Synthesis and Spectral Properties of Tris(Terphenylylpyridine)Iridium and Tris(Tritylphenylpyridine)Iridium Complexes as Novel Electrophosphorescent Materials
摘要:
Three novel iridium complexes (2a-c) have been synthesized as structural modifications of a promising electrophosphorescent material, Ir(ppy)(3) (1). The dichloromethane solutions of these complexes like 1 showed a broad metal-to-ligand charge transfer band at around 380nm in the absorption spectra and at around 520nm in the emission spectra. In contrast to that of Ir( ppy) 3, the film phases of 2a-c show remarkable emission owing to the prevention of aggregation quenching due to their bulky ligands. Organic electroluminescence devices using 2a-c emitted green light.
A Versatile Palladium-Catalyzed Synthesis of n-Alkyl-Substituted Oligo-p-phenyls
作者:Patrick Galda、Matthias Rehahn
DOI:10.1055/s-1996-4260
日期:1996.5
High-yield Pd-catalyzed syntheses of constitutionally homogeneous, n-alkyl-substituted oligo-p-phenyls having three to fifteen benzene rings connected to each other exclusively in the 1,4-(para-) fashion are reported. Most of the oligomers described readily dissolve in common organic solvents. Furthermore, their thermal phase-transition temperatures show that some of these rodlike oligomers can exist in different crystalline modifications and/or form liquid-crystalline mesophases.
Immobilized palladium nanoparticles on silica–starch substrate (PNP–SSS): As a stable and efficient heterogeneous catalyst for synthesis of p-teraryls using Suzuki reaction
作者:Ali Khalafi-Nezhad、Farhad Panahi
DOI:10.1016/j.jorganchem.2012.07.039
日期:2012.10
Immobilized palladium nanoparticles on silica-starch substrate (PNP-SSS) were found to be an efficient reusable catalyst for excellent synthesis of teraryls using Suzuki reaction. The catalytic reactivity of PNP-SSS was examined over a set of substrates, demonstrating that it is reactive toward a variety of functionalities. In this process, the PNP-SSS catalyst can be reused more than six times with almost consistent efficiency and can be recovered by simple filtration. (C) 2012 Elsevier B. V. All rights reserved.