Control of magnetic anisotropy by macrocyclic ligand distortion in a family of Dy^IIIand Er^IIIsingle molecule magnets

Abstract

Spacer of the N6 macrocyclic ligand determines its planar distortion and modulates the magnetic anisotropy of [LnN6(NCS)3] complexes.

Thermal Dependence of the Luminescent Properties of Mononuclear TbIII Macrocyclic Complexes

“…Dysprosium (III) and erbium(III) complexes with L 1 , L 2 and L 3 with isothiocyanate anions were reported earlier by our group, together with a magneto-structural correlation. [2] The corresponding structures have similarities with those presented herein, as the macrocyclic and axial ligands are the same.…”

“…However, a detrimental effect of the isothiocyanato ligands is observed, which can be associated with the less covalent character of the bonds, as discussed below. The influence of the lateral spacer of the macrocyclic ligand on the optical properties of the studied complexes was also detected for magnetic properties of the dysprosium(III) and erbium(III) complexes with the same macrocyclic ligands and isothiocyanate anions 2 .…”

“…[41] The oxidation product was confirmed by FT-IR analysis; ν HC = O : 1721 cm À 1 ; ν N = C(py) : 1581 cm Twelve hexaaza macrocyclic complexes were synthesized by the template method, using procedures described in the literature. [2,16,42,43] The corresponding ligands (depicted in Scheme 1) were derived from 2,6-pyridinedicarbaldehyde and three different diamines: ethylenediamine (EDA; L 1 ), o-phenylenediamine (OPDA; L 2 ) and 1,3-diaminopropane (DAP; L 3 ).…”

“…Lanthanide compounds have attracted great attention of scientists for many years, due to their interesting properties, such as magnetic, [1][2][3] catalytic [4,5] and optical. [6,7] Based on lanthanide(III) emission that can be present in different regions of the electromagnetic spectrum, [8] these compounds have a broad variety of applications as emission devices, such as television, smartphones, LED, lasers, optical fibres, among others.…”

“…[12][13][14][15] However, less information is found for the structural characterization of hexaaza macrocyclic lanthanide(III) complexes, derived from 2,6-pyridinedicarbaldehyde and a diamine, and the corresponding correlation with their optical properties. [2,16] This paper reports a study related to terbium(III) and yttrium (III) macrocyclic complexes, with ligands derived from 2,6pyridinedicarbaldehyde and the following diamines: ethylenediamine (L 1 ), o-phenylenediamine (L 2 ), and 1,3-diaminepropane (L 3 ). Scheme 1 shows the macrocyclic ligands present in the corresponding complexes.…”