- Preparation and properties of some new trifluoromethanesulfonates
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Nitrosyl trifluoromethanesulfonate, NOSO3CF3, has been prepared by the reaction of NO with (CF3SO3)2 and quantitatively by the reaction of NOCl with CF3SO3H. Titanium tetrachlori
- Noftle, Ronald E.,Cady, George H.
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- Heterogeneous Catalysis in Solution. Part 27. - Reaction between Titanium(III) and Triiodide Ions Catalysed by Platinum
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The rate of the reaction between titanium(III) chloride and triiodide ions in an acid chloride medium has been studied in the absence and presence of a rotating platinum disk.At low concentrations of triiodide the catalytic rate at platinum was found to be first order in I3(-), zero order with respect to Ti(III) and H(+), and proportional to the square root of the rotation speed of the disk.These results pointed to diffusion-controlled catalysis, as did the low activation energy of 19 kJ mol-1 as compared with 40 kJ mol-1 for the uncatalysed reaction.All these findings are consistent with an electrochemical interpretation of the catalytic mechanism, as was shown by the current-potential curves determined for the two reactants at the same reduced platinum surface.Provided that the voltammograms for Ti(III) had been carried out in the presence of the same concentration of KI as in the reaction mixtures, the rates and mixture potentials determined electrochemically agreed well with the catalytic rates and potentials measured experimentally.The fact that quite different results were obtained when no KI was present in the TiCl3 solution provides further confirmation for the modified form of the additivity principle.
- Xiao, Shaorong,Spiro, Michael
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- Impact of synthesis conditions on surface chemistry and structure of carbide-derived carbons
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Carbide-derived carbons produced by chlorination of titanium carbide at 600, 800, or 1100 °C were subjected to a post-treatment at 600 °C in Ar, H2, or NH3 atmosphere. Experimental results suggest that the chlorination temperature influences the ordering of carbon in a manner that impacts specific surface area and porosity. Higher chlorination temperatures lead to higher total pore volume and increased ordering, but lower microporosity. The effect of post-treatments on surface chemistry is pronounced only for samples chlorinated at 600 °C; post-treatments in Ar are shown to be less effective for chlorine removal than those performed in H2 or NH3. Post-treatments in Ar result in a lower total pore volume compared to the ones in H2 or NH3 for the same chlorination temperature. Samples chlorinated at higher temperatures contained less oxygen functionalities than samples chlorinated at 600 °C, and showed correspondingly less desorption of H2O, possibly due to diminished uptake of ambient water.
- Portet, Cristelle,Kazachkin, Dmitry,Osswald, Sebastian,Gogotsi, Yury,Borguet, Eric
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- The low temperature synthesis of metal oxides by novel hydrazine method
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The hydroxide, oxalate and citrate precursors of the metal oxides such as γ-Fe2O3, (MnZn)Fe2O4, Cu(K)Fe2O4, BaTiO3, La(Sr)MnO3, La(Sr)AlO3, La/Gd(Ca/Ba/Sr)C
- Rane,Uskaikar,Pednekar,Mhalsikar
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p. 627 - 638
(2008/10/09)
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- Compatibility of TiO2 with a CaO-CaCl2 melt
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Interaction of TiO2 with a CaO-CaCl2 melt was studied to determine whether electrolytic production of titanium from oxide raw materials is possible.
- Lebedev,Sal'nikov,Tarabaev,Sizikov,Rymkevich
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p. 1491 - 1497
(2008/03/15)
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- Electron deficient carbon-titanium triple bonds: Formation of triplet XC÷TiX3 methylidyne complexes
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Laser-ablated titanium atoms react with CX4 (X = F and Cl) to produce triplet state XC÷TiX3 complexes trapped in an argon matrix. Products are identified by their infrared spectra and comparison to theoretically predicted vibrations.
- Lyon, Jonathan T.,Andrews, Lester
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p. 9858 - 9863
(2008/10/09)
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- CALCIUM RECEPTOR-ACTIVE MOLECULES
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Method and composition useful for treating a patient having a disease characterized by an abnormal level of one or more components, the activity of which is regulated or affected by activity of one or more inorganic-ion receptor. Novel compounds useful in these methods and compositions are also provided. The method includes administering to the patient a therapeutically effective amount of a molecule active at one or more inorganic-ion receptors as an agent or antagonist. Preferably, the molecule is able to act as either a selective agonist or antagonist at a Ca receptor of one or more but not all cells chosen from the group consisting of parathyroid cells, bone osteoclasts, juxtaglomerular kidney cells, proximal tubule kidney cells, distal tubule kidney cell, cell of the thick ascending limb of Henle's loop and/or collecting duct, keratinocyte in the epidermis, parafollicular cell in the thyroid (C-cells), intestinal cell, trophoblast in the placenta, platelet, vascular smooth muscle cell, cardiac atrial cell, gastrin and glucagon secreting cells, kidney mesangial cell and mammary cell.
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- Fused thiophene compounds and medicinal use thereof
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A condensed thiophene compound of the formula (I) wherein each symbol is as defined in the specification, a pharmaceutically acceptable salt thereof and hydrates thereof. The compound of the formula (I) of the present invention is useful as a novel antipsychotic agent which is effective for both positive symptoms and negative symptoms of schizophrenia, which is associated with less side effects such as extrapyramidal motor disorder and the like and which is less associated with serious side effects such as agranulocytosis and the like. In addition, this compound is also useful as a therapeutic agent of Alzheimer's disease and manic-depressive illness.
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- Reactivity of SeOCl2 with titanium and zirconium tetrachlorides. the unexpected formation of a μ-oxo-bridged titanium(iv) derivative
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The reaction of TiCl4 with SeOCl2 affords the μ-oxo derivative [TiCl3(SeOCl2)2]2(μ-O) through a deoxygenation reaction of SeOCl2 to SeCl4 whereas ZrCl4 gives 1:1 or 1:2 adducts of formula ZrCl4(SeOCl2)n, n = l, 2. The Royal Society of Chemistry 2000.
- Calderazzo, Fausto,D'Attoma, Michele,Marchetti, Fabio,Pampaloni, Guido
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p. 2497 - 2498
(2007/10/03)
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- Trichloro monophenoxide complexes of titanium(iv)
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Thermalisation of TiCl4 and phenol (1:1) in toluene gave [TiCl3(OC6H5)] 1. The more soluble complex [TiCl3(OC6H4CMe3-4)] 2 is monomeric in benzene and reacts with 4, 4′-dimethyl-2, 2′-bipyridyl (dmbipy) to give mer-[TiCl3(OC6H4CMe3-4)(dmbipy)] 3 and the disproportionation product [TiCl2(OC6H4CMe3-4) 2(dmbipy)]. The complex [TiCl3(OC6H2Me3-2, 4, 6)] 4 is monomeric in benzene whereas [TiCl3(OC6H3Pr21-2, 6)] 5 partially disproportionates in solution into [TiCl2(OC6H3Pr21-2, 6)2] and reacts with dmbipy to give mer-[TiCl3(OC6H3Pr21-2, 6)(dmbipy)] 6 and [TiCl2(OC6H3Pr21-2, 6)2(dmbipy)]. Thermalisation of 2, 6-di-/4 in toluene caused debutylation but [TiCl3{OC6H2(CMe3)2-2, 6-Me-4}] 7 forms in light petroleum (bp range 40-60 °C). Complex 7 is monomeric in benzene and does not form adducts with dmbipy or other sigma donors. A crystal structure determination of 7 showed a monomer with distorted tetrahedral co-ordination, a Ti-O bond length of 1.750(2) A and Ti-Cl bonds longer than in TiCl4 but shorter than in [TiCl3(C5H5)] or [TiCl3{C5H3(CMe3)2-l, 3}]· 2, 4, 6-Tri-rcrt-butylphenol debutylates when thermalised with TiCl4 in toluene giving [TiCl3{OC6H4(CMe3)2-2, 4}] 8. The complexes [TiCl3{OC6H2(CMe3)2-2, 6-OMe-4}] 9, [TiCl3(OC6H3CMe3-2-Me-4)] 10, [TiCl3(OC6H4Ph-2)] 11 and the 1-naphthoxide complex [TiCl3(OC10H7)J 12 were also prepared. Density functional calculations performed on the models 4 and [TiCl3(OMe)] showed both lone pairs on oxygen donate electron density to titanium but O(2p)-to-C=C (π*) donation weakens the Ti-O interaction in the phenoxide complex; CI(2p)-to-Ti(3d) donation is much reduced in the methoxide complex. The system [TiCl3(OC6H4CMe3-4)]/AlMe 3 is 280 times more active than [TiCl3Cp] (Cp = cyclopentadienyl)/AlMe3 for low pressure (6 psi) ethylene polymerisation but 1/3 less active than TiCl4/AlMe3. The Royal Society of Chemistry 2000.
- Nielson, Alastair J.,Schwerdtfeger, Peter,Waters, Joyce M.
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p. 529 - 537
(2007/10/03)
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- Carbochlorination of TiO2
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The kinetics of carbochlorination of TiO2, using TiO2(s)-carbon(s) powder mixtures and a flowing Ar(g)-Cl2(g) reaction atmosphere, has been investigated as a function of two parameters: temperature (733-1223 K) and carbon content in the solid mixture. Carbochlorination of TiO2 exhibits two well-differentiated and successive reaction stages. The first reaction stage occurs immediately and the second stage proceeds at a rate up to two orders of magnitude lower. For both reaction stages, the rate increases with carbon content. The first stage occurs under external chlorine transport control for high carbon contents and under internal mixed control for low carbon contents. The second reaction stage occurs nearly under chemical control at all carbon contents.
- Andrade Gamboa, Julio,Bohe, Ana E.,Pasquevich, Daniel M.
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p. 131 - 139
(2008/10/09)
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- Effect of the reaction temperature on the chlorination of a Fe2O3-TiO2-C mixture
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The intrinsic kinetics of the chlorination of an hematite-titania-carbon mixture was studied by means of scanning electron microscopy and isothermal and non-isothermal thermogravimetry between 580 and 1123 K. It was observed that various reactions take place simultaneously and that a carbon surface deactivation occurs between 733 and 820 K. The latter was attributed to chemisorption of iron chlorides on the carbon surface.
- Gennari,Bohe,Pasquevich
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- On the bonding behaviour of transition metal ions in inorganic solids - Optical and E.P.R. spectroscopic studies on anhydrous phosphates and phosphate-silicates of Ti3+
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TiPO4 (green), Ti4P6Si2O25 (purple-red) and TiP3O9 (blue) show a remarkable variety of colours. We compare the results of optical and e.p.r. spectroscopic measurements on these compounds with d-electron energy levels for Ti3+ obtained by using the angular-overlap model. Thus, a unified set of angular-overlap model bonding parameters for the description of the spectroscopic behaviour of Ti3+ in anhydrous phosphates can be derived. The σ-interaction was assumed to depend on the nth power of the Ti-O bond distance, and it was found that optimum agreement with experiment occurred with n = -4.5. For the correct reproduction of the experimentally observed ground-state splittings it is necessary to allow for anisotropic π-bonding interactions between titanium and the oxygen ligands linking Ti-O coordination polyhedra.
- Glaum, Robert,Hitchman, Michael A.
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p. 1221 - 1228
(2007/10/03)
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- Process for producing polyhalogenated phthalocyanine
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A process for producing a polyhalogenated phthalocyanine containing not more than 0.02 part by weight of water-insoluble inorganic impurities derived from aluminum chloride per 100 parts by weight of phthalocyanine before halogenation, which comprises the following steps A, B and C; step A of halogenating phthalocyanine in titanium tetrachloride in the presence of aluminum chloride, step B of evaporating titanium tetrachloride and sublimating aluminum chloride by heating the halogenation reaction mixture, thereby recovering aluminum chloride as a mixture with titanium tetrachloride and obtaining a polyhalogenated phthalocyanine, and step C of recycling aluminum chloride isolated from the mixture with titanium tetrachloride or said mixture to the step A.
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- Complexation and Exchange Reactions of some Dimethylamino-substituted Group 4 Compounds
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Reactions of CH2(NMe2)2, (1), SiMe2(NMe2)2, (2), (cp=η-cyclopentadienyl), (3), and , (4), with covalent metal halides MCl4 (M=Ti,Zr,Si,Ge,or Sn) and MCl3 (M=Ti,V,or Cr) fall into two categories: (a) N-donor chelation leading to complex formation and (b) halide-NMe2 exchange.Compound (1) gives 1:1 complexes with MCl4 (M=Ti or Sn) and 2:1 complex with VCl3.Compound (2) provides 1:1 complexes with MCl4 (M=Ti,Zr,Hf, or Sn).The decomposition of TiCl4*SiMe2(NMe2)2 --> invariably occurs in both the solid state and solution.There is no reaction of (2) with metal(III) chlorides.With MCl4 (M=Si or Ge 'scrambling' reactions involving halide-NMe2 exchange occur and these have been monitored by 1H n.m.r. spectroscopy.Reactions of (3) and (4) with MCl4 (M=Si,Ge,Sn,Ti,Zr,or Hf) consistently feature halide-NMe2 exchange rather than adduct formation.All complexes have been characterised by analytical and spectroscopic (1H n.m.r. and i.r.) investigations.
- Wade, Steven R.,Willey, Gerald R.
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p. 1264 - 1267
(2007/10/02)
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- Some Reactions of Cyclotetrathiatriazenium Chloride (S4N3Cl) Vapour at Hot Metal (Iron, Titanium, or Silver) Surfaces. An Alternative Route from S4N3Cl and Silver to Disulphur Dinitride and hence Poly(sulphur nitride)
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Cyclotetrathiatriazenium chloride (thiotrithiazyl chloride, S4N3Cl) vaporized at ca. 130 deg C reacts with (i) iron, (ii) titanium, and (iii) silver (at ca. 300 deg C) to give respectively (i) S3N2Cl, S4N4 and (NSCL)3, (ii) sulphur, nitrogen, and TiCl4, a
- Banister, Arthur J.,Hauptman, Zdenek V.
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p. 731 - 735
(2007/10/02)
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