546-68-9Relevant articles and documents
Ferroelectric films of Ba0.7-0.8Sr0.2-0.3TiO 3 solid solutions deposited from carboxylate solutions
Tomashpol'skii,Golikova,Rybakova
, p. 945 - 948 (2002)
Ferroelectric films of Ba0.7-0.8Sr0.2-0.3TiO 3 solid solutions 2-3 μm in thickness were deposited onto platinum substrates from carboxylate solutions and characterized by dielectric measurements at 1000 Hz: tC = 15-16°C, ε20 > 1000, tan δ = 0.04-0.06 in the range 10-100°C. The controllability coefficient of the films in a dc electric field between 36 and 42°C is 1.6.
A study on the development of CVD precursors V - Syntheses and characterization of new N-alkoxy-β-ketoiminate complexes of titanium
Lim, Sunkwon,Choi, Bohyun,Min, Yo-Sep,Kim, Daesig,Yoon, Il,Lee, Shim Sung,Lee, Ik-Mo
, p. 224 - 237 (2004)
The synthesis and characterization of various new titanium N-alkoxy-β-ketoiminate complexes are reported. Reactions between N-alkoxy-β-ketoimine ligands and Ti(O- i Pr)4 resulted in dimeric [Ti(O- i Pr)2 (N-alkoxy-β-ketoiminate)]2 complexes or monomeric [Ti(N-alkoxy-β-ketoiminate)2] ones depending on the amount of ligands. Terdentate N-alkoxy-β-ketoiminate ligands do not prevent dimer complexes from undergoing disproportional rearrangement to produce Ti(O- i Pr)4 and [Ti(N-alkoxy-β-ketoiminate)2]. The mechanism of this behavior is too complicated but it may include the dissociation and recoordination of ligands. Crystal structures of [Ti(N-alkoxy-β-ketoiminate)2] (MeC(O)CHC(Me)NC(Et)CH2O (3f) and t-BuC(O)CHC(Me)NCH2CH(Me)O (3k)) show that these are distorted octahedron and β-ketoiminate ligands appear to coordinate as a β-imino enolate. Two terdentate β-ketoiminate ligands coordinate meridionally and they are perpendicular to each other. Thermal characteristics of monomeric and dimeric titanium complexes were determined by TGA and DSC and these are reasonably volatile as potential precursors of TiO2 thin films.
Synthesis, crystal structures and spectroscopic characterization of [Ti8O8(OOCR)16] (where R = But, CH2But, C(CH3)2Et)
Piszczek,Richert,Grodzicki,G?owiak,Wojtczak
, p. 663 - 670 (2005)
Multinuclear titanium(IV) oxo carboxylates of the general formula [Ti 8O8(OOCR)16] (where R = But (1), CH2But (2), C(CH3)2Et (3)) have been synthesized in a reaction of titanium isopropoxide with the appropriate organic acids in a molar ratio of 1:2. The composition and structure of these compounds were identified by elemental analysis, IR, NMR and X-ray single-crystal diffraction. The crystal structure of 1 was solved in the orthorhombic space group Pbca. Titanium atoms form oligomeric [Ti8(μ2-O) 8] rings, where each Ti cation is surrounded by six oxygen atoms (two μ2-oxo and four μ-carboxylato bridges). Within the ring the Ti-Ti distances between neighboring titanium ions range from 3.333(1) to 3.366(1) A? and the mean value of the Ti-Ti-Ti angle is 134.2(1.3)°. Results of IR, NMR and MS studies proved that in the structures of 2 and 3, multinuclear [Ti8(μ2-O)8] clusters stabilized by carboxylate bridges are also formed. TGA/DTG, MS and variable temperature IR + (VT-IR) studies have been carried out in order to determine the thermal stability and thermal decomposition mechanism of the Ti(IV) carboxylates mentioned above.
Ferroelectric lead zirconate titanate films prepared by spray pyrolysis of carboxylate solutions
Tomashpol'skii,Rybakova,Lunina,Fedoseeva,Prutchenko,Men'shikh
, p. 500 - 507 (2001)
Ferroelectric PbTi0.6Zr0.4O3films 0.5-1.5 μm in thickness were produced on platinum substrates by spray pyrolysis of carboxylate solutions. The optimized compositions of the precursor solutions, containing methacrylic acid
Preparation method of titanium tetraisopropoxide
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Paragraph 0047-0088, (2020/11/26)
The invention relates to a preparation method of titanium tetraisopropoxide. The preparation method comprises the following steps: mixing a solvent, titanium tetrachloride and isopropanol to prepare amixed reaction system; and adding dialkylamine into the mixed reaction system to react, and carrying out aftertreatment on the obtained reactant to prepare the titanium tetraisopropoxide. The preparation method comprises the following steps: taking titanium tetrachloride and isopropanol as raw materials and adding dialkylamine into the mixed reaction system, wherein the dialkylamine can effectively absorb HCl generated by the reaction of the mixed reaction system, the reaction is promoted, meanwhile, impurities can be prevented from being generated, the high-purity titanium tetraisopropoxidecan be prepared through simple post-treatment, and the yield is high.
TRIDENTATE NITROGEN BASED LIGANDS FOR OLEFIN POLYMERISATION CATALYSTS
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, (2016/02/16)
Catalyst systems and methods for making and using the same are provided. A method for forming a polymer catalyst includes reacting a bromoketone compound with an aryl amine compound to form an amide compound. The amide compound is reacted with an ethylene diamine compound, to form a terminal primary amine compound. The terminal primary amine compound is reacted with a bromoaryl compound to form a ligand.
Dithiocarbamate complexes of Ti(IV) alkoxides: Synthesis, characterization, and electrochemistry
Donzelli, Alberto,Potvin, Pierre G.
, p. 4171 - 4178 (2009/09/26)
Isopropoxy- and ferf-butoxy-fr;'s(dithiocarbamato)titanium(IV) complexes of five dithiocarbamate ligands were prepared and characterized by LDI-MS, 1H NMR, 13C NMR, and elemental analysis, as well as by crystallographic determination of two examples. Both
Use of an organometallic compound to protect and/or strengthen a keratin material, and treatment process
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, (2008/06/13)
The use of a composition comprising at least one organometallic compound which may be obtained by partial or total hydrolysis, and partial or total condensation, of at least one metallic precursor, to at least one of protect and strengthen a keratin material.
Asymmetric synthesis of anti-homopropargylic alcohols from aldehydes and chiral sulfonimidoyl substituted bis(allyl)titanium complexes through generation and elimination of novel chiral alkylidenecarbene (dimethylamino)sulfoxonium ylides
Reddy, Leleti Rajender,Gais, Hans-Joachim,Woo, Chang-Wan,Raabe, Gerhard
, p. 10427 - 10434 (2007/10/03)
A new method for the asymmetric synthesis of anti-configured homopropargylic alcohols 1 is described, which features the addition of chiral sulfonimidoyl substituted bis(allyl)titanium complexes 3 to aldehydes, the methylation of sulfonimidoyl substituted homoallylic alcohols 2 at the N-atom, and the elimination of alkenyl (dimethylamino)sulfoxonium salts 7 with LiN(H)tBu. The reaction of isopropyl, cyclohexyl, and methyl substituted allylic titanium complexes 3a-c with benzaldehyde, p-bromobenzal-dehyde, p-chlorobenzaldehyde, p-methoxybenzaldehyde, (E)-3-phenylpropenal, and phenylpropynal afforded with high regio- and diastereoselectivities the anti-configured sulfonimidoyl substituted homoallylic alcohols 2a-j, respectively. Only one allylic unit of the titanium complexes 3a-c was transferred in the case of unsaturated aldehydes, and the starting allylic sulfoximines 2a-g were recovered in approximately 50% yield. The methylation of the silyl protected alkenyl sulfoximines 6a-j with Me3OBF4 gave in practically quantitative yields the (dimethylamino)sulfoxonium salts 7a-j, respectively. Salts 7a-e, 7g, 7h, and 7j delivered upon treatment with 2 equiv of LiN(H)tBu the enantio- and diastereomerically pure saturated and unsaturated alkynes 9a-e, 9g, 9h, and 9j, respectively, in high yields. Besides the alkynes the sulfinamide 8 (96% ee) was isolated. Aminosulfoxonium salts 9f and 9i, which carry a CC triple bond, also suffered an elimination under these conditions but did not yield the corresponding diynes. Elimination of salts 7a-e, 7g, 7h, and 7j proceeds most likely through deprotonation at the α-position with formation of the novel alkylidenecarbene aminosulfoxonium ylides 19a-e, 19g, 19h, and 19j, respectively. The ylides 19a-e, 19g, 19h, and 19j presumably eliminate sulfinamide 8 with generation of the chiral nonracemic β-siloxyalkylidene)carbenes 20a-e, 20g, 20h, and 20j, which suffer a 1,2-H-shift with formation of alkynes 9. Support for the formation of the putative alkylidenecarbenes 20 as intermediates comes from the elimination of the β-methyl substituted aminosulfoxonium salt 24, which delivered the enantio- and diastereomerically pure 2,3-dihydrofuran derivative 28 upon treatment with LiN(H)tBu in high yield. Here, the putative β-siloxyalkylidene)carbene 26 suffers a 1,5-O,Si bond insertion rather than a 1,2-Me shift. Methylation of the alkenyl sulfoximine 6a at the α-position with formation of 13 was achieved through deprotonation of the former with formation of the α-lithioalkenyl sulfoximine 11a and its treatment Mel. Reaction of the α-methylated alkenyl aminosulfoxonium salt 14a with LiN/Pr2 at low temperatures gave the enantio- and diastereomerically pure anti-configured homoallenylic alcohol derivative 15, while reaction of the salt with LiN/Pr2 or LiN(H)tBu at higher temperatures afforded the enantio- and diastereomerically pure nonterminal homopropargylic alcohol derivative 17. Deprotonation of the alkenyl (dimethylamino)sulfoxonium salts 7a and 7b with nBuLi afforded the novel alkylidenecarbene aminosulfoxonium ylides 19a and 19b, respectively, which upon treatment with Mel yielded the methylated aminosulfoxonium salts 14a and 14b, respectively.
Purified alkoxide and process for purifying crude alkoxide
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, (2008/06/13)
A purified alkoxide from which volatile impurities causing polymerization and degradation of the alkoxide are removed to extremely low concentrations. The purified alkoxide can be obtained by distilling a crude alkoxide and stripping the distilled liquid alkoxide by applying ultrasonic vibration while passing an inert gas through the liquid alkoxide. A high quality thin insulating film excellent in flatness with few defects such as voids can be obtained by using the purified alkoxide of the present invention as a CVD material.
