Synthesis and X-ray crystal structure of the electron-deficient metal carbonyl cluster [Os3(CO)5(μ3-H)(μ-H)(μ-PtBu2)2(μ-Ph2PCH2PPh2)]

The reaction of [Os₃(CO)₁₀(μ-dppm)] (1) with ^tBu₂PH in refluxing diglyme results in the electron-deficient metal cluster complex [Os₃(CO)₅(μ₃-H)(μ-P^tBu₂)₂(μ-dppm)] (2) (dppm = Ph₂PCH₂PPh₂) in good yields. The molecular structure of 2 has been established by a single crystal X-ray structure analysis. In contrast to the known homologue [Ru₃(μ-CO)(CO)₄(μ₃-H)(μ-H)(μ-P^tBu₂)₂(μ-dppm)] (3), no bridging carbonyl ligand was found in 2. The electronically unsaturated cluster 2 does not react with carbon monoxide under elevated pressure, therefore 2 seems to be coordinatively saturated by reason of the high steric demands of the phosphido ligands.     

Redox behavior of trinuclear M3(μ-H)(μ3-μ1:μ2:μ2-C2Fe)(Co)9 and tetranuclear RuM3 3(μ-H)(μ4-μ1:μ1:μ1:μ2-C2Fe)(Co)12 (M=Ru or Os; and Fc=ferrocenyl) clusters. Electronic interaction between the ferrocenylacetylide ligand and the metal core of the cluster

The redox properties of the clusters Ru₃(CO)₁₂(1), Ru₃(μ-H)(μ₃-μ¹:μ²:μ²-C₂Fe)(CO)₉ (2), OS₃(μ-H)(μ₃-μ¹:μ²:μ²-C₂Fe)(CO)₉ (3), Ru₄(μ-H)(μ₄-μ¹:μ¹:μ¹:μ²-C₂Fe)(CO)₁₂ (4), and RuOS₃(μ-H)(μ₄-μ¹:μ¹:μ¹:μ²-C₂Fe)(CO)₁₂ (5) in THF have been studied by cyclic voltammetry in the temperature range from ?60 to +20°C. It was demonstrated that reversible one-electron oxidation of the ferrocenyl fragment in clusters 2–5 occurs at more positive potentials (δE ⁰=0.15–0.26 V) than that of free ferrocene. This is indicative of the electron-withdrawing character of the cluster core with respect to the ferrocenylacetylide ligand. The electron-withdrawing effect of the metal core is more pronounced in tetranuclear clusters4 and 5 than in trinuclear clusters2 and3. Unlike complexes1–3, which undergo irreversible reduction, complexes4 and5 undergo reversible one-electron reduction to form the corresponding radical anions4 ^? and5 ^?.     

μ3-O-{[μ-(n-Bu)2Sn(μ-FcCO2)(n-Bu)2Sn]FcCO2}二聚物的晶体结构和分子结构

标题配合物Ｍｒ＝９３３．８４,属单斜晶系,空间群Ｐ２_１／ｎ,晶胞参数ａ＝１５．２４４（４）Ａ,ｂ＝２０．８９５（７）Ａ,ｃ＝１２． ３７５（４）Ａ,β＝９７．３９（３）°,Ｚ＝４,Ｖ＝３９０９（２）Ａ~３,Ｄｃ＝１．５８７９·ｃｍ~（－３）,Ｆ（０００）＝１８７２,最终偏差因子Ｒ＝０．０６８４。该配合物分子呈中心对称,是具有Ｓｎ_２Ｏ_２中心内环的二聚体,Ｓｎ_２Ｏ_２中的每个桥氧原子又各连接一个外环锡而形成了四核分子。分子中四个羧酸酯基有桥联双齿（μ－ＣＯＯ）和单齿两种不同的配位模式;在内环锡和外环锡的配位单元中,锡均形成具有五配位的畸变三角双锥配位构型,同时另有一氧原子与中心锡原子之间有弱相互作用。它与类似物［ＦｃＣＯ_２Ｓｎ（ｎ－ＢＵ）_２］Ｏ｝_２·４Ｃ_６Ｈ_６的晶体结构完全不同,却又存在着内在的联系。     

双簇核铁硫配合物[(μ-RS)Fe2(CO)6]2(μ-S-S-μ)的合成

本文报导由μ-S2F2(CO)6及格氏试剂形成的活泼配合物(1), 可在磺酰氯SO2Cl2的作用下, 发生氧化偶联反应生成由S-S键相连的双簇核配合物(2), 本文对所得配合物(2)的反应性能进行了研究。     

Synthesis of [(μ2-η2-CHCHPh)(μ-S){Fe2(CO)6}2(μ4-S)]− and its reactions with electrophiles

The action of [(μ₂-η²-CHCHPh)(μ-CO)Fe₂(CO)₆]⁻ with (μ-S)₂Fe₂(CO)₆ gives the anionic complex [(μ₂-η²-CHCHPh)(μ-S){Fe₂(CO)₆}₂(μ₄-S)]⁻ (1). The anion 1 reacts with alkyl halides, acid chlorides and Cp(CO)₂FeI to yield neutral products (μ₂-η²-CHCHPh)(μ-RS)[Fe₂(CO)₆]₂(μ₄-S) (R=Me, 2a; Et, 2b; PhCH₂, 2c; PhC(O), 3a; PhCHCHC(O), 3b and Cp(CO)₂Fe, 4).     

Mechanochemical Synthesis of Tri-μ2-Disulfido-μ3-Thio-Tris(Diethyldithiocarbamato)-S,S"-triangular- Trimolybdenum Diethyldithiocarbamate {Mo3(μ3-S)(μ2-S2)3[(C2H5)2NCS2]3}+[(C2H5)2NCS2]–

The mechanoactivated solid-state reaction of [Et₄N]₂[Mo₃S₇Br₆] with Na(Et₂NCS₂) in a vacuum vibration ball mill yields the [Mo₃S₇(Et₂NCS₂)₃]⁺[Et₂NCS₂]^–complex. The product was studied by IR and Raman spectroscopy and differential thermal analysis.     

Hydrothermal synthesis and characterization of LaIII and CuII coordination polymers with 5-nitroisophthalic acid (H2Nip), [La2(μ-Nip)(μ-SO4)2(H2O)5] n and {[Cu3(μ-OH)2(μ-Nip)2(μ-H2O)2] · 2H2O} n

3D La^III and 2D Cu^II coordination polymers with 5-nitroisophthalate anions, [La₂(μ-Nip)(μ-SO₄)₂(H₂O)₅] _n (1) and {[Cu₃(μ-OH)₂(μ-Nip)₂(μ-H₂O)₂] ·?2H₂O} _n (2), have been synthesized, characterized and studied by X-ray crystallography. The La atoms have eight–coordinate geometries in distorted square antiprism environments and the Cu atoms have five- and six–coordinate geometries with distorted square pyramidal and octahedral environments. Self-assembly of these compounds in the solid state occurs through coordination and hydrogen bonding.     

双簇核铁硫配合物[(μ-RS)Fe_2(CO)_6]_2(μ-S-S-μ)的合成

双簇核铁硫配合物的研究已引起人们的兴趣,据文献报道,由μ-S_2Fe_2(CO)_6及格氏试剂形成的活泼配合物(1)可在磺酰氯SO_2Cl_2的作用下发生氧化偶联反应,生成由     

Addition of HCl to a Cluster-Bound Vinylidene Ligand: Preparation and Structure of Ru5(μ3-SMe)(μ3-CMe)(μ-Cl)(μ-SMe)(μ-PPh2)2(CO)9·PhMe

Addition of aqueous HCl to Ru₅( ₃-C=CH₂)(-SMe)₂(-PPh₂)₂(CO)₁₀ afforded the structurally characterized carbyne complex Ru₅( ₃-SMe)( ₃-CMe)(-Cl)(-SMe)(-PPh₂)₂(CO)₉, formed by addition of H to the vinylidene ligand; a Cl atom bridges an Ru–Ru bond.     

双核化合物PdW(μ-Ph_2Ppy)_2(μ-CO)(CO)_2Cl_2·0.7CH_2Cl_2的合成和晶体结构

合成了新型具有Pd—W键的双核化合物PdW(μ-Ph_2Ppy)_2(μ-CO)(CO)_2Cl_2·0.7CH_2Cl_2(Ph_2Ppy为2-二苯基膦基吡啶)。首次测定了具有Pd—W键化合物的晶体及分子结构,该晶体空间群为P2_1/C,晶胞参数:a=14.616(3),b=15.289(1),c=17.676(1),β=97.29(1)°和Z=4。最终R值为0.081。 钯原子为d~9五配位构型,钨原子为d~5七配位构型,两者形式氧化数均为+1。Pd—W键距为2。819(5)。该分子为手性分子,属C_1点群。     

CRYSTAL AND MOLECULAR STRUCTURE OF (μ-SPh) (μ-SCH2CH2CN)Fe_2 (CO)_6

<正> The crystal and molecular structure of (μ-SPh)(μ-SCH2CH2CN)Fe2-(CO)5 has been determined by X-ray diffraction method. The crystals of this complex are triclinic, space group P1,with a=ll.175(1), b=ll.877(2), c= 15.640(2)1,α=106.20(1),β=103.15(1),γ=98.46(1)°; Z=4; Dc=1.67g/cm3. The final structure refinement converged with unweighted and weighted R factors of 0.028 and 0.034 for 2853 observed unique reflections.     

(μ-RS)(μ-XMgS)Fe2(CO)6亲核性能的研究:铁硫配合物(μ-RS)[μ-Cp(CO)2FeS]Fe2(CO)6

研究了(μ-RS)(μ-XMgS)Fe2(CO)6与π-环戊二烯二羰基碘化铁的反应.首次制得(μ-RS)[(μ-CpFe(CO)2S]Fe2(CO)6的一系列含有机铁硫桥的非对称配合物.它们的核磁氢谱表明每个络合物只是以一类构象体存在.它们的甲基络合物的单晶结构分析证实了这一结论.     

关于磁矩公式μ=(n(n 2))~(1/2)μB适用范围的讨论

在无机化学、络合物化学、结构化学教学中常涉及磁矩问题,对此问题常有如下或近似如下的一段叙述:“设原子、离子和分子的未成对电子数为 n,则它们的磁矩μ=n(n 2)~(1/2)μ_(?)式中μ_B 为磁矩单位,称为玻尔磁子”。初学者对此结论甚为满意,因为此公式极其简单,物理意义一目了然,以为由此公式一下子把物质顺磁性的有无及大小问题全部解决。事实上在应用此公式时存在着适用范围的问题。例如我们     

Crystal Structure of catena-[(Tetrakis-μ2-acetato-μ2-4,4'-bipyridine) dicopper(Ⅱ)] Acetonitrile Solvate

The title compound,[Cu2(CH3COO)4(C8H10N2)]n·nCH3CN1 (C8H10N2,4,4'-bipy = 4,4'-bipyridine),has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction.The crystal is of monoclinic,space group Cc with a = 22.626(6),b = 14.012(4),c =15.106(4) (A),β = 107.610(3)°,V = 4565(2) (A)3,C20H23Cu2N3O8,Mr = 560.49,Z = 8,Dc = 1.631 g/cm3,μ = 1.914 mm-1,Flack parameter = 0.48(1),F(000) = 2288,R = 0.042 and wR = 0.)98 for 8887 observed reflections (I ＞ 2σ(I)).It consists of nearly linear one-dimensional chains [Cu2(CH3COO)4(C8H10N2)]n derived from paddle-wheel [Cu2(CH3COO)4] unit linked by 4,4'-bipy,and CH3CN as guest molecule regularly decorates between the chains.     

Di-μ-hydroxo bridge-cleavage reactions between [Co(nta)(μ-OH)]2 2− and different monodentate ligands

The cleavage of the di--hydroxo bridges of [Co(nta)(-OH)]₂ ^2– by dimethylaminopyridine (dmap) and pyridine (py) has been investigated. [Co(nta)(-OH)]₂ ^2– equilibrates rapidly in aqueous basic solutions with a mono--hydroxo bridged Co^III species [pK _OH = 3.26(2)] and both these species react with the incoming ligand to form different ion associated species which react in the subsequent rate-determining steps (k ₁ and k ₂) to form presumably a ligand-substituted, mono-bridged species, [(nta)(OH)Co--OH-Co(nta)(L)]^2–. Values for k ₂, the preferred mono--hydroxo bridged substitution pathway for these reactions, vary between 6.8(2) × 10^–4 s^–1 (py) and 8.5(4) × 10^–2 s^–1 (dmap).     

异双核化合物PdMo(μ-Ph~2Ppy)~2(μ-CO)(CO)~2I~2.0.5CH~2Cl~2的合成和晶体结构

本文合成了新的异双核化合物PdMo(μ-Ph_2Ppy)_2(μ-CO)(CO)_2I_2·0.5CH_2Cl_2,对它进行了表征,并测定其晶体和分子结构。该化合物属PI空间群,d=0.9500(2),b=1.1302(2),c=1.993(1)nm,α=102.82(3),β=101.21(3),‘γ=94.57(2)°,D_x=1.82g/cm~3,Z=2,R=0.064。晶体结构测定表明,该化合物具有Pd—Mo键,键长为0.28596(9)nm。如将Pd—Mo键考虑在内,Pd原子为d~9五配位构型,Mo原子为d~5七配位构型。两者的形式氧化态均为+1。