Synthese und eigenschaften von bis(dialkylamino)- perfluormethylphosphinen und -arsinen
作者:O. Adler、F. Kober
DOI:10.1016/s0022-328x(00)86385-8
日期:1974.6
The reaction of the perfluoromethyl compounds CF3PI2 and CF3AsI2 with secondary amines HNR2 yield the bis(dialkylamino)perfluoromethylphosphines and -arsines CF3P(NR2)2 and CF3As(NR2)2. The IR and NMR spectra are reported and discussed. The cleavage of the PN or AsN bond with acid molecules is described.
全氟甲基化合物CF 3 PI 2和CF 3 AsI 2与仲胺HNR 2的反应产生双(二烷基氨基)全氟甲基膦和--氨酸CF 3 P(NR 2)2和CF 3 As(NR 2)2。红外光谱和核磁共振光谱已报道和讨论。描述了用酸分子裂解PN或AsN键。
Dielectric phase transition of an A<sub>2</sub>BX<sub>4</sub>-type perovskite with a pentahedral to octahedral transformation
2 and compound 3 feature static two-dimensional (2D) and one-dimensional (1D) perovskite structures, respectively, it is striking that compound 1 shows a reversible pentahedral to octahedral transformation. It undergoes an above-room-temperature dielectric phase transition at Tc≅ 352 K, wherein the high dielectricconstant is more than twice the low dielectricconstant. Structural analysis shows that
X-ray and ultra-violet photoemission spectra have been measured to study the valence-band structures of piperidinium trihaloplumbates C 5 H 10 NH 2 PbX 3 [X = I, Br], which have natural nano-scale one-dimensional structures. The valence-band spectra of lead halides, which have the three-dimensional structures, are also reported for comparison. The partial densities of states related to the constituent
已测量 X 射线和紫外光发射光谱以研究具有天然纳米级一维结构的哌啶鎓三卤化铅 C 5 H 10 NH 2 PbX 3 [X = I, Br] 的价带结构。还报告了具有三维结构的卤化铅的价带光谱以供比较。通过 XPS 和 UPS 之间的比较,获得了与组成离子和分子相关的状态的部分密度。还进行了经验 LCAO 计算以分析实验结果。提出了 C 5 H 10 NH 2 PbX 3 [X = I, Br] 中的类量子阱电子结构。
The effect of organic cations on the electronic, optical and luminescence properties of 1D piperidinium, pyridinium, and 3-hydroxypyridinium lead trihalides
作者:N. I. Selivanov、Yu. A. Rozhkova、R. Kevorkyants、A. V. Emeline、D. W. Bahnemann
DOI:10.1039/c9dt04543k
日期:——
We present a structural and optoelectronic study of 1D piperidinium, pyridinium, and 3-hydroxypyridinium lead trihalides.