22541-75-9Relevant academic research and scientific papers
Synthesis of a Viologen-Tetratitanate Intercalation Compound and its Photochemical Behaviour
Miyata, Hirokatsu,Sugahara, Yoshiyuki,Kuroda, Kazuyuki,Kato, Chuzo
, p. 2677 - 2682 (1988)
Methyl viologen has been intercalated into the interlayer space of layered tetratitanic acid by a method involving the displacement of guest molecules using an n-propylammonium tetratitanate intercalation compound.The viologen tetratitanate intercalation compound changed colour to blue when irradiated by a mercury lamp under vacuum conditions or a nitrogen atmosphere.The formation of radical cations was confirmed by visible and e.s.r. spectroscopy.The electron donor for the photoreduction is thought to originate from the tetratitanate layers.The colour was stable as long as the vacuum conditions were maintained, and fading did not occur rapidly even after introduction of air, requiring > 1 h for the colour to fade completely.These results indicate remarkable stability of the viologen radical cations in this intercalation compound.
q: a reagent for the McMurry reaction and a novel inorganic Grignard complex
Aleandri, Lorraine E.,Bogdanovic, Borislav,Gaidies, Andre,Jones, Deborah J.,Liao, Shijian,et al.
, p. 87 - 94 (1993)
The stepwise formation of two distinct bimetallic titanium/magnesium complexes during the reduction of TiCl3 (or TiCl4) by magnesium in tetrahydrofuran (THF) has been identified. (1) is produced in a first stage, but reacts further with excess Mg to give (2).The reaction is reversible in the presence of excess TiCl3.X-ray absorption spectroscopy has been used to identify the local environment in 2.The most striking feature is the existence of the shortest Ti-Mg interatomic distance yet observed.The Ti-Mg bond length, 2.72(1) Angstroem, is close to the sum of the Pauling single bond metallic radii (2.69 Angstroem) and the complex is termed an inorganic Grignard reagent by analogy with other complexes containing direct transition metal-magnesium bonds.Overall, a dimeric model is compatible with the EXAFS-derived structural parameters and solubility characteristics.The titanium atoms are linked through two bridging MgCl2Mg units and their coordination shells are completed by THF ligands.The structure of 2, and the existence of intermediate 1, can be used to rationalize the known catalytic activity of the TiCl3/Mg/THF system with respect to ether cleavage.
Photochemical mineralization of europium, titanium, and iron oxyhydroxide nanoparticles in the ferritin protein cage
Klem, Michael T.,Mosolf, Jesse,Young, Mark,Douglas, Trevor
, p. 2237 - 2239 (2008)
The Fe storage protein ferritin was used as a size-constrained reaction vessel for the photoreduction and reoxidation of complexed Eu, Fe, and Ti precursors for the formation of oxyhydroxide nanoparticles. The resultant materials were characterized by dynamic light scattering, gel electrophoresis, UV-vis spectroscopy, and transmission electron microscopy. The photoreduction and reoxidation process is inspired by biological sequestration mechanisms observed in some marine siderophore systems.
Reductions by titanium(ii) as catalyzed by titanium(iv)
Mukherjee, Ritam,Yang, Zhiyong,Gould, Edwin S.
, p. 772 - 774 (2007/10/03)
The cobalt(iii) complexes, [(NH3)5CoBr]2+ and [(NH3)5CoI]2+ are reduced by Ti(ii) solutions containing Ti(iv), generating nearly linear (zero-order) profiles that become curved only during
Charge transfer of Ti 4+ with Ar and N 2 at electron-volt energy
Yan, Min,Feng, Mang,Gao, Kelin,Zhu, Xiwen
, p. 298 - 302 (2008/10/08)
The charge-transfer reactions of ground state Ti4+ (3p6, 1S) with Ar and N2 were studied in a quadrupole r.f. ion trap at the mean collision energy of 4.55 eV. The rate coefficients were measured to be 1.06(0.14)×10-9 cm3/s for Ti4+ with Ar at an equilibrium temperature of 1.6×104 K and 7.45(0.38)×10-10 cm3/s for Ti4+ with N2 at an equilibrium temperature of 1.3×104 K. Both results are comparable with the Langevin rate coefficients.
Electrosynthesis of aminotelechelic poly(acrylamide): Initiated by Ti(III)-NH2OH redox system
Padmalatha, Ms,Sherigara
, p. 722 - 724 (2007/10/03)
Ammo-terminated poly(acrylamide) of high molecular weight has been electrochemically synthesised, using titanium(III)-hydroxylamine redox system in aqueous sulphuric acid phase. Polymer is characterised by spectral analysis and molecular weight determination. Influence of various parameters like, concentration of titanium(IV) sulphate, hydroxylamine sulphate, sulphuric acid monomer, temperature and cathodic current on polymer yield has been studied. Suitable mechanism for Ti(III)-NH2OH initiated electro polymerisation of acrylamide is proposed.
Study of immobilized catalysts. XXV. Mechanism of decomposition of complexes of CH3TiCl3 with polyacrylonitrile grafted to different polymer supports
Serebryanaya,Khrushch,Leonov,Pomogailo,D'yachkovskii
, p. 470 - 475 (2008/10/08)
Rupture of the Ti-C bond in complexes with ligands containing nitrile groups (CH3CN, PAN, P-gr.PAN, P = polyethylene, polypropylene, polytetrafluoroethylene, PAN = polyacrylonitrile) takes place according to two mechanisms: coordinate and homolytic. CH3TiCl3·2CH3CN complexes in solution decompose according to the homolytic pathway, and complexes with polymer ligands decompose according to the coordinate pathway (with the participation of the CN or CH bonds in the polymer). The formation of kinetically homogeneous complexes in solution with homo-PAN and complexes of two types in the case of PE-gr.PAN and PPr-gr.PAN was detected. The rate constants of decomposition of these complexes were found. Binding of Ti-CH3 primarily by C≡N bonds in the case of PPr-gr.PAN and with CH bonds in PE-gr.PAN could be obtained by selection of the polymer supports.
Electron transfer. 93. Further reactions of transition-metal-center oxidants with vitamin B12s (Cob(I)alamin)
Pillai, G. Chithambarathanu,Ghosh,Gould
, p. 1868 - 1871 (2008/10/08)
Vitamin B12, (cob(I)alamin) reduces europium(III), titanium(IV) (TiO(C2O4)22-), and uranium(VI) in aqueous solution. These oxidants undergo one-electron changes, leading in each case to the cobalt product cob(II)alamin (B12r). The reduction of Eu3+, which is inhibited by TES buffer, but not by glycine, is outer sphere. Its limiting specific rate (1 × 102 M-1 s-1), incorporated in the Marcus treatment, yields a B12s,B12r self-exchange rate of 104.8±0.5 M-1 s-1. Reductions of TiO(C2O4)22- are accelerated by H+ and by acetic acid. Kinetic patterns suggest three competing reaction paths involving varying degrees of protonation of the Ti(IV) center or its association with acetic acid. The very rapid reduction of U(VI) (k = 4 × 106 M-1 s-1) yields U(V) in several buffering media, even when B12s is taken in excess. The much slower conversion of U(V) to U(IV), although thermodynamically favored, appears to be retarded by the extensive reorganization of the coordination sphere of oxo-bound U(V) that must accompany its acceptance of an additional electron. The observed specific rate for the B12s-U(VI) reaction is in reasonable agreement, in the framework of the Marcus formalism, with reported values of the formal potential and the self-exchange rate for U(V,VI).
