稀土元素异硫氰酸盐水合物的低温热容和热力学性质研究——Ⅲ.Sm(NCS)_3·6H_2O,Gd(NCS)_3·6H_2O,Yb(NCS)_3·6H_2O和Y(NCS)_3·6H_2O

用全自动绝热量热计测定了4种稀土异硫氰酸盐六水合物,Sm(NCS)_3·6H_2O,Gd(NCS)_3·6H_2O,Yb(NCS)_3·6H_2O和Y(NCS)_3·6H_2O在13～300 K间的热容,在实验温区上述化合物均未发现反常热容.根据实验热容数据用最小二乘拟合方法得出了计算这4种化合物在13～300 K温区内的热容多项式方程.13K以下的热容用 Debye-Einstein热容函数估算而得.计算了这些化合物在0～300 K间的标准热力学函数及其标准生成Gibbs能.     

固相配位化学反应研究——ⅩⅩⅩⅩⅠ.[Co(NH_3)_5(H_2O)]Br_3,[Cr(NH_3)_5(H_2O)](NO_3)_3与无机盐KY(Y=Cl,Br,Ⅰ)的固相反应动力学研究

本文主要用气相色谱逸出气体分析方法,借助于红外、紫外可见漫反射谱等手段研究了[Co(NH_3)_5(H_2O)]Br_3、[Cr(NH_3)_5(H_2O)](NO_3)_3与无机盐KY(Y=Cl,Br,Ⅰ)的固相反应,计算了失水与失氨的动力学参数,发现第一步反应失水生成一取代中间产物,其活化能与外加阴离子无关,为S_N1过程。第二步失氨反应活化能与中心离子M以及取代基Y有关,当M=Co(Ⅲ)时,反应体系的失氨活化能大小有下列顺序:Cl>Br>Ⅰ(E值分别为187、155、98kJ·mol~(-1)),M=Cr(Ⅲ)时则正好相反:Ⅰ>Br>Cl(E值分别为213、146、79 kJ·mol~(-1))。     

C28H4-nCln(n=1~3)与CH4-nCln(n=1~3)的结构和电子光谱的理论研究

用INDO系列方法对C_(28)H_3Cl,C_(28)H_2Cl_2,C_(28)HCl_3,CH_3Cl,CH_2Cl_2,CHCl_3进行了几何构型优化,Q_(28)H_3Cl,Q_(28)HCl_3,CH_3Cl,CH_3Cl为C_3_v对称性,C_(28)H_2Cl_2,CH_2Cl_2为C_2.对称性,这六个分子的基态都是稳定闭壳层分子,以此构型为基础计算了上述分子的电子光谱,Q_(28)H4-nCl_n(n=1～3)的电子光谱属于理论预测性质.     

四钼簇合物Mo_4(μ_3—O)_2O_4Cl_2(OCOC_6H_5)_6和[Mo_4(μ_3—O)_2O_4Cl_2(OCOC_6H_4CH_3)_6]·2C_6H_5Cl的合成、结构、反应机理及光谱性质研究

用MoCl_5和C_ 6H_5COOH(或CH_3C6H_4COOH)在氯苯溶液中反应,得到四钼簇合物Mo_4(μ_3-O)_2O_4Cl_2-(OCOC_6H_5)_6(或[Mo_4(μ_3-O)_2O_4Cl_2(OCOC_6H_4CH_3)_6]·2C_6H_5Cl)晶体。用X射线单晶衍射法测定了簇合物的晶体结构,运用18电子规则及簇合物的晶体结构数据,得到金属Mo-Mo键键价为1,钼在簇合物中均呈+5价。进行了反应机理的探讨,簇合物中端基氧和桥基氧的存在来自于苯甲酸(对甲基苯甲酸),MoCl_5和C_6H_5COOH(CH_3C_6H_4COOH)作用时,首先生成钼的含氧配合物MoOCl_3,然后生成双核钼配合物Mo_2(μ_2-O)_2O_2Cl_2,进一步形成配合物。红外光谱、激光拉曼光谱和磁化率的测定证明了结构分析的结果。值得注意的是,固体表面光电压谱和固体光声光谱的测定,簇合物Mo_4(μ_3-O)_2O_4Cl_2(OCOC_6H_5)_6的表面光电压谱在～600nm处有一光致电荷分离谱带。     

Er(PMAP)_3·2H_2O的合成及其晶体结构和分子结构

Er(PMAP)_9·2H_2O(PMAP=1-苯基-3-甲基-4-乙酰吡咯啉酮-5)属单斜晶系。空间群为P2_1/c,晶胞参数α=17,582(4),b=12.346(2),c=18.236(3),β=102.8(2)°,Z=4,R=0.06298。     

含弱金属-金属键体系[M_2(η~5-C_5H_5)_2(CO)_4](M=Fe,Ru)及其相关体系的电子光谱

用INDO/CI法研究了[M_2(η~5-C_5H_5)_2(CO)_4]及M(η~5-C_5H_5)(CO)_2Cl(M=Fe,Ru)体系的电子光谱,讨论了谱带的跃迁机理、电荷转移性质及同一标号谱带的蓝移现象,并对[MC_p(CO)_2]_2体系的异构化反应性及光化学反应的可能机理进行了探讨。     

[C_5H_5Fe(CO)_2]LnCl_2·nTHF和[C_5H_5Fe(CO)_2][C_5H_4(SiMe_3)]LnCl·nTHF双核配合物的合成

合成了稀土铁双核配合物:〔C_5H_5Fe(CO)_2〕LnCl_2·nTHF(Ln=Nd,Sm,Gd;n=1,2)和〔C_5H_5Fe(CO)_2〕〔C_5H_4(SiMe_3)〕·LnCl·nTHF(Ln=Nd,Sm,Gd;n=0,1,2)。元素分析,热分析,红外光谱和质谱分析确认了这两种配合物。红外光谱数据表明铁与稀土原子是以羰基桥连接。晶体结构分析表明〔(C_5H_5Fe(CO)_2〕Na·4THF是〔C_5H_5Fe(CO)_2〕LnCl_2·nTHF合成的中间体。     

金属簇合物η~5-RC_5H_4(CO)_2MCo_3(CO)_6(μ-CO)_3的合成、结构及反应机理的研究

通过金属单键化合物[η~5-RC_5H_4(CO)_3M]_2和CO_2(CO)_8的热反应,制得8个含烷基环戊二烯基配体的金属四面体簇合物η~5-RC_5H_4(CO)_2MCo_3(CO)_6(μ-CO)3(M=Mo,W;R=CH_3,C_2H_5,n-C_4H_9,C_6H_5CH_2)。除用元素分析,IR,~1H NMR和MS表征了它们的结构以及用X光衍射技术测得η~5-n-C_4H_9C_5H_4(CO)_2MoCo_3(CO)_6(μ-CO)_3的单晶分子结构外,尚对该反应的机理进行了研究。所测晶体属空间群P2_1/c,晶胞参数a=10.088 (2),b=13.063 (3),c=18.320 (5) A;β=96.04 (2)°,最终偏差因子R=0.041。     

混合簇合物(G_5H_5FeC_5H_4C_2Ph)Co_2(CO)_6的结构研究

本文用电化学方法和X射线单晶结构分析,研究了混合簇合物(C_5H_5FeC_5H_4C_2Ph)Co_2(CO)_6的结构。由循环伏安结果,分别讨论了簇合物中C_5H_5FeC_5H_4和C_2Co_2中心的成键性质,X射线单晶结构分析表明:晶体属单斜晶系,空间群为P2_1,晶胞参数a=11.845(6),b=8.155(6),c=24.031(6) ,β=90.88°,晶胞中分子数Z=4,密度D_0=1.637g·cm~(-3),分析了(C_5H_5FeC_5H_4C_2Ph)Co_2·(CO)_6的结构特点,并从成键角度讨论了(RC_2R~1)Co_2(CO)_6类簇合物的结构随RC_2R~1不同而变化的规律。     

中性配合物Cr(acac)_3、mer-和fac-[Cr(bza)_3]的光学拆分

本文用新方法合成了Cr(bza)_3,改进了其mer-、fac-异构体的分离方法;增大了Cr(acac)_3的化学拆分量(1.5g)。试制了DBT(二苯甲酰-d-酒石酸)吸附型手性固定相(CSP),并成功地用于色谱拆分标题配合物的对映体,mer-[Cr(bza)_3]的部分拆分是首次发现的,其他配合物的拆分结果均优于文献方法。根据mer-[Cr(bza)_3)拆分流出液前、后组分的CD光谱,指定了其对映体绝对构型。还讨论了DBT吸附型CSP的拆分效能和色谱特性。     

（C_5H_7S_2）_3〔Bi_2Cl_9〕的合成和晶体结构

标题化合物由ＢｉＣｌ３和乙酰丙酮在ＨＣＩ（气）／Ｃ２Ｈ５ＯＨ溶剂中通入Ｈ２Ｓ气体反应而得。晶体属四方晶系，Ｍｒ＝１１３０．７６，空间群Ｐ４１２１２。晶胞参数ａ＝ｂ＝８．８６７（２），ｃ＝４１．５１１（４）Ａ；Ｖ＝３２６４（１）Ａ３，Ｚ＝４，Ｄｃ＝２．３０ｇｃｍ（－３），μ（ＭｏＫα）＝１１８．６０７ｃｍ（－１），Ｆ（０００）＝２１０４．晶体结构由重原子法求得。最终偏离因子Ｒ＝０．０７２。晶体由分立的（Ｃ５Ｈ７Ｓ２）＋阳离子和［Ｂｉ２Ｃｌ９］３－阴离子组成。每个Ｂｉ原子和６个Ｃｌ原子形成畸变的八面体配位。２个［ＢｉＣｌ６］八面体共面构成具有２次轴对称的［Ｂｉ２Ｃｌ９］（３－）配阴离子。还讨论了阳离子种类对Ｂｉ配阴离子结构类型的影响。     

(Cl_2AlNH_2)_n和(H_2AlNH_2)_n(n=1～ 5)簇结构及其热力学性质

用 HF自洽场理论和密度泛函理论 (DFT)的 B3LYP方法 ,在 6 31G水平上研究了低聚物 (Cl2AlNH2)n和 (H2AlNH2)n(n=1～ 5)簇的几何构型、电子结构和聚合反应热力学性质 ,比较了两个系列化合物中化学键的强度 .结果表明 ,Cl2AlNH2和 H2AlNH2分子为 C2υ (EC)平面型结构 ,其中 Al－ N为由一个σ键和一个π键组成的双键 .(Cl2AlNH2)n和 (H2AlNH2)n(n=1～ 5)分子为 Dnh对称 ,Al－ N是典型的σ单键 .低聚物 (Cl2AlNH2)n和 (H2AlNH2)n的稳定性顺序分别为 : 3 > 2 > 4> 5 > 1和 8 > 7 > 9 > 11 > 6.     

对甲苯磺酰氯催化的meso-四芳基卟啉的合成

报道了一种改进了的meso-四芳基卟啉合成方法.利用对甲苯磺酰氯催化吡咯和芳香醛缩合生成中间物卟啉原,卟啉原中间物在紫外光照射下被空气氧化生成四芳基卟啉.该方法所用催化剂价廉易得,氧化过程绿色.整体反应条件简单,易于操作,产率高.     

Production of 5‐Hydroxymethylfurfural from Fructose in Ionic Liquid Efficiently Catalyzed by Cr(III)‐Al2O3 Catalyst

A series of metal‐Al₂O₃ catalysts were prepared simply by the conventional impregnation with Al₂O₃ and metal chlorides, which were applied to the dehydration of fructose to 5‐hydroxymethylfurfural (HMF). An agreeable HMF yield of 93.1% was achieved from fructose at mild conditions (100°C and 40 min) when employing Cr(III)‐Al₂O₃ as catalyst in 1‐butyl‐3‐methylimidazolium chloride ([Bmim]Cl). The Cr(III)‐Al₂O₃ catalyst was characterized via XRD, DRS and Raman spectra and the results clarified the interaction between the Cr(III) and the alumina support. Meanwhile, the reaction solvents ([Bmim]Cl) collected after 1^st reaction run and 5^th reaction run were analyzed by ICP‐OES and LC‐ITMS and the results confirmed that no Cr(III) ion was dropped off from the alumina support during the fructose dehydration. Notably, Cr(III)‐Al₂O₃ catalyst had an excellent catalytic performance for glucose and sucrose and the HMF yields were reached to 73.7% and 84.1% at 120°C for 60 min, respectively. Furthermore, the system of Cr(III)‐Al₂O₃ and [Bmim]Cl exhibited a constant stability and activity at 100°C for 40 min and a favorable HMF yield was maintained after ten recycles.     

[Nd_2O(C_5H_5)_6](C_12H_9N_2)3Cl·mC_4H_8O的晶体结构

本文报告用单晶X-射线衍射法测定[Nd_2O(C-5H_5)_6](C_(12)H_9N_2)_3C1·mC_4H_5O的晶体结构。晶体属于单斜晶系,空间群为P2-1/c,晶胞参数为a=20.982(15),b=11.217(7),c=32.954(32),β=104.17(7)°;Z=4。Nd和C1原子坐标用直接法定出,其他原子坐标以差Fourier方法求得,经过最小二乘法修正,R因子为0.159。在分子中三个茂环皆通过η~5。键与Nd原子配位,两个Nd原子间存在桥氧原子,因而形成(Nd_2O(C_5H_5)_6)~(2-)阴离子,Nd-C键基本上属于离子键。三个邻菲罗啉基团通过氢键与C1原子连接形成大的阳离子[(C_(12)H_9N_2)3-C1]~(2+)。     

STRUCTURE OF（C6H5COCHCOC6H5）SmI2（THF）3

<正> (C6H5COCHCOC6H5)SmI2(THF)3,Mr= 843. 75,triclinic space group P1,a=13. 274(3),b=9. 886(3),c= 12. 526(4)A,a= 110. 89(3),B=93. 98(2),y=85. 16(2) ,V=1528. 9(8)A3,Z=2,Dc=1. 83g/cm3, (MoKa) = 0. 71069A,u= 40. 3cm-1,F(000) - 810. The structure was solved by Patterson and Fourier techniques and refined by least-squares method to a final conventional R value of 0.082(Rw= 0. 083). The central Sm(III) ion is coordinated by two iodine ions, two oxygen atoms from C6H5COCHCOC6H5 and three oxygen atoms from three THF molecules to form a distorted pentagonal bipyramid. The Sm-I distances are 3. 103 and 3. 092 A ,The Sm-O (O atom from C6H5COCHCOC6H5) distances are 2. 273 and 2. 307 A and the average Sm -O(THF) distance is 2. 500A.     

Synthesis and Crystal Structure of [Mn（DPMT）2Cl2（H2O）2]

The title compound [Mn(DPMT)2Cl2(H2O)2] (DPMT = 1-[[2-(2,4-dichlorophenyl)- 1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole) was synthesized by the reaction of MnCl2·4H2O and DPMT in ethanol solution and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/c with a = 23.913(4), b = 7.8883(13), c = 8.6291(14) , β = 95.816(3)o, V = 1619.4(5) 3, Z = 2, C24H26Cl6MnN6O6, Mr = 762.15, Dc = 1.563 g/cm3, μ = 0.950 mm-1, S = 1.045, F(000) = 774, R = 0.0462 and wR = 0.0981. The molecular structure is a centrosymmetric conformation, and two ligands are symmetrically located on both sides of the Mn atom. The manganese atom is surrounded by two nitrogen atoms from ligands, two chlorine atoms and two oxygen atoms from water molecules to form a slightly distorted octahedral geometry.     

C_2H_3Cl分子团簇内部离子-分子反应产生C_4H_5Cl~ 的研究

用同步辐射对（C2H3Cl）分子团簇进行了光电离研究，发现该团簇内部发生了离子－分子化学反应，生成了十分稳定的反应产物C4H5Cl＋，不再是varderWaals弱键络合物．本文对反应机理进行了初步探讨     

Ab initio Study of the Potential Energy Surface and Product Branching Ratios for Reaction of O（^1D） with C2H5CI

The potential energy surface of O（^1D）＋C2H5Cl reaction was studied using QCISD（T）/6- 311＋＋G（d,p）//MP2/6-31G（d,p） method. The calculations reveal an insertion-elimination mechanism. The insertion reaction of O（^1D） and C2H5Cl produces two energy-rich intermediates, IM1 and IM2, which subsequently decompose into various products. The calculations of the branching ratios of various products formed through the two intermediates were carried out using RRKM （Rice-Ramsperger-Kassel-Marcus） theory at the collision energies of 0, 20.9, 41.8, 62.7, 83.6, 104.5, and 125.4 kJ/mol. HCl is the main decomposition product for IM1; CH2OH is the main decomposition product for IM2. Since IM1 is more stable than IM2, HCl is probably the main product of the O（^1D）＋C2H5Cl reaction.