Thermochemical Study on Coordination Complex of Samarium with Salicylic Acid and 8-Hydroxyquinoline

The coordination complex Sm（C7H5O2）2·（C9H6NO）, synthesized from the reaction of samarium chloride sixhydrate with salicylic acid and 8-hydroxyquinoline, was characterized with IR, elemental analysis, molar conductance, and thermogravimatric analysis. The standard molar enthalpies of solution of [ SmCl3·6H2O （s） ], [ 2C7H6O3 （s） ], [ C9H7NO （ s ） ] and [ Sm （C7H5O3） 2·（ C9H6NO ） （ s ） ] in the calorimetric solvent were determined with the solution-reaction isoperibol calorimeter at 298.15 K to be △sHm^- [ SmCl3·6H2O （s）, 298.15 K ] = - 103.98 ± 0.04 kJ·mol^-1, △sHm^- [2 C7H6O3 （s）, 298.15 K] = 16.35±0.14 kJ·mol^-1,△sHm^-[C9H7NO （s）, 298.15 K] = -6.11±0.08 kJ·mol^-1 and △sHm^-[Sm（C7H5O3）2·（C9H6NO） （s）, 298.15 K] = - 130.08 ± 0.04 kJ·mol^-1, respectively. The enthalpy was determined to be △rHm^- = 89.59 ±0.18 kJ·mol^-1 for the reaction SmCl3·6H2O（s） ＋ 2C7H6O3（s） ＋ C9H7NO（s） = Sm （C7H5O3） 2·（C9H6NO） （ s ） ＋ 3HCl （g） ＋ 6H2O （ l ）. According to the above results and the data given in literature and through Hess＇ law, the standard molar enthalpy of formation of Sin（ C7H5O3 ）2·（C9H7NO）（s） was estimated to be △rHm^- [ Sm （C7H5O3）2·（C9H6NO） （s）, 298.15 K] = - 2055.9 ± 3.03 kJ·mol^-1.

Preparation and Characterization of Carboxyl Functionalized Fluorescent Mesoporous Silica Nanoparticles Containing 8-Hydroxyquinolinate Zinc Complexes

Fluorescent mesoporous silica nanoparticles functionalized with carboxyl group(Znq-CMSCOOH) were successfully synthesized by in situ formation route of 8-hydroxyquinolinate zinc complexes in channels of mesoporous silica nanoparticles and post-grafting of carboxyl group on the surface. Moreover,the particle size and structural properties of Znq-CMS-COOH were characterized by transmission electron microscopy(TEM),field emission scanning electron microscopy(FE-SEM),dynamic light scattering(DLS),Fourier transform infrared spectroscopy(FT-IR),UV-vis spectrometer, fluorescence spectrometer and nitrogen adsorption-desorption measurements. The obtained results suggest that the Znq-CMS-COOH presents the uniform spherical shape with the mean diameter of about 85 nm and the obvious wormhole arrangement mesoporous. In addition, the Znq-CMS-COOH possesses green fluorescence with the emission peaks at 495 nm. So the Znq-CMS-COOH, which is beneficial to further modification and tracing, might be a great potential carrier for applying in drug delivery system in the future.

Crystal Structure and Characterization of a Binuclear Cd(Ⅱ) Quaternary Coordination Complex [Cd_2(phen)_2Q_2(BP)]_n(phen=1,10-Phenanthroline,BP = Biphenyl-4,4'-dicarboxylic acid,Q=8-Hydroxyquinoline Anion)

The structure of a binuclear cadmium（Ⅱ） quaternary complex, [Cd2（phen）2- Q2（BP）]n 1 （phen = 1,10-phenanthroline, BP = biphenyl-4,4′-dicarboxylic acid, Q = 8-hydroxy- quinoline-anion）, has been determined by X-ray crystallography and characterized by elemental analysis, IR spectrum and thermogravimetric analysis. It crystallizes in the monoclinic system, space group P21/n with a = 13.1906（18）, b = 10.9623（15）, c = 16.947（2）A, β = 111.3430（10）°, V = 2282.5（5）A^3, Z = 4, Mr = 556.85, Dc = 1.620 g/cm^3, F（000） = 1116,μ= 0.994 mm^-1 and S = 1.056. In the structure, 1D chains are connected via biphenyl-4,4′-dicarboxylic acid, 8-hydroxy quinoline anion and binuclear cadmium atoms into an infinite 1-D molecular chain architecture. Via aryl ring π-π stacking interactions a supramolecular structure is formed in 1.

ABSORPTION SPECTRA OF 4f ELECTRON TRANSITIONS OF NEODYMIUM COMPLEX WITH 8-HYDROXYQUINOLINE AND OCTYLPHENOL POLY(ETHYLENEGLYCOL)ETHER

In this paper the absorption spectra of 4f electron transitions of the neodymlum complex with 8-hydroxyquinoline and octylphenol poly(ethyleneglycol)ether have been studied. The marked intensification of the band at low octylphenol poly(ethyleneglycol)ether concentration is found normally at 575 nm, and its resolution into three sharp bands centering at 572, 580 and 584 nm. The absorbances of the absorption maxima are 3.5 (at 572 nm), 7.2 (at 580 nm) and 10.2 (at 584 nm) times greater than that of the chloride.

Synthesis and Structural Characterization of [Co(Q)_2(H_2O)_2](Q=8-Hydroxyquinoline Ion)

The single crystal of bi（8-hydroxyquinoline） bihydrated cobalt （Ⅱ） complex, [ Co（Q）2 （H2O2 ] （Q = 8-hydroxyquinoline ion）, has been synthesized by general method and structurally characterized by single crystal X-ray diffraction. Crystal data： C18H16CoN2O4, monoclinic, C2/c, α = 1.336 2（4） nm, b = 0.941 2（3） nm, c = 1.354 3（4） nm, β= 109.672（4）°, Z = 4. In the complex, Co（ Ⅱ ） ion is six-coordinated, forming a distorted octahedron. H-bonding and π-π stacking interaction play a significant role to form and stabilize the three-dimensional structure.

Ethylene Oligomerization to Low Carbon Olefins by a Zirconium Complex Incorporating 8-Quinolinolato Ligands at a Low Al/Zr Ratio

Bis(8-quinolinolato)zirconium dichloride (Ox)2ZrCl2 (Ox- = 8-quinolinolato) was found active for ethylene oligomerization with a high selectivity of 84~94% to C4~C10 olefins at 70~100C under the pressure of 1.8 MPa using Et2AlCl as a co-catalyst (Al/Zr = 60).

Synthesis and Characterization of 8-Hydroxyquinoline Derivative Containing a Triphenylamine Unit and Its Metal Complexes

A new 8-hydroxyquinoline derivative （5） was synthesized and characterized by ESI-MS, ^1H NMR spectroscopy, elemental analysis and IR spectroscopy. The photophysical properties of compounds 5, 6 and 7 were also detemined by UV-vis and FL spectroscopy. The vibrational frequency of ligand 5 predicted by using B3LYP method is in good agreement with experimentally determined values. The compositions of the corresponding copper（Ⅱ） and zinc（Ⅱ） complexes were confirmed to be Cu（C29H21N2·O）2,H2O （6） and Zn（C29H21N2O）2,H2O （7） by elementary analysis, thermogravimetry analysis and IR spectroscopy.

8-羟基喹啉两亲配合物的荧光性质

对８ － 羟基喹啉的１２ 个两亲配合物荧光性质进行了研究配合物荧光光谱的谱形与配体的相似，其发射带波长λｍａｘ 受金属离子的影响小，属于 Ｌ→ Ｌ 发光但其发射强度受金属离子的影响大，其中具有闭壳层电子结构的金属离子配合物的荧光要比具有开壳层电子结构的金属离子配合物强，并以 Ｃｄ Ｌ２ 为最大各配合物荧光发射强度的顺序按金属 Ｃｄ ＞ Ｍｇ ＞ Ｚｎ ～ Ｇｄ ＞ Ｌａ ～ Ｐｂ ＞ Ｍｎ ～ Ｃｏ ～ Ｎｉ～ Ｃｕ

A Tetranuclear Co(Ⅱ) Coordination Cluster with Thienyl-based Quinolinate Ligand and Nitrate Ligands:Syntheses,Structure and Magnetic Properties

One novel Co（II） coordination polymer, namely [Co4（L）6（NO3）2] （1） was prepared by solvothermal reactions of Co（NO3）2 with a （E）-2-[2-（3-thienyl）ethenyl]-8-quinolinol ligand （HL）, which has been determined by single-crystal X-ray diffraction analyses and further characterized by means of elemental analyses, IR spectra, PXRD and thermogravimetric analyses （TGA）. The core structure of complex 1 is an incomplete dicubane-like tetranuclear Co（II） cluster, which is surrounded by six 8-hydroxy-quinolinate-based ligands and two nitrate ligands. Weak S-O interactions between the thienyl groups and nitrate ligands extend the adjacent tetranuclear CoOI） clusters into a supramolecular （4, 4） net structure. Magnetic measurement indicates that the coupling within both molecules is overall antiferromagnetic.