A {CrLn} Complex with Exchange Coupled {Cr} Units: Structural Description and Magnetic Study.

We have prepared and structurally characterized pivalate based {Cr Ln } complexes with Ln = Dy and Gd as well as the Y analogue, with the overall formula [Cr Ln (mdea)(piv)(OH)], Ln = Gd, Dy and Y. We are reporting a detailed experimental magnetic properties study, including magnetization relaxation dynamics and calorimetric data, supported with quantum chemical calculations. The synthesis of the Y derivative, allowed to precisely identify the Cr(III)-Cr(III) exchange interaction magnitude which proved moderately strong and in agreement with known magneto-structural correlations.

Thermally and Photoinduced Spin-Crossover Behavior in Iron(II)-Silver(I) Cyanido-Bridged Coordination Polymers Bearing Acetylpyridine Ligands.

We report two new cyanido-bridged Fe(II)-Ag(I) coordination polymers using different acetylpyridine isomers, {Fe(4acpy)[Ag(CN)]} and {Fe(3acpy)[Ag(CN)]} (4acpy = 4-acetylpyridine; 3acpy = 3-acetylpyridine) displaying thermally and photoinduced spin crossover (SCO). In both cases, the acetylpyridine ligand directs the coordination polymer structure and the SCO of the materials. Using 4-acetylpyridine, a two-dimensional (2D) structure is observed in made of layers stacked on each other by silver-ketone interactions leading to a complete SCO and reversible thermally and photoswitching of the magnetic and optical properties.

Iron-Reduced Graphene Oxide Core-Shell Micromotors Designed for Magnetic Guidance and Photothermal Therapy under Second Near-Infrared Light.

Core-shell micro/nanomotors have garnered significant interest in biomedicine owing to their versatile task-performing capabilities. However, their effectiveness for photothermal therapy (PTT) still faces challenges because of their poor tumor accumulation, lower light-to-heat conversion, and due to the limited penetration of near-infrared (NIR) light. In this study, we present a novel core-shell micromotor that combines magnetic and photothermal properties.

A dinuclear Co(III)/Co(II) complex based on the Hpmide ligand showing field-induced SMM behaviour.

We report the synthesis, structural characterization and SMM behaviour of a new mixed valence Co(II)/Co(III) dinuclear complex bearing the Hpmide ligand. Well defined molecule pairs are observed in the crystal structure, bound through H-bond interactions directed by aqua ligands. From DC magnetometry data, a spin-only Hamiltonian approach including an axial zero-field splitting term seems to be enough for reasonable modelling, with a sizeable parameter close to 40 cm.

Synthesis, structural characterization, and magnetic property study of {CrLn}, Ln = Gd and Dy complexes.

We have successfully prepared and structurally characterized triangle-in-triangle {CrLn} complexes with Ln = Gd and Dy employing alcohol-amine, -methyldiethanolamine (Hmdea) and pivalate ligands. These complexes and the Yttrium analogue proved to be isostructural and crystallized in a triclinic cell. DC and AC magnetic measurements were carried out and supported by quantum computations at DFT and CASSCF levels.