Single Molecule Magnet Behavior of a Dy2 Compound

  • ChemPubSoc Europe Logo
  • Author: Chemistry – An Asian Journal
  • Published Date: 13 November 2018
  • Source / Publisher: Chemistry – An Asian Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Single Molecule Magnet Behavior of a Dy<sub>2</sub> Compound

Single-molecule magnets (SMMs) are complexes that show superparamagnetic behavior at the molecular scale below a certain blocking temperature. SMMs could have applications, e.g., in ultra-high-density storage materials, spintronic devices, and magnetic refrigerators. Rare-earth SMMs are particularly interesting because of their large magnetic moment and magnetic anisotropy. The magnetodynamic behavior of SMMs is very sensitive to their structure, and minor changes, such as introducing solvent molecules, can influence their magnetic behavior.


Yahong Li and her colleagues at Soochow University, Suzhou, China, have synthesized a series of seven heptacoordinated dinuclear lanthanide complexes of the types Dy2L2 (1) (H3L = 2-{[bis(2-hydroxy-3-ethoxybenzyl)(aminoethyl)amino]methyl}phenol) and Ln2L2·MeCN (Ln = Dy (2), Sm (3), Eu (4), Gd (5), Tb (6), Ho (7)). The reaction of Dy(NO3)3⋅6 H2O with one equivalent of H3L at 70 °C in DMF/EtOH under autogenous pressure gave compound 1. Complexes 27 were prepared by means of the same method as that used for 1, except DMF was replaced by MeCN as the reaction solvent and Dy(NO3)3⋅6 H2O was changed to the corresponding lanthanide salts.

The slight difference between 1 and 27 arises from the existence of free MeCN molecule in 27. The purposeful introduction of solvent MeCN molecule changes the crystal system from triclinic for  Dy2L2 (1) to monoclinic for 2 and alters the Dy—O–Dy angles and Dy⋅⋅⋅Dy distances, consequentially resulting into dramatic influences on the magnetic properties of 1 and 2: Dy2L2 (1) complexes without solvent did not display SMM behavior. The complex 2 with free MeCN, Dy2L2·MeCN (pictured), in contrast, showed a field-induced slow magnetization relaxation behavior, indicating its SMM nature. The free solvent molecule tunes the single molecule magnetic behavior.

The experimental results were supported by complete active space self-consistent field (CASSCF) quantum chemical calculations. This work offers a strategy for inducing the SMM behavior in Dy2 compounds using solvents.


 

Article Views: 575

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH