A Quasi-Liner {Mn II Dy III Mn II } Cluster Featuring In Situ Schiff Base Ligand Transformation
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ORIGINAL PAPER
A Quasi-Liner {MnIIDyIIIMnII} Cluster Featuring In Situ Schiff Base Ligand Transformation Fan Xu1 • Xue-Jing Luo1 • Cui-E Wu1 • Bei-Yi Liao1 • Kai Wang1 • Fu-Pei Liang1 Received: 8 August 2020 / Accepted: 9 September 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Employing tripodal Schiff base ligand of tris[4-(2-hydroxy-3-methoxyphenyl)-3-aza-3-butenyl]amine (H3L1) and auxiliary ligand of 2-hydroxy-5-chlorobenzaldehyde, a 3d–4f cluster of DyIII MnII2 L2 2 ½NO3 5CH3 OH (1) was synthesized. Intriguingly, the H3L1 ligand has transformed into another Schiff base ligand of {N-[4-(2-hydroxy-5-chlorophenyl)-3-aza3-butenyl]-N0 ,N00 -bis[4-(2-hydroxy-3-methoxyphenyl)-3-aza-3-butenyl]}amine (H3L2) in situ during the coordination process, that one of terminal groups of H3L1 ligand was substituted. A pair of such (L2)3- ligands chelate a DyIII and two MnII ions to form a quasi-liner {MnIIDyIIIMnII} skeleton of 1, in which the adjacent MnII and DyIII ions were bridged by three Ophenol. To the best of our knowledge, this in situ substitution of the terminal group of Schiff base ligand has not been reported in previous literature. DC magnetic susceptibility measurements were conducted on 1, revealing the weak antiferromagnetic interactions between the DyIII and MnII centers. Graphic Abstract A quasi-liner a {MnIIDyIIIMnII} cluster has been constructed from tripodal Schiff base ligand of H3L1. The H3L1 ligands underwent an in situ substitution in the coordination, which has been not reported in previous literature so far as we known. Magnetic studies reveal the weak antiferromagnetic interactions between DyIII and MnII ions.
& Kai Wang [email protected] & Fu-Pei Liang [email protected] 1
Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
123
F. Xu et al.
Mn(NO3)2 Dy(NO3)3
In situ Schiff base ligand transformation
{MnIIDyIIIMnII}
Keywords 3d–4f complexes Schiff base ligand In situ substitution reaction Magnetic properties
Introduction Single molecule magnets (SMMs) have attracted great attentions due to their potential applications of ultrahigh density magnetic information storage, qubits for quantum computing, molecular spintronics, and so on [1, 2]. As the research moves along, the 4f ions bearing significant single-ion anisotropy have become the most ideal spin centers for SMMs [3, 4]. Especially in recent years, great progress has been made in the SMM performance, through the finetuning of the single ion anisotropy in mono-nuclearity 4fSMMs [5–7]. Nevertheless, there is still an obstacle of using the 4f ions, that their rapid quantum tunneling of magnetization (QTM) usually lowers the effective energy barrier and induces the loss of remnant magnetization even in high-symmetrical systems [8, 9]. The construction of 3d–4f systems is one of the promising strategies to addr
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