bluuebunny/crossref_metadata_2025_split huggingface dataset:
Intrinsic Surface Reaction Constant in 1‐pK Model of Mg‐Fe Hydrotalcite‐like Compounds
Authors: Hou Wan‐Guo , Han Shu‐Hua , Li Dong‐Xiang , Zhang Gao‐Yong 
Published: September 2010

AbstractThe relationship among intrinsic surface reaction constant (K) in 1‐pK model, point of zero net charge (PZNC) and structural charge density (σst) for amphoteric solid with structural charges was established in order to investigate the effect of σst on pK. The theoretical analysis based on 1‐pK model indicates that the independent PZNC of electrolyte concenmtion (c) exists for amphoteric solid with structural charges. A common intersection point (CIP) should appear on the acid‐base titration curves at different c. and the pH at the CIP is pHPZNC. The pK can be expressed as pK=‐pHPZNC+log[(l+2αPZNC)/(1–2αPZNC)], where α‐PZNC σ/eNANs, in which e is the elementary charge, Na the Avogadro's constant and NS the total density of surface sites. For solids without structural charges, pK=‐ pHPZNC. The pK values of hydrotalcite‐like compounds (HTlc) with general formula of [Mg1‐x Fex(OH)2](Cl, OH)x were evaluated. With increasing x. the pK increases, which can be explained based on the affinity of metal cations for H− or OH− and the electrostatic interaction between charging surface and H− or OH−.
An Efficient Synthesis of [1, 2, 4]Triazolo[3, 2=d][1, 5]benzoxazepin‐2‐thiones, a Kind of Novel Tricyclic O, N‐Heterocycles
Authors: Li Zheng , Meng Qing‐Qing , Wang Quan‐Rui , Tao Feng‐Gang 
Published: September 2010

AbstractA series of novel tricyclic O, N‐heterocycles, [1, 2, 4]triazolo[3.2‐d][1, 5]benzoxazepin‐2‐thiones 7 were achieved via acid‐induced ring closure of the geminal arylazo isothiocyanate compounds 5 which were derived from substituted chroman‐4‐ones. followed by feasible ring expansion with simultaneous insertion of the nitrogen atom into the carbon skeleton. The X‐ray crystal structure of 7d was also described.
Two Typical Examples of Scaling Ionic Partition Scheme for Estimating Correlation Energy of A2 Type Molecules
Authors: Zhuo Shu‐Ping , Si Wei‐Jiang , Wei Ji‐Chong , Ju Guan‐Zhi 
Published: September 2010

AbstractBased on the calculation results of pair correlation energy contributions of the various electron pairs in Naz and H2NNH2 systems and the application of the scaling ionic partition scheme for symmetrical A2 type systems, the total correlation energies of Na2 and H2NNH2 have been reproduced by using this simple scheme. The two results show that the absolute deviations are within an acceptable range of mr, however, in this way, more than 90% of computational work can be. saved. The most attractive result in present paper is that, in these two molecules the coefficients c1 and c2 in the estimation equation can be obtained by the proportion of correlation energy of A− to that of A+ singlet system. Therefore, it is believed that the proposed ionic partition scheme for symmetrical A2 molecules would be very useful to estimate the correlation energies of large symmetrical molecules.
IR and Raman Vibrational Assignments for Metal‐free Phthalocyanine from Density Functional B3LYP/6‐31G(d) Method
Authors: Zhang Xian‐Xi , Bao Meng , Pan Na , Zhang Yue‐Xing , Jiang Jian‐Zhuang 
Published: September 2010

AbstractVibrational (IR and Raman) spectra for the metal‐free phthalocyanine (H2Pc) have been comparatively investigated through experimental and theoretical methods. The frequencies and intensities were calculated at density functional B3LYP level using the 6‐31G(d) basis set. The calculated vibrational frequencies were scaled by the factor 0.9613 and compared with the experimental result. In the IR spectrum, the characteristic IR band at 1008 cm−1 is interpreted as C—N (pyrrole) in‐plane bending vibration, in contrast with the traditional assigned N—H in‐plane or out‐of‐plane bending vibration. The band at 874 cm−1 is attributed to the isoindole deformation and aza vibration. In the Raman spectrum, the bands at 540. 566, 1310, 1340, 1425, 1448 and 1618 cm−1 are also re‐interpreted. Assignments of vibrational bands in the IR and Raman spectra are given based on density functional calculations for the first time. The present work provides valuable information to the traditional empirical assignment and will be helpful for further investigation of the vibration spectra of phthalocyanine analogues and their metal complexes.
Ab Initio and Density Functional Study on the First Hyperpolarizabilities of Squaric Acid Homologues
Authors: Fu Wei‐Wei , Zhou Li‐Xin 
Published: September 2010

AbstractThe first hyperpolarizabilities of four squaric acid homologues: squaric acid, 1, 2‐dithiosquaric acid, 1, 2‐diselenosquaric acid and 1,2‐ditellurosquaric acid have been calculated using ab initio and DFT methods. The effects of equilibrium geometries. basis set and electron correlation on the first hyperpolarizabilities of these molecules were investigated. The frequency dispersion effect and solvent effect, which are essential to get reliable outputs in comparison to the experimental results, have also been explored. On the basis of these investigations, it is worthy to point out that the heavy atom effect takes effect for these squaric acid homologues.
Synthesis, Characterization and Crystal Structure of (Z)‐1‐[2–(Triarylstannyl)vinyl]‐1‐indanols and Their Arylhalostannyl Derivatives
Authors: Zhu Dong‐Sheng , Lu Chun‐Sheng , Mei Ze‐Min , Gao Wei , Zhang Yue‐Tao , Mu Ying , Wang Zong‐Mu 
Published: September 2010

Abstract(Z)‐1‐[2‐(Tri‐o‐tolylstannyl)vinyl]‐l‐indanol(1) and (Z)‐1‐[2‐(tri‐p‐tolylstannyl)vinyl]‐l‐indanol (2) were synthesized by the addition reaction of l‐ethynylindanol with tri‐o‐tolyltin and m‐p‐tolyltin hydride. The aryl groups in compound 1 and 2 were substituted by Br2 or I2 to yield monohalide derivatives (3–6). The compounds 1–6 were characterized by elemental analysis, 1H NMR and FT‐IR spectroscopy. The crystal structures of 1, 2 and 4 have been determined by single crystal X‐ray diffraction analysis. The Sn atom in 1 and 2 exhibits a tetrahedral geometry distorted towards trigonal bipyramid due to a weak intramolecular interaction between Sn and the hydroxyl O atoms [02839(4) nm and 0.2744(5) nm], while the Sn atom in 4 adopts a trigonal bipyramidal geometry with a significant 0→Sn(1) interaction [0.2552(5) nm].
Synthesis, Characterization and Two‐Photon Absorption Properties of a Novel Pyridinium Salt
Authors: Hao Fu‐Vinga , Shi Peng‐Fei , Liu Hui‐Jun , Wu Jie‐Mng , Yang Jia‐Xiang , Tian Yu‐Peng , Zhou Guang‐Yong , Jiang Min‐Huk , Kun Hoong Fun , Suchada Chantraptomma 
Published: September 2010

AbstractA novel pyridinium salt, 2,4‐bis[p‐(N,N‐dimethylamino)styryl]‐N‐methyl pyridinium iodide (BMSPI) was synthesized and characterized by TG, 1H NMR spectroscopy and elemental analysis. and the reaction process was studied by Using ES‐MS. When BMSPI was pumped by a pulsed 1064 nm, 50 ps laser him. it manifests highly efficient TPA (Two‐Photon Absorption) and up‐conversion superradiance. The up‐conversion efficiency was 6.0% at the pump energy of 4–6 mJ and the Lifetime of two‐photon fluorescence was measured as 59 ps.
A Valuable Synthetic Route to the Enantiopure Functionalized N‐Substituted Aziridines
Authors: Li Sen‐Lan , Guo Jin‐Bo , Yu Zhao‐Uan , Chen Qing‐Hua 
Published: September 2010

AbstractChiral butyrolacto[3,4‐b]‐2(S)‐6(R)‐l‐N‐alkylaziridines 7 were synthesized in enantiopure form utilizing racemic 5‐methoxy‐3‐bromo‐2(5H)furanone (5) and available amines (6) as key precursors. After highly effective reduction of 7, the functionalized 2(S),3(R)‐dihydroxymethyl‐N‐alkylaziridines (8) were obtained in good yields with ≥98% ee. This is a simple and practical method for the preparation of enantiopure aziridines which are important intermediates in the synthesis of biologic active molecules.
Synthesis of Schiff Base‐type Liquid Crystalline Crown Ethers Containing Dibenzo‐18‐Crown‐6 Unit
Authors: Zhang Shu‐Yuan , He Ke‐Ke , Zheng Shi‐Jun , Tang Si‐Fu , Zhang Xiao‐Jing , Li Zi‐Fa 
Published: September 2010

AbstractThe synthesis and characterization of novel Schiff base liquid crystalline crown ethers prepared from the intermediates 4‐(4′‐alkoxylbiphenyl‐4‐carbonyl) benzaldehyde, cis‐ and trans‐4,4′‐diaminodibenzo‐18‐crown‐6 are described. The structure of these compounds have been well characterized by elemental analysis, IR, 1H NMR and MS spectroscopy. The liquid‐crystalline behavior of these compounds was also investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) with a heating stage and polarimetric analysis.
Synthesis, Spectroscopic Properties and Crystal Structures of Dibenzyltin(IV)‐Dithiobenzoate and Chlorodibenzyltin(IV) Thiobenzoate
Authors: Yin Han‐Dong , Wang Chuan‐Hua , Ma Chun‐Lin , Fang Hai‐Xa 
Published: September 2010

AbstractTwo dibenzyltin(IV) complexes with thiobenzoate ligand, (PhCH2)2Sn(SOCPh)2 (1) and (PhCH2)Sn(Cl)SOCPh (2), have been synthesized by the reaction of dibenzyltin(IV) dichloride with thiobenzoic acid in the presence of organic base Et3N and characterized by IR, 1H NMR spectroscopy and elemental analysis. Their crystal structures were determined by X‐ray single crystal diffraction analysis. In the crystals of 1, the tin atom is six‐coordinated in a distorted octahedron configuration. In the crystals of 2, the molecular packing in unit cell reveals that the two adjacent molecules are symmetrically linked to each other to form a dimer with intermolecular Sn…Cl distances of 0.3591(2) nm and the tin atom is five‐coordinated in a distorted trigonal bipyramid configuration.
Homocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines
Authors: Li Qiang , Nie Juan , Yang Fan , Zheng Rui , Zou Gang , Tang Jie 
Published: September 2010

AbstractHomocoupling of aryl iodides catalyzed by cyclopalladated complexes of tertiary arylamines gives symmetric biaryls with good yields in DMA or ionic liquid [Bmim]BF4. This catalytic alternative of the Ullmann reaction has proved to be sensitive to both electronic and steric factors of substrates.
Density functional theory and MP2 calculations of the transition states and reaction paths on coupling reaction of methane through plasma
Authors: Yang En‐Cui , Zhao Xiao‐Jun , Tian Peng , Hao Jin‐Ku 
Published: September 2010

AbstractThe two possible reaction paths of producing ethane on coupling reaction of methane through plasma were theoretically investigated by B3LYP and MPF2 methods with 6‐311G* respectively and further compared with the previous results calculated from B3LYP/6‐31G*. The new investigated results consistently confirmed the previous conclusion. And the influences of the calculation methods and basis sets on the calculated results were also discussed.
Synthesis, crystal structures and characterization of Ba5LiTiNb9O30
Authors: Liu Han‐Xing , Zou Long , Zhou Jian , Fang Liang , Zhang Gao‐Ke , Ouyang Shi‐Xi 
Published: September 2010

AbstractA new niobate compound with the chemical composition of Ba5LiTiNb9O30 was synthesized by doping Li+ into the system BaO‐TiO2‐Nb2O5 in conventional solid state reaction method. The crystalline structure was determined by X‐ray dilation analysis (XRD). The results showed that crystal structure of Ba5LiTiNb9O30 belongs to tetragonal tungsten bronze structure with space group P4bm and its unit cell parameters: a=b= 1.2512(2) nm, c= 0.4008(5) nm. The microstructure of reaction products was observed by scanning electron microscopy (SEM).
Spectrofluorimetric determination of reduced glutathione using organic nanoparticle probes
Authors: Wang Le‐Yu , Wang Lun , Zhu Chang‐Qing , Dong Ling , Xia Ting‐Ting , Chen Hong‐Qi , Bian Gui‐Rong 
Published: September 2010

AbstractNanometer‐sized fluorescent particles (poly‐4‐vinylaniline nanoparticles) have been prepared under ultrasonic radiation. The fluorescence of poly‐4‐vinylaniline nanoparticles (PVN) is ca. 50 folds higher than that of 4‐vinylaniline. In comparison with single organic fluorophores, these nanoparticle probes are brighter, more stable against photobleaching, and do not suffer from blinking of light emission. A new fluorimetric method for the determination of reduced glutathione (GSH) has been developed with poly‐4‐vinylaniline nanoparticles as a probe. The maximal fluorescence for the reagent occurs at excitation and emission wavelengths of 306 and 380 nm, respectively. Under optimal conditions, PVN reacts with GSH and o‐phthalaldehyde (OPA) to give a highly fluorescent derivative in Na2CO3‐HCl buffer (pH= 10.55). The fluorescence excitation and emission wavelengths of the fluorescent derivative are located at 340 and 428 nm, respectively. The relative fluorescence intensity (RF) is linear in the range of the GSH concentration from 3.0 × 10−7 to 1.2 × 10−5 mol/L. The method has been applied to the determination of GSH in synthetic samples with satisfactory results.
Novel Rearrangement of Small Peptides in Electrospray Ionization Tandem Mass Spectrometry
Authors: Chen Yi , Wang Jin , Liu Xiao‐Hong , Sun Ming , Chen Jing , Jiang Yang , Zhao Yu‐Fen 
Published: September 2010

AbstractElectrospray ionization mass spectrometry (ESI‐MS) is a powerful method for sequencing peptides. A novel fragmentation pattern with the loss of a neutral fragment of 45 Da was observed with the dipeptides, tripeptides, tetrapeptides and pentapeptides containing phenylalanine or histidine residues. A novel rearrangement reaction with the extrusion of a formamide piece was studied and the rearrangement mechanism was proposed and confirmed by deuterium labeling experiments with ESI‐MS and high‐resolution mass spectrometry. These findings are potentially helpful in identifying the specific sequence pattern in the peptide sequencing.
Synthesis of Glutamic Acid‐based Cluster Galactosides and their Binding Affinities with Liver Cells
Authors: Zhang Xiao‐Ru , Li Ylng‐Xia , Chu Shi‐Dong , Ding Ning , Li Chun‐Xia , Guan Hua‐Shi 
Published: September 2010

AbstractStructurally well defined di‐, tri‐ and tetra‐valent cluster galactosides were synthesized in a convenient way. Oligo‐glutamic acids were assembled as scaffolds. The presence of amine groups in these three ligands is expected to couple with drugs or genes for delivery. The binding affinities of these cluster galactoses to liver cells were determined by in vitro binding studies. Among them. the tetravalent cluster galactose (19) showed the highest affinity to Liver cell. It is therefore a promising targeting device for the specific delivery of drugs or genes to parenchymal liver cells.
Studies on the Physicochemical Properties, Structure and Antitumor Activity of an Oligosaccharide Homologue SnS‐2 from the Root of Scrophularia ningpoensis Hemsl
Authors: Deng Jun‐E , Zhang Jian , Chen Xiao‐Ming , Ke Wei , Tian Geng‐Yuan 
Published: September 2010

AbstractAn oligosaccharide homologue named SnS‐2 was isolated from the root of Scrophularia ningpoensis Hemsl. SnS‐2 was purified by means of gel‐permeation chromatography and ion‐exchange chromatography. Its physico‐chemical properties, including carbohydrate content and molecular weight were determined. The structure of SnS‐2 was elucidated by chemical methods along with 1H and 13C NMR spectroscopy, including two‐dimensional DQCOSY and H‐detected 1H, 13C HMQC experiments. These. results show that SnS‐2 possesses a backbone consisting of terminal α‐Galp(1→, α‐Galp‐(1→6), α‐Glcp‐(1→6) and nonreducing end β‐Furf‐(2→. The bioactive assay showed that it could inhibit the growth of Lewis pulmonary carcinoma implanted in mice.
Synthesis and characterization of α‐hexadecyl‐DOTA and its Gd(III) chelate
Authors: Feng Zhi‐Ming , Li Feng , Lei Chun‐Hua , Chen Rong , Lixs Xiao‐Ru 
Published: September 2010

AbstractSynthesis and characterization of the ligand. 10‐(α‐hexadecylarboxyethyl)‐1,4,7,10‐tetraazacyclododecane‐1,4,7‐triacetic acid (H4L), and its Gd(III) chelate are described. Protonation constants for H4L (lg KiH = 10.52, 9.45, 4.74, 4.10) and the stability constant for GdL− (lg KGdL‐ =24.50) were determined by potentiometric titrations. The results obtained show that the ligand still maintains the strong chelating properties of the parent DOTA (1,4,7,10‐tetraazacyclododecae‐N,N′,N′'N′‐tetraacetic acid) after introduction of a linear chain hexadecyl group at the acetic side chain of DOTA, and its basicity is not significantly altered.
Quantum chemical study on a new mechanism of one‐carbon unit transfer reaction: The water‐assisted mechanism
Authors: Qiao Qing‐An , Cai Zheng‐Ting , Feng Da‐Cheng 
Published: September 2010

AbstractIt is a theoretical study on the water‐assisted mechanism of one‐carbon unit transfer reaction, in which the energy barrier for each aansition state lowered by about 80‐1100 kJ/mol when compared with the one in no‐water‐involved mechanism. The water‐assisted path 4 is the favorite reaction way. Our results well explained the presumption from experiments.
Studies on the adsorption of asymmetrical triblock copolymers by scheutjens‐fleer theory and monte carlo simulation
Authors: Peng Chang‐Jun , Li Jian‐Kang , Liu Hong‐Lai , Hu Ying 
Published: September 2010

AbstractThe adsorption of asymmetrical triblock copolymers from a non‐selective solvent on solid surface has been studied by using Scheutjens‐Fleer mean‐field theory and Monte Carlo simulation method on lattice model. The main aim of this paper is to provide detailed computer simulation data, taking A8‐kB20Ak as a key example, to study the influence of the structure of copolymer on adsorption behavior and make a comparison between MC and SF results. The simulated results show that the size distribution of various configurations and density‐profile are dependent on molecular structure and adsorption energy. The molecular structure will lead to diversity of adsorption behavior. This discrepancy between different structures would be enlarged for the surface coverage and adsorption amount with increasing of the adsorption energy. The surface coverage and the adsorption amount as well as the bound fraction will become larger as symmetry of the molecular structure becomes gradually worse. The adsorption layer becomes thicker with increasing of symmetry of the molecule when adsorption energy is smaller but it becomes thinner when adsorption energy is higher. It is shown that SF theory can reproduce the adsorption behavior of asymmetrical triblock copolymers. However, systematic discrepancy between the theory and simulation still exists. The approximations inherited in the mean‐filed theory such as random mixing and the allowance of direct back folding may be responsible for those deviations.
A three‐dimensional heteronuclear polymer of [Ag2Fe(SCN)5‐(DMF)]n containing channels and one‐dimensional Ag2S2‐S‐Ag2S2 chains with Ag…Ag interaction
Authors: Li Xiu‐Ling , Zhao Chang‐Chun , Chen Jiu‐Tong , Du Wen‐Xin 
Published: September 2010

AbstractThe Ag2S2 rings connect [Fe(NCS)5(DMF)]2‐ (DMF=N,N‐dimethylformamide) octahedrons by bridging thiocyanates leading to a 3‐D [Ag2Fe(SCN)5(DMF)]n framework. The Fe(III) atoms are in the octahedral geometry and Ag(1) atoms are in the distoned tetrahedral geometry. One‐dimensional Ag2S2‐S‐Ag2S2 wave‐like strand chains along the b‐axis and channels constructed from ten‐membered Ag2Fe(SCN)2S rings along the c‐axis feature the three‐dimensional framework. The Ag…Ag distance of 0.3103(1) nrn in Ag2S2 rings indicates weak Ag…Ag interaction. Such an Ag2S2‐S‐Ag2S2 chain in silver(I) complexes is unprecedented. Crystal data: M,=635.09, ortho‐rhombic, Pnma, a= 1.64214(13) nm, b= 1.40075(11) nm, c=0.84445(7) nm, V=1.9424(3) nm3, Z=4, μ(Mo Kα) =3.278 mm−1, Dcaled=2.172g × cm−3. F(000)= 1220, R1=0.0443, wR2=0.1138.
Structure of AcMet‐Gly and its interaction with palladium(II) tetraaqua complex studied by electrospray mass spectrometry and density functional theory
Authors: Jin Chen , Zhang Lin , Hong Jin , Yang Gao‐Sheng , Zhu Long‐Gen 
Published: September 2010

AbstractThe structure of dipepide AcMet‐Gly was determined by X‐ray crystallographic analysis. It possesses mono‐clinic, space group P21 (No. 4). with cell dimensions of α=0.8571(2) nm, b=0.5871(2) nm, c= 1.197(3) nm, β= 99.290(10)°. V=0.5944(15) nm3, Z=2, μ=2.74 cm−1. Mononuclear chelates, described as [Pd(X)(S,N,O‐AcMet‐Gly)]−, in which Pd(II) is coordinated by thioether, deprotonated amide nitrogen, carbonyl oxygen of me‐thionine and X (AcMetGly or other ligands present in aqueous solution or in mobile phase solution), were detected 5 min after mixing AcMet‐Gly with [Pd(H2O)4]2‐ at room temperature using electrospray ionization mass spectrometry. The geometry of [Pd(H2O)(S,N,O‐AcMet‐Gly)]− is optimized at density functional B3LYP/LanL2DZ level. The fused five‐ and six‐membered chelate is responsible for cleavage of Met‐Gly bond. This is the first time to provide a direct evidence for Pd(II)‐mediated cleavage of dipeptides via external solvent attack.
Cobalt(II) salen complex with two aza‐crown pendants and its analogues as synthetic oxygen carriers
Authors: Wei Xing‐Yue , Li Jian‐Zhang , Mao Zhi‐Hua , Zhou Bo , Qin Sheng‐Yingtn 
Published: September 2010

AbstractSalen with two aza‐crown ether pendants H2L1 and its analogues H2L2‐H2L4 were successfully synthesized starting from benzo‐10‐aza‐15crown‐5 (BN15C5) or morpholine. Their structures were characterized by IR, MS, 1H NMR and elemental analysis, and were confirmed by X‐ray diffraction analysis of H2L1. Moreover, the saturated oxygen uptake of their cobalt(II) complexes CoL1‐CoL4 in diethyleneglycol dimethyl ether was determined at different temperature. The oxygenation contants (KO2 ) and thermodynamic parameters (ΔH° and ΔS°) were calculated. The modulation of O2‐binding capabilities by pendant substituents were investigated as compared with the parent Schiff base complex CoL5 (CoSalen). The results indicate that the dioxygen affinities of CoL have been much more enhanced by aza‐crown pendants than that by morpholino pendants, and the O2‐binding capabilities of CoL1 and CoL2 with aza‐crown pendants would also be enhanced by adding alkali metal cations.
Synthesis, characterization and application of benzyl‐substituted cyclopentadienyl lanthanide complexes as catalyst precursors for the syndiotactic polymerization of methyl methacrylate
Authors: Qian Yan‐Long , Baia Muhammad , Xie Xiao‐Min D. , Huang Ji‐Ling 
Published: September 2010

AbstractBenzyl‐substituted cyclopentadienyl lanthanide complexes were synthesized and characterized by elemental analysis, MS and IR spectroscopy. The analytical data point out the formation of monomeric. unsolvated complexes. In conjunction with AI(Et)3as co‐catalyst. the title complexes are efficient catalysts for the syndiotactic polymerization of methyl methacrylate. For the complex (C6H5CH2C5H4)2YCl, under the optimum polymerization conditions (60 °C,n(MMA) :n(catalyst) :n(co‐catalyst)=1000 : 1 : 10), a predominantly syndiotactic (rr=66%) polymer of high molecular weight (Mn=105000) was obtained.
Syntheses of some new group 4 non‐Cp complexes bearing schiff‐base, thiophene diamide ligands respectively and their catalytic activities for α‐olefin polymerization
Authors: Huang Ji‐Ling , Lian Bing , Yong Li , Qian Yan‐Long 
Published: September 2010

AbstractTotally sixteen new titanium and zirconium non‐Cp complexes supported by Schiff‐base, or thiophene diamide ligands have been synthesized. The complexes are obtained by the reaction of M(OPT‐i)4 (M=Ti, Zr) with the corresponding Schiff‐base ligand in 1: 1 molar ratio in good yield. The thiophene diamide titanium complex has been prepared from trimethylsilyl amine [N,S,N] ligand and TiCl4 in toluene at 120 °C. All complexes are well characterized by 1H NMR, IR, MS and elemental analysis. When activated by excess methylaluminoxane (MAO), complexes show moderate catalytic activity for ethylene polymerization, and complex 1f (R1=CH3, R2=Br) exhibits the highest activity for ethylene and styrene polymerization. When the complexes were preactivated by triethylaluminum (TEA), both polymerization activities and syndiotacticity of the polymers were greatly improved.