三环己基羧酸锡的分子结构和晶体结构

用单晶X射线衍射技术测定了三个三环己基羧酸锡化合物—三环己基丁酸锡(1), 三环己基-间氯代苯甲酸锡(2), 三环己基-间溴代苯甲酸锡(3)的分子和晶体结构. 三种化合物均属正交晶系, 空间群分别为P212121(1), Pnaa(2), Pnaa(3). 1的晶胞参数为:a=9.963(2), b=11.004(3), c=20.144(6)埃, Z=4. 2的晶胞参数为: a=8.135(2),b=16.716(3), c=36.426(6)埃, Z=8. 3的昌胞参数为: a=8.165(1), b=16.714(3),c=36.710(4)埃, Z=8. 在1的晶体中, 锡原子呈五配位的三角双锥构型. 桥联的羧基使其结构成为含有两种不同Sn-O键(2.198(4)和2.427(3)埃)的线型聚合物. 2和3的晶体则是由孤立的分子所组成. 在每个分子中, 四配位的锡原子呈畸变的四面体构型, 羧基不能象在化合物1中那样在锡原子之间成桥, 可能主要是由于环己基与卤代苯甲酸根之间的空间位阻效应所致.     

三苄基和三丁基锡4-吡啶甲酸酯聚合物的合成、性质及晶体结构

用三苄基氯化锡及三丁基氯化锡与4-吡啶甲酸钠反应,分别合成了三苄基锡4-吡啶甲酸酯(1)和三丁基锡-4-吡啶甲酸酯(2),并进行了红外光谱、核磁共振氢谱及质谱表征.X射线单晶衍射分析结果表明,化合物1属单斜晶系,P2₁/n空间群,晶胞参数:a=0.96564(8)nm,b=1.64085(14)nm,c=1.49403(13)nm,β=97.681(2)₀,V=2.3460(3)nm₃,Z=4,D_c=1.456g/cm³.化合物2属单斜晶系,P2₁/n空间群,晶胞参数:a=0.96673(14)nm,b=2.3845(4)nm,c=0.97071(14)nm,β=112.463(3)o,V=2.0679(5)nm₃,Z=4,D_c=1.324g/cm³.两个化合物均通过4-吡啶甲酸配体的氮原子桥联,形成五配位三角双锥构型的一维无限链聚合物.     

三烃基锡杂环羧酸酯的合成

合成了十种三烃基锡杂环羧酸酯R~3^1SnO~2C-R^2(R^1=n-C~4H~9, Ph-CH~2; R^2=呋喃, 吡啶, 吲哚烷基), 利用IR, ^1H NMR及元素分析确定了这些化合物的组成和结构。     

三烃基锡杂环羧酸酯的合成

合成了十种三烃基锡杂环羧酸酯R_3~1SnO_2C-R~2(R~1=n-C_4H_9,Ph-CH_2;R~2=呋喃,吡啶,吲哚烷基),利用IR,~1H NMR及元素分析确定了这些化合物的组成和结构。     

三(邻甲苯基)氢化锡与1-乙炔基环戊醇和1-乙炔基环己醇的加成物的合成及晶体结构

通过三(邻甲苯基)氢化锡与1-乙炔基环己醇和1-乙炔基环戊醇发生加成反应,得到两个加成物:(Z)-1-[2-(三-邻甲苯基锡基)乙烯基]环戊醇(1)和(Z)-1-[2-(三-邻甲苯基锡基)乙烯基]环己醇(2).通过元素分析、红外光谱和核磁共振氢谱等手段对其结构进行了表征.用X射线单晶衍射测定了加成物1和2的晶体结构.二者均为具有分子内O→Sn弱配位的扭曲四面体结构.1属于单斜晶系,P21/n空间群,晶胞参数:a=1.0496(2)nm,b=1.7658(4)nm,c=1.3193(3)nm,β=90.60(3)°,V=2.4451(8)nm3,Z=4,R=0.0317,wR=0.0820.2属于三斜晶系,空间群P1,晶胞参数:a=O.85592(17)nm,b=0.93016(19)nm,c=1.6368(3)nm;α=83.76(3)°,β=82.69(3)°,γ=78.05(3)°;V=12600(4)nm3,Z=2,R=0.0377,wR=O.1030.     

三苄基和三丁基锡5-叔丁基呋喃甲酸酯的分子和晶体结构研究

用单晶X射线衍射技术测定了三苄基锡5-叔丁基呋喃甲酸酯(1)和三丁基锡5-叔丁基呋喃甲酸酯(2)的分子和晶体结构。1为三斜晶系P1, 晶胞参数a=1.1253(2),b=1.3138(3), c=1.8920(2)nm, α=89.39(1), β=89.22(1), γ=71.50(2)°, Z=4; 2为单斜晶系P21/n, 晶胞参数a=1.4732(2), b=1.0266(3), c=1.6385(3)nm, β=101.45(1)°, Z=4。两个化合物中Sn原子均分别与5-叔丁基呋喃甲酸的羰基氧配位形成五配位三角双锥构型的线型聚合物。2的Sn-O键长为0.2440(2), 0.2171(6)nm; 与之不同的是1有四种不同的Sn-O键, 其键长分别为0.2462(6), 0.2186(5), 0.2389(5)和0.2204(5)nm, Sn(1)和Sn(2)周围的苄基和呋喃酰基的平面夹角相差很大, 是一类由两个中心锡原子组成一个结构单元的五配位线型聚合的有机锡化合物。     

二{氧合-二[3-二茂铁基丙烯酸二正丁基锡(Ⅳ)]} 配合物的晶体结构及溶液中的 配位互变平衡机理

测定了配合物{[(n-Bu)2Sn(FcCH=CHCO2)]2O}2(Fc=Ferrocenyl)晶体结构,它属三斜晶系,空间群P1,晶胞参数a=1.3943(3)nm,b=1.4635(3)m,c=1.2792(3)nm,α=94.32(3)°,β=116.27(3)°,γ=109.08(3)°,Z=2,V=2.1362(8)nm^3,Dc=1.542g/cm^3,F(000)=1004。最终偏差因子R=0.0401,Rw=0.1076。该分子中存在着内环锡和外环锡配位单元,锡原子均形成具有假六配位的单加帽畸变三角双锥配位构型。Sn2O2中心内环与丙烯酸酯基茂环等共轭体系之间相互未能共平面。配合物中四个羧基配体划分为两类：两个为桥式双齿配位(μ-COO),跨接于一个内环锡和一个外环锡;另两个仅以单齿配位方式各连接一个外环锡。根据核磁共振谱信息表明分子在溶液中存在着配位互变异构体之间的快交换。我们提出振动模式的假说,认为可能是羧酸酯基氧在其平面内快速摇摆建立了动态平衡之故。     

6-(4-取代苯乙烯基)-8-(4-取代苯基)-10,10-二甲基-10H-吡啶并[1,2-a]吲哚盐的合成

通过2,3,3-三甲基-3H-吲哚高氯酸盐与取代双亚苄基丙酮在异戊醇中的反应,合成五种新的6-(4-取代苯乙烯基)-8-(4-取代苯基)-10,10-二甲基-10H-吡啶并[1,2-a]吲哚盐[R=H(3a),Cl(3b),Br(3c),MeO(3d),Me_2N(3e)]。     

三苄基和三丁基锡5-叔丁基呋喃甲酸酯的分子和晶体结构研究

用单晶 X 射线衍射技术测定了三苄基锡5-叔丁基呋喃甲酸酯(1)和三丁基锡5-叔丁基呋喃甲酸酯(2)的分子和晶体结构、1为三斜晶系 PI,晶胞参数 a=1.1253(2),b=1.3138(3),c=1.3920(2)nm,α=89.39(1),β=89.22(1),γ=71.50(2)°,Z=4;2为单斜晶系 P2_1/n,晶胞参数α=1.4732(2),b=1.0266(3),c=1.6385(3)nm,β=101.45(1)°,Z=4.两个化合物中 Sn 原子均分别与5-叔丁基呋喃甲酸的羰基氧配位形成五配位三角双锥构型的线型聚合物.2的 Sn—O 键长为0.2440(2),0.2171(6)nm;与之不同的是1有四种不同的 Sn—O 键,其键长分别为0.2462(6),0.2186(5),0.2389(5)和0.2204(5)nm,Sn(1)和 Sn(2)周围的苄基和呋喃酰基的平面夹角相差很大,是一类由两个中心锡原子组成一个结构单元的五配位线型聚合的有机锡化合物.     

二{氧合-二[3-二茂铁基丙烯酸二正丁基锡(Ⅳ)]} 配合物的晶体结构及溶液中的 配位互变平衡机理

测定了配合物{[(n-Bu)2Sn(FcCH=CHCO2)]2O}2(Fc=Ferrocenyl)晶体结构,它属三斜晶系,空间群P1,晶胞参数a=1.3943(3)nm,b=1.4635(3)m,c=1.2792(3)nm,α=94.32(3)°,β=116.27(3)°,γ=109.08(3)°,Z=2,V=2.1362(8)nm^3,Dc=1.542g/cm^3,F(000)=1004。最终偏差因子R=0.0401,Rw=0.1076。该分子中存在着内环锡和外环锡配位单元,锡原子均形成具有假六配位的单加帽畸变三角双锥配位构型。Sn2O2中心内环与丙烯酸酯基茂环等共轭体系之间相互未能共平面。配合物中四个羧基配体划分为两类：两个为桥式双齿配位(μ-COO),跨接于一个内环锡和一个外环锡;另两个仅以单齿配位方式各连接一个外环锡。根据核磁共振谱信息表明分子在溶液中存在着配位互变异构体之间的快交换。我们提出振动模式的假说,认为可能是羧酸酯基氧在其平面内快速摇摆建立了动态平衡之故。     

Structure, magnetism and optical properties of achiral and chiral two-dimensional oxalate-bridged anionic networks with symmetric and asymmetric ammonium cations

A series of two-dimensional (2D) oxalate-based compounds, namely [N(n-C4H9)4][M(II)Cr(III)(ox)3] (M(II) = Mn, Fe; ox = C2O4(2-)) and [N(C2H5)(n-C3H7)(n-C4H9)(n-C5H11)][M(II)M(III)(ox)(3)] ((M(II), M(III)) =(Mn, Cr), (Fe, Cr), (Mn, Fe)) were synthesised starting from racemic tris(oxalato)metalate: rac-[M(III)(ox)3]3- (M(III) = Cr, Fe). For Cr(III), the synthesis has been undertaken starting from resolved (Delta)- or (Lambda)-[Cr(III)(ox)3]3-. The natural circular dichroism measurements assess the enantioselectivity of the synthesis. X-Ray powder diffraction analysis has revealed that, when racemic reagents are used to synthesise Mn(II) containing compounds, a R3c achiral space group is found. In contrast a P6(3) chiral space group is found when starting from (Delta)- or (Lambda)-[Cr(III)(ox)3]3-. Surprisingly, whatever the optical purity of the starting building block, all Fe(II) containing compounds crystallise in the P6(3) chiral space group. The magnetic properties of the synthesised compounds confirm that these compounds are ferromagnets for M(III)= Cr. For M(II)= Mn, Theta ranges between 9 and 11 K and T(c) equals 6 K. For M(II)= Fe, Theta ranges between 14 and 16 K and Tc between 11 and 12 K. [N(C2H5)(n-C3H7)(n-C4H9)(n-C5H11)][Mn(II)Fe(III)(ox)3] is an antiferromagnet with Theta = - 107 K and T(N) = 29 K.     

Ferrimagnetic Mixed-Valency and Mixed-Metal Tris(oxalato)iron(III) Compounds: Synthesis, Structure, and Magnetism

The synthesis and structural and magnetic characterization of 16 compounds AM(II)Fe(III)(C(2)O(4))(3) (A = N(n-C(3)H(7))(4), N(n-C(4)H(9))(4), N(n-C(5)H(11))(4), P(n-C(4)H(9))(4), P(C(6)H(5))(4), N(n-C(4)H(9))(3)(C(6)H(5)CH(2)), (C(6)H(5))(3)PNP(C(6)H(5))(3), As(C(6)H(5))(4); M(II) = Mn, Fe) are reported. X-ray powder diffraction profiles are indexed in R3c or its subgroup P6(5)22 or P6/mmm to derive unit cell constants. The structures of all the compounds consist of two-dimensional honeycomb networks [M(II)Fe(III)(C(2)O(4))(3)(-)](infinity). The M(II) = Fe compounds behave as ferrimagnets with T(c) between 33 and 48 K, but five exhibit a crossover from positive to negative magnetization near 30 K when cooled in a field of 10 mT. The compounds exhibiting this unusual magnetic behavior are those that have the highest T(c). Within the set N(n-C(n)()H(2)(n)()(+1))(4)Fe(II)Fe(III)(C(2)O(4))(3) (n = 3-5), T(c) increases with interlayer separation and the low-temperature magnetization changes from positive (n = 3) to negative (n = 4, 5). In the M = Mn(II) compounds, the in-plane cell parameter a(0) is approximately 0.03 ? greater than in the corresponding M = Fe(II) ones while the interlayer separation (c(0)/6) is on average 0.08 ? smaller. All members of the M(II) = Mn series have magnetic susceptibilities showing broad maxima at 55 K characteristic of two-dimensional antiferromagnetism, but the magnetization of several of the salts increases sharply below 27 K due to the onset of spin canting, the magnitude of which varies significantly with A.     

Novel superstructure of nondiscoid mesogens: uneven-parallel association of half-disk molecules, 3,4,5-trialkoxybenzoic anhydrides, to a columnar structure and its one-directionally geared interdigitation

Compact and simple nondiscoid mesogens, trialkoxybenzoic anhydrides 2-11 ((RO)(3)C(6)H(2)-CO-O-CO-C(6)H(2)(OR)(3), R = C(2)H(5), n-C(3)H(7), n-C(4)H(9), n-C(6)H(13), n-C(8)H(17), n-C(10)H(21), n-C(12)H(25), n-C(14)H(29), n-C(16)H(33), and (S)- and (R)-3,7-dimethyloctyl) were designed and synthesized, and their superstructures were investigated by polarized light microscopy, differential scanning calorimetry, calculation (MM2 and AM1), circular dichroism spectroscopy, and X-ray diffraction. As the result, in the cases of 5-9 and 11, the half-disk molecules in the liquid crystal phases were self-assembled by the dipole-dipole interaction between their carbonyl groups to a column in which the molecules were piled up in an alternately antiparallel manner, and the columns were interdigitated each other. The observed interdigitations were highly directional in the perpendicular direction to the column axis. In the case of compound 11 which has (S)- or (R)-3,7-dimethyloctyl groups, a helical organization of the molecules in the column was estimated from the peaks in the circular dichroism spectra. This is the first report of a one-directionally interdigitated columnar phase, and these compounds are the first liquid crystalline acid anhydrides. It was demonstrated that a -CO-O-CO- moiety is useful as a polar junction in liquid crystalline compounds.     

Preparation,structures, and redox and emission characteristics of the isothiocyanate complexes of hexarhenium(III) clusters [Re6(mu3-E)8(NCS)6]4- (E = S,Se)

Hexarhenium(III) complexes with terminal isothiocyanate ligands, [(n-C(4)H(9))(4)N](4)[Re(6)(mu(3)-S)(8)(NCS)(6)] (1) and (L)(4)[Re(6)(mu(3)-Se)(8)(NCS)(6)] (L(+) = PPN(+) (2a), (n-C(4)H(9))(4)N(+) (2b)), have been prepared by three different methods. Complex 1 was prepared by the reaction of [(n-C(4)H(9))(4)N](4)[Re(6)(mu(3)-S)(8)Cl(6)] with molten KSCN at 200 degrees C, while 2b was obtained by refluxing the chlorobenzene-DMF (2:1 v/v) solution of [Re(6)(mu(3)-Se)(8)(CH(3)CN)(6)](SbF(6))(2) and [(n-C(4)H(9))(4)N]SCN. The [Re(6)(mu(3)-Se)(8)(NCS)(6)](4)(-) anion was also obtained from a mixture of Cs(2)[Re(6)(mu(3)-Se)(8)Br(4)] and KSCN in C(2)H(5)OH by a mechanochemical activation at room temperature for 20 h and isolated as 2a. The X-ray structures of 1 and 2a.4DMF have been determined (1, C(70)H(144)N(10)S(14)Re(6), monoclinic, space group P2(1)/n (No. 14), a = 14.464(7) A, b = 22.059(6) A, c = 16.642(8) A, beta = 113.62(3) degrees, V = 4864(3) A(3), Z = 2; 2a.4DMF, C(162)H(144)N(14)O(4)P(8)S(6)Se(8)Re(6), triclinic, space group P1 (No. 2), a = 15.263(2) A, b = 16.429(2) A, c = 17.111(3) A, alpha = 84.07(1) degrees, beta = 84.95(1) degrees, gamma = 74.21(1) degrees, V = 4098.3(8) A(3), Z = 1). All the NCS(-) ligands in both complexes are coordinated to the metal center via nitrogen site with the Re-N distances in the range of 2.07-2.13 A. The redox potentials of the reversible Re(III)(6)/Re(III)(5)Re(IV) process in acetonitrile are +0.84 and +0.70 V vs. Ag/AgCl for [Re(6)(mu(3)-S)(8)(NCS)(6)](4)(-) and [Re(6)(mu(3)-Se)(8)(NCS)(6)](4)(-), respectively, which are the most positive among the known hexarhenium complexes with six terminal anionic ligands. The complexes show strong red luminescence with the emission maxima (lambda(max)/nm), lifetimes (tau(em)/micros), and quantum yields (phi(em)) being 745 and 715, 10.4 and 11.8, and 0.091 and 0.15 for 1 and 2b, respectively, in acetonitrile. The data reasonably well fit in the energy-gap plots of other hexarhenium(III) complexes. The temperature dependence of the emission spectra and tau(em) of 1 and [(n-C(4)H(9))(4)N](4)[Re(6)(mu(3)-S)(8)Cl(6)] are also reported.     

Experimental and theoretical study of hydrogen atom abstraction from n-butane by lanthanum oxide cluster anions

Lanthanum oxide cluster anions are prepared by laser ablation and reacted with n-C(4)H(10) in a fast flow reactor. A time-of-flight mass spectrometer is used to detect the cluster distribution before and after the reactions. (La(2)O(3))(m=1-3)OH(-) and La(3)O(7)H(-) are observed as products, which suggests the occurrence of hydrogen atom abstraction reactions: (La(2)O(3))(m=1-3)O(-) + n-C(4)H(10) → (La(2)O(3))(m=1-3)OH(-) + C(4)H(9) and La(3)O(7)(-) + n-C(4)H(10) → La(3)O(7)H(-) + C(4)H(9). Density functional theory (DFT) calculations are performed to study the structures and bonding properties of La(2)O(4)(-), La(3)O(7)(-), and La(4)O(7)(-) clusters. The calculated results show that each of La(2)O(4)(-) and La(4)O(7)(-) contains one oxygen-centered radical (O(-?)) which is responsible for the high reactivity toward n-C(4)H(10). La(3)O(7)(-) contains one oxygen-centered radical (O(-?)) and one superoxide unit (O(2)(-?)), and the O(-?) is responsible for its high reactivity toward n-C(4)H(10). The O(-?) and O(2)(-?) can be considered to be generated by the adsorption of an O(2) molecule onto the singlet La(3)O(5)(-) with electron transfer from a terminally bonded oxygen ion (O(2-)) to the O(2). This may help us understand the mechanism of the formation of O(-?) and O(2)(-?) radicals in lanthanum oxide systems. The reaction mechanisms of La(2)O(4)(-) + n-C(4)H(10) and La(3)O(7)(-) + n-C(4)H(10) are also studied by the DFT calculations, and the calculated results are in good agreement with the experimental observations.     

Synthesis and Structure of the Hexanuclear Diazenido－oxomolybdate ［（n－C_4H_9）_4N］_3［Mo_6O_（18）（N_2C_6H_4－p－NO_2）］

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Low-melting, low-viscous, hydrophobic ionic liquids: aliphatic quaternary ammonium salts with perfluoroalkyltrifluoroborates

A novel class of low-melting, hydrophobic ionic liquids based on relatively small aliphatic quaternary ammonium cations ([R(1)R(2)R(3)NR](+), wherein R(1), R(2), R(3) = CH(3) or C(2)H(5), R = n-C(3)H(7), n-C(4)H(9), CH(2)CH(2)OCH(3)) and perfluoroalkyltrifluoroborate anions ([R(F)BF(3)](-), R(F) = CF(3), C(2)F(5), n-C(3)F(7), n-C(4)F(9)) have been prepared and characterized. The important physicochemical and electrochemical properties of these salts, including melting point, glass transition, viscosity, density, ionic conductivity, thermal and electrochemical stability, have been determined and comparatively studied with those based on the corresponding [BF(4)](-) and [(CF(3)SO(2))(2)N](-) salts. The influence of the structure variation in the quaternary ammonium cation and perfluoroalkyltrifluoroborate ([R(F)BF(3)](-)) anion on the above physicochemical properties is discussed. Most of these salts are liquids at 25 degrees C and exhibit low viscosities (58-210 cP at 25 degrees C) and moderate conductivities (1.1-3.8 mS cm(-1)). The electrochemical windows of these salts are much larger than those of the corresponding 1,3-dialkyimidazolium salts. Additionally, a number of [R(F)BF(3)](-) salts exhibit plastic crystal behavior.     

Synthesis and structural characterization of a new series of vanadoselenites, [Se(x)V(4-x)O(12-x)](4-x)- (x=1,2)

Two new vanadoselenites, [SeV(3)O(11)](3)(-) and [Se(2)V(2)O(10)](2)(-), were synthesized by reacting SeO(2) with VO(3)(-). Single-crystal X-ray structural analyses of [(n-C(4)H(9))(4)N](3)[SeV(3)O(11)].0.5H(2)O [orthorhombic, space group P2(1)2(1)2, a = 22.328(5) A, b = 44.099(9) A, c = 12.287(3) A, Z = 8] and [[(C(6)H(5))(3)P](2)N](2)[Se(2)V(2)O(10)] [monoclinic, space group P2(1)/n, a = 12.2931(3) A, b = 13.5101(3) A, c = 20.9793(5) A, beta = 106.307(1) degrees, Z = 2] revealed that both anions are composed of Se(x)()V(4)(-)(x)()O(4) rings. The (51)V, (77)Se, and (17)O NMR spectra established that both [SeV(3)O(11)](3)(-) and [Se(2)V(2)O(10)](2)(-) anions maintain this ring structure in solution.     

Hydroxoundecahydro-closo-dodecaborate(2-) as a Nucleophile. Preparation and Structural Characterization of O-Alkyl and O-Acyl Derivatives of Hydroxoundecahydro-closo-dodecaborate(2-)

The syntheses, solid state structures, and spectral properties of O-alkyl and O-acyl derivatives of hydroxoundecahydro-closo-dodecaborate(2-), 1, are described. Alkylation of 1 with ethyl iodide was achieved in dimethyl sulfoxide using potassium hydroxide as a base, leading to [N(n-C(4)H(9))(4)](2)[CH(3)CH(2)O-B(12)H(11)(2-)], 2, bis(tetrabutylammonium) ethoxyundecahydro-closo-dodecaborate(2-) [monoclinic P2(1)/n, a = 1192.4(9) pm, b = 1253.9(4) pm, c = 3049.1(10) pm, beta = 92.69(4) degrees, Z = 4, R1 = 0.0693, wR(2) = 0.1517]. Alkylation with 1,5-dibromopentane afforded the cyclic oxonium salt [PPN][C(5)H(10)O-B(12)H(11)(1-)], 3, (&mgr;-nitrido)bis(triphenylphosphorus)(1+) tetrahydropyrane-undecahydro-closo-dodecaborate(1-) [monoclinic P2(1)/c, a = 1938.1(2) pm, b = 1329.7(10) pm, c = 1944.0(2) pm, beta = 108.82(10) degrees, Z = 4, R1 = 0.0484, wR(2) = 0.0833]. Acylation of 1 in acetonitrile with acyl chlorides in the presence of pyridine yielded [N(n-C(4)H(9))(4)](2)[C(6)H(5)CO(2)-B(12)H(11)(2-)], 4, bis(tetrabutylammonium) undecahydrobenzoyl-closo-dodecaborate(2-) [monoclinic P2(1)/c, a = 1812.0(4) pm, b = 1711.9(3) pm, c = 1685.0(3) pm, beta = 114.03(3) degrees, Z = 4, R1 = 0.0915, wR(2) = 0.2093], and [N(n-C(4)H(9))(4)](2)[CH(3)CO(2)-B(12)H(11)(2-)], 5, bis(tetrabutylammonium) acetoxyundecahydro-closo-dodecaborate(2-) [monoclinic P2(1)/n, a = 1190.5(2) pm, b = 1243.0(10) pm, c = 3078.4(4) pm, beta = 92.76(10) degrees, Z = 4, R1 = 0.0642, wR(2) = 0.1462]. All crystal structures showed distortion of the pseudoicosahedral geometry of the boron cluster. The boron-oxygen distances varied from 144.2(5) pm for 2, 148.5(3) pm for 5, 149.4(12) pm for 4, to 152.8(4) pm for 3. The 3-fold coordinated oxygen of oxonium salt 3 is nearly planar.     

3-(P-氨基-P-乙氧基酰基)丙酸甲酯类化合物的合成

本文合成了两个未知氯代膦酰基丙酸甲酯和十四个新化合物,初步测定了这些化合物部分样品的生物活性。