Evolution from linear tetranuclear clusters into one-dimensional chains of Dy(iii) single-molecule magnets with an enhanced energy barrier. Issue 7 (24th May 2017)

• Record Type: Journal Article
• Authors: Li, Rui-Ping; Liu, Qing-Yan; Wang, Yu-Ling; Liu, Cai-Ming; Liu, Sui-Jun
• Is Part Of: Inorganic chemistry frontiers. Volume 4:Issue 7(2017)
• Page Start: 1149
• Page End: 1156
• Publication Date: 2017-05-24
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7qi00178a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Structural evolution from Dy4 clusters into 1D Dy(iii )-chains, the anisotropy energy barrier is enhanced from 45.4(2) to 144.2(1) K. Abstract : Reactions of DyCl3 ·6H2 O or Dy2 O3 with 2-quinolinecarboxylic acid (H-QLC) yielded two compounds, namely, [Dy4 (QLC)12 (H2 O)6 ] · 4H2 O (1 ) and [Dy(QLC)3 (H2 O)2 ] n (2 ). Compound1 is a linear tetranuclear structure with one central [Dy2 (QLC)4 (H2 O)4 ] subunit and two terminal [Dy(QLC)3 (H2 O)] subunits linked by bridging QLC − ligands. Compound2 has a one-dimensional (1D) chain wherein the [Dy(QLC)2 ] unit formed by two QLC − ligands chelating a Dy(iii ) ion is connected by the bridging QLC − ligands. Compounds1 and2 exhibit slow magnetic relaxation behaviour in the absence of a static magnetic field, which is rarely observed in lanthanide-carboxylate compounds. During the structural evolution from a linear Dy4 cluster of1 into a 1D chain of2, the anisotropy energy barrier ( U eff ) is enhanced from 45.4(2) to 144.2(1) K. Though the Dy(iii ) centers in1 and2 all are eight-coordinated with square antiprismatic coordination environments, the higher energy barrier observed for2 could be the result of a more favorable crystal field for the Dy(iii ) ions in2 .