Palladium
nanoparticles entrapped in porous aromatic frameworks
(PAFs) or covalent organic frameworks may promote heterogeneous catalytic
reactions. However, preparing such materials as active nanocatalysts
usually requires additional steps for palladium entrapment and reduction.
This paper reports as a new approach, a simple procedure leading to
the self-entrapment of Pd nanoparticles within the PAF structure.
Thus, the selected Sonogashira synthesis affords PAF-entrapped Pd
nanoparticles that can catalyze the C–C Suzuki–Miyaura
cross-coupling reactions. Following this new concept, PAFs were synthesized
via Sonogashira cross-coupling of the tetraiodurated derivative of
tetraphenyladamantane or spiro-9,9′-bifluorene with 1,6-diethynylpyrene,
then characterized them using powder X-ray diffraction, diffuse reflectance
infrared Fourier transform spectroscopy, X-ray photoelectron spectroscopy,
high-resolution scanning transmission electron microscopy, and textural
properties (i.e., adsorption–desorption isotherms). The PAF-entrapped
Pd nanocatalysts showed high catalytic activity in Suzuki–Miyaura
coupling reactions (demonstrated by preserving the turnover frequency
values) and stability (demonstrated by palladium leaching and recycling
experiments). This new approach presents a new class of PAFs with
unique structural, topological, and compositional complexities as
entrapped metal nanocatalysts or for other diverse applications.
Homojunction single material organic solar cells (HOSCs) based on small donor-acceptor molecules represent the ultimate stage of simplification of OSCs. While single-material OSCs based on double-cable polymers or fullerene-based dyads...
Four acceptor–donor–acceptor (A–D–A)-type molecules bearing indacenodithiophene as donating central core and various end-capping acceptor units have been designed and synthesised as n-type materials suitable for organic solar cells (OSCs). The studied optical and electrochemical properties supported by theoretical calculations revealed that the nature and the strength of the terminal groups exert a decisive influence on the polymer bulk-heterojunction OSC performance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.