四核钼亚硝基双硫配合物Na2[Mo4O(S2)6(NO)4].3H2O的合成和晶体结构

本文报道了四核钼亚硝基双硫配合物——Na_2[MO_4O(S_2)_6(NO)_4]·3H_2O的合成和晶体结构。该晶体属单斜晶系;空间群Ic;晶胞参数a=10.322(2),b=22.945(6),c=10.312(2)A,β=90.02(1)°;Z=4;D~c=2.731g·cm~(-3)。在CAD4四圆衍射仪上录谱,其中I≥3σ(I)的独立衍射点为2258个。晶体结构采用直接法解出,并用全矩阵最小二乘法修正,最终偏离因子R为0.053。研究结果表明,阴离子是以四配位氧为中心的四核钼硫配合物,氧原子处在四个钼组成的稍为扭曲的四面体中心。每对Mo原子均由S_2配位基端接或侧接桥联。Mo(IV)原子配位为扭曲的五角双锥,其中线性亚硝基NO基团及桥基氧原子处在五角双锥轴线上,五个硫原子在五角双锥赤道面上,阴离子构型接近S_4对称性。     

钼簇合物反应性能的研究: {Mo3S4[S2P(OEt)2]4H2O}的加硫反应以及产物{Mo3(μ3-S)(μ-S2)3[S2P(OEt2]3I}的晶体结构

由贫硫化合物{Mo_3S_4[S_2P(OEt)_2]_4·H_2O}通过加硫获得了富硫化合物{Mo_3S_7[S_2P(OEt)_2]_3·I}(CH_8C_6H_5).化合物属三斜晶系,空间群PI,晶胞参数为a=10.350(1)A,b=13.931(4)A,c=16.369(3)A,α=103.69(2),β=86.62(1),γ=111.99(2)°,V=2183A~3;z=2,D_c=1.817g·cm~(-3).最终结构偏离因子R为0.042. 簇分子{Mo_3(μ_3-S)(μ-S_2)_3[S_2P(OEt)_2]3·I}属{Mo_3(μ3一Y)(μ-S_2)_3[S_2P(OEt)_2]_3·X}(Y=O,S;X=Cl,I)系列构型.{Mo_3}基本上是一个正三角形,Mo—Mo键长分别为2.721(1),2.724(1),2.725(1)A,Mo的配位多面体为七个硫原子组成的畸变五角双锥,有一个I原子联结着三个(S_2)~(2-)桥基的三个不与Mo共平面的S原子,I—S距离平均为3.169A,比相应的Van der Waals距离(～4.00A)明显地短,显示一定程度的成键作用,簇分子的这一构型是一种较为稳定的结构类型.     

钼的原子簇化合物研究——一些两核和三核钼原子簇化合物的合成与晶体结构分析

本文总结了作者们研究一系列两核和三核钼原子簇化合物的结果。这些化合物是三核原子簇: (C_5H_7S_2)_3[Mo_3(μ_3-S)_2(μ_2-Cl)_3Cl_6] (Ⅰ); (C_5H_7S_2)_3[Mo_3(μ_3-S)(μ_2-S_2)_3Cl_7] (Ⅱ); Mo_3(μ_3-S)(μ_2-S_2)_3[S_2P(OEt)_2)_3Cl (Ⅲ); (Et_4N)_2[Mo_3(μ_3-O)(μ_2-Cl)_3(Oac)_2Cl_5] (Ⅳ); (C_5H_7S_2)[Mo_3(μ_3-O)(μ_2-Cl)_3(Oac)_3Cl_3] (Ⅴ); 和两核原子簇: (C_5H_7S_2)_3[Mo_2Cl_9] (Ⅵ); M0_2S_4[S_2P(OEt)_2]_2 (Ⅶ)。 本文的第一部分简要地介绍了这些化合物的合成方法。第二部分扼要地给出了这些化合物的晶体与分子结构。簇合物Ⅰ是离子型结构,簇阴离子是双(S)帽三核原子簇,每个Mo原子周围为八面体六配位,Mo—Mo间距为2.617。簇阴离子Ⅱ和簇分子Ⅲ均是单(S)帽三核簇,Mo原子周围为畸变五角双锥构型,Mo—Mo键长分别为2.751和2.725。簇阴离子Ⅳ和Ⅴ均是单(O)帽三核簇,Mo原子周围的配位为畸变八面体,Mo—Mo键长分别为2.597和2.577。化合物Ⅵ是三(μ_2—Cl)桥两核原子簇,其构型为两个共面八面体,Mo—Mo间距为2.707。化合物Ⅶ为双(S)桥两核原子簇,Mo原子周围为四角锥配位,Mo—Mo键长为2.828。 本文的第三部分用简化分子轨道方法分析了三种主要类型的三核钼原子簇中Mo_3体系的M—M键?     

新型氧桥和多硫基杂桥联的双核钼硫亚硝基化合物〔(CH_3)_4N〕_2K〔Mo_2OS_2(NO)_2(S_2)_2S_5)·H_2O的合成和晶体结构

本文报导[(CH_3)_4N]_2K[Mo_2OS_2(NO)_2(S_2)S_5]·H_2O的合成和晶体结构。该化合物晶体属于单斜晶系,所属的空间群为P2_1/c。晶胞参数为:a=13.320(2),b=17.377(2),c=13.269(3),β=107.93(2)°,Z=4。在CAD—4四圆衍射仪上,用MoKα射线收录了3576个独立衍射数据(I≥3σ(I))。晶体结构用直接法解出,经Fourier合成和全矩阵最小二乘方修正,最后偏离因子R=0.045。结构分析表明,晶体中Mo—Mo间距为3.421,二钼原子间未成键。Mo原子周围呈近似五角双锥的七配位构型。本结构的特征在于二Mo原子间除双硫桥外还存在氧桥。     

钼硫原子簇新化合物(NH_4)_4[Mo_3(NO)_4S_(13)]·3H_2O的合成和结构

本文合成了钼硫原子簇新化合物(NH_4)_4[Mo_3(NO)_4S_(13)]·3H_2O,并用X射线单晶衍射法测定了晶体结构.晶体属三斜晶系,空间群C_i~1—P_1~-,晶胞参数:a=9.535(2)A,b=9.740(2)A,C=15.795(4)A,a=89.85(2)°,β=91.80(2)°,r=99.37(1)°,V=1446.6A~3,Z=2.1903个衍射点参与修正,最终偏差因子R=0.075,R_ω=0.074.此化合物中硫和钼的结合状态是多种多样的.中心两个硫原子分别和三个钼成键,构成三角双锥.除了过硫配位基S_2~(-2)外,还有三个硫原子组成的多硫链.钼原子的配位数为7,采用稍有畸变的五角双锥构型.和钼配位的三个NO基,Mo—N—O是直线型的;和多硫链结合的NO基,S—N—O是弯曲型的。     

含氧桥的笼状化合物[Mo_5P_2O_(23)]~(6-)[(CH_3)_2NH_2]_5~(5+)-[H_3O]~+·1/2(CH_3)_2NCHo·1/2H_2O的合成和结构

[Mo_5P_2O_(23)]~(6-)[(CH_3)_2NH_2]_5~(5+)[H_3O]~+·1/2DMF·1/2H_2O(DMF=(CH_3)_2NC-HO)(M_r=1204.67)的晶体属三斜晶系,空间群P,晶胞参数a=16.438(6);b=22.22(1);c=11.325(5),α=104.25(4);β=108.97(3);γ=97.68(4)°,V=3688(3),Z=4,D_c=2.17gcm~(-1),R=0.056,R_w=0.074,晶胞中每个不对称单元含有两个[Mo_5P_2O_(23)]~(6-)[(CH_3)_2NH_2]_5~(5+)[H_3O]~+·1/2DMF·1/2H_2O,阴离子[Mo_5P_2O_(23)]~(6-)中的Mo、P原子成一个畸变五角双锥构型。有一个阴离子的所有原子(Mo、P、O)位置完全确定,而另一个阴离子有一个磷酸根的三个氧原子位置出现二重位置统计分布。化合物的阳离子为二甲胺阳离子和水合氢离子。     

[(CH_3)_4N]_2[Mo_2S_8O_2]的合成与晶体结构

S~(2-)作为配位方式多变的配位基,已为人们所知,而以S_4~(2-)为配位基的钼化合物,现在还为数不多。我们合成的[Mo_2S_8O_2]~(2-)不仅含有S_2~(2-)、S_4~(2-)基,还含有端基氧,其结构是很有趣的。混合(NH_4)_6Mo_7O_(24)·4H_2O和NH_2OH·HCl的水溶液,与K_2S反应后,用(CH_3)_4NBr沉淀,产物再用丙酮和DMF混合液重结晶,得[(CH_3)_4N]_2[Mo_2S_8O_2]的极薄的橙色片状晶体。其元素组成是:Mo 30.7,S40.5,C15.6,N4.3,H4.0(％);计算值为:Mo30.4,S40.8,C15.3,N4.6,H3.9(％)。     

三核钼原子簇化合物研究——(C_5H_7S_2)_3[Mo_3(μ_3—S)(μ_2—S_2)_3Cl_7]的晶体与分子结构

(C_5H_7S_2)_3[Mo_3(μ_3-S)(μ_2-S_2)_3Cl_7]晶体的空间群为Pnam;晶胞参数:a=17.226(4),b=14.306(7),c=15.074(4);z=4,ρ_(obs)=2.03克/厘米~(-3),ρ_(calc)=2.063克/厘米~(-3)。晶体结构由重原子法解出,并经全矩阵最小二乘方精修,偏离因子R值为0.068。研究结果显示出,晶体结构由三核钼簇阴离子[Mo_3(μ_3-S)×(μ_2-S_2 )_3Cl_7]~(3-)以及环绕着它的平面状的阳离子(C_5H_7S_2)~ 所组成。簇阴离子中,三个处在等边三角形顶点的Mo原子,由一个μ_3—S原子将其联系在一起,同时,每两个Mo原子之间还由一个S_2基团桥联,Mo—Mo间距分别为2.755(1),2.755(1),2.743(1)。此外,每个Mo原子还由两个Cl原子配位,使得Mo原子近邻的所有配位原子一起,形成接近五角双锥构型。簇阴离子中还有一个不与Mo原子直接配位的Cl原子,处在三个μ_2—S_2基团之间,而且与这三个S_2的一端S原子有一定程度的成键。簇阴离子整体接近c_(3v)对称性。用Cottonm~([1])等简化量化方法定性地分析了{Mo_3}体系的M—M成键情况,满意地解释了Mo—Mo间距和分子的磁性。     

[(CH_3)_4N]_2Na[Mo_2O(S_2)_3S_5]·H_2O的合成和晶体结构

标题晶体属斜方晶系,空间群Pbn2_1,a=9.086(2),b=13.439(3),c=22.858(11),V=2791,Z=4,Dc=1.927g/cm~3。在CAD—4衍射仪上收集强度数据,采用直接法和Fourier技术解出结构,并用全矩降最小二乘法修正。对于1180个独立衍射最终偏离因子0.067。结构中的阴离子与其同系物[(CH_3)_4-N]_2K(Mo_2O(S_2)_3(NO)_2]·H_2O中的阴离子配位情况相似。只是结构中的Mo—S与Mo—O键长有差异。这种差异在两者的红外光谱上有着相应的表现。     

“松散”配位的三核钼簇化合物——Mo_3(μ_3-X)(μ-S)_3[S_2P(OEt)_2]_4·L(X=O,S或[(1/2)O+(1/2)S];L=H_2O,SC(NH_2)_2)

文献报道的三钼簇合物大多是配位对称的,而配位不对称的(包括配位空缺或称为配位不饱和的)在化学上更有意义,但报道甚少。最近我们合成了“松散”配位的三核钼簇合物若干个,其中簇合物{Mo_3(μ_3-S)(μ-S)_3[S_2P·(OEt)_2]_4(H_2O)}(1)和{Mo_3(μ_3-X)(μ-S)_3[S_2P·(OEt)_2]_4·SC(NH_2)_2}(2 X=1/2O+1/2S),已用X射线衍射法测定了晶体结构,发现不对称配位的Mo—L键较通常的长,显得“松散”,配基L可以被其他π-型中性配基置换,在化学上     

COMPLEX SALTS [Pd(NH3)4][Pd(NH3)3NO2] [CrOx3]·H2O AND [Pd(NH3)4][Pd(NH3)3NO2] [CoOx3]·H2O AND SOLID SOLUTIONS [Pd(NH3)4] [Pd(NH3)3NO2][CoOx3]x[RhOx3]1–x·H2O : PROMISING PRECURSORS FOR POROUS NANOALLOYS

Journal of Structural Chemistry - New complex salts [Pd(NH3)4][Pd(NH3)3NO2][CrOx3]·H2O I, [Pd(NH3)4][Pd(NH3)3NO2][CoOx3]·H2O II, and a series of solid solutions...     

Experimental and theoretical study of~(13)C shielding tensors in new-style molybdenum complex

~~Experimental and theoretical study of~(13)C shielding tensors in new-style molybdenum complex~~     

过渡金属二取代三元杂多酸盐的制备和表征

在水中由Na2 WO4 ·2H2 O ,Na2 MoO4 ·2H2 O和KH2 PO4 ·2H2 O反应生成具有半Dawson结构的钨钼混配杂多阴离子Na9PW6Mo3O34 ·1 0H2 O。以阴离子和过渡金属硝酸盐为原料在水溶液中合成了一系列过渡金属二取代的具有Keggin结构的杂多酸四丁基铵盐 [TBA]4 Hn[PW7Mo3M2 O38(H2 O) 2 ]·C3H6O(n =1 ,M =Fe3+;n =3,M =Mn2 +,Co2 +,Ni2 +,Cu2 +) ,用元素分析和波谱进行了表征。     

Synthesis and Crystal Structure of Neodymium Heteropolymolybdate Complex Na_4(NH_4)_(10)[Nd_4 Mo_(29)O_(100)(H_2O)_(16)]·34H_2O

1INTRODUCT1ONThestudyofheteropolycomplexeshasbeenstartedmorethanonehundredyearsago.lnthepasttwentyyearstheheteropoly-coinplexesoftungstenandmolyb-denumhavebeenusedinpreparingcatalystfield,biologicalandionexchangemateri-als.Sothesecomplexeshavebeendeeplystudiedandexaminedbynewtechnicalmethodst2~7J.Wehavereportedthesynthesismethodandcrystalstructureoflanthanideele-mentneodymiumheteropolymolybdate(NH4),2H,,tNd'Mo,,O,,,(H,O)1,j.22H,O('i.Inthispaperwereportthesynthesismethodandcrystalstruc…     

N-对R苯基氮杂15冠5八钼多酸钠超分子配合物的合成与结构

为研究大环化合物对客体分子的选择性, 合成了通式为[NaL(Et2O)]2Na2Mo8O26的三种新型N-对R苯基氮杂15冠5八钼多酸钠超分子配合物(其中L分别为: N-苯基氮杂15冠5、N-对氯苯基氮杂15冠5和N-对甲苯基氮杂15冠5), 进行了元素分析, 红外光谱与核磁共振等结构参数的表征, 对R基为CH3的标题配合物作了X射线四圆衍射测定, 该晶体属单斜晶系, 空间群为P21/a,a=1.4590(4)nm, b=1.3817(3)nm, c=1.7639(5)nm, β=112.67(2)°, V=3.281(1)nm^3, Mr=2021.3, Dc=2.11g/cm^3,μ=2.37mm^-^1, F(000)=2048, R=0.045和Rw=0.057, 与[Na.(DB18C6)(CH3OH)M6O19和[Na(DB24C8)]2M6O19进行比较,结果表明: 大环化合物不仅对客体金属离子有分子识别性, 而且对与之抗衡的多酸阴离子也具有影响。     

Metal-metal charge transfer and solvatochromism in cyanomanganese carbonyl complexes of ruthenium and osmium

The complexes [(H3N)5Ru(II)(mu-NC)Mn(I)Lx]2+, prepared from [Ru(OH2)(NH3)5]2+ and [Mn(CN)L(x)] {L(x) = trans-(CO)2{P(OPh)3}(dppm); cis-(CO)2(PR3)(dppm), R = OEt or OPh; (PR3)(NO)(eta-C5H4Me), R = Ph or OPh}, undergo two sequential one-electron oxidations, the first at the ruthenium centre to give [(H3N)5Ru(III)(mu-NC)Mn(I)Lx]3+; the osmium(III) analogues [(H3N)5Os(III)(mu-NC)Mn(I)Lx]3+ were prepared directly from [Os(NH3)5(O3SCF3)]2+ and [Mn(CN)Lx]. Cyclic voltammetry and electronic spectroscopy show that the strong solvatochromism of the trications depends on the hydrogen-bond accepting properties of the solvent. Extensive hydrogen bonding is also observed in the crystal structures of [(H3N)5Ru(III)(mu-NC)Mn(I)(PPh3)(NO)(eta-C5H4Me)][PF6]3.2Me2CO.1.5Et2O, [(H3N)5Ru(III)(mu-NC)Mn(I)(CO)(dppm)2-trans][PF6]3.5Me2CO and [(H3N)5Ru(III)(mu-NC)Mn(I)(CO)2{P(OEt)3}(dppm)-trans][PF6]3.4Me2CO, between the amine groups (the H-bond donors) at the Ru(III) site and the oxygen atoms of solvent molecules or the fluorine atoms of the [PF6]- counterions (the H-bond acceptors).     

CRYSTAL AND MOLECULAR STRUCTURE OF GUANIDINIUM BIS (o-AMINOPHENYLARSENIC) HEXAMOLYBDATE (CN_3H_6)_4[(o NH_2C_6H_4 As)_2Mo_6O_(24)]

<正> Guanidinium bis (o - aminophenylarsenic) hexamolybdate belongs to monoclinic space group P21/c,with a=10. 217(2),b= 18. 870(2),c= 10. 939(2)A,β = 102. 82(3)°,Z = 2,V=2056. 4A3,and Dc=2. 477 g·cm-3. Each molecule contains one [(o-NH2C6H4As)2Mo6O24]4- anion and four CN3H6+ cations. In the anion,six distorted MoO6 octahedra are connected with edges-sharing to form a six-membered Mo ring which is capped above and below by two o - aminophenylarsenic groups. There is half a molecule in an asymmetric unit. It is interesting that both phenyl planes are almost perpendicular to the plane of the Mo atoms. The structure of the anion is similar to that of [ (CH3 As)2Mo6O24]4-,[(n-C3H7As)2Mo6O24]4- or [(C6H5CH2As)2Mo6O24]4-. This is the first example of this type of compounds in which the As atom is directly connected to a substituted phenyl group.     

Photoreductive self-assembly from [Mo7O24]6- to carboxylates-coordinated {Mo142} Mo-blue nanoring in the presence of carboxylic acids

The primary steps of the photoredox reaction between [Mo7O24]6- and carboxylic acid electron (and proton) donors in aqueous solutions are investigated by the chemically induced dynamic electron spin polarization (CIDEP) spectroscopy. The excitation of the O-->Mo ligand-to-metal charge-transfer (LMCT) bands of [Mo7O24]6- in the presence of CH3CO2H induces the emissive electron spin polarization (ESP) of *CH2CO2 and *CH3 radicals with an accompanying formation of the one-electron reduced species [Mo7O23(OH)]6-, which is demonstrated by the triplet mechanism involving the O --> Mo LMCT triplet states. The prolonged photolysis of the solution containing [Mo7O24]6- and CH3CO2H at pH = 3.4 leads to the formation of the acetate/propionate-coordinated {Mo142} Mo-blue nanoring, [MoV28MoV(I)114O429H10(H2O)(49)(CH3)CO2 triple bond Ac5(C2H5CO2 triple bond Pr)]30- (1a) through the formation of the cis-configured dimeric dehydrative condensation to two-electron reduced Mo-blue [(Mo7O23)2]10- ({Mo14}). 1a is isolated as a [NH4]+/[Me3NH]+-mixed salt which is formulated as [NH4]27[Me3NH]3[Mo(V)28Mo(VI)114O429H10(H2O)49(CH3CO2)5(C2H5CO2)].150 +/- 10H2O (1) by results of elementary analysis, single-crystal X-ray analysis, 1H NMR, IR, and UV/Vis measurements, and manganometric redox titration. Based on the building-block sequence of for 1a, the bottom-up processes from [Mo7O24]6- to the {Mo142} ring in the coexistence of beta-[Mo8O26]4- are discussed by (i) the stabilization of the molecular curvature of {Mo14} through both the intramolecular transfer of monomolybdates and the intermolecular transfer of monomolybdates as degradation fragments of beta-[Mo8O26]4-, to yield {Mo21} and {Mo20} building blocks, (ii) the outer-ring formation resulting from seven successive two-electron-photoreductive condensations among {Mo21} and {Mo20}, and (iii) inner-ring formation resulting from eight successive dehydrative condensations between monomolybdate linkers attached to the neighboring head Mo sites.