bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and Structure of Lanthanide Sandwich Complexes with Mixed Cyclooctatetraenyl and Chelating Substituted‐indenyl Ligands
Authors: Huang Ji‐Ling , Shen Xiao‐Qiang , Liu Qian‐Cai , Qian Yan‐Long , Chan Albert Sun‐Chi 
Published: September 2010

AbstractTwo types of sandwich complexes (η5‐MeOCH2CH2C9H6) Ln (η8‐C8H8) (THF)n [Ln=La (1), Nd(2), n=0; Sm(3), Dy (4) and Er (5). n = l] and (η5‐C4H7OCH2C9H6)Ln(η8‐C8H8) (THF) [Ln = La (6), Nd(7). Sm(8). Dy (9) and Er (10)] were synthesized by the reactions of LnCl3 with equivalent mole of K2C8H8, followed by treatment with corresponding potassium salt of ether‐substituted indenide. The molecular structures of 3 and 8 were determined by single crystal X‐ray diffraction. (η5 ‐MeOCH2CH2C9H6) Sm (η8‐C8H8) (THF) (3) monoclinic. Pt1/c, a = 1.4793(3) nm, b = 0.8716 (2) nm, c = 1.6149 (3) nm, β = 98. 17(3), V = 2.0612(7) nm3, Z = 4, R(F)=0.0362. (η5‐C4H7OCH2C9H6)Sm(η8‐C8H8)(THF) (8) orthorhombic. p212121. a = 0.8754(2) nm, b = 1.1000(2) nm, c = 2.3117 (5) nm, V = 2.2260(8) nm3, Z=4, R(F) =0.0497.
Synthesis of Distamycin Analogs and Their Interactions with Calf Thymus DNA
Authors: Xiao Jun‐Hua , Yuan Gu , Huang Wei‐Qiang , Du Wei‐Hong , Wang Bao‐Huai , Li Zhi‐Fen 
Published: September 2010

AbstractTwo distamycin analogs (PyPyPy‐γ‐Dp and PyPyPyPy‐γ‐Dp) were synthesized by a haloform reaction and the DCC/HOBT coupling reaction in a ample and fast way without amino protection. By using calf thymus DNA, the interaction between the analogs and DNA duplex was studied by CD, and ITC.
Concise and Effective Synthesis of 1→2 α‐Linked Mannopyranosyl Oligosaccharides and Related Antigenic Factor 34 and Dominant of Antigenic Factor 13
Authors: Zhu Yu‐Liang , Kong Fan‐Zuo 
Published: September 2010

AbstractA highly concise and effective synthesis of 1 → 2 α‐linked mannopyranosyl oligosaccharides was achieved via TMSOTf promoted condensation of the corresponding benzoylated monosaccharide alkyl orthoester. 1→2 α‐Linked mannosyl di, trisaccharide, antigenic factor 34, and dominant of antigenic factor 13 were readily synthesized by the new method.
Speciation Analysis of Serum Copper by Ultrafiltration Combined with Graphite Furnace Atomic Absorption Spectrometry
Authors: Wang Zhi‐Hua , Ma Hui‐Min , Ma Quan‐Li , Liang Shu‐Chuan 
Published: September 2010

AbstractUltrafiltration combined with graphite furnace atomic absorption spectrometry (GFAAS) was used to study protein binding and speciation of copper in human serum. Ultrafiltration was carried out using a cell unit with ultrafiltration membranes having a nominal cut‐off of 10,000 Dalton. The effects of various experimental factors including the kind and concentration of electrolyte, sample storage, pH. pressure and the preconditioning of the membranes on the speciation analysis of serum copper by ultrafiltration were examined. It was observed that 4.5 ± 2.3% of the total copper in serum was ultrafiltrable and this value did not seem to be influenced by the total serum elemental concentration, the pH (6.5–10) and the pressure (≤ 1.5 kg/cm2). The preconditioning of the ultrafiltration system with 0.1 mol/L calcium nitrate can overcome the adsorption loss of copper effectively, and the addition of tris‐HCl solution (pH 7.4) to serum accelerates the ultrafiltration. The present method was proved to be suitable for speciation analysis for its simplicity, rapidity, small sample requirement and easy control. The results obtained with the method are accurate and reliable.
Catalytic Hydrolysis of Phosphate Diester with Metal Complexes of Macrocyclic Tetraamine in Comicellar Solution
Authors: Xiang Qing‐Xiang , Yu Xiao‐Qi , You Jing‐Song , Yan Qian‐Shun , Xie Rn‐Gang 
Published: September 2010

AbstractFour novel pyridine or benzene ring‐containing pendant macrocyclic dioxotetraamines 2,6‐dixo‐l,4,7,10‐tetraazacyclododecane ligands have been synthesized. Their metal complexes have been investigated as catalysts for the hydrolysis of bis(p‐nitrophenyl) phosphate (BNPP) in aqueous comicellar solution. The results indicate mat the hydrophobic interaction between substrate and metal complex, the nature of transition metal ion, and the micellar microenvironment are important factors for the hydrolysis of BNPP. Large rate enhancement (up to over two‐three orders of magnitude) employing 5 has been observed.
Syntheses and Properties of New Pendant‐armed Calix[4]arene Derivatives as Cesium Selective Ionophore
Authors: Xing Yan‐Jun , Zhou Zhi‐Xian , Wu Yang‐Jie 
Published: September 2010

AbstractTwo new pendant‐armed calix[4]arene derivatives 5 and 6 have been synthesized. The study of alkali metal picrates extraction indicates that both compounds show preference of cesium cation, compound 6 in 1,3‐alternate conformation has better extractibility for Cs+ than compound 5. The coordination behavior of compound 6 with cesium cation was studied by 1H NMR spectroscopy. The Cs+ selective electrode based on compound 6 exhibits a linear, near Nernstian response characteristics, the slope is 56.4 mV/decade in me concentration range of 10−4—10−1 mol/L, the selectivity coefficient (logKpotCs.Na) is −3.39.
Monobromination of Activated Aromatic Compounds with Polyvinylbenzyltriphenylphosphonium Supported Tribromide
Authors: Wu Ming‐Hu , Yang Gui‐Chun , Chen Zu‐Xing 
Published: September 2010

AbstractChloromethylated crosslinked co‐polyvinylbenzene‐divinylbenzene (2% DVB) was treated with triphenylphosphine and then with sodium bromate and hydrobromic add to afford red colored insoluble polyvinylbenzyltriphenylphosphonium supported tribromide. This reagent could be used as a mild and efficient monobrominating reagent for activated aromatic compounds such as phenols, aromatic ethers, aromatic amines and acetylanilines with good yields and high para‐selectivity.
Molecular and Crystal Magnetic Engineering of Polymetallic Coupling System: From Magnetic Molecules to Molecular Magnets
Authors: Cheng Peng , Liao Dai‐Zheng 
Published: September 2010

AbstractOne of the main challenges in the field of molecular materials is the design of molecular ferromagnets. General design strategy includes two steps, that is molecular magnetic engineering and crystal magnetic engineering. The first step is the synthesis of ferromagnetically coupled polymetallic systems. The second step is the assembly of polymetallic systems with muti‐dimensional structure and exhibiting a ferromagnetic transition. This paper summarized the strategies of molecular design and crystal engineering allowed to obtain such systems and our efforts in the fields of molecular magnetism and molecular‐based magnets.
Thermodynamic Calculation in Elimination of Water Pollutants at Hydro‐geo‐chemical Barriers
Authors: Panayotova B. , Velkov M. 
Published: September 2010

AbstractThermodynamic saturation coefficients (Ks) and transformation indices (It) can be used to evaluate the possibility of forming hydro‐geo‐chemical precipitation barriers and assess the solid phase (rock) stability in aquifers. Calculations are made on the basis of data on water pH, Eh, conductivity (x) and some relevant ion concentrations. The dependencies of K2 and It on water pH and Eh values can be expressed graphically to estimate the barriers parameters. Barrier generation leads to a decrease in concentrations of pollutants due mainly to precipitation, co‐precipitation and/or sorption processes. Using the diagram Ks, It= f (pH, Eh), supplemented with representative data on concentrations of pollutants before and after the barrier, the elimination and migration of pollutants can be roughly evaluated (predicted) only on the basis of determining pH and Eh values of water and concentrations of ions participating in the barrier formation. The proposed method is applied to assess the migration and elimination of pollutants (U, 226Ra, β‐emitters, SO42) in Bulgarian uranium mine surroundings.
Valence Distributions of Iron and Manganese in Pure, Manganese‐doped and Calcium‐doped Yttrium Orthoferrite
Authors: Cao Xue‐Qiang , Zeng Yue 
Published: September 2010

AbstractThe valence distributions of Fe and Mn in yttrium orthoferrite (YFeO,), YFe0.6Mn0.4O3 and Y0.9Ca0.1Fe0.6Mn0.4O3.8 were studied by the measurement of thermal power. Pure YFeO3 shows the n‐type electrical conductivity associated with small polaron hopping between Fe2+ and Fe3+. Both YFe0.4Mn0.4‐O3 and Y0–9Ca0–1.Fe0–6Mn0–4O3–8 show n‐type and p‐type conductivities at high and low temperatures respectively associated with small polaron hopping between Mn3+ and Mn4+, iron has only oxidation state of Fe3+ and does not have contribution to the electrical conductivity.
Synthesis, Characterization and Magnetic Studies of μ‐Oxamido Copper (II) ‐ Chromium (III) Heterodinuclear Complexes
Authors: Li Yan‐Tuan , Yan Cui‐Wei , Hu Chun‐Xia , Liao Dai‐Zheng 
Published: September 2010

AbstractThree new μ‐oxamido‐bridged heterodinuclear copper (II)‐chromium (III) complexes formulated [Cu(Me2oxpn)Cr‐(L)2](NO3)3, where Me2oxpn denotes N,N'‐bis(3‐amino‐2, 2‐dimethylpropyl)oxamido dianion and L represents 5‐methyl‐1,10‐phenanthroline (Mephen), 4,7‐diphenyl‐1,10‐phenanthroline (Ph2phen) or 2,2′‐bipyridine (bpy), have been synthesized and characterized by elemental analyses, IR and electronic spectral studies, magnetic moments of room‐temperature and molar conductivity measurements. It is proposed that these complexes have oxamido‐bridged structures consisting of planar copper (II) and octahedral chromium (III) ions. The variable temperature magnetic susceptibilities (4.2–300 K) of complexes [Cu(Me2oxpn)Cr(Ph2phen)2](NO3)3 (1) and [Cu(Me2oxpn)Cr(Mephen)2] (NO3)3 (2) were further measured and studied, demonstrating the ferromagnetic interaction between the adjacent chromium (III) and copper (II) ions through the oxamido‐bridge in both complexes 1 and 2. Based on the spin Hamiltonian, Ĥ = ‐ 2JŜ1 · Ŝ2, the exchange integrals J were evaluated as + 21.5 an−1 for 1 and + 22.8 cm−1 for 2.
Syntheses, Crystal Structures and Cytotoxities of Silver (I) Complexes of 2,2′‐Bipyridines and 1,10‐Phenanthroline
Authors: Zhu Hai‐Liang , Chen Qi , Peng Wen‐Lie , Qi Sui‐Jian , Xu An‐Long , Chen Xiao‐Ming 
Published: September 2010

AbstractThe syntheses, characterizations and in vitro cytotoxities of seven soluble silver (I) compounds (1–7) with 2,2′‐bipyridine (bpy), 5,5′‐dimethyl‐2,2′‐bipyridine (dmbpy) and 1, 10‐phenanthroline (phen) are described. Two of the complexes, [Ag(dmbpy)(NO3)] (1) and [Ag(dmbpy)]ClO4(2), have been structurally established by single‐crystal X‐ray diffraction, which reveals the silver(I) atom in compound 1 is in a Y‐shape coordination geometry with two N atoms (av. AgN = 227.8 pm) from a chelate dmbpy ligand and an O atom (AgO=221.8(4) pm) from a monodentate nitrate. The Ag(I) atom in compound 2 is three‐coordinated by three N atoms, two of which are from a chelate dmbpy, and one from an acetonitrile ligand. The seven compounds showed strong cytotoxities in vitro to both normal and carcinoma cells.
Synthesis of a Cyclic Analogue of Galardin
Authors: Ma Da‐Wei , Wu Wen‐Gen , Qian Jing , Lang Shen‐Hui , Ye Qi‐Zhuang 
Published: September 2010

AbstractA cyclic analogue 4 of galardin, a known MMP inhibitor, is designed to improve its selectivity. The synthesis of 4 starts from dimethyl (S)‐malate using diaselective alkylation and subsequent cyclization and amide formation as key steps. The compound 4 showed MMP inhibitory activity on all MMPs tested with IC30, ranging from 20.1 μM to 104 μM.
Molecular Design of Calixarene 5. Syntheses and Cation Selectivities of Novel Schiff's Base p‐tert‐Butylcalix[4]arenes
Authors: Liu Yu , Zhao Bang‐Tun , Wang Hao , Chen Qi‐Fa , Zhang Heng‐Yi 
Published: September 2010

AbstractFive novel Schiff's bases p‐tert‐butylcalix[4]arenes have been synthesized in high yields by the reaction of 1,3‐distally disubstituted p‐tert‐butylcalix[4]arene amine (1) with the corresponding aromatic aldehydes, and their cation binding abilities and selectivities with alkali and heavy metal ions have been evaluated by solvent extraction of aqueous metal picrates to show the highest Ag+ extractability for Schiff's base p‐tert‐butylcalix[4]arene (6) and the best Na+/Li+ and Ag+/Ti+ selectivities for Schiff's base p‐tert‐butylcalix[4]arene (4 and 2) over any other calix[4]arene derivatives, respectively.
Synthesis of p‐tert‐Butyl‐calix[6] ‐biscrown‐3 via Intramolecular Ring‐closure of 1,4‐Bis (2‐(2‐chloroethoxy) ethoxy) ‐p‐tert‐butyl‐calix[6]arene
Authors: Chen Yuan‐Yin , Chen Yi‐Kun , Gong Shu‐Ling , Gao Zu‐Nong 
Published: September 2010

AbstractWith a variation in reaction conditions, 1, 4‐bis (2‐(2‐chloroethoxy)ethoxy)‐calix[6]arene (3) and l,3,5‐tris(2‐(2‐chloroethoxy) ethoxy)‐calix [6] arene (4) or 4 and 4‐chloroethoxyethoxy‐calix[6]crown‐3 (5) were selectively synthesized from p‐tert‐butyl‐calix [6] arene and 2‐(2‐chloroethoxy)ethyltosylate. l,3–4,6‐p‐tert‐butylcalix[6]‐bis‐crown‐3 (6) with (u,u,u,d,d,d) conformation and 1,3–4,5‐p‐tert‐butylcalix[6]‐biscrown‐3 (7) with self‐anchored (u,u, u, u, u, d) conformation were synthesized through an intramolecularly ring‐closing condensation of 1, 4‐bis (2‐(2‐chloroethoxy)ethoxy)‐p‐tert‐butyl‐calix[6]arene (3) in 25% and 15% yield, respectively. Using 5 instead of 3, only 7 was obtained in 65% high yield. 6 and 7 show different complexation properties toward alkali metal and ammonium ions.
Enantioselective Recognition of Calix[4]arene Derivative Bearing Bicyclic Guanidinium forD/LAmino Acid Zwitterions
Authors: Liu Fang , Lu Guo‐Yuan , He Wei‐Jiang , Wang Zhen‐Sheng , Zhu Long‐Gca 
Published: September 2010

AbstractThep‐tetra‐tert‐butyl calix[4] arene derivatives (3 and 4) with (5,5) chiral bicyclic guanidinium, as the receptors of amino acid zwitterions, have been synthesizedviaa O‐alkylation reaction ofp‐tetra‐tert‐butyl calix [4] arene with cbJoromethyl chiral bicyclic guanidinium 2 in the presence of anhydrous K2CO3in acetonitrile. The results obtained from liquid‐liquid competitive extraction experiments indicate that the two receptors may selectively recognizeL‐aromatic amino acids, and that the enantioselective recognizability of the receptor 4 with two chiral bicyclic guanidinium units reachs up to about 90% forL‐Phe.
Preparation and Molecular Structure of Binuclear Nickel (I) Complex Bridged by 1,2,4, 5‐Benzenetetracarboxylato Tetravalent Anion
Authors: Cheng Ya‐Qian , Lin Wen‐Jiao , Hu Mao‐Lin , Yuan Ji‐Xin , Wang Shun , Wang Jia‐Guo 
Published: September 2010

AbstractThe title complex [(H2O)2(IMI)3Ni(TCB)Ni(IMI)3‐(H2O)2] H2O (TCB = 1,2,4,5‐benzenetetracarboxylato te‐travalent anion; IMI = imidazole) has been prepared by the reaction of Ni(IMI)3(Ac)2 and TCB in aqueous solution. The crystal structure has been determined by single‐crystal X‐ray diffraction method. It crystallizes in the monoclinic system, space group P21/c(# 14), a = 1.2714(4) nm, b = 0.9411 (3) nm, c = 1.5869(4) nm, β= 108.54(2)°, V= 1.8001(9) nm3, Z = 2. The main feature of the crystal structure is a symmetric binuclear unit made up of two slightly distorted coordination octahedrons, which are bridged by TCB in monodentate fashion to each metal ion. Moreover three nitrogen atoms from three imidazoles, three oxygen atoms from two water molecules and one carboxylate group of TCB coordinated to a nickel (I) ion are found on a face of the octahedron respectively, so the octahedron is a facial isomer.
Catalytic Performance and Characterization of Pt‐Co/Al2O3 Catalysts for CO2 Reforming of CH4 to Synthesis Gas
Authors: Huang Chuan‐Jing , Zheng Xiao‐Ming , Mo Liu‐Ye , Fei Jin‐Hua 
Published: September 2010

AbstractPt‐Co/Al2O2 catalyst has been studied for CO2 reforming of CH4 to synthesis gas. It was found that the catalytic performance of me catalyst was sensitive to calcination temperature. When Co/Al2O3 was calcined at 1473 K prior to adding a small amount of Pt to it, the resulting bimetallic catalyst showed high activity, optimal stability and excellent resistance to carbon deposition, which was more effective to the reaction than Co/Al2O3 and Pt/Al2O3 catalysts. At lower metal loading, catalyst activity decreased in the following order: Pt‐Co/ Al2O3 > Pt/Al2O3 > Co/Al2O3. With 9% Co, the Co/Al2O3 calcined at 923 K was also active for CO2 reforming of CH4, however, its carbon formation was much more fast man that of the Pt‐Co/Al2O3 catalyst. The XRD results indicated that Pt species well dispersed over the bimetallic catalyst. Its high dispersion was related to the presence of CoAl2O4, formed during calcining of Co/Al2O3 at high temperature before Pt addition. Promoted by Pt, Co/Al2O4 in the catalyst could be reduced partially even at 923 K, the temperature of pre‐reduction for the reaction, confirmed by TPR. Based on these results, it was considered that the zerovalent platinum with high dispersion over the catalyst surface and the zerovalent cobalt resulting from Co/Al2O4 reduction are responsible for high activity of the Pt‐Co/Al2O3 catalyst, and the remain Co/Al2O4 is beneficial to suppression of carbon deposition over the catalyst.
Study of the Crystal Structure of Oxo‐bridged Binuclear FeIII Complex with Chiral Salen Ligand
Authors: Liu Tao , Ruan Qin‐Xuan , Zhu Zhi‐Ang Wen‐Juan , Chen Yun‐Ti , Chan Albert S. C. 
Published: September 2010

AbstractA oxo‐bridged binuclear iron complex with chiral salen ligand [Fe2L2]O (H2L = R, R'‐N, N'‐bis (3,5‐di‐tert‐butylsalicylaldene)‐1, 2‐cyclohexanediamine) has been synthesized and the structure has been determined by X‐ray diffraction analysis. The title complex crystallizes in triclinic system with space group P‐1. Crystal data: a = 1.42555(14) nm, b = 1.54889 (15) nm, c = 1.83662 (17) run, = 103.873(2)°, β = 100.506(2)°, 7=101.840(2)°, V = 3.7371 nm3, Dc = 1.082 g/cm3 and Z = 2. In the complex, each iron center is penta‐coordination and in distorted square‐pyramidal environment. Two Fem atoms are intramolecularity bridged by an oxygen atom with Fe‐Fe nonbond distance of 0.3517(3) nm.
Preparation, Crystal Structure and Spectroscopic Studies of Mixed valence Compound [(Cp4i Rh)2 (μ‐Cl)3] [Rh(CO)2Cl2]
Authors: Xu You‐Feng , Pang Zhen , Chen Ming‐Qin 
Published: September 2010

Abstract[(Cp4i Rh)2(μ‐Cl)3] [Rh(CO)2Cl2] (Cp4i = tetraisopropyl‐cyclopenta‐dienyl) has been prepared and its crystal is in the space group of Pbar with a= 0.9417 (8), b = 1.4806 (3), c = 1.5062 (2) nm, a = 92.980(10), β = 97.42(3), γ = 93.98 (3)°, V = 2.0735(18) nm3 and Z = 2. The crystal structure consists of a cation of [(η5‐Cp4i) Rh (III)(μ‐Cl)3 Rh (III) (η5‐Cp4i)]+ and an anion of [Rh (I) (CO)2 Cl2]. The two bulky tetraisopropylcyclopentadienyl ligands are in the ecliptic conformation with angle of 10.19° between two cyclopentadienyl ring planes.
Several Organic Salts with High Two‐Photon Active
Authors: Tian Yu‐Peng , Yu Wen‐Tao , Fang Qi , Jiang Min‐Hua , Wang He‐Zhou 
Published: September 2010

AbstractSeveral organic salts with D‐A molecular structure and different counterion have been prepared and experimentally investigated. The two‐photon induced frequency‐upconverted spectra and two‐photon pumped lasing are measured for the organic salt solutions in various solvents. The results indicate that counterions have influence on their stability and lasing property.
A Novel Conversion of 2, 4‐Diaryl‐2, 3‐dihydro‐1 H‐1, 5‐benzodiazepines into 2, 4‐Diaryl‐3 H‐1, 5‐benzodiazepines
Authors: Zhang Qi‐Han , Xu Jia‐Xi 
Published: September 2010

AbstractA novel conversion of 2, 4‐diaryl‐2, 3‐dihydro‐1 H‐1, 5‐benzodiazepins into 2, 4‐diaryl‐3 H‐1, 5‐benzodiazepines by the reaction with m‐chloroperbenzoic acid (MCPBA) was reported.
Synthesis of Titanium (IV) Complexes with Schiff‐base Ligand and Their Catalytic Activities for Polymerization of Ethylene and Styrene
Authors: Yong Li , Huang Ji‐Ling , Lian Bing , Yan ‐Long Qian 
Published: September 2010

AbstractReaction of titanium (IV) isopropoxide with the unusual land of Shiff‐base in 1:1 molar ratio gives a variety of new derivatives of titanium (IV) in high yield. These complexes were characterized by elemental analyses, IR, MS and 1H NMR. It was noteworthy to find that all these complexes were active for polymerizations of ethylene and styrene when activated by a Lewis acid cocatalyst (MAO).
Molecular Structures of Dibromo[(E)2‐bromo‐2‐phenylvinyl]‐(phenyl) tellurium (IV) and Dibromo [(Z)‐2‐bromo‐2‐phenyl‐vinyl] (p‐tulyl) tellurium (IV) hydrate methanolate
Authors: Lu Wei‐Min , Wang Ya‐Pin , Huang Xian , Sun Jie 
Published: September 2010

AbstractThe structures of title compounds, [TeBr2(C8H6Br)(C6H5)] (I) and [TeBr2(C8H6Br)(C7H9)](H2O)(CT3OH) (II), have been determined by X‐ray diffraction. The structures confirm that E‐ or Z‐type configuration of vinylic telluride depends on the polarity of solvent employed. In either structure, Te atom is in a trigonal dipyramide configuration with the lone pair of electrons in the equatorial position.
Zinc Transfer Kinetics of Metallothioneins and Their Fragments with Apo‐carbonic Anhydrase
Authors: Huang Zhong‐Xian , Liu Fang , Zheng Qi , Yu Wen‐Hao 
Published: September 2010

AbstractThe zinc transfer reactions from Zn7‐MT‐I, Zn7‐MT‐II, Zn4‐α fragment (MT‐I) and Zn4,‐α fragment (MT‐II) to apo‐carbonic anhydrase have been studied. In each reaction, no more than one zinc ion per molecule is involved in metal transfer. Zn7‐MT‐I and Zn7‐MT‐II donate zinc to apo‐carbonic anhydrase andde novoconstitute it at a comparable efficiency, while Zn7‐MT‐II exhibits a little faster rate. Surprisingly, Zinc is released from Zn4‐α fragment (MT‐II) with a much faster rate than from Zn4‐α fragment (MT‐I), whose rate is close to that of Zn7‐MT‐I. The reason for the difference is still unknown. Introducing complex compounds into this system may give rise to an effect on the reaction. The transfer from Zn7‐MT‐II in the presence of reduced glutathione shows little difference compare to the control, suggesting that the reduced glutathione is not involved in zinc transfer process. However, glutathione disulfide does accelerate this zinc transfer reaction remarkably, indicating that the oxidative factors contribute to zinc release from metallothioneins.
A Study on Some Copper (II) Complexes of Polyaza Cryptands and Planar Macrocycles—Synthesis, Characterization and Superoxide Dismutase Activity
Authors: Gao You‐Liang , Shen Cheng‐Yu , Tang Yin‐Yan , Luo Qin‐Hui , Yu Shu‐Yan 
Published: September 2010

AbstractTwo kinds of macrocyclic copper(II) complexes were synthesized. One of them is composed of copper(II) cryptates of ligands L1‐L4 which are condensation products of 5‐R‐2‐methoxy‐1,3‐phenyldialdehyde (R=OCH3, L1) with tris(2‐aminoethyl) amine and 5‐R‐2‐methothoxy‐1, 3‐phenyldialdehyde (R= CH3, L3) with tris(2‐aminopropyl)amine as well as their reduced products of L1 and L3 (L2 and L4). The other is composed of two‐dimensional macrocyclic copper(II) complexes of ligands L5‐L8 of condensation products of diethylene triamine with 4‐R‐l‐methoxy‐2,6‐phenyldialdehyde (R= Cl, Br. CH3, OCH3). The relationship between their structures and superoxide dismutase (SOD) activity was investigated. The results can provide some clues to the synthesis of SOD mimics.