76759-26-7Relevant articles and documents
Direct observation of reversible electronic energy transfer involving an iridium center
Denisov, Sergey A.,Cudre, Yanouk,Verwilst, Peter,Jonusauskas, Gediminas,Marin-Suarez, Marta,Fernandez-Sanchez, Jorge Fernando,Baranoff, Etienne,McClenaghan, Nathan D.
, p. 2677 - 2682 (2014)
A cyclometalated iridium complex is reported where the core complex comprises naphthylpyridine as the main ligand and the ancillary 2,2′-bipyridine ligand is attached to a pyrene unit by a short alkyl bridge. To obtain the complex with satisfactory purity, it was necessary to modify the standard synthesis (direct reaction of the ancillary ligand with the chloro-bridged iridium dimer) to a method harnessing an intermediate tetramethylheptanolate-based complex, which was subjected to acid-promoted removal of the ancillary ligand and subsequent complexation. The photophysical behavior of the bichromophoric complex and a model complex without the pendant pyrene were studied using steady-state and time-resolved spectroscopies. Reversible electronic energy transfer (REET) is demonstrated, uniquely with an emissive cyclometalated iridium center and an adjacent organic chromophore. After excited-state equilibration is established (5 ns) as a result of REET, extremely long luminescence lifetimes of up to 225 μs result, compared to 8.3 μs for the model complex, without diminishing the emission quantum yield. As a result, remarkably high oxygen sensitivity is observed in both solution and polymeric matrices.
Metal controlled regioselectivity in the cyclometallation of 2-(1-naphthyl)-pyridine
Kondrashov, Mikhail,Raman, Sudarkodi,Wendt, Ola F.
, p. 911 - 913 (2015)
Cyclometallation of 2-(1-naphthyl)-pyridine is described. While cyclopalladation results in a five-membered metallacycle, cycloauration displays a completely orthogonal regioselectivity, resulting in the six-membered ring analogue. Bromination of the gold metallacycle results in the new C-H functionalisation product 2-(8-bromonaphth-1-yl)pyridine. This journal is
Desulfonative Suzuki–Miyaura Coupling of Sulfonyl Fluorides
Bahadori, Maryam,Brykczyńska, Daria,Chatelain, Paul,Moran, Joseph,Muller, Cyprien,Rowley, Christopher N.,Sau, Abhijit
supporting information, p. 25307 - 25312 (2021/10/25)
Sulfonyl fluorides have emerged as powerful “click” electrophiles to access sulfonylated derivatives. Yet, they are relatively inert towards C?C bond forming transformations, notably under transition-metal catalysis. Here, we describe conditions under which aryl sulfonyl fluorides act as electrophiles for the Pd-catalyzed Suzuki–Miyaura cross-coupling. This desulfonative cross-coupling occurs selectively in the absence of base and, unusually, even in the presence of strong acids. Divergent one-step syntheses of two analogues of bioactive compounds showcase the expanded reactivity of sulfonyl fluorides to encompass both S?Nu and C?C bond formation. Mechanistic experiments and DFT calculations suggest oxidative addition occurs at the C?S bond followed by desulfonation to form a Pd-F intermediate that facilitates transmetalation.
Transition metal complex, polymer, mixture, composition and organic electronic device
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Paragraph 0239-0241, (2021/07/01)
The invention discloses a transition metal complex. The complex is represented by general formula (1) shown in the specification, G in the specification is selected from cycloalkane or a cage group, and the cage group is coordinated with a metal center in a monovalent anion form to obtain a more stable complex structure. The transition metal complex provided by the invention is used in an OLED, especially as a luminescent layer doping material, not only can provide higher luminous efficiency and longer device life, but also can improve the brightness and current efficiency of the device, and meanwhile, reduces the starting voltage to prolong the service life of the device.
