钼铁混合金属原子簇化合物[(η5-C5H5)4Mo4Fe2(μ3-S)5(CO)5]的合成和结构

(η~5-C_5H_5)_4Mo_4Fe_2(μ_3-S)_5(CO)_5 have been prepared from (η~5-C_5H_5)_2Mo_2(CO)_6 and Fe_8S_2(CO)_9 under toluene reflux for 14.5 hrs.The crystal and molecular structures of (η~5-C_5H_5)_4Mo_4Fe_2(μ_3-S)_5(CO)_5 were studied by X-ray structure analysis. The Crystallographic data are as follows: monoclinic, space group P2_1/n, unit cell: a=1.0589(4), b=1.7260(4), c=1.8963(4) nm, β=101.44(2)°, V=3.3967 nm, D_c=2.06 gcm~(-3) for Z=4, X-ray data were obtained over the range of 2°<2θ<50° via the ω-2θ scan mode with MoKα radiation on an Enraf-Nonius CAD4 diffractometer. The structure was solved by direct method (MULTAN) and refined by full matrix least-squares techniques for 3993 reflections with I>2σ(I), The final R=0.081. Figure 1 illustrates the configuration of the molecule (η~5-C_5H_5)_4Mo_4Fe_2(μ_3-S)_5(CO)_5, composing of a cubane-like (FeMo_3S_4) core and a trigonal pyramid (MoFe_2S) core, which linked by sharing Fe(1) atom.     

双核银络合物[Ag_2(dppm)_2(Py)_2(μ-Cl)]ClO_4的合成与结构

二-(二苯基膦)甲烷(dppm)是一种易与金属形成多核络合物的有机膦配体。我们用dppm作为配体合成了一系列银的多核络合物,并对其结构进行了研究。本文报导了其中一个双核化合物[Ag_2(dppm)_2(Py)_2(μ-Cl)]ClO_4的合成及晶体结构、分子结构的测定。     

2-(2'-吡啶基)-5-甲苯并噻唑及其二氯二乙基锡(Ⅳ)络合物的结构以及抗肿瘤有机锡络合物分子设计的展望

X-射线单晶衍射法测定了2-(2′-吡啶基)-5-甲苯并噻唑(1)及其二氯二乙基锡(Ⅳ)络合物(2)的结构。晶体(1)属单斜晶系,空间群为P2_1/n,晶胞参数a=5.808(2),b=10.283(3),c=18.373(3),β=91.48(2)°,Z=4,D_c=1.370g·cm~(-3),偏离因子R=0.047。晶体(2)属单斜晶系,空间群P2_1/c,晶胞参数a=17.271(2),b=9.411(1),c=14.015(2),β=122.98(1)°,Z=4,D_c=1.648g·cm~(-3),偏离因子R=0.047。络合物中Sn—N平均键长已达2.50。参考顺铂类药物研究经验,展望了抗肿瘤有机锡络合物发展的前景。     

膦桥多核银络合物[Ag4(dppe)3(NO3)4]的合成与结构

A new polynuclear silver complex with bridging diphorsphine ligand has been synthesized and characterized by :single cryatsl X-ray diffraction method The compound crystallizes in the triclinic space group P1 with a=1.27489, b=1.34715, c=1.47015 nm; α=59.747, β=63.949, γ=70.196°; V=1.9369 nm. The simplest formularis [Ag_4· dppe)_3(NO_3)_4], Mr=1874.79, D_c=1.607 g·cm~(-3), Dm=1.62 g·cm~(-3), μ(MoKa)=11.69 cm~(-1), F(OOO)=942. The structure was solved by conventional heavy-atom techniques and refined by full-matrix least squares to give discrepany indices of R=0.048 and RW=0.060(W=1/[σ(Fo)~2+(PWT*Fo)~2+QWT]-Fo) for 5052 reflections. An empirical absorption correction program DIFABS was performed.Silver atoms are linked by bridging ligands of dppe and nitrate, forming a network extending in space. Each structural unit contains two binuclear subunits, of which silver atoms are bridged by nitrates. The two subunits are connected by one dppe ligand. Silver atoms are not equivalent in subunit and one of the nitrates functions not only as a monodentate bridging ligand, but also as an asymmetric bidentate chelating lingand. All coordinate configurations of silver are shown as distorted tetrahedron.     

乙酰丙酮光二聚产物C10H16O4的晶体结构和分子力学计算

α,β-不饱和羰基化合物与共轭烯烃的光聚合是一类饶有兴趣的反应,通常认为是一激发态分子与一基态分子发生[2 2]加成.在考察乙酰丙酮的光聚合反应产物的谱学数据时,发现产物可能系结构(Ⅰ),(Ⅱ),(Ⅲ)或(Ⅳ)中的一种但难以作出唯一的指定。这与我们研究乙酰丙酮和1-萘甲酸甲酯的光环加成产物结构所遇到的问题相似。为全面了解乙酰丙酮光二聚反应,本文报导X射线单晶结构分析和分子力学能量优化的结果,讨论了其可能的反应途径。     

膦桥多核银络合物[Ag_4(dppe)_3(NO_3)_4]的合成与结构

膦桥过渡金属络合物和簇合物由于独特的结构特性和催化性能而引起人们的重视,许多这类的化合物已被合成和表征,但相应的银化合物的研究则较少。近年来,我们利用双齿膦配体dppm(Pb_2pCH_2PPh_2)和dppe(Ph_2PCH_2CH_2PPh_2)合成了一系列新型的膦配体银络合物。这些双齿膦配体结合硝酸根、氯离子和吡啶等配体以多种方式与银原子配位,呈现了丰富的配位结构特征。本文报导另一个新的dppe多核银络合物的合成与晶体结构测定的结果,讨论了其特殊的结构特征。     

钼铁混合金属原子簇化合物[(η~5-C_5H_5)_4Mo_4Fe_2(μ_3-S)_5(CO)_5]的合成和结构

含Ⅵ主族的混合金属原子簇化合物可作为重要的催化剂,这种催化剂在均相催化方面,由于异核原子簇中不同金属具有不同的反应性,可能表现出独特的催化性能,特别是Mo-Fe-S原子簇化合物,除了可作为加氢脱硫的催化剂外,又可能是固氮酶活性中心的模型物,     

齐聚噻吩衍生物在溶液中的光物理和电化学性质

The photophysical and electrochemical properties of a family of oligothiophene derivatives in solution werestudied.It was found that the cyano and the vinyl group could increase fluorescence yield in solution,while theformyl and carboxyl group could decrease energy gap.With increasing the chain length of thiophene ring,the oxi-dation potential could be decreased.     

膦桥双核银配合物[Ag(dppm)NO3]2的合成与结构

[Ag(dppm)NO3]2晶体属单斜晶系, 空间群Cc。单胞参数: a=1.2704(1),b=1.7028(2), c=2.2634(5)nm; β=100.66(1)°; Z=4; V=4.8117nm^3; Dc=1.530g·cm^-^3。两个双齿膦配体dppm连续两个银离子形成一个扭曲八元环。Ag-Ag间距离为0.3089nm, 硝酸根以不对称配位方式与银离子配位, 结构测定的最后偏离因子R=0.050。