10.1002/chem.201303729
This study investigates the synthesis, characterization, and photophysical properties of a series of tetranuclear gold(I) complexes supported by tetraphosphine ligands, specifically meso- and racemic-bis[(diphenylphosphinomethyl)phenylphosphino]methane (meso- and racemic-dpmppm). The goal of the study is to show how the arrangement of these ligands relative to the gold chain affects the structure of the tetranuclear AuI arrangement, leading to variations in the cis- and trans-arrangements. The study concludes that stereoisomeric tetraphosphines can be exploited to modify the structure of linear tetranuclear gold(I) chains, which in turn can fine-tune the strong luminescent properties inherent to the Au4 cluster center. The gold complexes with non-coordinating large anions exhibit strong luminescence in the solid state and in acetonitrile, which is effectively quenched by chloride anions via dynamic and static quenching processes. The chemicals used in the process include various gold(I) precursors, phosphine ligands, and counteranions such as Cl, PF6, BF4, and TfO.
10.1039/c3dt50492a
The research investigates the synthesis and properties of a series of eleven new [Ir(ppy)2(N^N)][PF6] complexes, where Hppy = 2-phenylpyridine and the N^N ligands are based on 2,2-bipyridine (bpy), substituted with various electron-withdrawing and electron-releasing groups. The study explores the influence of these substituents on the solution NMR spectroscopic, photophysical, and electrochemical properties of the complexes. Key chemicals involved in the research include 2-phenylpyridine (ppy), various substituted 2,2'-bipyridine (bpy) ligands, and hexafluorophosphate (PF6) as the counterion. The researchers also synthesized a representative [Ir(ppy)2(N^O)]+ complex for comparison. The complexes were characterized using techniques such as NMR spectroscopy, UV/VIS spectroscopy, emission spectroscopy, and single-crystal X-ray diffraction. The photophysical properties of the complexes were evaluated in solution, thin films, and ionic liquid media, with a focus on their potential application in light-emitting electrochemical cells (LECs). The results showed that the substituents significantly influenced the electronic properties and photophysical behavior of the complexes, with some complexes exhibiting promising performance in LEC devices.
