高电势铁硫蛋白的模型化合物：2,4,6—三苯基苯硫酚的4Fe4S簇合 …

新型簇合物（ｎ－Ｂｕ４Ｎ）２「Ｆｅ４Ｓ４（ｔｐｂｔ）４」（ｔｐｂｔ－２，４，６－三苯基苯硫酚基）通过２，４，６－三苯基苯硫酚和（ｎ－Ｂｕ４Ｎ）２「Ｆｅ４Ｓ４９Ｓ－ｔ－Ｂｕ０４」在ＤＭＦ中进行配体交换反应合成得到。该簇合物在ＣＨ３ＣＮ溶液中的「Ｆｅ４Ｓ４」＾３＋／２＋和「Ｆｅ４Ｓ４」＾２＋１／＋的氧化还原电位分别为－０．１４和－１．３１ＶｖｓＳＣＥ。     

簇合物〔WOS_3Cu_3(V-pic)_6〕Br 的合成和晶体结构

簇合物〔ＷＯＳ３Ｃｕ３（γ－ｐｉｃ）６〕Ｂｒ（Ｃ３６Ｈ４２ＢｒＯＮ６Ｓ３Ｃｕ３Ｗ, Ｍｒ＝ １１２５．３４） 属于三方晶系,空间群为Ｐ３,晶胞参数为：ａ＝ １２．２６４（５）, ｃ＝ １５．９０５（８） , γ＝ １２０．００°, Ｖ＝２０７１（２）３, μ（ＭｏＫα）＝ ５．４９０ｍ ｍ － １, Ｚ＝ ２, Ｄｃ＝ １．８０４ｇ／ｃｍ ３, Ｆ（０００）＝ １１０４ , Ｒ＝ ０．０５２ , ｗ Ｒ＝ ０．０５３． 可观察衍射点１９０１ （Ｉ≥２σ（Ｉ））。该簇合物的分子由游离的阴离子Ｂｒ－ 和簇阳离子〔ＷＯＳ３Ｃｕ３（γ－ｐｉｃ）６〕＋ 构成。阳离子中的Ｗ 原子、Ｓ原子和Ｃｕ原子构成１ 个巢状骨架结构,且该结构中存在一个通过Ｗ 和Ｏ原子的Ｃ３ 轴。     

固相配位化学反应的研究：LXⅧ.2—氨基嘧啶与Cu（Ⅱ）盐的固—固相化学反应

室温或近室温条件下，２－氨基嘧啶（ＡＰ）与４种铜（Ⅱ）盐ＣｕＣｌ２．２Ｈ２Ｏ，ＣｕＢｒ２，ＣｕＳＯ４．５Ｈ２Ｏ，ＣｕＡｃ２，Ｈ２Ｏ发生固－固相化学反应，生成３类不同配位比（Ｃｕ／ＡＰ）分别为２：２、１：１和１：２）的２－氨基嘧啶合铜与合物，用元素分析，碘量法，电感耦合等离直读光谱、ＩＲ、ＸＲＤ、ＵＶ、ＥＳＲ等方法表征了固相反应产物，不同阴离子铜盐的结构是影响固相反应的主要原因。讨论了固相反应的过程     

亲水性咔唑共聚物和钼簇合物之间的作用及其溶液荧光

研究了Ｎ－乙烯基咔唑－丙烯酸共聚物（ＮＶＣ－ＡＡ）和微量的钼簇合物「Ｍｏ３Ｏ２（Ｏ２ＣＣＨ３）６（Ｈ２Ｏ）３」Ｂｒ２．２Ｈ２Ｏ在水溶液相互作用及其溶液荧光。实验发现,体系中存在单体荧光（３７５ｎｍ）和二聚体激态缔合物荧光（５００ｎｍ）。荧光强度分别随钼簇合物的浓度啬和ｐＨ值的提高而增强。     

具有链结构的新颖三核簇合物Mo3S4（μ—CH3C6H4SO3）[S2P（OC2H5）2…

三核钼簇Ｍｏ３Ｓ４（ｄｔｐ）４．ＨＯ２１（ｄｔｐ＝Ｓ２Ｐ（ＯＣ２Ｈ５）２）和对甲基苯磺酸反应，以Ｃ２Ｈ５ＯＨ做为介质，在ＣｄＣｌ２和ＰＰｈ３参预下获得新颖的三核簇合物Ｍｏ（μ３－Ｓ）（μ－Ｓ）３－（μ－ＣＨ３Ｃ６Ｈ４ＳＯ３）（ｄｔｐ）．（Ｃ２Ｈ５ＯＨ）２．本文报导化合物２的晶体结构、红外光谱、紫外光谱研究结果。簇合物的分子结构存在一个非络合物的对甲基苯左侧酸基和两个Ｍｏ的桥式络合，颇为罕见。而簇分     

大核镉硫簇合物的研究：（Ⅱ）两个八核镉在充簇合物的合成与晶体结构

利用ＣＳ２与镉硫化合物在溶剂中反应产生Ｓ＾２－来合成大核镉硫簇合物，得到了两个新的大核镉硫簇合物，并测定了其晶体结构，化合物（Ⅰ）为（Ｍｅ４Ｎ）２［ＳＣｄ８（ＳＰｈ）１２Ｃｌ４］，晶体属立方晶系，空间群Ｐａ３，ａ＝２６．７８２（３）Ａ，Ｖ＝１９２１１（４）Ａ＾３，Ｄｃ＝１．７５０ｇ／ｃｍ＾３，Ｚ＝８．１６３７个衍射点参与修正，Ｒ＝６．９６％，化合物（Ⅱ）为［Ｃｄ（Ｈ２Ｏ）６］［ＳＣｄ８（ＳＰｈ）１     

含MoFe3Se4类立方烷核芯簇合物的合成与结构表征

室温下［Ｅｔ_４Ｎ］_２ＭｏＳｅ_４, ＦｅＣｌ_２和 Ｒ_２ＮＣＳ_２Ｎａ在 ＤＭＦ和 ＣＨ_３ＣＮ混合溶剂中反应,得到含ＭｏＦｅ_３Ｓｅ_４核芯的Ｍｏ－Ｆｅ－Ｓｅ簇合物ＭｏＦｅ_３Ｓｅ_４（μ－Ｒ_２ＮＣＳ_２）_２（Ｒ_２ＮＣＳ_２）_４（Ｒ２＝Ｍｅ_２（１）,Ｅｔ_２（２）,Ｃ_４Ｈ_８（３））．化合物２的单晶Ｘ射线衍射分析表明,其分子结构为２个桥式和４个螫合Ｅｔ_２ＮＣＳ_２~－配体包围的一个扭曲类立方烷Ｍ_４Ｓｅ_４簇核对３个化合物的ＣＶ进行了表征,它们在ＤＭＳＯ溶液中的电化学行为表现出了多电子可逆的传递过程．     

标题固相合成V—Cu—S簇合物;VS4（CuPPh3）5X2（X=Br,I）的晶体结构

标题两个化合物是在反应体系（ＮＨ４）３ＶＳ４／ＣｕＸ／ＰＰｈ３／ＮＥｔ４Ｘ中采用低温固相反应方法得到的，单晶Ｘ射线结构分析表明：ＶＳ４（ＣｕＰＰｈ３）５Ｂｒ２（Ｉ）和ＶＳ４－（ＣｕＰＰｈ３）５Ｉ２是同构的，其中晶体属于单斜晶系，空间群Ｐ２１ｃ，Ｍｒ＝１９６８．２，ａ＝２０．２１５（７），ｂ＝１５．６９１（４），ｃ＝２７．３４５（９）Ａ，β＝９５．２９（３）°，Ｖ＝８６３７．０Ａ＾３，Ｚ＝４，Ｄｃ＝     

固相配位化学反应的研究LXⅧ．2－氨基嘧啶与Cu（Ⅱ）盐的固－固相化学反应

室温或近室温条件下，２－氨基嘧啶（ＡＰ）与４种铜（Ⅱ）盐ＣｕＣｌ＿２·２Ｈ＿２Ｏ、ＣｕＢｒ＿２、ＣｕＳＯ＿４·５Ｈ＿２Ｏ、ＣｕＡｃ＿２·Ｈ＿２Ｏ发生固－固相化学反应，生成３类不同配位比（Ｃｕ／ＡＰ分别为２：２、１：１和１：２）的２－氨基嘧啶合铜配合物。用元素分析、碘量法、电感耦合等离子直读光谱（ＩＣＰ）、ＩＲ、ＸＲＤ、ＵＶ、ＥＳＲ等方法表征了固相反应产物。不同阴离子铜盐的结构是影响固相反应的主要原因。讨论了固相反应的过程。反应沿晶格结构变化最小（活化能最低）的途径进行。     

类立方烷型簇合物[Bu4N]3[WAg3S4I4]的固相合成和晶体结构

由（ＮＨ４）２ＷＳ４，ＡｇＩ和Ｂｕ４ＮＢｒ用低热温固相反应合成了类立方烷簇合物＜Ｂｕ４Ｎ＞３．＜ＷＡｇ３Ｓ４Ｉ４＞。用Ｘ射线单晶衍射法测定其晶体结构。     

Synthesis in solid state, structural regularity and reaction mechanism for [VS_4-Cu_n] clusters

The reaction system (NH4)3VS4/CuCl/PPh3/Et4NBr afforded a series of [VS4-Cun] dusters with various core configurations in the solid state at low heating temperature. The structural regularity of [VS4-Cun] dusters and the influence of the CuCl:(NH4)3VS4 ratio as well as that of reaction temperature and time on the formation of duster core have been summarized. The reaction mechanism of forming V-Cu-S clusters has also been explored.     

NMR studies on [VS4–Cun] (n=3, 4, 5, 6) clusters

The complexes containing [VS₄–Cu_n] (n=3, 4, 5, 6) clusters were characterized by NMR spectra. The relationship between the ⁵¹V NMR chemical shift and the number of copper atoms in a cluster was established. ⁵¹V NMR chemical shifts were used to identify possible products of the reactions of Cu(PPh₃)Cl and [VS₄–Cu₃] with various mole ratios in CDCl₃ in order to study their reaction mechanism in solution. The results demonstrate that the reaction of tetranuclear [VS₄–Cu₃] and Cu(PPh₃)Cl in CDCl₃ successively yields penta-, hexa- and hepta-nuclear V–Cu–S heterometallic clusters when the mole ratio of [VS₄–Cu₃] to Cu(PPh₃)Cl is decreased, and the process can be reversed when [VS₄–Cu₃] is added to [VS₄–Cu₆] gradually. Theoretical calculations were also carried out to explain the experimental results.     

Synthesis and X-ray crystallographic characterization of copper and iron complexes with tetradentate-N4 ligands: Reactivity towards catechol oxidation

The reaction of copper chloride dihydrate and ferric chloride hexahydrate with a tripodal N₄ ligand (ntb) under mild conditions affords two novel complexes [Cu(ntb)Cl]₂[CuCl₄] · 2H₂O (1) and [Fe(ntb)Cl₂]Cl · 3H₂O (2). The reaction of ferric chloride with another N₄ ligand, bispicpn, forms an octahedral mononuclear complex, [Fe(bispicpn)Cl₂]Cl (3). Single-crystal X-ray structural studies of 1, 2 and 3 reveal the formation of hydrogen-bond sustained 3D, 2D and 1D networks, respectively, involving (N–HO) and (N–HCl) interactions. The packing arrangement in 2 further reveals the existence of hexagonal channels with helical propagation along the diagonal of the crystallographic b- and c-axes. The reactions of these complexes with 3,5-di-tert-butylcatechol have been studied in dimethylformamide. NMR techniques have been used to identify the reaction products.     

Synthesis and X-ray crystal structures of [Ru4H4(CO) 11(PPh3)] and [Ru4−x IrxH2−x(CO) 12(PPh3) ] (x = 0 or 1)

Three tetranuclear clusters [Ru₄H₄(CO)₁₁(PPh₃)] (1), [Ru₄H₂(CO)₁₂(PPh₃)] (2) and [Ru₃IrH(CO)₁₂(PPh₃)] (3) were formed in the reaction of [Ir(CO)Cl(PPh₃)₂] and Na[Ru₃H(CO)₁₁] in tetrahydrofuran. Complexes 1–3 were characterized by IR and ¹H and ³¹P NMR, and the structure of the clusters was confirmed by single crystal X-ray analysis. In 2 and 3 one of the carbonyls bridges between two ruthenium atoms; otherwise the compounds contain only terminal carbonyls.     

低温固相合成V-Cu-S簇合物:VS_4(CuPPh_3)_5X_2(X=Br,Ⅰ)的晶体结构

标题两个化合物是在反应体系（NH4）3VS4／CuX／PPh3／NEt4X（X=Br，Ⅰ）中采用低温固相反应方法得到的，单晶X射线结构分析表明：VS4（CuPPh3）5Br2（Ⅰ）和VS4－（CuPPh3）5I2（Ⅱ）是同构的，其中晶体（Ⅰ）属于单斜晶系，空间群P211／c,Mr=19682，a=20.215（7），b=15．691（4），c=27.345（9）A，β=95.29（3）°，V=8637.0A3，Z=4，Dc=1．51g／cm3，F（000）=3968，μ（MoKa）=24．6cm-1，R=0.078。晶体（Ⅱ）亦属于单斜晶系，Mr=2062．2，空间群P21／c,a=20.1613（2），b=15．9718（2），c=27.7427（3）A，β=96.07（1）°，V=8883．4A3，Z=4，Dc=1．54g／cm3，F（000）=4112，μ（MoKa）=22．0cm－1，R=0．068。簇合物（Ⅰ）和（Ⅱ）的簇芯结构可描述为共面的2个开口的扭曲立方烷，在这两个簇合物中，V原子仍保持反应起始物[VS4]3-中的四面体配位，5个CU原子呈近似的四方锥排列，V原子基本上处于Cu5四方锥底面的中心。其中1个Cu原子为平面三角形配位，另外4个Cu原子为严重畸变的四面体配位。     

Formation of furo[3,2- c ]quinolone-2-carbonitriles and 4-oxo-4,5-dihydrofuro[3,2- c ]quinolone-2-carboxamides from reaction of quinoline-2,4-diones with 2-[bis(methylthio)methylene]malononitrile

Quinoline-2,4-diones reacted with 2-[bis(methylthio)methylene]malononitrile in DMF/Et3N to produce 3-(methylthio)-4-oxo-4,5-dihydrofuro[3,2-c]quinolone-2-carbonitriles and 3-(methylthio)-4-oxo-4,5-dihydrofuro[3,2-c]quinolone-2-carboxamides in state of 2-imino-substituted 4-(methylthio)-5,6-dihydro-2H-pyrano[3,2-c]quinolone-3-carbonitriles. The structures of all new products were proved using NMR, IR, and mass spectral data. The possible mechanism for the reaction is also discussed.     

Cubane-type Fe4S4 clusters with chiral thiolate ligation: formation by ligand substitution, detection of intermediates by 1H NMR, and solid state structures including spontaneous resolution upon crystallization

Cubane-type clusters [Fe(4)S(4)(SR*)(4)](2-) containing chiral thiolate ligands with R* = CH(Me)Ph (1), CH(2)CH(Me)Et (2), and CH(2)CH(OH)CH(2)OH (3) have been prepared by ligand substitution in the reaction systems [Fe(4)S(4)(SEt)(4)]/R*SH (1-3, acetonitrile) and [Fe(4)S(4)Cl(4)](2-)/NaSR*(3, Me(2)SO). Reactions with successive equivalents of thiol or thiolate generate the species [Fe(4)S(4)L(4-n)(SR*)(n)](2-) (L = SEt, Cl) with n = 1-4. Clusters 1 and 2 were prepared with racemic thiols leading to the possible formation of one enantiomeric pair (n = 1) and seven diastereomers and their enantiomers (n = 2-4). Reactions were monitored by isotropically shifted (1)H NMR spectra in acetonitrile or Me(2)SO. In systems affording 1 and 2 as final products, individual mixed-ligand species could not be detected. However, crystallization of (Et(4)N)(2)[1] afforded 1-[SS(RS)(RS)] in which two sites are disordered because of occupancy of R and S ligands. Similarly, (Et(4)N)(2)[2] led to 2-[SSSS], a consequence of spontaneous resolution upon crystallization. The clusters 3-[RRRR] and 3-[SSSS] were obtained from enantiomerically pure thiols. Successive reactions lead to detection of species with n = 1-4 by appearance of four pairs of diastereotopic SCH(2) signals in both acetonitrile and Me(2)SO reaction systems. Identical spectra were obtained with racemic, R-(-), and S-(+) thiols, indicating that ligand-ligand interactions are too weak to allow detection of diastereomers (e.g., [SSSS] vs [SSRR]). The stability of 3 in Me(2)SO/H(2)O media is described.     

n + n]-Heterometallomacrocyclic complexes (n > or = 2) prepared from platinum(II)-centred ditopic 2,2':6',2'-terpyridine ligands: dimensional cataloguing by pulsed-field gradient spin-echo NMR spectroscopy

The reaction of 4'-(2-propyn-1-oxy)-2,2':6',2'-terpyridine (HC[triple bond]CCH2Oterpy) with trans-[PtI2(PR3)2] (R = Et, (n)Bu, Ph) results in the regioselective formation of the metalloditopic ligands trans-[Pt(C[triple bond]CCH2Oterpy)2(PR3)2], crystallographic data for which are presented. Each ditopic ligand reacts with FeCl(2).4H(2)O to give heterometallomacrocycles, the smallest of which is a [2 + 2] macrocycle, confirmed structurally for R = Et. The NMR spectroscopic data confirm the formation of symmetrical species, i.e. macrocyclic and not polymeric species. The distribution of products has been investigated using pulsed-field gradient spin-echo (PGSE) diffusion NMR spectroscopy, and indicates that the kinetic products from the reactions of 1, 2 or 3(L) with iron(II) are [Fe(n)L(n)](2n+) with n = 2, 3 or 4. For L = 1 and 2, these mixtures of products convert in solution to the thermodynamically favoured [Fe(2)L(2)](4+).     

微波辐射下2-氨基-7-甲基-4-芳基-5-氧代-4H,5H-吡喃并[4,3-b]吡喃-3-腈的一步合成

芳醛、丙二腈与6-甲基-4-羟基-2-吡喃酮在微波辐射下, 一步反应得到一系列2-氨基-7-甲基-4-芳基-5-氧代-4H,5H-吡喃并[4,3-b]吡喃-3-腈, 该反应时间短、产率较高、环境友好、后处理简单. 产物的结构经红外光谱、核磁共振谱和元素分析表征, 产物4g的结构经单晶X射线衍射进一步确证; 并对反应过程提出了可能的机理.     

Halogen exchange and scrambling between C-X and M-X' bonds in copper, nickel, and cobalt complexes of 6,6'-bis(bromo/chloromethyl)-2,2'-bipyridine. structural, electrochemical, and photochemical studies

The synthesis, reactivities, spectroscopic, electrochemical, and structural studies of copper(I), copper(II), nickel(II), and cobalt(II) complexes of 6,6'-bis(bromomethyl)-2,2'-bipyridine (bpy-Br2) and 6,6'-bis(chloromethyl)-2,2'-bipyridine (bpy-Cl2) have been reported. The copper(I) complex [CuI(bpy-Br2)2](ClO4) (1) has been obtained in two crystallographic modifications, in which the coordination geometry of the metal center has the D2d symmetry. The reaction between CuCl2.2H2O and bpy-Br2 has been followed spectrophotometrically at 45 degrees C over a period of 7 h, and a mechanism for the intramolecular halogen exchange and scrambling in the initially formed compound [CuII(bpy-Br2)Cl2] (5) has been proposed. Depending upon the reaction conditions, several halogen-exchanged products, namely [CuII(bpy-Br1.86Cl0.14)(Cl1.89Br0.11)] (2), [CuII(bpy-Br1.81Cl0.19)(Cl1.70Br0.30)(H2O)] (3), and [CuII(bpy-Br0.63Cl1.37)(Cl0.54Br1.46)] (4), have been isolated in crystalline form. The reaction between bpy-Cl2 and CuCl2.2H2O provides [CuII(bpy-Cl2)Cl2] (7) and [CuII(bpy-Cl2)Cl2(H2O)] (8), whereas CoCl2.6H2O and NiCl2.6H20 on reaction with bpy-Br2 under boiling condition produce [CoII(bpy-Br0.5Cl1.5)(ClBr)] (11) and [NiII(bpy-Br0.46Cl1.54)(Cl0.73Br1.27)(H2O)] (12), respectively. The X-ray structures determined for the 4-coordinate compounds 2, 4, and 7 show flattened tetrahedral geometry for the metal center with the D2 symmetry. Both 5-coordinate compounds 3 and 12 have square pyramidal geometry, and whereas the nickel(II) complex 12 has near-perfect geometry (tau = 0.015), considerable distortion is observed for the copper(II) complex 3 (tau = 0.25). Complexes [CuII(bpy-Cl2)Br2] (6) and [CuII(bpy-Br2)Br2] under boiling condition undergo photoreduction to produce the dimeric copper(I) complexes [{CuI(bpy-Cl1.30Br0.70)(mu-Br)}2](9) and [{CuI(bpy-Br2)(mu-Br)}2] (10), respectively. The fact that the photoreduction of [CuII(bpy-Cl2)Br2] (6) and [CuII(bpy-Br2)Br2] do not take place in absence of light has been established by spectrophotometric measurements. The crystal structures of 9 and 10 have been determined. The electrochemical behavior of all the copper complexes 1-10 has been studied in acetonitrile and dichloromethane. The E1/2 values for the CuI/CuII redox couples show strong solvent dependence and for a given system the E1/2 value is more positive in dichloromethane relative to that in acetonitrile. For the compounds [CuII(bpy-Br2-xClx)(Cl2-yBry)] (x = 0-2, y = 0-2), the E1/2 values become more positive with the increase of y value.