Metallosupramolecular Coordination Complexes: The Design of Heterometallic 3d–4f Gridlike Structures

Axial Ligand Field in D4d Coordination Symmetry: Magnetic Relaxation of Dy SMMs Perturbed by Counteranions

A series of mononuclear Dy^III complexes with the general formula [DyLz₂(salicylaldehyde)₂]·X·solvent (Lz = 6-pyridin-2-yl[1,3,5]triazine-2,4-diamine; X = OH^- (1·OH), Cl^- (2·Cl), Br^- (3·Br)) have been synthesized using mixed salicylaldehyde/pyridinyl-triazine ligands and discriminative counteranions. The Dy^III ion in these three complexes resides in a similar D_4d coordination geometry with counteranions perturbing the coordination environment and bond lengths and angles in the lattice. Magnetostructural studies reveal that the asymmetric distribution of salicylaldehyde/pyridinyl-triazine ligands and the presence of discriminative counteranions result in the coexistence of large anisotropy and quantum tunneling of magnetization. The magnetic anisotropy is dominated by the axial ligand field with short Dy-O_sali distances and large ∠O_sali-Dy-O_sali angles, while the quantum tunneling relaxation is probably dictated by the π-π stacking of the Lz ligands, which induces an axial constriction of the coordinating plane. Ab initio calculations substantiate the diversity of the magnetic behaviors in these complexes and highlight the importance of axial ligand field with short Dy-O_sali distances, large ∠O_sali-Dy-O_sali angles and less ligand stacking in these pseudo-D_4d-symmetrical single-molecule magnets.

Solvent-mediated preparation of a heterometallic [2 × 2] grid via a 1D metal–organic template with extraordinary acid/base-resistance

Here, we have demonstrated that a metal–organic chain can serve as a template to prepare a heterometallic [2 × 2] grid through a solvent-mediated strategy.

A family of ‘windmill’-like {Cu6Ln12} complexes exhibiting single-molecule magnetism behavior and large magnetic entropy changes

The first octadecanuclear {Cu₆Ln₁₂} clusters with a ‘windmill’-like topology have been prepared from a ‘ligand blend’ comprising a pyridyl dioxime chelate and azides.