Luminescent phosphorene quantum dots
(PQDs) have emerged as fascinating
nanomaterials for potential applications in optoelectronics, catalysis,
and sensing. Herein, we investigate the structural distortion of black
phosphorus (BP) under an applied electric field to yield blue luminescent
PQDs [average diameter 8 ± 1.5 nm (N = 60)].
The electrosynthesized PQDs exhibit photoluminescence emission independent
of excitation wavelength with 84% quantum efficiency. Structural distortion
that occurred during the transformation of BP to PQDs is confirmed
by results obtained during transmission electron microscopy, X-ray
diffraction and X-ray photoelectron spectroscopy. Further, using first-principles-based
density functional theory, calculations on oxygenated and nonoxygenated
PQDs augment the experimental observations that an optimum oxygen
content maintains the structural integrity of PQDs, above which the
structural robustness of PQDs is drastically diminished.
This paper describes the synthesis of multisubstituted furans through tricyclohexylphophine mediated intramolecular annulation of 1, 4‐enediones under solvent‐free greener reaction conditions. The reaction proceeds via nucleophilic attack of P(Cy)3 on the β‐carbon of 1, 4‐enediones to form oxaphosphetanes with new C–O bond formation which further eliminates O=P(Cy)3 to afford furans. The present methodology is compatible with a wide range of substrates and enabled the synthesis of a broad range of biologically significant furan derivatives in good to excellent yields (55–93%).
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.