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Xiangguang Yang - One of the best experts on this subject based on the ideXlab platform.
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iron ii 8 Quinolinol mcm 41 catalyzed phenol hydroxylation and reaction mechanism
Journal of Catalysis, 1997Co-Authors: Chibiao Liu, Yongkui Shan, Xiangguang YangAbstract:Iron(II)-8-quinolino/MCM-41 is prepared. Its catalysis is studied in phenol hydroxylation using H2O2 (30%) as oxidant. The experiment shows that Iron(II)-8-Quinolinol/MCM-41 has good catalytic activity and desired stability. Based on cyclic voltammetry, ESR, and UV-visible spectra studies of iron(II)-8-Quinolinol complex in liquid phase, a radical substitution mechanism is proposed and used to demonstrate the experimental facts clearly. (C) 1997 Academic Press.
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Iron(II)-8-Quinolinol/MCM-41-Catalyzed Phenol Hydroxylation and Reaction Mechanism
Journal of Catalysis, 1997Co-Authors: Chibiao Liu, Yongkui Shan, Xiangguang YangAbstract:Iron(II)-8-quinolino/MCM-41 is prepared. Its catalysis is studied in phenol hydroxylation using H2O2 (30%) as oxidant. The experiment shows that Iron(II)-8-Quinolinol/MCM-41 has good catalytic activity and desired stability. Based on cyclic voltammetry, ESR, and UV-visible spectra studies of iron(II)-8-Quinolinol complex in liquid phase, a radical substitution mechanism is proposed and used to demonstrate the experimental facts clearly. (C) 1997 Academic Press.
Mo-hsiung Yang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, properties and applications of silica-immobilized 8-Quinolinol: Part 1. Characterization of silica-immobilized 8-Quinolinol synthesized via a Mannich reaction
Analytica Chimica Acta, 1994Co-Authors: Chi-ren Lan, Mo-hsiung YangAbstract:Abstract A one-step Mannich reaction has been developed for the immobilization of 8-Quinolinol on aminopropylsilica gel that results in a product exhibiting a capacity of 466 ± 20 μmol g −1 for copper(II) ions. Capacity measurements were made by copper(II) uptake and elemental analysis. Characterization of the silica bound ligands in this synthetic context including IR spectrometry, 13 C NMR spectrometry, acid-base properties and stabilities were presented. The effect of pH on the extraction of copper(II), nickel(II) and cadmium(II) for silica-immobilized 8-Quinolinol was also evaluated.
Chibiao Liu - One of the best experts on this subject based on the ideXlab platform.
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iron ii 8 Quinolinol mcm 41 catalyzed phenol hydroxylation and reaction mechanism
Journal of Catalysis, 1997Co-Authors: Chibiao Liu, Yongkui Shan, Xiangguang YangAbstract:Iron(II)-8-quinolino/MCM-41 is prepared. Its catalysis is studied in phenol hydroxylation using H2O2 (30%) as oxidant. The experiment shows that Iron(II)-8-Quinolinol/MCM-41 has good catalytic activity and desired stability. Based on cyclic voltammetry, ESR, and UV-visible spectra studies of iron(II)-8-Quinolinol complex in liquid phase, a radical substitution mechanism is proposed and used to demonstrate the experimental facts clearly. (C) 1997 Academic Press.
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Iron(II)-8-Quinolinol/MCM-41-Catalyzed Phenol Hydroxylation and Reaction Mechanism
Journal of Catalysis, 1997Co-Authors: Chibiao Liu, Yongkui Shan, Xiangguang YangAbstract:Iron(II)-8-quinolino/MCM-41 is prepared. Its catalysis is studied in phenol hydroxylation using H2O2 (30%) as oxidant. The experiment shows that Iron(II)-8-Quinolinol/MCM-41 has good catalytic activity and desired stability. Based on cyclic voltammetry, ESR, and UV-visible spectra studies of iron(II)-8-Quinolinol complex in liquid phase, a radical substitution mechanism is proposed and used to demonstrate the experimental facts clearly. (C) 1997 Academic Press.
Massao Ionashiro - One of the best experts on this subject based on the ideXlab platform.
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thermal decomposition of the magnesium zinc lead and niobium chelates derived from 8 Quinolinol
Journal of Thermal Analysis and Calorimetry, 1997Co-Authors: S A Juiz, M I G Leles, A C F Caires, N Boralle, Massao IonashiroAbstract:Solid M-Ox compounds, whereM represents Mg(II), Zn(II), Pb(II) and NbO(III), and Ox is 8-Quinolinol, have been prepared. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR) and infrared absorption spectra (IR) have been used to characterize and to study the thermal stability and thermal decomposition of these compounds.
Kousaburo Ohashi - One of the best experts on this subject based on the ideXlab platform.
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Solid-Phase Extraction of Gallium(III) with Hydrophobic 8-Quinolinol Derivatives-impregnated Resin from Aqueous Acidic and Alkaline Solutions
Analytical Sciences, 2008Co-Authors: Nahoko Hatori, Hisanori Imura, Akira Ohashi, Kousaburo OhashiAbstract:Solid-phase extraction (SPE) of gallium(III) with hydrophobic 8-Quinolinol derivatives (HQs)-impregnated resin from aqueous acidic and alkaline solutions has been investigated. The HQs used were 7-(4-ethyl-1-methyloctyl)-8-Quinolinol (HEMOQ), 5-octyloxymethyl-8-Quinolinol (HO8Q), 2-methyl-5-octyloxymethyl-8-Quinolinol (HMO8Q), 5-dioctylaminomethyl-8-Quinolinol (HN8Q), 7-bromo-5-octyloxymethyl-8-Quinolinol (HBrO8Q), and 5-(2-ethylhexyloxymethyl)-8Quinolinol (HOEHQ). Various factors affecting the SPE, such as the substituents of the HQs, HCl and NaOH concentrations in the aqueous phase, the HQ concentration in the resin, and the equilibration time were clarified. The extractability for gallium(III) from the aqueous solution became higher in the following order: HBrO8Q < HEMOQ < HO8Q < HN8Q < HMO8Q at 3 mol l –1 HCl; HMO8Q < HO8Q < HOEHQ < HEMOQ < HN8Q < HBrO8Q at pH 0.4; HMO8Q < HO8Q | HOEHQ < HN8Q < HEMOQ at 3 mol l –1 NaOH.
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synergistic cloud point extraction behavior of aluminum iii with 2 methyl 8 Quinolinol and 3 5 dichlorophenol
Analytical Sciences, 2004Co-Authors: Akira Ohashi, Hisanori Imura, Akira Tsuguchi, Kousaburo OhashiAbstract:The cloud point extraction behavior of aluminum(III) with 8-Quinolinol (HQ) or 2-methyl-8-Quinolinol (HMQ) and Triton X-100 was investigated in the absence and presence of 3,5-dichlorophenol (Hdcp). Aluminum(III) was almost extracted with HQ and 4(v/v)% Triton X-100 above pH 5.0, but was not extracted with HMQ-Triton X-100. However, in the presence of Hdcp, it was almost quantitatively extracted with HMQ-Triton X-100. The synergistic effect of Hdcp on the extraction of aluminum(III) with HMQ and Triton X-100 may be caused by the formation of a mixed-ligand complex, Al(dcp)(MQ)2.
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Synergistic Effect of 3,5-Dichlorophenol and Trioctylphosphine Oxide on the Extraction of Vanadium(V) with 2-Methyl-8-Quinolinol Derivatives
Analytical Sciences, 2002Co-Authors: Akira Tsuguchi, Akira Ohashi, Hisanori Imura, Sungyong Choi, Kousaburo OhashiAbstract:The extraction of vanadium(V) with 2-methyl-8-Quinolinol derivatives (HA), such as 2-methyl-8-Quinolinol (HMQ), 2-methyl-5-butyloxymethyl-8-Quinolinol (HMO4Q), and 2-methyl-5-hexyloxymethyl-8-Quinolinol (HMO6Q), from a weakly acidic solution into chloroform was studied in both the absence and presence of 3,5-dichlorophenol (Hdcp) and trioctylphosphine oxide (TOPO) as the synergists. Vanadium(V) was extracted with HA as VO(OH)(A)2 in the absence of synergists, and its extractability increased with an increase in the hydrophobicity of HA. Vanadium(V) was quantitatively extracted from the lower pH region upon the addition of Hdcp and TOPO as VO(OH)(A)2·Hdcp and VO2(A)(TOPO), respectively. The enhancement of the synergistic effect of Hdcp on the extraction of vanadium(V) with HA increased in the following order: HMQ < HMO4Q < HMO6Q, as opposed to that of TOPO. This result was ascribable to the difference in the mechanisms of the occurrence of the synergistic effect by Hdcp and TOPO.
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supercritical carbon dioxide extraction equilibrium of gallium iii with 2 methyl 8 Quinolinol and 2 methyl 5 butyloxymethyl 8 Quinolinol
Talanta, 2002Co-Authors: Sungyong Choi, Zenko Yoshida, Kousaburo OhashiAbstract:Abstract This work performed fundamental studies for the extraction of gallium(III) with 2-methyl-8-Quinolinol (HMQ) and 2-methyl-5-butyloxymethyl-8-Quinolinol (HMO 4 Q) into supercritical carbon dioxide (SF-CO 2 ) from a weakly acidic solution. The distribution constants of HMO 4 Q between aqueous and SF-CO 2 phases were determined at 45 °C, 8.6–20.4 MPa and I =0.1 M (H, Na)NO 3 (M=mol dm −3 ). At 45 °C and 15.7 MPa, gallium(III) was hardly extracted with HMQ into SF-CO 2 , but was quantitatively extracted with HMO 4 Q in the pH range of 2.20–2.84. The extraction constant, K ex, SF-CO 2 (=[Ga(OH)(MO 4 Q) 2 ] SF-CO 2 [H + ] 3 [Ga 3+ ] −1 [HMO 4 Q] SF-CO 2 −2 ), of gallium(III) with HMO 4 Q was determined to be 10 −2.6±0.1 at 45 °C, 15.7 MPa and I =0.1 M (H, Na)NO 3 , which was 63 times larger than that in heptane at 45 °C and 0.10 MPa. It was also found that the addition of 3,5-dichlorophenol as a synergist enhanced the extractability of gallium(III) with HMO 4 Q into SF-CO 2 .
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Large Extractability of Aluminium(III) with 2-Methyl-8-Quinolinol Derivatives in the Presence of 3,5-Dichlorophenol
Analytical Sciences, 2000Co-Authors: Sungyong Choi, Hisanori Imura, Kousaburo OhashiAbstract:The extraction of aluminium(III) with 2-methyl-8-Quinolinol derivatives (HA), such as 2-methyl-8-Quinolinol (HMQ), 2-methyl-5-methoxymethyl-8-Quinolinol (HMO1Q), and 2-methyl-5-octyloxymethyl-8-Quinolinol (HMO8Q), from a weakly acidic solution into heptane was studied in both the absence and presence of 3,5-dichlorophenol (Hdcp) as the synergist. In the absence of Hdcp, aluminium(III) was not extracted with HMQ and HMO1Q due to a steric hindrance of the methyl group at the 2-position at all, but was slightly extracted with HMO8Q. The unusual extraction behavior of aluminium(III) with HMO8Q should be ascribed to the formation of a hydrophobic aluminium(III)-HMO8Q complex. Aluminium(III) was quantitatively extracted with HA into heptane upon the addition of Hdcp. The large synergism of Hdcp was ascribed to the formation of an inner-sphere complex, Al(dcp)(A)2, in an aqueous phase and an outer-sphere complex, Al(dcp)(A)2·Hdcp, in the organic phase. The compositions of extracted aluminium(III)-HA-Hdcp were assigned to be Al(dcp)(A)2·Hdcp. The synergistic extraction constants (Kex,s = [Al(dcp)(A)2·Hdcp]org[H+]3[Al3+]-1[HA]org-2[Hdcp]org-2) for Al(dcp)(A)2·Hdcp are 10-5.75±0.12 (HMQ), 10-4.74±0.05 (HMO1Q), and 10-3.98±0.19 (HMO8Q), respectively, at I = 0.1 M (H, Na) ClO4 (1 M = 1 mol dm-3) and 25°C.