Effects of Y(Ⅲ) Ions on the Fluorescence Properties of Ce(Ⅲ) Ion and the Organic Ligands in the Comp

ＥｆｆｅｃｔｓｏｆＹ（Ⅲ）ＩｏｎｓｏｎｔｈｅＦｌｕｏｒｅｓｃｅｎｃｅＰｒｏｐｅｒｔｉｅｓｏｆＣｅ（Ⅲ）ＩｏｎａｎｄｔｈｅＯｒｇａｎｉｃＬｉｇａｎｄｓｉｎｔｈｅＣｏｍｐｌｅｘＬＩＷｅｎ－ｌｉａｎ．（ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ...     

Synthesis,Crystal Structure and Electrochemistry Properties of an Iron(Ⅲ) Complex Based on the 3,5-Pyridinedicarboxylate and Water Ligands

Reaction of 3,5-pyridine-dicarboxylic acid(3,5-PydcH2) with iron salt in hydrothermal condition results in the formation of a three-dimensional self-assembly network formulated as [C14H14Fe2N2O12]n,and it has been structurally characterized by elemental analysis,IR spectra and X-ray diffraction.It crystallizes in the monoclinic system,space group C2/c with a=9.9633(15),b=12.0942(18),c=7.4297(11) and β=105.822o.The units of Fe2(pydc)2·2H2O are linked into a one-dimensional structure via the chelate carboxylate groups from the 3,5-pyridine-dicarboxylate.The interlayer hydrogen bonding interactions result in a three-dimensional supramolecular architecture.In the complex,the Fe(Ⅲ) ion displays a slightly distorted pentagonal bipyramidal geometry with seven coordination numbers.Cyclic-voltammetry measurement reveals the oxidation and reduction processes for the complex are quasi-reversible in nature.     

Synthesis,Structure, Fluorescence and Magnetic Properties of a New Binuclear Cobalt (Ⅱ) Complex Containing Three Kinds of Ligands

A new binuclear cobalt(Ⅱ) complex, [Co_2(C_(10)H_6NO_2)_2(C_(12)H_8N_2)_2(N_3)_2]·H2_O(1, C_(10)H_6NO_2~-: isoquinoline-1-carboxylate, C_(12)H_8N_2: 1,10-phenanthroline(phen); N_3~-: azide), has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as solvent. The complex was characterized by elemental analysis, IR spectrum and single-crystal X-ray diffraction. It crystallizes in triclinic system, space group P1 with Z = 2, a = 1.777(5), b = 11.815(5), c = 17.141(7) ?, α = 74.496(6)°, β = 70.537(6)°, γ = 67.861(6)°, V = 2055.4(14) ?~3, Mr = 922.66, Dc = 1.491 g/cm~3, λ = 0.71073 ?, μ = 0.870 mm~(-1), F(000) = 942, R = 0.0455 and wR = 0.1147 for 4960 observed reflections with I 2σ(I) and S = 1.129. Its molecular structure is constructed by two Co~(2+) cations, two chelating phen ligands, two chelating isoquinoline-1-carboxylate ligands, two bridging linear azide anions and two uncoordinated half-occupied water molecules. The 3-D supramolecular network results from the multiple hydrogen bonds and π-π stacking interactions among three types of ligands. More importantly, its thermal stability, luminescent properties and magnetic properties have also been studied in detail.     

Synthesis, Crystal Structure and Thermal Stability of a Saturated Dimeric Ce(Ⅲ)-chelated Complex Based on Benzoate and 1,10-Phenanthroline Ligands

The title complex, [Ce(BA)3phen]2 (BA = benzoate, phen = 1,10-phenanthroline),was prepared by the reaction of Ce(NO3)3·6H2O, benzoic acid and 1,10-phenanthroline. The complex was characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra and TG-DTG techniques. The results show that the crystal is of triclinic, space group P(1) with a =10.912(2), b = 11.962(3), c = 12.474(3)(A), a = 104.889(3), β = 93.523(3), γ = 113.332(3)°,C66H46Ce2N4O12, Mr = 1366.90, V= 1420.2(6) (A)3, Z = 1, Dc = 1.598 g/cm3,μ = 1.652 mm-1, S =1.024 and F(000) = 682. The final R = 0.0391 and wR = 0.0947 for 4878 observed reflections with I ＞ 2σ(1). The structure of the title complex consists of two Ce(C6H5COO)3(C12H8N2) units,forming a binuclear molecule. Each Ce(Ⅲ) is coordinated by two O atoms of one bidentate chelating carboxylate group, five O atoms of two bidentate bridging and two tridentate chelating-bridging carboxylate groups, and two N atoms of one 1,10-phenanthroline molecule to complete a distorted monocapped square antiprism geometry. Its thermogravimetric analysis was determined by TG-DTG techniques.     

Crystal Structure and Properties of a Copper(Ⅱ) Complex Containing p-Toluenesulfonate and Imidazole Ligands

A novel supramolecular mixed ligand complex of formula [Cu(PTS)2(Him)2(H2O)2] (C20H26CuN4O8S2,PTS=p-toluenesulfonate,Him=imidazole) has been synthesized in aqueous solution and characterized by elemental analysis,IR and single-crystal X-ray diffraction.The compound crystallizes in the monoclinic system,space group P21/n,Z=2,a=5.650(2),b=14.671(3),c=14.638(3),β=100.10(3)°,V=1194.60(4)3,Dc=1.607 g/cm3,μ(MoKα)=1.143 mm-1,F(000)=598,R=0.0615 and wR=0.1503 for 1752 observed reflections with I 2σ(I).The copper(II) ion in the complex adopts a slightly distorted octahedral coordination geometry and is six-coordinated with N2O4 donor set consisting of two nitrogen atoms and four oxygen atoms provided by the ligands of two imidazole molecules,two water molecules and two p-toluenesulfonate ions.The sulfonate group of the PTS ligand remains weak-coordinated and forms a number of hydrogen bonds with water molecules and imidazole ligands.X-ray structural analysis reveals that the coordination molecules are connected to form a 3-D supramolecular framework by electrostatic interaction,weak van der Waals forces,hydrogen bonding and π-π interaction.The thermal behaviour of the title complex was investigated by using DSC and TG-DTG techniques.     

Synthesis, Structure and Thermochromic Properties of a Copper(Ⅱ) Complex Based on Naphthyl Carboxylate and Benzimidazolyl Ligands

One novel copper(Ⅱ) complex, [Cu(NAA)2(bim)2]·H2O (1, HNAA = a-naphthylacetic acid, bim = benzimidazole) has been synthesized and characterized by X-ray single-crystal diffraction analysis, elemental analysis, and IR spectrum. It crystallizes in monoclinic, space group C2/c with a = 1.15969(12), b = 1.9757(2), c = 1.45763(16) nm, β = 104.712(2)°, V = 3.2298(6) nm3, Z = 4, C38H32N4O5Cu, Mr = 688.22, Dc = 1.418 g/cm-3, μ = 0.729 mm-1, S = 1.039, F(000) = 1428, the final R = 0.0380 and wR = 0.0912 for 2849 unique reflections. In 1, two carboxylate and two benzimidazole ligands coordinate to the central Cu(Ⅱ) atom by a bidentate chelate mode. Interesting, reversible thermochromic properties of 1 can be observed and investigated by thermal analysis method.     

Theoretical Study on the Mass Transfer of Metal Ions in Ion Exchange Process

The kinetics of ion exchange between Ca2 , Mg2 , Co(Ⅱ), Cu(Ⅱ),Ni(Ⅱ), Fe(Ⅲ), y3 or Sm3 , respectively, in 0.50 mol/L HC1 and H on macrorecticular sulfonic ion exchange resin and the kinetics of the same reactions (M -H exchange) when Mn(Ⅱ) coexisted in resin phase as accelerating ion were studied. The accelerating effect manifested and its rule are consistent with the accelerating effect theory based on the concept concerned with adsorption electrical double layer which has been suggested in a previous paper published.     

Effects of Self-coiling of Organic Molecules on Intramolecular Exciplex Formation and Fluorescence Quenching in DX-H_2O Solvent System

ＩｎｔｒｏｄｕｃｔｉｏｎＨｙｄｒｏｐｈｏｂｉｃ ｌｉｐｏｐｈｉｌｉｃｉｎｔｅｒａｃｔｉｏｎｓ (ＨＬＩ)ｐｌａｙａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｃｈｅｍｉｃａｌａｎｄｂｉｏｃｈｅｍｉｃａｌｐｒｏｃｅｓｓｅｓｓｉｎｃｅｗａｔｅｒｉｓｔｈｅｃｏｍｍｏｎｍｅｄｉｕｍｉｎｐｈｙｓｉｏｌｏｇｉｃａｌｐｒｏ ｃｅｓｓｅｓ.1 4 Ｓｏｍｅｒｅｃｅｎｔｅｆｆｏｒｔｓｈａｖｅｂｅｅｎｄｅｄｉｃａｔｅｄｔｏｓｔｕｄｉｅｓｏｆｈｙｄｒｏｐｈｏｂｉｃｅｆｆｅｃｔｓｏｎｐｈｏｔｏｃｈｅｍｉｃａｌａｎｄｐｈｏ ｔｏｐｈｙｓｉｃａ…     

Synthesis,Fluorescence and Magnetic Properties of a New Europium(Ⅲ) Complex Eu(L)_3(Phen)_2

A new europium(III) complex Eu(L)3(Phen)2(1) with 2-benzoylbenzoic acid(HL) and 1,10-phenanthroline(Phen) as ligands has been synthesized. Crystal data for the complex are as follows: monoclinic, space group P21/c, a = 2.2577(4), b = 1.23484(19), c = 1.8789(3) nm, β = 94.918(3)o, V = 5.2189(14) nm~3, Dc = 1.512 g/cm~3, Z = 4, μ(Mo Kα) = 1.269 mm~(-1), F(000) = 2408, the final R = 0.0433 and w R = 0.1038. The Eu(III) ion is coordinated by nine atoms to give a single-capped square antiprism coordination geometry. 1 shows two intense fluorescence emission bands arising from the transitions of Eu~(3+): ~5D_0→~7F_1(597 nm) and ~5D_0→~7F_2(615 nm) with an excitation wavelength of 396 nm. In addition, 1 displays antiferromagnetic property at low temperature.     

Studies on Synthesis of a Cycloheptapeptide and Effects of Different Metal Ions on the Cyclization

ＩｎｔｒｏｄｕｃｔｉｏｎＣｙｃｌｉｃｐｅｐｔｉｄｅｓ ,ｗｈｉｃｈａｒｅｃｏｎｓｔｒａｉｎｅｄｃｏｎｆｏｒｍａ ｔｉｏｎａｌｌｙａｎｄｍｏｒｅｒｅｓｉｓｔａｎｔｔｏｐｒｏｔｅａｓｅｄｉｇｅｓｔｉｏｎｓｔｈａｎｔｈｅｉｒｌｉｎｅａｒｐｒｅｃｕｒｓｏｒｓ ,ｈａｖｅｂｅｅｎｏｆｇｒｅａｔｉｎｔｅｒｅｓｔａｓｓｙｎｔｈｅｔｉｃｔａｒｇｅｔｓｂｏｔｈａｓｐｏｔｅｎｔｉａｌｄｒｕｇｌｅａｄｓａｎｄａｓｍｏｄｅｌｓｆｏｒｃｏｎ ｆｏｒｍａｔｉｏｎａｌａｎａｌｙｓｉｓ .1 4 Ｃｕｒｒｅｎｔｍｅｔｈｏｄｓｆｏｒｓｙｎｔ…     

Impact of Zn(Ⅱ) Ions on Crystallization and Thermal Properties of Poly(lactic acid)

The issues of low crystallinity and slow crystallization rate of poly(lactic acid) (PLA) have been widely addressed. In this work, we find that doping PLA with Zn(Ⅱ) ions can speed up the process of crystallization of PLA. Three kinds of Zn(Ⅱ) salts (ZnCl\begin{document}$ _2 $\end{document}, ZnSt and ZnOAc) were tested in comparison with some other ions such as Mg(Ⅱ) and Ca(Ⅱ). The increased crystallinity and crystallization rate of PLA doping with Zn(Ⅱ) are reflected in FT-IR and variable temperature Raman spectroscopy. The crystallinity is further confirmed or measured with differential scanning calorimetry and X-ray diffraction. The crystallinity rate of the PLA/ZnSt-0.4 wt% material can reach 22.46% and the crystallinity rate of the PLA/ZnOAc-0.4 wt% material can reach 24.83%, as measured with differential scanning calorimetry.     

Hydrothermal Preparation and Photophysical Properties of a Ni(Ⅱ) Complex Containing Quinoline Derivative and Phen Ligands

A novel nickel complex[Ni_2L_2Phen_3]·3H_2O (HL=3-hydroxy-2-methylquioline-4-carboxylic acid)has been synthesized by a hydrothermal approach and is structurally determined by single-crystal X-ray diffraction.The title complex crystallizes in triclinic space group ■.Crystal data for the title complex:C_(58)H_(44)N_8Ni_2O_9,M_r=1108.35,a=11.8648(4),b=12.7369(4),c=17.0728(5)?,α=97.694(3),β=96.702(2),γ=99.566(3)°,V=2495.66(14)?~3,Z=2,T=293(2) K,D_c=1.475 g/cm~3,μ(Mo Kα)=0.824 mm~(–1),F(000)=1140,R=0.0757,w R=0.2129 and GOF=1.017.The nickel ions are surrounded by five oxygen and six nitrogen atoms to yield two slightly distorted octahedral geometries.Solid-state photoluminescence spectrum reveals that it shows blue purple emission.Solid-state UV/Vis diffuse reflectance spectroscopy exhibits that it has an optical band gap of 1.702 e V.     

Synthesis and Properties of Dinuclear Europium(Ⅲ)Complex Containing 2-Benzoylbenzoic Acid

A new europium(Ⅲ)complex[Eu2(C14H9O3)6(2,2'-bipy)2]·(2,2'-bipy)2 has been synthesized with 2-benzoylbenzoic acid and 2,2'-bipyridine as ligands.Crystal data:tri...     

Syntheses and Properties of Tripicolinatechromium (Ⅲ)

Chromium (Ⅲ) has been implicated as glucose tolerance factor (GTF) in the maintenance of normal lipid and carbohydrate metabolism^[1]. Several organic chromium (Ⅲ) complexes containing nicotinate, amino acids ligand which have much higher biological activity than chromic chloride have been synthesized and extensively studied^[2]. Tripicolinatechromium (Ⅲ) as a new human chromium(Ⅲ) nutritional supplement was shown to reduce the symptoms of diabetes, hyperglycemia and cholesterol significantly^[3]. Although the crystal structure and NMR spectrum of tripicolinatechromium (Ⅲ) was studied previously^[4,5], Its properties have only received little attention. In this paper, we report the studies of syntheses and properties of tripicolinatechromium(Ⅲ).     

Structures and Photoluminescent Properties of 3D Ho(Ⅲ) and Y(Ⅲ) Complexes with 2,4,6-Pyridinetricarboxylate

Two 3D rare earth coordination polymers {[Ho(ptc)(H_2O)_(2.5)]·0.5 H_2O}n(1) and {[Y2(ptc)2(H_2O)_5]·H_2O}n(2)(H_3ptc = 2,4,6-pyridinetricarboxylic acid) have been synthesized with Ho(Ⅲ) or Y(Ⅲ) chloride and H_3ptc by hydrothermal method. The X-ray structure analyses display the two complexes are isomorphic and crystallize in monoclinic crystal system with P21/n space group for 1 and P21/c space group for 2. Ho(Ⅲ) and Y(Ⅲ) both show two different coordination modes. One is nine-coordinated and forms a distorted tricapped trigonal prism and the other is eight-coordinated to get a distorted bicapped trigonal prism. The ptc3-also shows two different coordination modes by connecting four or three rare earth ions. The photoluminescent properties of 2 show that it can emit blue fluorescence at 440 nm with excitation at 335 nm. The fluorescence lifetime of 2 is 1.64 μs and the absolute fluorescence quantum yield is 10.2%.     

Synthesis,Crystal Structure and Fluorescence Properties of a Terbium(Ⅲ) Complex with Biphenyl-2,3,3',5'-tetracarboxylic Acid

A new terbium complex based on biphenyl-2,3,3',5'-tetracarboxylic acid(H_4bptc) has been synthesized, {[Tb(Hbptc)(H_2O)_4]×H_2O}n(1). Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analyses. Title complex crystallizes in monoclinic, space group P21/n with a = 14.090(2), b = 8.0824(13), c = 15.5591(17) ?, V = 1775.4(5) ?~3, Mr = 576.22, D_c = 2.156 g/cm3, μ(Mo Kα) = 4.059 mm~(-1), F(000) = 1128, Z = 4, the final R = 0.027 and w R = 0.0726 for 3296 observed reflections(I 2σ(I)). Complex 1 exhibits a 2 D layer structure, and such layers are further united together into a three-dimensional supramolecular structure through π···π interaction and intricate hydrogen bonding. The fluorescence excitation and emission spectroscopy of 1 showed that H4 bptc is a kind of highly efficient sensitizer for terbium(Ⅲ) ion. The title complex also displays efficient ligand sensitized luminescence in the visible region with long lifetime of 2.02 ms in the solid state.     

Effects of Samarium on the Properties of the Anodic Pb(II) Oxides Film Formed on Pb in Sulfuric Acid Solution

ＩｎｔｒｏｄｕｃｔｉｏｎＡｎｔｉｍｏｎｙ ｆｒｅｅＰｂ Ｃａａｌｌｏｙｓｈａｖｅｃｏｍｍｏｎｌｙｂｅｅｎｕｓｅｄｉｎｔｈｅｍａｎｕｆａｃｔｕｒｅｏｆｇｒｉｄｓｉｎｏｒｄｅｒｔｏｍｉｎｉｍｉｚｅｇａｓｓｉｎｇｉｎｅｉｔｈｅｒｌｏｗ ｍａｉｎｔｅｎａｎｃｅｏｒｖａｌｖｅ ｒｅｇｕｌａｔｅｄｌｅａｄａｃｉｄｂａｔｔｅｒｉｅｓ .Ｈｏｗｅｖｅｒ ,ｔｈｅｓｅａｌｌｏｙｓｃａｎｃａｕｓｅｏｔｈｅｒｐｒｏｂｌｅｍｓｓｕｃｈａｓｐｒｅｍａｔｕｒｅｃａｐａｃｉｔｙｌｏｓｓ ,ｌｏｗｃｈａｒｇｅ ａｃ ｃｅｐｔａｎｃｅａｎｄ…