A rhodium complex containing a tetrapodal triolefin ligand (tropP) and a phosphanyl ligand (PPh) has been prepared and characterised. The special structural confinements of the tetradentate ligand impose an unusually long Rh-PPh bond. Chemical oxidation of the complex with FcOTf affords [Rh(OTf)(tropP)] and plausibly phosphanyl radicals, which react instantly with a spin trap reagent forming a nitroxide-based persistent radical, undergo HAT with silanes or dimerise to the corresponding diphosphine (PPh). Chemical oxidation with a peroxide leads to complex [Rh(POPh)(tropP)] which is photolabile and loses the PhPO moiety upon irradiation with UV/Vis light in CHCl.
A high‐pressure modification of MgB2C2 was synthesized and structurally characterized. The compound crystallizes in the orthorhombic space group Pnnm, with the lattice parameters a = 7.19633(3) Å, b = 4.61791(13) Å and c = 2.77714(8) Å. The compound contains heterographene B–C nets, isoelectronic to graphite, just like the ambient pressure modification. The layers are intercalated by magnesium atoms, which are arranged in a chain‐like manner. According to Density Functional Theory (DFT) calculations, the high‐pressure form of MgB2C2 is a semiconductor with a band gap of 1.02 eV. The compound does not undergo a superconducting transition down to 2 K.
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.