The reaction of VO（acac）2 with 2-hydroxyl-1-naphthaldehyde isonicotinyl hydrazone and amines （ethylenediamine or diethylenetriamine） in CH3OH yields crystals of novel vanadium compounds characterized by IR, NMR sp...The reaction of VO（acac）2 with 2-hydroxyl-1-naphthaldehyde isonicotinyl hydrazone and amines （ethylenediamine or diethylenetriamine） in CH3OH yields crystals of novel vanadium compounds characterized by IR, NMR spectroscopic methods and X-ray single-crystal structure determination. Two different vanadium units exist in the crystal cell of [VO2（C17H11N3O2）][VO- （C4H13N3）（C6H5N3O）]（C2H5OH） which crystallizes in the triclinic system, space group P1 with a = 8.0104（17）, b = 13.898（3）, c = 14.955（3）A, α = 89.103（4）, β = 79.551（4）, γ = 78.352（4）°, V = 1603.3（6）A^3, Mr = 723.54, Dc = 1.499 g/cm^3, Z = 2, λ（MoKα） = 0.71073 ]A,μ= 0.644 mm^-1, F（000） = 748, the final R = 0.0547 and wR = 0.0997 for 8920 observed reflections with I 〉 2σ（I）. According to structure analysis, two different molecules are arranged in the lattice and the two vanadium atoms adopt octahedral and square pyramidal coordination geometries, respectively. The interactions between DNA and vanadium complexes have been investigated by UV-Vis absorption spectro- photometry.展开更多
Urea can be sorbed by coordination （or complexation）with transitional metalpolyacrylic acid complex and transitional metal-polyacrylamide containing polyethylenepolyamine ligand complexes. The experimental results i...Urea can be sorbed by coordination （or complexation）with transitional metalpolyacrylic acid complex and transitional metal-polyacrylamide containing polyethylenepolyamine ligand complexes. The experimental results indicate that the sorbents can sorb about 60mg urea per gram of sorbent at 37℃ and the concentration of urea was 1300.0rag/1 in NaH<sub>2</sub>PO<sub>4</sub> and Na<sub>2</sub>HPO<sub>4</sub> buffer solution （pH=7.0） and the urea sorption capacity was affected by many factors such as other competive ligands, sorption time, pH and the concentration of urea.展开更多
In this paper, using the Strong Rooted Theorem of complex polynomial systems we prove the existence of global general solutions of a class of complex polynomial systems, discuss the qualitative structure of global gen...In this paper, using the Strong Rooted Theorem of complex polynomial systems we prove the existence of global general solutions of a class of complex polynomial systems, discuss the qualitative structure of global general solutions of normal polynomial systems, and obtain their representation theorem. Finally, we give some applications of the theorem.展开更多
<正> Ⅰ. INTRODUCTION The transition metal carbene compound with olefin ligand is an important intermediate in the metathesis of olefin, cyclopropanation of alkenes and Ziegler-Natta Polymerization of olefin. Th...<正> Ⅰ. INTRODUCTION The transition metal carbene compound with olefin ligand is an important intermediate in the metathesis of olefin, cyclopropanation of alkenes and Ziegler-Natta Polymerization of olefin. The synthesis and structure of the展开更多
基金the Scientific Research Common Program of Beijing Municipal Commission of Education, PRC (KM200510028005)
文摘The reaction of VO（acac）2 with 2-hydroxyl-1-naphthaldehyde isonicotinyl hydrazone and amines （ethylenediamine or diethylenetriamine） in CH3OH yields crystals of novel vanadium compounds characterized by IR, NMR spectroscopic methods and X-ray single-crystal structure determination. Two different vanadium units exist in the crystal cell of [VO2（C17H11N3O2）][VO- （C4H13N3）（C6H5N3O）]（C2H5OH） which crystallizes in the triclinic system, space group P1 with a = 8.0104（17）, b = 13.898（3）, c = 14.955（3）A, α = 89.103（4）, β = 79.551（4）, γ = 78.352（4）°, V = 1603.3（6）A^3, Mr = 723.54, Dc = 1.499 g/cm^3, Z = 2, λ（MoKα） = 0.71073 ]A,μ= 0.644 mm^-1, F（000） = 748, the final R = 0.0547 and wR = 0.0997 for 8920 observed reflections with I 〉 2σ（I）. According to structure analysis, two different molecules are arranged in the lattice and the two vanadium atoms adopt octahedral and square pyramidal coordination geometries, respectively. The interactions between DNA and vanadium complexes have been investigated by UV-Vis absorption spectro- photometry.
文摘Urea can be sorbed by coordination （or complexation）with transitional metalpolyacrylic acid complex and transitional metal-polyacrylamide containing polyethylenepolyamine ligand complexes. The experimental results indicate that the sorbents can sorb about 60mg urea per gram of sorbent at 37℃ and the concentration of urea was 1300.0rag/1 in NaH<sub>2</sub>PO<sub>4</sub> and Na<sub>2</sub>HPO<sub>4</sub> buffer solution （pH=7.0） and the urea sorption capacity was affected by many factors such as other competive ligands, sorption time, pH and the concentration of urea.
基金Project supported by the National Natural Science Foundation of China.
文摘In this paper, using the Strong Rooted Theorem of complex polynomial systems we prove the existence of global general solutions of a class of complex polynomial systems, discuss the qualitative structure of global general solutions of normal polynomial systems, and obtain their representation theorem. Finally, we give some applications of the theorem.
基金Project supported by the National Natural Science Foundation of China
文摘<正> Ⅰ. INTRODUCTION The transition metal carbene compound with olefin ligand is an important intermediate in the metathesis of olefin, cyclopropanation of alkenes and Ziegler-Natta Polymerization of olefin. The synthesis and structure of the
