AUTHOR=Sheng Yu , Jiang Yu-Jing , Cheng Zi-Hang , Liu Ru-Chan , Ge Jing-Yuan , Gao Feng 

TITLE=Syntheses, structures, and magnetic properties of acetate-bridged lanthanide complexes based on a tripodal oxygen ligand

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.1021358

DOI=10.3389/fchem.2022.1021358

ISSN=2296-2646

ABSTRACT=<p>Four homodinuclear lanthanide complexes, Dy<sub>2</sub> (L<sub>OEt</sub>)<sub>2</sub>(OAc)<sub>4</sub> (<bold>1</bold>), Tb<sub>2</sub> (L<sub>OEt</sub>)<sub>2</sub>(OAc)<sub>4</sub> (<bold>2</bold>), Ho<sub>2</sub>(L<sub>OEt</sub>)<sub>2</sub>(OAc)<sub>4</sub> (<bold>3</bold>), and Gd<sub>2</sub> (L<sub>OEt</sub>)<sub>2</sub>(OAc)<sub>4</sub> (<bold>4</bold>), have been synthesized and characterized based on a tripodal oxygen ligand Na [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Co(P(O)(OC<sub>2</sub>H<sub>5</sub>)<sub>2</sub>)<sub>3</sub>] (NaL<sub>OEt</sub>). Structural analyses show that the acetate anions bridge two symmetry-related Ln<sup>3+</sup> ions in the μ<sub>2</sub>:η<sup>1</sup>:η<sup>1</sup> and μ<sub>2</sub>:η<sup>1</sup>:η<sup>2</sup> coordination patterns, and each lanthanide (III) ion owns a twisted square antiprism (SAPR) conformation. Static magnetic measurements reveal the weak intramolecular ferromagnetic interaction between dysprosium (III) ions in <bold>1</bold> and antiferromagnetic Ln<sup>3+</sup>···Ln<sup>3+</sup> couplings in the other three complexes. Through the analysis of the ligand-field effect and magnetic anisotropy axis orientation, the reasons for the lack of dynamic magnetic behavior in <bold>1</bold> were identified.</p>