10.1016/j.orgel.2021.106171
The research focuses on the development of a high-performance, non-doped, pure-blue electroluminescent device based on a bisphenanthroimidazole derivative with a twisted donor-acceptor structure. The study involves the design and synthesis of a compound named TPA-DPPI, which consists of bisphenanthroimidazole and triphenylamine units, exhibiting bipolar carrier transport properties. The experiments conducted include the synthesis of TPA-DPPI through a series of chemical reactions using reactants such as phenanthrene-9,10-dione, benzaldehyde, 4-nitroaniline, and ammonium acetate, followed by purification and characterization using techniques like 1H NMR, mass spectrometry, and elemental analysis. The compound's thermal properties were investigated using TGA and DSC, while its electrochemical properties were assessed through cyclic voltammetry. The molecular structure and electronic properties were analyzed using DFT calculations, and the optical properties were examined through UV–vis absorption and photoluminescence (PL) spectra. The performance of the non-doped OLED device was evaluated based on its electroluminescence, with key metrics including Commission International de l’Eclairage (CIE) coordinates, external quantum efficiency (EQE), and device stability. The research demonstrates that TPA-DPPI can achieve a high EQE of 5.20%, making it a promising candidate for non-doped pure-blue OLEDs.
10.1515/znb-2009-0906
The research investigates the intermolecular interactions of ligands in lead(II) complexes, focusing on the stereochemical activity of the lone electron pair and noncovalent donor-acceptor interactions that form multidimensional networks. The compounds [Pb2(phen)2(mbtfa)4] (1) and [Pb2(dmp)2(mbtfa)4] (2) were synthesized using 1,10-phenanthroline (phen), 2,9-dimethyl-1,10-phenanthroline (dmp), and 4-methoxybenzoyl trifluoroacetonate (mbtfa) as ligands, and characterized by elemental analysis and crystallography. The study found that the coordination numbers of Pb(II) were seven and eight for compounds 1 and 2, respectively, and that the complexes exhibited weak directional intermolecular interactions such as C–H···F, O···H–C, and π-π stacking. The research concluded that the stereochemical activity of the Pb(II) lone pair and the stability of the complexes were influenced by the nature of the ligands and their interactions, with compound 1 showing stronger intermolecular interactions and higher thermal stability than compound 2.
10.1021/ja00533a028
The research investigates the reaction mechanisms of oxygen transfer from the peroxy anion of N5-ethyl-4a-hydroperoxy-3-methyllumiflavin (4a-FlEtO2-) to various phenolate anions, aiming to understand the underlying processes and provide insights into biomimetic reactions of flavoenzyme dioxygenase. The study found that 4a-FlEtO2- can transfer both oxygen atoms to phenolate anions, leading to the formation of specific products and regeneration of reduced flavin. Key chemicals involved include 4a-FlEtO2-, phenolate anions such as 3,5-di-tert-butylcatechol (VIII), 10-methyl-9-phenanthrol (Ib), and 10-ethoxy-9-phenanthrol (Ia), and their respective products like 3,5-di-tert-butyl-o-quinone (IX), 10-hydroxy-10-methyl-9,10-dihydro-9-phenanthrone (IIIb), and 9,10-phenanthrenequinone (V). The research concludes that the oxygen-donating intermediate formed from 4a-FlEtO2- is likely a dioxetane or an oxygen molecule loosely associated with the flavin, and the reaction efficiency of 4a-FlEtO2- exceeds that of molecular oxygen by a significant margin, indicating a unique and efficient oxygen transfer mechanism.
Xi
