7446-70-0Relevant articles and documents
Metal-Urea Complex - A Precursor to Metal Nitrides
Qiu, Yu,Gao, Lian
, p. 352 - 357 (2004)
A novel and general route to synthesize various metal nitrides (AlN, CrN, and ζ-Fe2N) from metal-urea complexes is presented. These complexes, especially metal-urea chloride, have proved to be useful precursors to metal nitrides, because urea molecules construct a coordination sphere around the metal atom and form a stable structure, compared with the air-sensitive halide. Different anions in the second coordination sphere determine the reaction mechanism. The transformation from metal-urea chloride to nitride is thought to follow a nucleation-growth mechanism, while that from metal-urea nitrate is thought to follow a nitridation mechanism. We anticipate that this metal-urea complex will find applications in the fabrication of other, more complex, nitrides.
ETHYL-SUBSTITUTED (η5-CYCLOPENTADIENYL)-BIS(DIHALOALANEDI-μ-HALO)TITANIUM(III) AND (η6-BENZENE)BIS(DIHALOALANEDI-μ-HALO)TITANIUM(II) CHLORO AND BROMO COMPLEXES
Mach, Karel,Antropiusova, Helena,Polacek, Jindrich
, p. 285 - 296 (1980)
Ethyl-substituted trinuclear complexes CpTiAl2Cl8-xEtx (x=1-4) were prepared by the reaction of CpTiCl3 with two equivalents of ethylaluminium compounds.The complexes were characterized by the half-width of their EPR single-line spectra, which decreased f
Paddock, N. L.
, p. 1070 - 1071 (1951)
Bertoti I.,Toth, A.,Szekely, T.,Pap, I. S.
, p. 325 - 332 (1981)
Use of 1,4-bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)butane as a probe for studying acid sites
Fionov,Sadykov
, p. 174 - 177 (2007)
ESR spectroscopy was applied to study paramagnetic complexes of the nitroxyl biradical of 1,4-bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)butane formed with AlCl3 in a toluene solution and resulted from the interaction with the acid sites on the SiO2 and γ-Al 2O3 surface. This biradical in solution forms a complex with two AlCl3 molecules, and a complex with two hydroxyl groups is formed on the SiO2 surface. When the biradical is adsorbed on the γ-Al2O3 surface, complex formation is complicated because of steric hindrance preventing bidentate coordination. Springer Science+Business Media, Inc. 2007.
Speciation in the AlCl3/SO2Cl2 catholyte system
Boyle, Timothy J.,Andrews, Nicholas L.,Alam, Todd M.,Tallant, David R.,Rodriguez, Mark A.,Ingersoll, David
, p. 5934 - 5940 (2005)
The fundamental chemical behavior of the AlCl3/SO 2Cl2 catholyte system was investigated using 27Al NMR spectroscopy, Raman spectroscopy, and single-crystal X-ray diffraction. Three major Al-containing species were found to be present in this catholyte system, where the ratio of each was dependent upon aging time, concentration, and/or storage temperature. The first species was identified as [Cl2Al(μ-Cl)]2 in equilibrium with AlCl3. The second species results from the decomposition of SO2Cl 2 which forms Cl2(g) and SO2(g). The SO 2(g) is readily consumed in the presence of AlCl3 to form the crystallographically characterized species [Cl2Al(μ-O 2SCl)]2 (1). For 1, each Al is tetrahedrally (T d) bound by two terminal Cl and two μ-O ligands whereas, the S is three-coordinated by two μ-O ligands and one terminal Cl. The third molecular species also has Td-coordinated Al metal centers but with increased oxygen coordination. Over time it was noted that a precipitate formed from the catholyte solutions. Raman spectroscopic studies show that this gel or precipitate has a component that was consistent with thionyl chloride. We have proposed a polymerization scheme that accounts for the precipitate formation. Further NMR studies indicate that the precipitate is in equilibrium with the solution.
Phase diagrams of some non-quasi-binary joins of the AlCl 3-BiCl3-NaCl system
Kaloev,Turieva
, p. 312 - 314 (2009)
Phase diagrams of NaAlCl4-(70.0 mol % AlCl3 + 30.0 mol % BziCl3), NaAlCl4-(34.2 mol % AlCl3 + 65.8 mol % BiCl3), and (61.0 mol % AlCl3 + 39.0 mol % NaCl)-AlCl3 ? BiCl
AlN substrates: Fabrication via vapor phase growth and characterization
Melnik,Soukhoveev,Ivantsov,Sizov,Pechnikov,Tsvetkov,Kovalenkov,Dmitriev,Nikolaev,Kuznetsov,Silveira,Freitas Jr.
, p. 22 - 25 (2003)
A new vapor phase crystal growth technique was applied to fabricate single crystal AlN wafers up to 1.75-inch diameter. The wafers were sliced from AlN crystals and polished. Fabricated AlN wafers were investigated by X-ray diffraction, TEM, and cathodoluminescence. X-ray diffraction and TEM studies confirmed single crystal structure of grown material. High electrical resistivity of these AlN wafers was verified. AlN homoepitaxial layers exhibiting sharp near-band-edge emission were grown on fabricated AlN substrates. These results open the door for the commercialization of AlN substrates for advanced high-power mm-wave devices and optoelectronic devices based on Group III-nitride semiconductors.
Synthesis in ionic liquids: [Bi2Te2Br](AlCl 4), a direct gap semiconductor with a cationic framework
Biswas, Kanishka,Zhang, Qichun,Chung, In,Song, Jung-Hwan,Androulakis, John,Freeman, Arthur J.,Kanatzidis, Mercouri G.
, p. 14760 - 14762 (2010)
The Lewis acidic ionic liquid EMIMBr-AlCl3 (EMIM = 1-ethyl-3-methylimidazolium) allows a novel synthetic route to the semiconducting layered metal chalcogenides halide [Bi2Te 2Br]-(AlCl4) and its Sb analogue. [Bi2Te 2Br](AlCl4) is a direct band gap, strongly anisotropic semiconductor and consists of cationic infinite layers of [Bi2Te 2Br]+ and [AlCl4] anions inserted between the layers.
New luminescent terbium complex for the determination of DNA
Yegorova, Alla,Karasyov, Alexander,Duerkop, Axel,Ukrainets, Igor,Antonovich, Valery
, p. 109 - 116 (2005)
New terbium complexes of derivatives of 2-oxo-4-hydroxy-quinoline-3- carboxylic acid are reported, which are highly luminescent, water soluble and do not require luminescence enhancers. The triplet-state energy levels of the ligands, the relative quantum yields (QYs) and the excitation maxima of the respective terbium chelates were determined. The large luminescence enhancement of one of these complexes by nucleic acids was investigated and a mechanism of its interaction with DNA is proposed. The optimal conditions for determination of DNA are equal concentrations of Tb3+ and ligand R1 (C = 1 × 10-6 M), pH 9.0. Under optimal conditions the luminescence intensity (RI) is proportional to the concentration of fish sperm DNA (fsDNA) or calf thymus DNA (ctDNA), respectively, within the range of 0.05-1.5 μg ml-1. The detection limits were 10ng ml-1 for fsDNA and 12 ng mr-1 for ctDNA.
Dawson, G. A.
, p. 133 (1928)
Regioselective Synthesis of 1,5-Disubstituted 1,2,3-Triazoles by Reusable AlCl3 Immobilized on γ-Al2O3
Nanjundaswamy, Hemmaragala M.,Abrahamse, Heidi
supporting information, p. 967 - 974 (2015/03/30)
(Chemical Equation Presented) There is rapidly growing interest in the synthesis and use of substituted 1,2,3-triazoles. We report an easy and interesting procedure that demonstrates the effectiveness of surface-modified γ-Al2O3, which is reusable, efficient, catalytic, safe, and environmentally acceptable for the regioselective synthesis of 1,5-disubstituted-1,2,3-triazoles via [3 + 2] cycloaddition of phenyl and benzyl azides with a series of aryl nitroolefins in good yields. No adverse effect on substituents such as nitro, cyano, hydroxy, ether linkage, and halogens was observed. The catalyst could easily be recycled and was reused for nine runs without losing its activity.
High quality Al-doped ZnO thin films deposited using targets prepared by chemical coprecipitation
Cai,Jiang,Zhu,Wang
, p. 1461 - 1464 (2010/02/15)
In order to grow high-quality aluminum-doped zinc oxide films (AZO), the chemical coprecipitation method was adopted to synthesize ultra-fine AZO powder, in which Al2O3O was more easily and more uniformly doped in ZnO compared to the