谱峰宽化,该2种盐均易与水溶性铑膦配合物产生强烈的相互作用,易使配合物特征谱峰消失.实验结果表明,上述金属盐对配合物结构破坏性大小的顺序为;Fe₂(SO₄)₃>Cr₂(SO₄)₃>CuSO₄》NiSO₄～NaCl.     

3:1 Molecular Complex of Hydroquinone and C60

The preparation of a 3:1 complex of hydroquinone (HQ) and C₆₀, (HQ)₃C₆₀, is reported and its X-ray crystal structure described. The HQ host builds up a single H-bonded super-polonium network with super-cubes as building blocks, which accommodate the large C₆₀ guest molecules. The enclathration of C₆₀ is rather tight (high density of the complex) owing, in part, to favorable charge-transfer host-guest interactions (π-donor-acceptor complex). Nonetheless, the C₆₀ molecules arc orientationally disordered, and no individual bond lengths could be measured. In contrast, the HQ host network is essentially ordered and well-defined with normal intramolecular geometry. No appreciable (powder) conductivity could be observed for (HQ)₃C₆₀, yet ESR spectra of single crystals showed interesting narrow signals.     

联苯甲酰双缩氨基脲硫氰酸根硝酸根混合阴离子配位钕(Ⅲ)配合物的合成与结构

合成了联苯甲酰双缩氨基脲硫氰酸根、硝酸根混合配位的钕(Ⅲ)配合物。在此配合物中只有1个链状配体,另有2个硫氰酸根、1个硝酸根和1个水分子参与配位。总配位数是9。晶体结构分析表明,该配合物晶体属三斜晶系,P空间群。晶胞参数a=10。866(2),b=13.687(3),c=15.433(3),α=98.75(4)°,β=107.64(5)°,γ=112.14(5)°。最终偏差因子R=0.075。用INDO方法计算结果表明:NCS对Nd(Ⅲ)的配位比=C基对Nd(Ⅲ)的配位强。     

Molecular Structure of the Ethylenediammonium Complex of a Tetracarboxy-macrocyclic Receptor Molecule

The crystal and molecular structure of the complex formed by the ionized bistartro-[18]-crown-6 receptor molecule 1 with the ethylenediammonium cation, is described. The macrocycle is roughly planar, the carboxy groups of each tartaric acid residue being in a diaxial relationship and extending above and below this plane. This conformation allows ‘lateral’ interactions with bound species to occur. The substrate is sandwiched between two macrocycles, with one of its NH heads anchored to the polyether core, and the other one in contact with the two carboxy groups of the neighboring molecule.     

含咪唑盐的三联吡啶铜配合物的合成和分子结构

通过带有不同长度的4-(4-氯烷氧基苯基)-2,2':6,2″-三联吡啶和N-甲基咪唑在甲苯中加热反应,制备了3种由烷氧基桥联的新型三联吡啶咪唑配体。研究了配体和过渡金属离子的配位反应。测定了三联吡啶咪唑铜配合物的单晶分子结构,在铜配合物中,Cu(Ⅱ)和两个三联吡啶单元形成扭曲八面体配位方式。Monoclinic,空间群P 21/c;a=1.7229(3) nm,b=1.5924(2) nm,c=2.1590(3) nm,α=90°,β=101.332(2)°,γ=90°,M_r=1298.09,V=5.8078(15) nm³,D_c=1.485 mg/m³,Z=4, F(000)=2684。     

[Cu(L-Ile)(Phen)(H2O)(ClO4)]的合成、结构及稳定性研究

合成了三元混配配合物[Cu(L-Ile)(Phen)(H20)(ClO4)](L-Ile=L-异亮氨酸,phen=1,10-邻菲咯啉),通过红外光谱、紫外-可见光谱、摩尔电导率、X射线单晶结构分析,对配合物进行了表征.该晶体属单斜晶系,P21空间群,晶胞参数:a=1.1704(5)nm,b=0.8090(5)nm,c=2.1822(5)nm,β=98.061(5)°,Z=2,Dx=1.60Mg·m-3,R1=0.0462,wR2=0.1225.每个配合物分子中Cu(Ⅱ)离子与一个L-Ile(N,O)配体、一个Phen(N,N)配体、一个H2O(O)配体及一个ClO4-(O)形成六配位的畸变八面体构型.本文还用电位滴定法测定了配合物的稳定常数,结果表明,配合物具有高的稳定性.