4 research outputs found
Efficient and High Yield One-Pot Synthesis of Cyclometalated Platinum(II) Ī²-Diketonates at Ambient Temperature
Cyclometalated Pt(II) Ī²-diketonates are widely used as efficient luminescent materials but are typically prepared at high temperatures in low yields using excess reagents. A one-pot synthesis of these complexes is described employing stoichiometric reagents and short reaction times at ambient temperature, giving yields of up to 94%. The method is applicable to a broad range of substrates including N<sup>ā§</sup>C, P<sup>ā§</sup>C, and C<sup>ā§</sup>C chelate Pt(II) complexes and different Ī²-diketonate ligands
Modulating the Photoisomerization of N,C-Chelate Organoboranes with Triplet Acceptors
Triplet acceptors such as naphthalene, pyrene, and anthracene have been found to be highly effective in controlling the photoisomerization efficiency of N,C-chelate boryl chromophores, establishing the involvement of a photoactive triplet state in the isomerization of this class of photochromic compounds
Highly Photoluminescent Nonconjugated Polymers for Single-Layer Light Emitting Diodes
The
design, synthesis, and characterization of solution-processable polymers
for organic light emitting diode (OLED) applications are presented.
Theoretical calculations were employed to identify a carbazole-pyrimidine
based building block as an optimized host material for the emissive
layer of an idealized OLED stack. Efficient, free radical homopolymerization
and copolymerization with a novel methacrylate-based heteroleptic
iridiumĀ(III) complex leads to a library of nonconjugated polymers
with pendant semiconductors. Optoelectronic characterization reveals
impressive photoluminescence quantum yield (PLQY) values exceeding
80% and single-layer OLEDs show optimal performance for copolymers
containing 6 mol % of iridium comonomer dopant
Chemoselective Radical Dehalogenation and CāC Bond Formation on Aryl Halide Substrates Using Organic Photoredox Catalysts
Despite
the number of methods available for dehalogenation and
carbonācarbon bond formation using aryl halides, strategies
that provide chemoselectivity for systems bearing multiple carbonāhalogen
bonds are still needed. Herein, we report the ability to tune the
reduction potential of metal-free phenothiazine-based photoredox catalysts
and demonstrate the application of these catalysts for chemoselective
carbonāhalogen bond activation to achieve CāC cross-coupling
reactions as well as reductive dehalogenations. This procedure works
both for conjugated polyhalides as well as unconjugated substrates.
We further illustrate the usefulness of this protocol by intramolecular
cyclization of a pyrrole substrate, an advanced building block for
a family of natural products known to exhibit biological activity