RESUMO
A series of multinuclear lanthanide-covalent organic polyhedra (LnCOPs), including pillar-typed triangular prisms 1-Ln3 and tetrahedra 2-Ln4 (Ln = LaIII, SmIII, EuIII), have been constructed for the first time, through either one-pot subcomponent self-assembly or postassembly metalation. In contrast to the known tetrahedral cages based on transition metals, the pillar-typed polyhedra were favored from the same organic components in the presence of lanthanides. Besides this, facile transmetalations between the 1-Ln3 polyhedra endow cascade chameleonic luminescence. Meanwhile, the open metal sites and pendent amine groups on 1-Ln3 enable these polyhedra to catalyze the Henry reaction efficiently.
RESUMO
A discrete heterometallic compound consisting of Cu(ii) and Pd(ii) units which mimicks Bovine Cu-ZnSOD has been synthesised in aqueous medium. Its superoxide radical ion scavenging activity is higher than the SOD activity of Scylla serrata tissues and comparable with the liver of Gallus domesticus.
Assuntos
Complexos de Coordenação/metabolismo , Cobre/metabolismo , Paládio/metabolismo , Superóxido Dismutase/metabolismo , Superóxidos/metabolismo , Animais , Galinhas , Complexos de Coordenação/química , Cobre/química , Crustáceos , Cristalografia por Raios X , Fígado/enzimologia , Modelos Moleculares , Estrutura Molecular , Paládio/química , Superóxido Dismutase/química , Superóxidos/químicaRESUMO
We report here the first example of concentration-triggered helicate-to-tetrahedron transformation in supramolecular lanthanide edifices, along with their highly efficient and selective luminescence sensing properties toward PA at the ppb level.
RESUMO
Complexation of the bridging bidentate ligand N,N'-(pyridine-2,6-diyl)dinicotinamide, L with palladium(II) resulted in a single discrete M(2)L(4) self-assembly, 1, in a quantitative manner. The entropically-controlled assembly of 1 resulted in a rare saturated, quadruple-stranded metallo-helicate, in which both the left-handed (M) and right-handed (P) helicates exist in the crystal structure.
