Synthesis and Crystal Structure of Palladium(Ⅱ) Complex with 2,2’-Bipyridine-3,3’-dicarboxylic Acid

1 INTRODUCTION As the first inorganic antitumor complex[1], cis- platin (cis-DDP) possesses prominent therapeutic ef- fect for encephaloma, lung cancer and several kinds of genital system tumors[2]. However, cis-DDP has toxic side-effect to a larger extent. Especially due to its damage to kidney, the dose is strictly limited[3]. Therefore, other Pt(II) complexes including carbon- platin were developed[4]. Pd(II) complex is struc- turally similar to Pt(II) complex, so the antitumor …     

Molecular Dynamics Simulation of Glucomannan Solution

1 INTRODUCTION Konjac Glucomanan (KGM), found in konjac plant with molecular weight ranging from 2×105 to 2×106[1], is neutral polyoses with excellent water solubility. The structural studies of KGM have been well presented, but its accurate structure has not been clearly clarified so far, so the investigation is still in progress. According to the previous studies[2～4], the conjectural structure of KGM is as follows: KGM is natural polyoses formed by D-glucose and D-mannose link…     

STUDY ON THE DETERMINATION OF TRACE BISMUTH(Ⅲ) BY THIN-LAYER RESIN PHASE SPECTROPHOTOMETRY

In this paper, a new thin-layer ion-exchange resin phase analytical method is introduced. It is based on that, the bismuthous cation can associate with iodic anions, so as to formed an anioncomplex [BiI-4] in a strong acidic environments. This anion complex can also exchanges with a weaker anions on the surface active site of anion exchange resin, so that a [R+] [BiI-4] solid phase binary associational system is produced. Owing to the solid system is a great many dispersive particulates, it can be pressed to a thin-layer by press tools of the so called "thin-layer resin phase"or "resin phase ", and using this solid association system spectrophotometry for the determination of trace metals. So it can increase the analytical sensitivity. This association system exhibits maximum absorbance at 460nm, and obeys Beer's law over the concentration range 0. 01ug/ml～1.20ug/ml of bismuthous(Ⅲ). It has a molar absorptivity of 7.1 ×105 [L/mol cm]. It indicated the resin phase spectrophotometry is a sensitive analytical method for trace bismuthous. It is 18 times higher than routine aqueous spectrophotometry. The relative standard deviations is 1.82% (n=6) for the measurements of 0. 5ug/ml Bi(Ⅲ). The detection limit of Bismuthous(Ⅲ) is 1.4 ×10-8mol/L. The method has applied to the analysis Bi(Ⅲ) in environmental water samples.     

STUDY ON THE DETERMINATION OF TRACE BISMUTH（III） BY THIN-LAYER RESIN PHASE S PECTROPHOTOME TRY

In this paper, a new thin-layer ion-exchange resin phase analytical method is introduced. It is based on that, the bismuthous cation can associate with iodic anions, so as to formed an anion complex [BiI4-_] in a strong acidic environments. This anion complex can also exchanges with a weaker anions on the surface active site of anion exchange resin, so that a[R+] [Bil4-] solid phase binary associational system is produced. Owing to the solid system is a great many dispersive particulates, it can be pressed to a thin-layer by press tools of the so called “thin-layer resin phase “ or “resin phase “, and using this solid association system spectrophotometry for the determination of trace metals. So it can increase the analytical sensitivity. This association system exhibits maximum absorbance at 460nm, and obeys Beer‘s law over the concentration range 0.0lug/ml-l.20ug/ml of bismuthous(lll), h has a molar absorptivity of 7.1×l^5 [L/mol.cm]. it indicated the resin phase spectrophotometry is a sensitive analytical method for trace bismuthous. It is 18 times higher than routine aqueous spectrophotometry. The relative standard deviations is 1.82% (n=6) for the F fmeasurements of 0.Sug/ml Bi(llO. The detection limit of Bismuthous(lll) is 1.4 XlO~mol/L. The method has applied to the analysis Bi(lll) in environmental water samples.     

Quantum chemical study of chlorine-dissociation of oxalyl chloride (ClCO)_2→2Cl+2CO

It is very difficult to study the phenomenon that molecules are decomposed into several pho-tofragments by UV light, as the energy of lamp-house is insufficient. But the bond energy in oxa-lyl chloride is relatively low, for example, D0(ClCOCO-Cl) = 313.92 kJ/mol[1], D0(ClCO-CO) = 35.53 kJ/mol, and D0(Cl-CO) = 27.17 kJ/mol[2], so, oxalyl chloride, as a typical system for the study of multi-channel dissociation, can be dissociated into the four fragments Cl+Cl+CO+CO by the proper UV …     

Studies on the Hydrosilation of Aromatic Aldehydes

The dependence of reactivity on molecular structure in hydro-silation of aromatic aldehydes catalyzed by (PPh3)3 RhCl was studied by “IN SITU” FT-IR technique and a plausible mechanism was proposed.The results show that: (1) Model reaction Ⅰ, Ⅱ and Ⅲ are all characterized by an induction period; (2) The reaction constant of model reaction Ⅰ is +1.57, so the rare of reaction Ⅰ is increased by the electron-withdrawing groups; (3) The rate of model reaction Ⅲ decreases when the size of R1 becomes larger; (4) The reaction constant of model reaction Ⅲ is -0. 50, so the rate of it is increased by electron-donating groups.     

Tb(lll) and Ca(ll) Ion Equilibria in the Presence of Glutamic Acid and Glutamine

Bio1caica1effectSofmeartharecloselyrelathetOtheoriesofrareewth,sothestudiesonthesweiesofmorthareofereirtlei~tanCeL1,2J'Asacontinuationofourrerch[3j,inthiswrkweStodiedfo(ll1)andfa(ll)ionequilibriainthe~ceofglubeicacid(Glu)andglUhaire(Gln)at37tedanionicstwiofo.l5so1/L(HaCl)byPothetiwetrictithetion.PotentioretrictitrationnsWfedasforiforweviasly[3j.ffeorisentoldstswetreatedonmem386/the-terusingpeguze2[41.theoouilibeiainthestudiedsySteasandcorreSPOndingnOtetionfOrthestabi1ityconsthetSaregiv…     

1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and High Stability:Preparation and Photocatalytic Activity

The polyoxometalate(POM)-imidazole ionic liquid(IL) [C8mim]2[Mo6O19](C8mim=1-methyl-3-octylimi- dazolium) with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B(RB) in aqueous solution under the UV...     

IMMOBILIZATION OF Saccharomyces Cerevisiae USING POLY(ACRYLAMIDE)GEL FOR ASYMMETRIC SYNTHESIS OF R(-)-MANDELIC ACID

1. INTRODUCTIONPoly(acrylamide) hydrogel (PAAm gel), which is able to swell, but cannot be dissolved in the aqueous environment, is a three-dimension network with repeating hydrophilic units -CONH2. Since PAAm gel has a good biocompatibility as well as a high mechanical strength, and can be easily separated from reaction medium, PAAm gel has often been employed to immobilize enzymes and cells so as to catalyze various of chemical and biochemical reactions [1,2]. So far, biosynthesis …     

Synthesis and Structure of the Copper(I) Complex Containing Bis(diphenylphosphino)ethane

1 INTRODUCTION Procedures to synthesize copper(I) complexes are of great interest because of the diversity of products resulting from almost the same methodology. It has long been known that four-electron-donor diphosphine compounds Ph2P(CH2)nPPh2 are excellent bidentate ligands[1]. The chelating tendency decreases as the chain length increases, so that for the ligands Ph2P(CH2)nPPh2, the tendency to chelation is the greatest for bis(diphenylphosphino)ethane. Copper(I) displays wide…     

INVESTIGATION ON PRODUCTION OF REFINED BRINE USED IN CHLORO-ALKALI MEMBRANE BY CHELATING RESIN D412

1. INTRODUCTION Alkali production by ionic membrane is a new technology. Refining used-brine by chelating resin was reported [1~8]. Zhang et al reported the study of using chalating resin D411 to refine used-brine from alkali production by ionic membrane. Restricted by equipment and technology, in cholro-alkali plant the brine alkalinity is very high (pH>11), so conventional method cannot make the concentration of iron ions in used-brine to meet standard. So far there is no report on th…     

Molecular simulation of alkyl monolayers on the Si(111) surface YUAN

The preparation of monolayers on silicon surface is of growing interest for potential applica-tions in biosensor or semiconductor technology[1—5]. The alkyl modified Si(111) surfaces[6—10] can be obtained using the thermal, catalyzed, or photochemical reaction of hydrogen-terminated sili-con with alkenes, Grignard reagents, and so on. At the same time, the monolayer properties on Si(111) surface have been studied by a variety of experimental methods[8—10] such as X-ray photo-electron spect…     

Hydrothermal Synthesis and Crystal Structure of a Hybrid Compound Based on β-Octamolybdate [Mn(2,2’-bipy)_3]_2[β-Mo_8O_(26)]·4H_2O

1 INTRODUCTION Polyoxometalates (POMs) are one of the most widely used inorganic components due to their at- tractive electronic and molecular properties with va- rious applications in catalysis, medicine, materials science[1～3] and so on. Exploration of transition me- tal complex cations as well as organic component which functions as ligand as building blocks in the construction of metal oxide composite materials is a fruitful strategy[4, 5]. Among the polyoxometalates studied to dat…     

Synthesis and Crystal Structure of [Ni(bdpm)_2(OAc)]_2(N_3)_2·5H_2O(bdpm=Bis(3,5-dimethylpyrazol-1-yl)methane,OAc=CH_3COO~-)

1 INTRODUCTION Bis(pyrazol-1-yl)methane has been one of the po- pular polydentate nitrogen donor ligands due to its strong chelating coordination to transition metal ions as capping ligand. Coordination behavior of the li- gand is able to yield stable M-N-N-C-N-N six-mem- bered boat conformation[1, 2]. The complexes con- taining bdpm ligand have been widely synthesized and characterized in recent years, and exhibit the striking properties in catalysis, magnetism and so on[3-10]. For exa…     

STUDY ON LONG CHAIN BRANCHING IN POLYBUTADIENES BY GPC COUPLED WITH CAPILLARY VISCOMETER

The long chain branching of polybutadienes (PB) was measured with gel permeation chroma-tography coupled to an automatically recording capillary viscometer. In this method the experimentalrelation [η] (V) was translated into the calibration curve [η] (V_R) for the monodisperse species. The curve is combined with the universal calibration so that the molecular weight distributionand an additional parameter, e.g. the average branching factor of this samples may be obtained. Longchain branching molecular weight changes with polyemerization conditions.     

Cluster—cracking Reaction,a New Method to Synthesize Unsymmetrical Dithiolate Complexes for the Study of Third—Order Nonlinear Optical Properties

A new coluster-cracking method to synthesize dithiolate metal complexes was reported and four unsymmetric complexes with formula(Me4N)2[M(Ln)(SPh)2](M=Cd and Zn,L1=dmit=1,3-dithiole-2-thione4-5,dithiolate,L2=dmid=1,3-dithiole-2-one-4,5-dithiolate,SPh=thiophenolate)(1-4)were characterized by elemental analysis,IR,UV NMR spectra and so on.The advantages of this method are summarized in two aspects:(1) the preparation is very convenient;(2) the reaction usually completed giving the product with high pruity.The crystal structure of 1 showed that the bond distances of Cd(Ⅱ）to the sulfur of the thiophenolate group are shorter than those of Cd(Ⅱ）to the sulfur of dmit,so that the thiophenolate group does not be replaced in the reaction and thmixed ligand complexes are the dominant produxts.The dmit complexes showed well third-order NLO properties,but not of the dmid complexes,although dmid is an analogue to dmit.     

Comparison of two thioxopeptide bond photoswitches in insect kinin

<正>The photoisomerization abilities of secondary thioxopeptide bond(CS-NH) and thioxo prolyl bond(CS-N) incorporated into the C-terminal pentapeptide of insect kinin were compared.H-Phe-Phe-Ψ[CS-NH]-D-Ala-Trp-Gly-NH_2 and H-Phe-Tyr-Ψ[CS-N]- Pro-Trp-Gly-NH_2 were studied by UV-vis absorption.The isomerization energy barriers of the two segments,Ac-Phe-Ψ[CS-NH]- D-Ala-NH_2 and Ac-Tyr-Ψ[CS-N]-Pro-NH_2 picked from the two peptides,were calculated using ab initio method.The cis isomer of CS-N is more stable than that of CS-NH due to higher energy barrier,so the former is more suitable in peptide structure-activity relationship studies.     

Synethesis and Crystal Structure of Bi(ethylenediamine)copper Tetracyanonickelate(Ⅱ)

The crystal structure of the title compound C8H16CuN8Ni has been determined by single crystal X-ray diffraction. The crystal is triclinic with space group P1, a=6.494(3), b=7.270(4), c=7.936(5) .A, α=106.67(3), β=91.33(4), γ=106. 80(6)°, V=341. 3(3) A3, Z==1, Mr=346. 54, F(000)=177, μ=2. 933mm-1, Dc= 1. 686 Mg/m3. The final R factor is 0. 0603 for 1214 unique ob24- served reflections [I≥2σ(I)]. The structure consists of [Cu(en)2]2+ (eh=ethylenedi amine) cations and [Ni(CN)4]2- anions linked together by two of the CN groups (the remaining two act as unidentate ligands) to form infinite chains, in the chain, the hy between the interchains also exist, with distances of 3. 160 and 3. 124 A , so it forms a three-dimensional structure of the title compound.     

A NOVEL APPROACH TO SYNTHESIZE CHITOSAN BEADS CROSSLINKED BY EPICHLOROHYDRIN

1. INTRODUCTION Chitosan is the deacetylated chitin which is one of the most abundant natural polymers produced from crab, lobster and shrimp shells or fungal fermentation processes [1]. It is a family of deacetylated β1→4 D-glucosamine polymers. Chitosan has properties including bioactivity, biocompatibility and biodegradability, so it is potentially more useful than cellulose for developing advanced of attention not only as an unutilized biomass resource but also as a novel type of sp…     

Synthesis and Crystal Structure of [Cu(acac)(Hdmpz)_3]Br.EtOH

1 INTRODUCTION Diazoles have both a pyridine-type nitrogen and a pyrrole-type nitrogen (imino group), so they can act as bifunctional groups to coordinate with many metal ions or Lewis acids giving a variety of products[1, 2]. Recently researches on the pyrazole ligand have been focused on the following three sections. (i) The first is that the ligand acts as a bridged ligand and coordinates to metal forming di- and polynuclear complexes. Such system arouses much interest mainly because o…