Structures, magnetism and electrocatalytic oxygen evolution for four dinuclear, 1D and 3D complexes based on transition metals were reported.

A new salicylaldehyde-based azo dye 5-azotriazolyl-3-methoxysalicylaldehyde (H2TMSA) displaying pH-dependent azo-hydrazone tautomerism and its two Ln3+ complexes displaying slow magnetic relaxation were reported.

Four isostructural dinuclear lanthanide complexes based on 4azotriazolyl-3-hydroxy-2-naphthoic acid (H 3 ATNA) and 3-hydroxy-2-naphthoic acid (H 2 NA) ligands, {[Ln 2 (HATNA) 2 (HNA) 2 (H 2 O) 4 ]•6DMF} (Ln = Dy (1), Tb (2), Sm (3), Eu (4); DMF = N,N-dimethylformamide) have been prepared and characterized by X-ray diffraction crystallography, dc/ac magnetic characterization, and fluorescent spectrometry. The crystallographic data reveal dinuclear lanthanide cores of complexes 1−4, bridged by phenoxo and μ 1,3 carboxyl groups. Each nine-coordinated Ln(III) ion is located in a slightly distorted monocapped square antiprism. The ligand of H 3 ATNA displays a unique antenna effect in complex 4. Complexes 1−3 display only two ligand-centered fluorescent emissive peaks around 450 and 600 nm, and complex 4 shows four characteristic Eu(III)centered emission bands at 593, 618, 653, and 698 nm under excitation at 348 nm. Complex 1 exhibits single-molecule magnet behavior that is rationalized through ab initio calculations.

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