对位取代苯甲酸与2，2′-联吡啶配体构筑的两种二价铅配合物的合成、晶体结构及性质

水热条件下,合成了2个含对位取代苯甲酸和2,2′-联吡啶配体的二价铅配合物[Pb(4-HOBA)₂(2,2′-bipy)]·H₂O (4-HOBAH =4-hydroxybenzoic acid,2,2′-bipy=2,2′-bipyridine) (1)及[Pb(4-MBA)₂(2,2′-bipy)](4-MBAH=4-methylbenzoic acid) (2),并通过X-射线单晶结构分析、元素分析、红外光谱、紫外光谱、荧光光谱以及热重分析等手段对配合物进行了表征与研究。X-射线单晶结构测定表明,2种晶体的不对称单元中,六配位的二价铅离子分别与来自1个2,2′-联吡啶的2个N原子和2个对位取代苯甲酸的4个O原子螯合。配合物1属单斜晶系,P2₁/c空间群,a=1.094 83(4) nm,b=1.751 94(6) nm,c=1.204 79(4) nm,β=100.334(2)°,V=2.273 39(14) nm³,Z=4,final R₁=0.025 4,wR₂=0.067 4。广泛存在的分子间氢键和弱π…π堆积作用将配合物1组装成稳定的三维超分子结构。配合物2属三斜晶系,P1 空间群,a=0.955 10(11) nm,b=1.008 05(12) nm,c=1.324 83(15) nm, α=109.865(1)°,β=97.322(1)°,γ=90.643(1)°,V=1.187 8(2) nm³,Z=2,final R₁=0.028 4,wR₂=0.050 8。配合物2经由一对Pb…O(0.318 5(2) nm)弱相互作用被组装成二聚体结构,弱的Pb…O相互作用及与配合物1中类似的π…π堆积作用共同构筑了配合物2的三维结构。在配合物1和2中,铅的6s孤电子均显示了立体化学活性,使配位键分布于半球型区域。同时,两种配合物固体均具有光致发光特性,并在蓝光区有较强发射。     

新型三联吡啶铜配合物的晶体结构及DNA切割活性

本文合成了新型三联吡啶铜配合物[Cu(ttpy)(acetone)Cl]·(NO₃)(H₂O)₃(ttpy=4′-p-tolyl-2,2′∶6,2″-terpyridine),通过元素分析和X-射线单晶衍射进行结构表征。该配合物属三斜晶系,空间群为P1,晶胞参数为a=0.847 6(3) nm,b=1.265 0(5) nm,c=1.422 7(5) nm,α=111.017(7)°,β=92.174(7)°,γ=90.562(7)°,V=1.422 5(9) nm³,Z=2,D_c=1.309 Mg·m^-3,μ(Mo Kα)=9.00 cm^-1,F(000)=578,R₁=0.063 3,wR=0.141 4。在配合物中,中心铜原子的配位环境为变形四方锥,并通过分子内和分子间的C-H…Cl和C-H…O氢键作用形成三维梯状结构。凝胶电泳结果表明,在pH=7.4,温度37°,以抗坏血酸为还原剂的条件下,该配合物对超螺旋pUC19 DNA表现出一定的切割活性。紫外-可见光谱结果显示,该配合物与四种核苷的反应活性顺序为：5′-GMP>5′-AMP>5′-TMP≈5′-CMP。     

一维链状配位聚合物[Cd{5-(NO2)sal}2(2,2′-bipy)]n的合成与晶体结构

A coordination polymer of [Cd{5-(NO₂)sal}₂(2,2′-bipy)]_n(5-(NO₂)sal=5-nitrosalicylate, 2,2′-bipy=2,2′-bipyridine) was synthesized by hydrothermal reaction and characterized by elemental analysis, IR and X-ray diffraction single crystal structure analysis. The title complex crystallizes in monoclinic with space group C2/c, a=2.730 8(16) nm, b=1.272 3(5) nm, c=0.674 5(3) nm, β=96.73(2)°, V=2.327(2) nm³, Z=4, R=0.022 2, wR=0.057. The 5-nitrosalicylate anions doubly bridge the Cd(Ⅱ) atoms to form one-dimensional polymeric chain with the repeated eight-membered ring units (Cd-O-C-O)₂. The crystal structure is stabilized by intra- and interchain hydrogen bonds interactions. CCDC: 694568.     

配合物[Cu(m-TFBA)(phen)(H2O)2]·(m-TFBA)的水热合成、晶体结构及量子化学研究

以醋酸铜、间三氟甲基苯甲酸(m-TFBA)和邻菲咯啉(phen)为原料在甲醇水介质中通过水热反应,合成了一个新的单核 铜?髤配合物[Cu(m-TFBA)(phen)(H₂O)₂]·(m-TFBA),用元素分析、红外光谱和热重分析对配合物进行了表征。X-射线单晶衍射表明,配合物属三斜晶系,空间群P1,晶胞参数：a=1.001 61(10) nm,b=1.150 69(12) nm,c=1.286 49(12) nm,α=82.217(2)°,β=84.767(2)°,γ=66.371(2)°,V=1.344 8(2) nm³,Z=2,D_c=1.625 g·cm^-3,R₁[I>2σ(I)]=0.042 1,wR₂[I>2σ(I)]=0.095 8。铜(Ⅱ)分别与来自邻菲咯啉的2个氮原子、间三氟甲基苯甲酸的1个氧原子和2个水分子中的2个氧原子配位,形成变形的四方锥结构。配合物通过强的O-H…O氢键作用形成了二聚体结构,该二聚体又通过分子间弱的C-H…O氢键作用形成了一维链状结构。配合物中配位的间三氟甲基苯甲酸上的三氟甲基基团具有无序结构。对配合物中[Cu(m-TFBA)(phen)(H₂O)₂]⁺进行了量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。     

配合物[Cu2(m-MBA)4(2，2′-bipy)2(H2O)]·H2O的水热合成、晶体结构及电化学分析

A copper(Ⅱ) complex [Cu₂(m-MBA)₄(2，2′-bipy)₂(H₂O)]·H₂O with m-methylbenzoic acid (m-MBA), 2,2′-bipyridine (2,2′-bipy) and water molecule has been synthesized by means of hydrothermal way and characterized. Crystal data for this complex: monoclinic, space group C2/c, a=2.591 8(5) nm, b=1.414 2(3) nm, c=1.790 8(4) nm, β=131.80(3)°, V=4.893 3(17) nm³, D_c=1.379 g·cm^-3, Z=4, F(000)=2 104 , Final GooF=1.034, R₁=0.065 6, wR₂=0.197 6. The crystal structure shows that two neighboring copper(Ⅱ) ions are linked together by two bridging-chelating m-methylbenzoic acid groups, one bridging water molecule, forming a cage structure and the Cu(Ⅱ)-Cu(Ⅱ) bond distance is 0.366 7 nm. Each copper(Ⅱ) ion is coordinated with two nitrogen atoms of one 2,2′-bipyridine molecule and four oxygen atoms from three m-methylbenzoic acid molecules and one water molecule, repectiveley, forming a distorted octahedral coordination geometry. The cyclic voltammetric behavior of the Complex was also investigated. CCDC: 648619.     

2-苯甲酰苯甲酸铜配合物的合成、电化学、荧光及磁性研究

以2-苯甲酰苯甲酸(HL)和1,10-邻菲啰啉(Phen)为配体合成了一个新的铜(Ⅱ)配合物{[Cu₂(Phen)₄(NO₃)][Cu(Phen)₂(L)]₂(L)₂(NO₃)₃}·2H₂O (1)。该化合物晶体属三斜晶系,空间群P1,晶胞参数:a=1.138 57(5) nm,b=1.193 49(7) nm,c=2.615 31(13) nm,α=89.428 0(10)°,β=82.753(2)°,γ=74.537 0(10)°,V=3.3968(3) nm³,D_c=1.408 g·cm^-3,Z=1,μ(MoKα)=0.700 mm^-1,F(000)=1 480,最终偏离因子R₁=0.057 1,wR₂=0.133 4。在标题配合物分子中,有2个单核阳离子[Cu(Phen)₂(L)]⁺和1个双核阳离子[Cu₂(Phen)₄(NO₃)]³⁺,中心铜(Ⅱ)离子的配位数都是五。测定了标题配合物的电化学、荧光和磁性。结果表明:在循环伏安过程中,配合物的电子转移是准可逆的,对应的电极反应是Cu(Ⅱ)/Cu?髣;当激发波长为488 nm时,配合物在494 nm附近有较强的荧光发射峰;在300~52 K,配合物具有抗磁性。     

邻乙酰氨基苯甲酸、邻菲咯啉锌(Ⅱ)配合物的合成、晶体结构及性质研究

在甲醇水混合溶剂中,以邻乙酰氨基苯甲酸(o-ABA),1,10-邻菲咯啉(phen)为配体与高氯酸锌合成了标题配合物[Zn(o-ABA)(phen)₂](ClO₄)·0.5H₂O。配合物(C₆₆H₅₀N₁₀O₁₅C₁₂Zn₂,分子量为1 424.80)晶体属三斜晶系,空间群P1,晶胞参数：a=1.181 6(6) nm,b=1.635 6(8) nm,c=1.752 2(9) nm,α=95.733(9)°,β=93.083(8)°,γ=109.212(8)°;V=3.168(3) nm³,D_c=1.494 g·cm^-3,Z=2,F(000)=1 460。最终偏离因子R₁=0.048 2,wR₂=0.098 3。晶体结构表明：锌原子与1个对乙酰氨基苯甲酸的2个氧原子,2个1,10-邻菲咯啉中的4个氮原子配位,形成六配位的变形八面体结构。并对配合物的热稳定性,光谱及电化学性质进行了分析。     

基于2-(4-甲基苯甲酰基)苯甲酸及2，2'-联吡啶的双核铜(Ⅱ)配合物的晶体结构、荧光和磁性

以2-(4-甲基苯甲酰基)苯甲酸(HL)及2,2'-联吡啶(2,2'-bipy)为配体合成了一个双核铜(Ⅱ)配合物[Cu₂(L)₄(2,2'-bipy)₂]·H₂O(1),并对其进行了晶体结构测定。测定结果表明,该配合物晶体属于三斜晶系,空间群为P1,晶胞参数：a=1.01257(15)nm,b=1.3125(2)nm,c=1.3170(2)nm,α=82.985(2)°,β=76.437(2)°,γ=88.290(2)°,V=1.6887(4)nm³,D_c=1.391g·cm^-3,Z=2,F(000)=732,GooF=1.027,最终偏离因子R₁=0.0375,wR₂=0.0914。在配合物分子中相邻的2个铜(Ⅱ)离子通过2个2-(4-甲基苯甲酰基)苯甲酸根桥联配位连接起来,其端位各与1个2-(4-甲基苯甲酰基)苯甲酸根和1个2,2'-联吡啶分子配位,整个分子形成了双核结构。测定了标题配合物的荧光和磁性,结果表明：当激发波长为608nm时,配合物在472和476nm处有2个较强的荧光发射峰;在2~100K,配合物具有顺磁性。     

一维螺旋链状配位聚合物[Cu(p-BDOA)(2，2′-bipy)·H2O]n的合成与表征(英)

A new copper(Ⅱ) coordination polymer, [Cu(p-BDOA)(2，2′-bipy)·H₂O]_n ( p-BDOA^2-=benzene-1,4-dioxyacetate dianion; 2,2′-bipy=2,2′-bipyridine) has been synthesized and characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. The Crystal crystallizes in orthorhombic system, the space group is P2₁2₁2₁, with the unit cell parameters a=0.698 4(1) nm, b=1.559 7(3) nm, c=1.750 6(4) nm and V=1.906 8(7) nm³, M_r=461.91, Z=4, R=0.057 5, wR=0.078 3. Each copper(Ⅱ) atom is six-coordinated and displays a distorted square pyramidal geometry with a one-capped base by one very long semicoordinate Cu-O(carboxylate) bond. Adjacent Cu(Ⅱ) ions are bridged by carboxylate groups, resulting in a one-dimensional helical chain. The adjacent Cu…Cu distance within the polymeric chain is 1.348 4 nm. Furthermore, such chains are linked through hydrogen bonds and π-π stacking interactions to form supramolecular network. CCDC: 219234.     

双核铕与2，5-二氟苯甲酸及2，2′-联吡啶配合物的合成、晶体结构及表征

用溶液法合成了混配配合物[Eu(2,5-DFBA)₃(2,2′-bipy)]₂(2,5-DFBA=2,5-二氟苯甲酸根,2,2′-bipy=2,2′-联吡啶),并测定了其晶体结构。该晶体属于三斜晶系,P1空间群。在配合物中,2个Eu³⁺离子被4个2,5-二氟苯甲酸根以双齿桥联和三齿桥联2种方式连接;每个Eu³⁺离子的配位数为9,分别与4个桥联2,5-二氟苯甲酸根的5个氧原子、1个双齿螯合2,5-二氟苯甲酸根的2个氧原子以及1个2,2′-联吡啶分子的2个氮原子配位。该配合物在紫外灯照射下发出强烈的红光,在荧光光谱的580、591、613、648和693 nm处出现5条谱线,分别是由Eu³⁺离子的⁵D₀ → ⁷F_j (j=0～4)跃迁产生的。     

Furyl- and thienyl-silatranes and germatranes

We review our research on the synthesis and study of the physical and biological properties of furyl- and thienylgermatranes and -silatranes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 725–732, June, 1992.     

Review and patents and literature

The use of the insect cell/baculovirus expression system for producing recombinant proteins of bacterial, plant, insect, and mammalian origin has become widespread. The popularity of this eukaryotic expression system is due to many factors, including (1) potentially high protein expression levels, (2) ease and speed of genetic engineering, (3) ability to accommodate large DNA inserts, (4) protein processing similar to higher eukaryotic cells (e.g., mammalian cells), and (5) ease of insect cell growth (e.g., suspension growth). The following review of the literature discusses two engineering aspects of recombinant protein synthesis by insect cell cultures: bioreactor scale-up and insect cell line selection. Following this review patent abstracts and additional literature pertaining to expression of recombinant proteins in insect cell culture are listed.     

Hard and soft acids and bases: structure and process

Under investigation is the structure and process that gives rise to hard-soft behavior in simple anionic atomic bases. That for simple atomic bases the chemical hardness is expected to be the only extrinsic component of acid-base strength, has been substantiated in the current study. A thermochemically based operational scale of chemical hardness was used to identify the structure within anionic atomic bases that is responsible for chemical hardness. The base's responding electrons have been identified as the structure, and the relaxation that occurs during charge transfer has been identified as the process giving rise to hard-soft behavior. This is in contrast the commonly accepted explanations that attribute hard-soft behavior to varying degrees of electrostatic and covalent contributions to the acid-base interaction. The ability of the atomic ion's responding electrons to cause hard-soft behavior has been assessed by examining the correlation of the estimated relaxation energies of the responding electrons with the operational chemical hardness. It has been demonstrated that the responding electrons are able to give rise to hard-soft behavior in simple anionic bases.     

Ground- and excited-state aromaticity and antiaromaticity in benzene and cyclobutadiene

The aromaticity and antiaromaticity of the ground state (S 0), lowest triplet state (T 1), and first singlet excited state (S 1) of benzene, and the ground states (S 0), lowest triplet states (T 1), and the first and second singlet excited states (S 1 and S 2) of square and rectangular cyclobutadiene are assessed using various magnetic criteria including nucleus-independent chemical shifts (NICS), proton shieldings, and magnetic susceptibilities calculated using complete-active-space self-consistent field (CASSCF) wave functions constructed from gauge-including atomic orbitals (GIAOs). These magnetic criteria strongly suggest that, in contrast to the well-known aromaticity of the S 0 state of benzene, the T 1 and S 1 states of this molecule are antiaromatic. In square cyclobutadiene, which is shown to be considerably more antiaromatic than rectangular cyclobutadiene, the magnetic properties of the T 1 and S 1 states allow these to be classified as aromatic. According to the computed magnetic criteria, the T 1 state of rectangular cyclobutadiene is still aromatic, but the S 1 state is antiaromatic, just as the S 2 state of square cyclobutadiene; the S 2 state of rectangular cyclobutadiene is nonaromatic. The results demonstrate that the well-known "triplet aromaticity" of cyclic conjugated hydrocarbons represents a particular case of a broader concept of excited-state aromaticity and antiaromaticity. It is shown that while electronic excitation may lead to increased nuclear shieldings in certain low-lying electronic states, in general its main effect can be expected to be nuclear deshielding, which can be substantial for heavier nuclei.     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).