碘冉酸阴离子桥联双核铜（Ⅱ）配合物的合成与磁性

碘冉酸阴离子桥联双核铜（Ⅱ）配合物的合成与磁性孟祥军寇会忠邹国彰廖代正姜宗慧＊王耕霖（南开大学化学系天津３０００７１）关键词碘冉酸，Ｃｕ（Ⅱ），双核配合物，合成，磁性１９９６－０８－２０收稿，１９９６－１１－１８修回国家自然科学基金资助项目随着生物无...     

2,3—二氢—5,6—二苯基吡嗪及其2∶1硝酸银配合物的合成与晶体结构

合成了配体2,3-二氢-5,6-二苯基吡嗪(C_(16)H_(14)N_2)及其硝酸银配合物AgNO_3(C_(16)H_(14)N_2)_2, 并用CAD4衍射仪测定了它们的晶体结构。晶体学数据为, 配体C_(16)H_(14)N_2: 单斜晶系, 空间群P2_1/n, a=0.5685(3),b=0.7928(1), c=2.7261(8) nm, β=95.02(6)°, V=1.2287 nm, z=4,D_c=1.27gcm~(-3),μ=0.81cm~(-1),R=0.031, R_w=0.033; 配合物AgNO3(C_(16)H_(14)N_2)_2:单斜晶系, 空间群A2, a=0.5655(3), b=0.7771(2), c=3.0.502(5) nm, β=94.90(2)°, V=1.3355 nm, z=2, D_c=1.59gcm~(-3),μ=7.87cm~(-1), R=0.033, R_2=0.028。测定结果表明, 在C_(16)H_(14)N_2分子中, 有关键长、键角均符合相应正常值。在AgNO3(C_(16)H_(14)N_2)_2晶体中NO_3~-为双齿配体; C_(16)H_(14)N_2则因吡嗪环上苯基的空间障碍而作为单齿配体出现; Ag原子处于二重轴上, 周围由四个氧和两个氮原子组成严重扭曲的配位八面体; Ag(1)—O(1)键长为2.828, Ag(1)—O(2)为2.520, Ag(1)—N(31)为0.2399 nm. Ag的配位八面体间借公用相对两个顶点氧原子而构成无限链状结构.     

钒（Ⅳ）与N，N，N＇，N″，N″─五苯并咪唑甲基二乙三胺多核配合物合成、ESR和生物活性

合成了两种新的Ｎ，Ｎ，Ｎ＇，Ｎ″，Ｎ″─五苯并咪唑甲基二乙三胺ＶＯ（Ⅱ）多核配合物并进行了元素分析、ＩＲ、ＵＶ─ｖｉｓ、ＥＳＲ等表征。求得了配合物的自旋Ｈａｍｉｌｔｏｎ参数，两配合物中Ｖ（Ⅳ）的电子环境差别较大。体外抗癌活性和农药活性测定结果表明配合物具有一定生物活性。     

Crystal structure of the complex of dibenzo-30-crown-10 with dysprosium isothiocyanate

Crystalline [Dy(NCS)₃(dibenzo-30-crown-10)(H₂O)₂]·H₂O·MeCN can be obtained by slowly evaporating a reaction mixture of Dy(NCS)₃·nH₂O with dibenzo-30-crown-10 in a solution of acetonitrile. The material crystallizes in the monoclinic space groupP2₁/n, the cell parameters area=11.450(5),b=23.284(4),c=18.424(6)Å, =106.28(4)°,V=4715ų,M=968.47,D _x=1.36 g cm^–1, =17.80 cm^–1,F(000)=1972,Z=4.2740 independently observed [I3I] reflections were used in the final least-squares refinement leading to an agreement index ofR=0.085. The Dy(III) ion coordination geometry approximates a square antiprism, involving two water oxygens and three dibenzo-30-crown-10 oxygen atoms and three isthiocyanate nitrogens. Hydrogen bonds are formed between the two water molecules and four uncoordinated crown ether oxygen atoms. Supplementary Data relevant to this paper have been deposited with the British Library as Supplementary Publication No. SUP 82148 (22 pp.)     

连续可导函数类的最优拉格朗日插值

在构造拉格朗日插值算法时,插值结点的选择是十分重要的.给定一个足够光滑的函数,如果结点选择的不好,当插值结点个数趋于无穷时,插值函数不收敛于函数本身.例如龙格现象:对于龙格函数f(x)=1/1+25x^2,如果拉格朗日插值的结点取[-1,1]上的等距结点,那么逼近的误差会随着结点个数增多而趋于无穷大⑴,由此可知插值结点的选择尤为重要.     

Selective production of γ-Valerolactone from ethyl levulinate by catalytic transfer hydrogenation over Zr-based catalyst

Research on Chemical Intermediates - The catalytic transfer hydrogenation (CTH) reaction of ethyl levulinate (EL) with alcohol to γ-valerolactone (GVL) has been investigated over a series of...     

Spectrophotometric method for the determination of telmisartan with congo red

In pH 2.50 HCl-NaAc buffer solution, the reaction between telmisartan and congo red could form ionassociation complex, which has the maximum absorbance at 593 nm in the spectrophotometric experiment. Under this wavelength, the Beer’s law was obeyed within the concentration range of 1.08 × 10⁻⁶−2.24 × 10⁻⁵ M. The linear regression equation was A = −0.1913 × 10⁵ c + 0.0286 (C: M). The regression coefficient r was 0.9986. The apparent molar coefficient ɛ₅₉₃ was 1.63 × 10⁴ L mol⁻¹ cm⁻¹ and the detection limit was 5.66 × 10⁻⁷ M. The established method having high sensitivity and good selectivity could be applied to the determination of telmisartan in pharmaceutical, urine and blood plasma samples with satisfactory results. The reaction mechanism was also discussed by using density functional theory methods. The result obtained was consilient with experimental data. The article is published in the original.)     

Copper, a chemical Janus: two copper(II) complexes with different ligand in one single crystal

A chemical Janus, binuclear copper(II) complexes, {[Cu(TPA)Cl][Cu(BPA)Cl]}(ClO₄)₂ (TPA = Tris(2-pyridylmethyl) amine, BPA = bis-(2-pyridylmethyl)amine) containing two different ligands has been synthesized and characterized by X-ray single crystal analysis. Crystal data: triclinic, space group P1$sm, a = 12.529(3), b = 12.655(3), c = 13.458(3) Å, = 70.48(3), = 67.40(3), = 75.81(3)°, D _x = 1.648 mg m^–3, and Z = 2. The molecular structure shows that the binuclear copper complex consists of two positive cation and two perchlorate anions. The positive cations moieties have different ligands. Cu(1) is coordinated by four nitrogen atoms from TPA and one chloride atom, forming a square-pyramidal geometry, whereas the coordinate number of Cu(2) is four, three of which are from BPA, one from chloride. There are two weak bonds between the Cl(2a) ion and the Cu(2) ion (2.844 Å) and the distance of Cu(2)=O(13) is 2.750(9) Å.     

1，2－亚丙基双（草酰胺根）桥联的线性三核铜（Ⅱ）配合物的合成与磁性

本文合成和表征了四种新的三核铜（Ⅱ）配合物｛［Ｃｕ（Ｌ）］２［Ｃｕ（ＣＨ３－ｅｂｏ）］｝（ＣｌＯ４）２（ＣＨ３ｅｂｏ表示１，２－亚丙基双（草酰胺根），Ｌ表示１，１０－菲咯啉（ｐｈｅｎ）（１），５－硝基－１，１０－菲咯琳（ＮＯ２－ｐｈｅｍ）（２），２，２’－联吡啶（ｂｐｙ）（３）和４，４’－二甲基－２，２’－联吡啶（Ｍｅ２ｐｙ）（４））．测定了四种配合物的变温磁化率（７７－３００Ｋ），求得交换参数分别为Ｊ１＝－２１９．６ｃｍ－１，Ｊ２＝－１９１．７ｃｍ－１，Ｊ３＝－２００．８ｃｍ－１，Ｊ４＝－１８５．５ｃｍ－１，表明Ｃｕ（Ⅱ）－Ｃｕ（Ⅱ）离子间存在着强的反铁磁交换相互作用．     

Paramagnetic and diamagnetic binuclear copper(II) complexes with different bidentate exogenous bridges: synthesis, spectroscopy and magnetic properties

Summary Four binuclear Cu^II complexes, [Cu₂(L)(-X)], have been prepared and characterized, where H₃L is a 2:1 Schiff base derived from 2-hydroxy-1-naphthaldehyde and 1,3-diamino-2-propanol and X = 1,3-N₃ (1), C₃H₃N₂ (pyrazolate) (2), AcO (3) and PhCO₂ (4). The Cu^IIions are bridged by endogenous alkoxide and bidentate exogenous bridges. The variable-temperature magnetic analyses show that complexes (2)–(4) exhibit antiferro-magnetic coupling with the exchange integrals, 2J, from- 188 to -158 cm^-1. The -1,3-azide-bridged binuclear Cu^II complex (1) shows the essential features of diamagnetism through measurements of its variable-temperature susceptibility and e.p.r. spectra. The results suggest that (1) can act as a diamagnetic model for metazidohemocyanin.