10256-13-0Relevant articles and documents
White photoluminescent material based on a functional polysiloxane complex with lanthanide ions (Eu3+ and Dy3+)
Zheng, Fuyuan,Zhang, Jie,Feng, Shengyu
, p. 9957 - 9964 (2013)
This paper reports on a white light-emitting, polysiloxane-based material obtained by coordinating lanthanide ions (Eu3+ and Dy3+) into α, ω-N,N′-diphenylmalonamide terminated polydimethylsiloxane (PMP). PMP is a new functional polysiloxane designed and synthesized in this work. The luminescence emissions of the raw materials and the composite material were measured. The composite material produced a white luminescence with Commission Internationale de l'Eclairage coordinates of (0.32, 0.34). The polysiloxane backbone plays a role in the luminescence performance of both the PMP and the composite material. Interactions between the terminal groups of the PMP host and the rare earth ions, as revealed by infrared and fluorescence data, contribute to the emission via the antenna effect. The surface morphologies of PMP and the composite material are smooth platforms piled up by layer stacking, as observed with SEM. DSC data were also collected to research the thermal behaviour of these materials. The introduction of phenyl amide groups led to a quantum yield of 0.3% for the PMP-Eu3+-Dy 3+ composite material.
A Nanocrystal Catalyst Incorporating a Surface Bound Transition Metal to Induce Photocatalytic Sequential Electron Transfer Events
Martin, Jovan San,Zeng, Xianghua,Chen, Xihan,Miller, Collin,Han, Chuang,Lin, Yixiong,Yamamoto, Nobuyuki,Wang, Xiaoming,Yazdi, Sadegh,Yan, Yanfa,Beard, Matthew C.,Yan, Yong
supporting information, p. 11361 - 11369 (2021/08/16)
Heterogeneous photocatalysis is less common but can provide unique avenues for inducing novel chemical transformations and can also be utilized for energy transductions, i.e., the energy in the photons can be captured in chemical bonds. Here, we developed a novel heterogeneous photocatalytic system that employs a lead-halide perovskite nanocrystal (NC) to capture photons and direct photogenerated holes to a surface bound transition metal Cu-site, resulting in a N-N heterocyclization reaction. The reaction starts from surface coordinated diamine substrates and requires two subsequent photo-oxidation events per reaction cycle. We establish a photocatalytic pathway that incorporates sequential inner sphere electron transfer events, photons absorbed by the NC generate holes that are sequentially funneled to the Cu-surface site to perform the reaction. The photocatalyst is readily prepared via a controlled cation-exchange reaction and provides new opportunities in photodriven heterogeneous catalysis.
Palladium-catalyzed asymmetric haloiminolactonization of D-allylmalonamides
Kuriyama, Masami,Yamamoto, Kosuke,Ishimaru, Keiko,Fujimura, Noriyuki,Minato, Daishiro,Onomura, Osamu
, p. 744 - 754 (2019/04/26)
A catalyst composed of 10 mol% of Pd(OAc)2 and (R,R)-PhBox was proven to be effective in the asymmetric haloiminolactonization of D-allylmalonamides with N-halosuccinimides, giving the dihalogenated cyclic products with good diastereomeric ratio (up to 89/11) and enantiomeric excess (up to 72% ee).