22-Azametallacrown-8 complex with a triazole-bridged ligand: synthesis, structure and magnetic properties

Investigating the effect of lanthanide radius and diamagnetic linkers on the framework of metallacrown complexes

By changing the stoichiometric ratios, the one-pot reaction of the glycinehydroxamic acid (H2glyha) ligand with copper(ii) and lanthanide(iii) salts in the presence of diamagnetic [Na2{Fe(CN)5(NO)}] led to two series of isostructural complexes, which can be designated as heterotrimetallic dimeric clusters [{LnCu5(glyha)5}{Fe(CN)5(NO)}(H2O)4]2·xNO3·yH2O (x = 2, y = 11 for La (1), x = 2, y = 11 for Pr (2), and x = 2, y = 11 for Nd (3)) and heterotetrametallic coordination polymers [Na{LnCu5(glyha)5}{Fe(CN)5(NO)}2(H2O)x·yH2O]n (x = 6, y = 4 for Sm (4), x = 6, y = 0 for Gd (5), x = 6, y = 4 for Tb (6), x = 5, y = 5 Dy (7), and x = 6, y = 4 for Ho (8)). Each molecular structure contains LnIII[15-metallacrown-5] nodes and diamagnetic [Fe(CN)5(NO)]2- linkers. The resulting products demonstrate diversified structural frameworks due to the radius effect of LnIII ions and different bridging fashions of diamagnetic [Fe(CN)5(NO)]2- linkers. An analysis of magnetic susceptibilities reveals that 7 exhibits ferromagnetic coupling between CuII and DyIII ions and field-induced SMM behavior.

3d–4f Metallacrown complexes with a new sandwich core: synthesis, structures and single molecule magnet behavior

Two heterometallic metallacrown complexes, [Er{Cu₄(butyrat)₄}₂]·Cl₃·MeOH·26H₂O (1) and [Yb{Cu₄(butyrat)₄}₂]·Cl₃·MeOH·26H₂O (2) (H₂butyrat = 3-aminobutyric hydroxamic acid), have been reported.

Crystal structure of dinuclear dichloridobis(dimethylformamide-kO)bis[μ2-3-(2-oxyphenyl)-5-(pyrazin-2-yl)-1,2,4-triazol-1ido-κ4-O,N:N′,N′′(2 − )]diiron(III) dimethylformamide (1/1), C36H42Cl2Fe2N14O6

C36H42Cl2Fe2N14O6, monoclinic, P21/c (no. 14), a = 10.44(4) Å, b = 9.13(3) Å, c = 22.46(7) Å, β = 100.88(4)°, V = 2101(12) Å3, Z = 2, R gt(F) = 0.0599, wR ref(F 2) = 0.1563, T = 296(2) K.

Structural diversities and related properties of four coordination polymers synthesized from original ligand of 3,3′,5,5′-azobenzenetetracarboxylic acid

Four CPs, derived from the original 3,3′,5,5′-azobenzenetetracarboxylic acid ligand were obtained under solvothermal conditions.