THE POLYMERIZATION OF ACETYLENE BY COORDINATION CATALYSTS COMPOSED OF NEODYMIUM COMPOUND, ALUMINUM TRIALKYL AND A THIRD COMPONENT

This paper describes the polymerization of acetylene by coordination catalysts composed ofvarious neodymium compounds, (Nd (P_(204))_3; Nd (P_(507))_3; Nd (NO_3)_3 3P_(350); Nd (BA)_3.2H_2O; andNd (acac)_3.2H_2O), aluminum trialkyl and an electron donor. The catalysts show fairly high catalyticactivity and high cis stereospecificity on acetylene polymerization at 30℃.     

STUDY ON THE SECOND HARMONIC GENERATION OF SOME LANTHANIDE(Ⅲ) COORDINATION COMPOUNDS

The measurements of second harmonic generation efficiencies of some coordination compounds of lanthanide(Ⅲ) carboxylates and β-diketonates have been reported. The results show thatmost of lanthanide cinnamate have SHG activity.     

THE SYNTHESIS AND CHARACTERISTICS OF THE COORDINATION COMPOUNDS OF 2-MERCAPTOPYRIDINE-1-OXIDE WITH THE FIPST TRANSITION SERIES METALS

The stability of the coordination compounds of the first transitionseries metal ions(Mn(Ⅱ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ)and Zn(Ⅱ))with 2-mercaptopyridine-1-oxide is reported.A coordination compound CoL_2 is synthesized and characterizedfor the first time.     

N-ARYLATION OF AZOLE COMPOUNDS

Ｎ－ＡＲＹＬＡＴＩＯＮＯＦＡＺＯＬＥＣＯＭＰＯＵＮＤＳ￥ＺｈｉＳｈｅｎｇＪＩＡ；ＤｉＬｕｎＹＡＮＧ；ＹｏｕＣｈｅｎｇＬＩＵ（ＤｅｐｏｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＴｈｅＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｆＡｐｐｌｉｅｄＯｒｇａｎｉｃＣｈｅｍ...     

COORDINATION COPOLYMERIZATION OF STYRENE WITH MALEIC ANHYDRIDE BY RARE-EARTH COORDINATION CATALYSTS

The study on coordination copolymerization of styrene (S) with maleic anhydride (MA) by rare-earth coordination catalysts, NdL_3-Al(i-Bu)_3, has been successfully carried out for the first time. Some features, kinetic behavior, and mechanism of the SMA copolymerization by Nd(naph)_3-Al(i-Bu)_3 system are described and discussed. The copolymex of styrenemaleic anhydride prepared by the NdL_3-Al(i-Bu)_3 systems in benzene at 50℃ is an alternating-rich white powder having high number-average molecular weight of 6—8.5×10~5. The overall activation energy for the polymerization was found to be 10.5KJ/mol. The polymerization was not suppressed by addition of hydroquinone. The catalytic activity of various ligands in NdL_3 for the copolymerization decreases in the following order: Nd (naph)_3>Nd-(P_(507))_3～NdCl_3-6H_2O>Nd(P_(204))_3>Nd(acac)_3. 3H_2O. The experimental results are explained based on a mechanism to be the coordination-type copolymerization in terms of the participation of a monomer-monomer c     

STUDY ON THE STRUCTURES OF COORDINATION COMPOUNDS OF N-(ortho-METHYL)-AND N-(ortho-METHOXY)-PHENYL IMINODIACETATO-Cu(Ⅱ)

The coordination compounds,{Cu[CH_3C_6H_4N(CH_2COO)_2]}.2H_2O and{Cu[CH_3OC_6H_4N(CH_2COO)_2]}.2H_2O,have been prepared and its crystal struc-tures determined.The final discrepancy factors are R=0.052,R_w=0.061 for(I)and R=0.052,R_w=0.039 for(Ⅱ).The geometry of the coordination poly-hedron with Cu(Ⅱ)is a distorted tetragonal pyramid for(Ⅰ)and an unsym-metrical and extended tetragonal bipyramid for(Ⅱ),respectively.The re-sults of EHMO calculations indicate that the ligand mainly provided thefield with very few of its electrons being coordinated to the central atom.     

DETERMINATION OF STABILITY CONSTANTS OF THE COORDINATION COMPOUNDS OF Au(Ⅲ)-2-MERCAPTOPYRIDINE-1-OXIDE AND METHYL DERIVATIVES——METHOD OF DUAL-WAVELENGTH CORRESPONDING SOLUTIONS

In this paper,we report the deductive formula used for the methodof dual-wavelength corresponding solutions under condition of having ligandinterference and the stability constants of three new coordination compounds[AuL_2]~+determined with this method.The stability of the three compounds,thenecessity of controlling pH in experimental systems and the advantage of thismethod are discussed in detail.     

RUTHENIUM COORDINATION COMPOUNDS WITH POLYPYRIDINES V．DNA－BINDING STUDIES OF Ru（Ⅱ）COORDINATION COMPOUNDS WITH（2－PHENYL－）IMIDAZO［f］1，10－PHENANTHROLINE

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SOLID STATE PHOTOREACTION OF N-HETERO-CYCLIC COMPOUNDS

Photochemical reactions of 3-methylindole,carbazole,benzimidazole with fusedpolycyclic aromatic hydrocarbons in solid state were investigated,The structures of 4 newcompounds were confirmed by IR,UV,\+1HNNR,MS and elemental analysis.The structure of compounds 3.6was established by X-ray crystallography.     

SYNTHESES OF TETRAHEDRAL METAL CLUSTER COMPOUNDS

The carbyne compound [Br(CO)_2(Py)_2Mo(≡CC_6H_5)] (Py=pyridine) (1a) reacts with Co_2 (CO)_8, Fe_2(CO)_9 and Mn_2 (CO)_(10) to give tetrahedral tri-metal cluster compounds Co_2Mo(μ_3-CC_6H_5)Br(CO)_8(Py)_2 (2), Fe_2Mo(μ_3-CC_6H_5) Br(CO)_9(Py)_2 (3) and Mn_2Mo(μ_3-CC_6H_5)Br(CO)_(10) (Py)_2 (4) respectively. Tri-metal cluster compound Co_2Mo(μ_3-CC_6H_5)Br(CO)_8-(bipy) (bipy=α,α'dipyridyl) (5) is prepared in a similar reaction sequence from [Br(CO)_2(bipy)Mo(≡CC_6H_5)] (1b) and Co_2(CO)_8. IR, ~1H and ~(13)C NMR spectral data of these compounds are reported and discussed. The crystal structure of compound (5) has been determined by X-ray diffraction.     

STRUCTURAL RULES OF TRANSITIONMETAL CARBONYL COMPOUNDS

In this article we have proposed two topological rules to account for the electronic structures of transition-metal carbonyl compounds. The second rule is applied to those which have polyhedral metalhc skeletons with triangular faces and their derivates, while the first rule is applied to all the others We have used these two rules to analyze 261 structure-known compounds with the number of metal atoms from 2 to 12, and the results show that the two rules are in good agreement with the experimental facts. Furthermore, we have also derived from the second rule a formula which can be used to account for the electronic structures of closedpacking carbonyl compounds and which is the same as that given by Ciani and his coworkers.     

COORDINATION POLYMERIZATION OF BENZOTRIAZOLE ON THE SURFACE OF METALLIC COPPER

The coordination polymerization of benzotriazole with metallic copper has been investigated by infrared and X-ray photoelectron spectroscopies. We found that benzotriazole could react with copper (0) under mild conditions to form bis (benzotriazolato) copper (Ⅱ) and benzotriazolato copper (Ⅰ)which covered the surface of copper metal in the shape of polymeric materials. Since benzotriazole is of great interest as a ligand in that its presence in many biological system with metal ions, and is considered as a corrosion inhibitor, this work will be in favour of the study of protective corrosion.     

SYNTHESIS AND CHARACTERIZATION OF SOLUBLE POLYPHENYLENE COMPOSED OF p-PHENYLENE AND m-PHENYLENE UNITS

NiCl_2(bpy) catalyzed polycondensation between p-dibromobenzene and m-dibromobenzene has been carried outunder vdrious conditions. The polycondensation endows the copolymer with an M_n of 2300 (by GPC, polystyrene standards)and good solubility in organic solvents. The fluorescence spectra of the copolymer measured with tetrahydrofuran solutionshows an emission maximum (λ_(max)) at 372.8 nm, whereas for the film the maximum shifts to 436.6 nm.     

RUTHENIUM COORDINATION COMPOUNDS WITH POLYPYRIDYL：Ⅱ THE INTERACTION OF RUTHENIUM（Ⅱ）MIXED－LIGAND COORDINATION COMPOUNDS CONTAINING PYRIDO［3，2－f］［1，7］PHENANTHROLINE WITH CALF THYMUS DNA

ＲＵＴＨＥＮＩＵＭＣＯＯＲＤＩＮＡＴＩＯＮＣＯＭＰＯＵＮＤＳＷＩＴＨＰＯＬＹＰＹＲＩＤＹＬ：ⅡＴＨＥＩＮＴＥＲＡＣＴＩＯＮＯＦＲＵＴＨＥＮＩＵＭ（Ⅱ）ＭＩＸＥＤ－ＬＩＧＡＮＤＣＯＯＲＤＩＮＡＴＩＯＮＣＯＭＰＯＵＮＤＳＣＯＮＴＡＩＮＩＮＧＰＹＲＩＤＯ［...     

PREPARATION OF ULTRAFINE METAL PARTICLES FROM COORDINATION POLYURETHANES

ＰＲＥＰＡＲＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＭＥＴＡＬＰＡＲＴＩＣＬＥＳＦＲＯＭＣＯＯＲＤＩＮＡＴＩＯＮＰＯＬＹＵＲＥＴＨＡＮＥＳ￥ＬｅｉＣＨＥＮ；ＣｈａｎｇＺｈｅｎｇＹＡＮＧ；ＸｕｅＨａｉＹＵ（ＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｓｔｒｙａｎｄＣｈｅｍ...     

EFFECT OF IONIC RADII ON UNIT-CELL VOLUMES OF ISOSTRUCTURAL COMPOUNDS

The relation between cell-edges or unit-cell volumes of isostructural compounds and theionic radii has wide applications in crystal chemistry. The authors have proved: (1) For a series of multiple isostructural compounds such as A_mB_n…X_p, when the anionand other cations are fixed, there exists the following relation between the unit-cell volume Vand the radius r_A of a certain cation such as A: V = (a + br_A)(r_X + r_A)~3 (a and b are constants). (2) For binary isostructural compounds A_mX_p, the above relation is reduced to V = k(r_X + r_A)~3 (k is a constant). (3) For binary isostructural compounds the relation between V and r_A~3 is approximatelylinear, and for multiple compounds, it is often curvilinear but still approximately linear whenthe variation of r_A is slight. As another approximation, a linear relation also exists betweenV and r_A for isostructural compounds. (4) The relation of ce1l-edge a vs. r_A is linear for binary isostructural compounds. Butno such a good linear relation exists fo     

SELECTIVE INDIRECTIVE ELECTROOXIDATION OF THE SIDE CHAIN OF AROMATIC COMPOUNDS

This paper describes the indirect electrooxidation of the side chain of aromatic com.pounds with a Ce(Ⅳ)/Ce(Ⅲ)redox system.The reaction has the following advantages:favourableselectivity,high yield,nonpollution and economy.     

STEREOSPECIFIC POLYMERIZATION OF ACETYLENE BY RARE-EARTH COORDINATION CATALYSTS

This paper is the first study on the stereospecific polymcrization of acetylene by coordination catalysts based on rare-earth compounds. High cis (80-100%) polyacetylene films with silvery metallic appearance were obtained at 30℃ or 0℃ in the presence of rare-earth catalysts composed of two or three components: naphthenates or 2-ethyl hexyl phosphonates of all fifteen rare-earth elements, trialkyl aluminum and/or a third component. The resultant polyacetylene has been characterized using techniques of infrared spectrophotometry, differential scanning calorimetry, electron spin resonance, X-ray diffraction, scanning electron micrography and electrical resistivity measurements.     

THE SYNTHESIS OF NEW BENZODIAZEPINIC TRICYCLIC COMPOUNDS

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