77429-58-4Relevant academic research and scientific papers
A new class of luminescent Cu(i) complexes with tripodal ligands-TADF emitters for the yellow to red color range
Gneu?, Timo,Leitl, Markus J.,Finger, Lars H.,Rau, Nicholas,Yersin, Hartmut,Sundermeyer, J?rg
, p. 8506 - 8520 (2015/05/20)
A new class of emissive and neutral Cu(i) compounds with tripodal ligands is presented. The complexes were characterized chemically, computationally, and photophysically. Under ambient conditions, the powders of the compounds exhibit yellow to red emission with quantum yields ranging from about 5% to 35%. The emission represents a thermally activated delayed fluorescence (TADF) combined with a short-lived phosphorescence which represents a rare situation and is a consequence of high spin-orbit coupling (SOC). In the series of the investigated compounds the non-radiative rates increase with decreasing emission energy according to the energy gap law while the radiative rate is almost constant. Furthermore, a well-fit linear dependence between the experimental emission energies and the transition energies calculated by DFT and TD-DFT methods could be established, thus supporting the applicability of these computational methods also to Cu(i) complexes.
A detailed study of acetate-assisted C-H activation at palladium(IV) centers
Maleckis, Ansis,Kampf, Jeff W.,Sanford, Melanie S.
supporting information, p. 6618 - 6625 (2013/06/05)
This report describes a detailed investigation of acetate-assisted C-H activation at PdIV centers supported by the tris(2-pyridyl)methane (Py3CH) ligand. Mechanistic information about this transformation has been obtained through the following: (i) extensive one- and two-dimensional NMR analysis, (ii) reactivity studies of a series of substituted analogues, and (iii) isotope effect studies. These experiments all suggest that C-H activation at [(Py3CH)PdIV(biphenyl)Cl2]+ occurs via a multistep process involving chloride-to-acetate ligand exchange followed by conformational and configurational isomerization and then C-H cleavage. The data also suggest that C-H cleavage proceeds via an acetate-assisted mechanism with the carboxylate likely serving as an intramolecular base. The viability of acetate-assisted C-H activation at high valent palladium has important implications for the design and optimization of catalytic processes involving this transformation as a key step.
