996-35-0Relevant articles and documents
Supramolecular assembly of borate with quaternary ammonium: Crystal structure and tunable luminescent properties
Liang, Jie,Wang, Yong-Gang,Wang, Ying-Xia,Liao, Fu-Hui,Lin, Jian-Hua
, p. 99 - 104 (2013)
A new borate [C6H16N][B5O 6(OH)4] (1) is synthesized hydrothermally by the reaction of isopropyltrimethylammonium hydroxide with boric acid. It crystallizes in the triclinic space group P-1 with the parameters a=9.1578(10) A, b=9.372(9) A, c=9.9812(10) A, α=66.508(2)°, β=74.751(2)°, γ=81.893(2)°. The [B5O6(OH)4] - anions are interlinked via hydrogen bonding forming a 3D supramolecular network containing large cavities, where reside the (CH 3)3(i-C3H7) N+ cations. This borate shows tunable luminescent properties with temperature, heating-treatment, exciting-light, and solvents. The fluorescent intensity of 1 enhances 6-fold with decreasing the temperature from 25 K to 78 K. By treatment under different temperatures, the luminescence of 1 shifted from blue to white and the sample treated at 230 °C emits bright white light to naked eyes. The hybrid borate can disperse in different solvents, and shows a red-shifted and intense emission in polar solvents.
METHOD FOR THE CONTINUOUS PRODUCTION OF AN AMINE
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Page/Page column 21, (2008/06/13)
The invention relates to a method for the continuous production of an amine by reacting a primary or secondary alcohol, aldehyde and/or ketone with hydrogen and a nitrogen compound, selected from the group including ammonia, primary and secondary amines, at a temperature in the range of from 80 to 350 °C in the presence of a zirconium dioxide-containing catalyst, the catalytically active weight of the catalyst prior to its reduction with hydrogen containing 90 to 99.8 % by weight of zirconium dioxide (ZrO2), 0.1 to 5.0 % by weight of oxygen-containing compounds of palladium and 0.1 to 5.0 % by weight of oxygen-containing compounds of platinum.
Intramolecular motions in a series of crystalline benzylammonium bromides and dibenzylamines studied by CP/MAS NMR
Riddell, Frank G.,Rogerson, Martin
, p. 493 - 504 (2007/10/03)
A series of 15 compounds including ammonium bromides containing one or two benzyl groups with H, methyl, isopropyl, tert-butyl and tert-amyl substituents and dibenzylamihe with N-isopropyl-, N-tert-butyl- and N-tert-amyl substituents have been synthesised and studied by CP/MAS NMR. The results of dynamic NMR studies on the solids suggest that there is a dramatically wide range of molecular motions occurring in this simple series of compounds: A combination of 2D CPEXSY, dynamic line shape analyses and T1ρ measurements reveals the considerable extent of intramolecular group motions including rotations of methyl, tert-butyl, tert-amyl and phenyl groups. Rates of rotation and activation parameters for these molecular motions are derived where appropriate. In the case of benzyl-tert-butylammonium bromide, where two independent molecules of the compound exist in the asymmetric unit it is shown that the independent processes of tert-butyl rotation in the two molecules have vastly different activation energies that differ by ca. 16 kJ mol-1. The extent of the motions observed suggests that commonly held prejudices about the rigidity of molecules in crystalline solids need revising.
