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用分光光度法研究了2.6-二乙酰基吡啶缩二(氨基疏脲)与 Cu~(2+),Co~(2+),Ni~(2+),Zn~(2+)的配位反应,用作图法和自编的LEMIT-S程序计算了配合物的组成,摩尔吸光系数和稳定常数,两法所得的结果基本一致,结果表明,在乙醇中Cu~(2+)与配体daptsc形成Cu_2(daptsc)和Cu(daptsc),二者在溶液中共存,而Cu~(2+)在DMF中仅生成1:1配合物,其它金属离子在两种溶剂中均形成1:1型。在两种溶剂中lgβ_(11)的顺序为:Zn>Cu>Ni>Co 相似文献
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The dissociation constants of N-(para-substituted phenyl) iminodiacetic acid (p-RPhID A, R= Cl, H, CH3, CH3O) and N-(ortho-substituted phenyl) iminodiacetic acid (o-RPhlDA) and the formation constants of binary complex compounds of Cu(Ⅱ)-o-RPhIDA, Cu(Ⅱ)-p-RPhIDA, Co(Ⅱ)-p-RPhIDA, Ni(Ⅱ)-p-RPhIDA and Zn(Ⅱ)-p-RPhIDA were determined by pH method in the presence 0.1mol·dm-3KNO3 at 25℃ . It has been found that linear free energy relationships not only exist between stability of these binary complex compounds and base strength of ligand, but also exist between logβ and σ'(=pK2-pK2).The deviation of Cu(Ⅱ)-o-CH3PhIDA from linearity may be ascribed to steric effect of methyl group at ortho position. 相似文献
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本文利用乙酰基二茂铁与2,6-吡啶二甲酰肼的缩合反应,首次合成了乙酰基二茂铁2,6-吡啶二甲酰基腙(H2L),在甲醇溶液中得到了它与醋酸锌的固态配合物,其组成为Zn2L(CH3COO)2.8H2O用摩尔比法测定了H2L与Zn(Ⅱ)的配位比,结果表明与固态配合物中H2L与Zn(Ⅱ)的配位比相吻合。 相似文献
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《Journal of Coordination Chemistry》2012,65(1-2):173-182
Abstract The reaction, in water, of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) ions with sodium ampicillinate at room temperature has allowed isolation of dimers with the following general formula [M(amp)Cl]2 × nH2O (n = 1.5?3.2). The complexes were characterized by elemental analyses, conductivity measurements, magnetic susceptibilities and spectroscopic methods (IR, Raman, EPR and UV-Visible). A dinuclear structure based on octahedrally coordinated metal ions is proposed. 相似文献
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二(2,4,4—三甲基戊基)膦酸萃取稀土离子 总被引:9,自引:3,他引:9
2-乙基己基膦酸单2-乙基己基酯(HEH/EHP)是目前稀土湿法冶金工业中应用最广泛的萃取剂。但存在重稀土离子反萃取酸度高,某些中、重稀土离子对的分离系数小、选择性不高等缺点。所以研究优于HEH/EHP的新萃取体系已引起人们极大的关注。近年来发现,二(2,4,4-三甲基戊基)膦酸(HBTMPP,HL)有可能是萃取稀土元素的有效萃取剂。由于其分子中不含酯氧原子,使得它的pK。值比HEH/EHP高。因此,用HBTMPP萃取稀土及其它高价 相似文献
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《Journal of Coordination Chemistry》2012,65(1):23-29
Abstract Complexes of the meso and racemic forms of the disulfoxides 1,2-bis(phenylsulfinyl) methane and 1,2-bis (phenylsulfinyl) ethane have been synthesized and characterized. Bond type and ligand field parameters have been determined from infrared and visible-uv diffuse reflectance spectroscopy. There were essentially no observed differences in the properties of complexes of the meso and racemic forms of the ligands. 相似文献
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Shi Zheng ZHU 《中国化学快报》1992,3(8):601-604
The ccndensation reactions occurred when heating bis(perfluoroalkane-sulfonyl)methanes with aromatic aldehydes in acetic acid anhydrideand gave high yields of 1-aryl-2,2-di(perfluoroalkanesulfonyl)ethylenesThe perfluoroalkanesulfonyl groups R_FSO_2 are known as the strongestelectron-attracting substituents~(1-2).This property is often used in theactivation of C-C multiple and 2,2'-C-H bonds.The synthesis and reactionsof perfluoroalkanesulfonyl substituted alkenes and alkynes are of greatinterest in synthetic organic chemistry~(3-6).Recently,Hanack~7 reported the preparation of 2-aryl-l-(perfluoroalkane-sulfonyl)acrylonitrile R_FSO_2C(CN)=CHAr.However,he failed to obtainthe 1,1-di(perfluoroalkanesulfonyl)alkenes by the Knoevenagel reactionof bis(perfluoroalkanesulfonyl)methane with aldehydes. 相似文献
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《Journal of Coordination Chemistry》2012,65(1-2):97-108
Abstract The synthesis of the new ligand 1,8-bis(quinolyloxy)-3,6-dithiaoctane (1) and the corresponding Cu(II), Cu(I) and Co(II) complexes is reported. The crystal and molecular structure of the copper(II) complex, [Cu(1)](ClO4)2.3H2O, has been determined by X-ray diffraction methods. The complex crystallizes in the orthorhombic space group Fddd, with cell data Z = 16, a = 20.326(2), b = 20.879(3) and c = 28.308(4)Å. The structure consists of discrete [Cu(1)]?2+ cations separated by (structurally disordered) perchlorate anions and three lattice water molecules per cation. The coordination geometry about the copper atom is pseudo-octahedral with the quinoline nitrogen and thioether sulfur atoms at the equatorial positions and the ether oxygen atoms at the axial positions. 1H NMR line-broadening experiments indicate that electron-transfer self-exchange reactions between the copper(I) and copper(II) complexes of (1) is immeasurably slow on the NMR time-scale. The coordination chemistry of (1) is compared with its oxygen analogue, 1,8-bis(quinolyloxy)-3,6-dioxaoctane. 相似文献
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