Self-assembly of Ni(ii) metallacycles (a square and a triangle) supported by tetrazine radical bridges

Abstract

Two Ni(II) molecular metallacycles of [Ni4(bpz*tz•)4(N3)4] (1) and [Ni3(bpzPhtz•)3(pzPh(Cl)tz•)3]•1.3CH3OH•9.3H2O (2) (bpz*tz = 3,6-bis(3,5-dimethyl-pyrazolyl)-1,2,4,5-tetrazine; bpzPhtz = 3,6-bis(3-phenyl-pyrazolyl)-1,2,4,5-tetrazine; pzPh(Cl)tz = 3-bis(3-phenyl-pyrazolyl)-6-Cl-1,2,4,5-tetrazine) were reported. The single-crystal X-ray diffraction study reveals that 1 displays...

[M8L4]8+-Type Squares Self-Assembled by Dipalladium Corners and Bridging Aromatic Dipyrazole Ligands for Iodine Capture

“…The extensively developed metal-directed self-assembly has evolved as an elegant and efficient strategy for the controllable bottom-up construction of well-defined supramolecular architectures, − which are based on various noncovalent bonds, such as van der Waals, coordination, electrostatic, hydrogen, and halogen bonds. − More recently, functional supramolecular assemblies have played critical roles in catalysis, biological simulations, molecular recognition, host–guest encapsulation, anion sensing, and functional materials because of their structural diversity and excellent physical properties. − So far, all of these supramolecular assembled structures have been exquisitely designed since the 1990s for metal–organic/organometallic square macrocycles (“molecular squares”). ,− Recently, there has been strong interest in the design and function of molecular squares, − and they are widely used in various fields, such as catalysis, luminescence, and anticancer therapy due to the interesting physical and chemical properties of these architectures. − Among multidentate N-donor ligands, pyrazole ligands are often used in the self-assembly of polynuclear pyrazole-bridged ring structures with metal nodes via directional metal–ligand interactions. , In our previous studies, functional square-like metallamacrocycles were prepared via a directed self-assembly approach that exploited metal–ligand and metal–metal bonding interactions. − These macrocyclic metal assemblies have displayed attr...…”

Synthesis, structure, and magnetism of a novel series of trinuclear nickel(ii) clusters

“…11–14 Nickel( ii ) ion, with a non-negligible magnetic anisotropy and flexible stereochemical activities, is a good candidate to design SMMs. 15–18 Thus, to a certain degree, the research into nickel complexes will contribute to the exploration and development of novel polynuclear coordination clusters as sophisticated magnetic materials.…”