593-51-1Relevant articles and documents
Nitrosyl Complexes of Molebdenum and Tungsten. Part 15. Iodo(monoalkylamido)nitrosylmolybdenum Complexes, some Related Tungten Compounds, and the Crystal and Molecular Structure of Ethylamido(iodo)nitrosylmolybdenum
McCleverty, Jon A.,Rae, A. Elizabeth,Wotochowicz, Iwona,Bailey, Neil A.,Smith, John M. A.
, p. 429 - 438 (1982)
The complexes (NO)I(Y)> (Y=NMe2 or NHR, where R=H, Me, Et, nPr, iPr, nBu, tBu, C6H11, C3H5, or CH2Ph) and (NO)Br(Y)> (Y=H, iPr, or CH2Ph) have been prepared by treatment of the species where Y=I(Mo) or Br(W) with ammonia primary amines, and NHMe2 respectively.Reaction of HB(3,5-Me2C3HN2)3>(NO)I(NH2)> with HCl, and with acetone in the presence of NEt3 respectively, gives (NO)Cl2> and Cl, and (NO)I(N=CMe2)>*Me2CO.The crystal and molecular structure of (NO)I(NHEt)>, as a di-isopropyl ether solvate, has been determined by X-ray diffraction methods using counter data and refined by block-diagonal least-squares procedures, to R=0.0534 for 3150 reflections.The molecule is six co-ordinate, with a linear Mo-N-O group, and a short Mo-NHEt bond.Crystals are monoclinic with a=40.00(3), b=12.751(10), c=10.60(3) angstroem.β=97.23(2) deg, space group P21/a, and Z=8.
Low-temperature photoluminescence spectroscopy of CH3NH3PbBrxCl3-x perovskite single crystals
Xu, Qiang,Shao, Wenyi,Zhang, Xinlei,Liu, Jun,Ouyang, Xiaoping,Tang, Xiaobin,Jia, Wenbao
, p. 185 - 190 (2019)
Organic-inorganic halide perovskite (OIHP) has attracted tremendous attention due to its potential applications in optoelectronics such as light emitting device and photodetector. Here, we have grown high quality CH3NH3PbBrx/su
Stereodynamics of Diethylmethylamine and Triethylamine
Bushweller, C. Hackett,Fleischman, Stephen H.,Grady, Gilbert L.,McGoff, Paul,Rithner, Christopher D.,et al.
, p. 6224 - 6236 (1982)
Diethylamine is the simplest acyclic trialkylamine that possesses the requisite symmetry that allows, in principle, the direct observation of both nitrogen inversion and isolated nitrogen-carbon bond rotation using 1H dynamic nuclear magnetic resonance (DNMR) spectroscopy.DNMR studies of diethylmethylamine and two deuterated derivatives complemented by empirical force-field calculations reveal a comprehensive picture of the stereodynamics of this representative acyclic trialkylamine.The DNMR studies show clear evidence for pyramidal inversion at nitrogen.In addition to nitrogen inversion, the results also speak for several "families" of rotamers for diethylmethylamine that undergo very rapid, DNMR-invisible intrafamily conformational exchange via isolated N-CH2 rotation while also undergoing higher barrier DNMR-visible interfamily exchange also via isolated N-CH2 rotation.The DNMR-visible N-CH2 rotation processes involve CCH3/N-alkyl eclipsing in the transition state while the DNMR-invisible processes involve CCH3/lone pair eclipsing.Although the symmetry of triethylamine precludes the DNMR-observation of nitrogen inversion, (1)H DNMR evidence for restricted N-CH2 rotation and empirical force-field calculations reveal stereodynamics for triethylamine that are highly analogous to diethylmethylamine.
Crystal Growth, Structural Phase Transitions, and Optical Gap Evolution of CH3NH3Pb(Br1-xClx)3 Perovskites
Alvarez-Galván,Alonso,López,López-Linares,Contreras,Lázaro,Fauth,Martínez-Huerta
, p. 918 - 924 (2019)
Chemically tuned inorganic-organic hybrid halide perovskites based on bromide and chloride anions CH3NH3Pb(Br1-xClx)3 have been crystallized and investigated by synchrotron X-ray diffraction (SXRD), scanning electron microscopy, and UV-vis spectroscopy. CH3NH3PbBr3 and CH3NH3PbCl3 experience successive phase transitions upon cooling, which are suppressed for intermediate compositions probably due to compositional disorder. For CH3NH3PbCl3, a transient phase, formerly described as tetragonal, was identified at 167.5 K; the analysis of SXRD data demonstrated that it is indeed orthorhombic, with space group Pnma, and a ≈ 2ap; b ≈ 2ap; c ≈ 2ap (ap is the ideal cubic perovskite unit-cell parameter). The band gap engineering brought about by the chemical management of CH3NH3Pb(Br1-xClx)3 perovskites can be controllably tuned: the gap progressively increases with the concentration of Cl ions from 2.2 to 2.9 eV, and shows a concomitant variation with the unit-cell parameters of the cubic phases at 295 K. This study provides an improved understanding of the structural and optical properties of the mixed CH3NH3Pb(Br1-xClx)3 perovskites.
Reduction of Amides to Amines with Pinacolborane Catalyzed by Heterogeneous Lanthanum Catalyst La(CH2C6H4NMe2- o)3@SBA-15
Guo, Chenjun,Zhang, Fangcao,Yu, Chong,Luo, Yunjie
supporting information, p. 13122 - 13135 (2021/08/31)
Hydroboration of amides is a useful synthetic strategy to access the corresponding amines. In this contribution, it was found that the supported lanthanum benzyl material La(CH2C6H4NMe2-o)3@SBA-15 was highly active for the hydroboration of primary, secondary, and tertiary amides to amines with pinacolborane. These reactions selectively produced target amines and showed good tolerance for functional groups such as -NO2, -halogen, and -CN, as well as heteroatoms such as S and O. This reduction procedure exhibited the recyclable and reusable property of heterogeneous catalysts and was applicable to gram-scale synthesis. The reaction mechanisms were proposed based on some control experiments and the previous literature. This is the first example of hydroborative reduction of amides to amines mediated by heterogeneous catalysts.
Solvent-free, solid phase synthesis of hybrid lead halide perovskites with superior purity
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Page/Page column 6-7, (2020/12/30)
A method of synthesizing a mixed-halide perovskite is disclosed herein. The method includes the steps of mixing a first single-halide perovskite and a second single-halide perovskite to form a solid phase mixture and heating the solid phase mixture at a temperature below a first decomposition temperature of the first single-halide perovskite and below a second decomposition temperature of the second single-halide perovskite for a time sufficient to form the mixed-halide perovskite. During the mixing, the first and second single-halide perovskite are both in the solid phase. A mixed-halide perovskite made according to the method is also disclosed herein. The mixed-halide perovskite is free of amorphous and/or semicrystalline phases. The mixed-halide perovskite can be utilized in a photovoltaic cell in a solar panel.
