Affordable Access

deepdyve-link
Publisher Website

A family of enantiopure Fe(III)4 single molecule magnets: fine tuning of energy barrier by remote substituent.

Authors
  • Zhu, Yuan-Yuan
  • Cui, Chang
  • Qian, Kang
  • Yin, Ji
  • Wang, Bing-Wu
  • Wang, Zhe-Ming
  • Gao, Song
Type
Published Article
Journal
Dalton Transactions
Publisher
The Royal Society of Chemistry
Publication Date
Aug 21, 2014
Volume
43
Issue
31
Pages
11897–11907
Identifiers
DOI: 10.1039/c3dt53317d
PMID: 24967573
Source
Medline
License
Unknown

Abstract

A new family of enantiopure star-shaped Fe(III)4 single-molecule magnets (SMMs) with the general formula [Fe4(L(K))6] (H2L = (R or S)-2-((2-hydroxy-1-phenylethylimino methyl)phenol); K = H (), Cl (), Br (), I (), and t-Bu ()), were structurally and magnetically characterized. Complex was reported in our previous paper (Chem. Commun., 2011, 47, 8049-8051). Detailed magnetic measurements and a systematic magneto-structural correlation study revealed that the SMM properties of this series of compounds can be finely tuned by the remote substituent of the ligands. Although the change in the coordination environment of the central Fe(3+) ions is very small, the properties of SMM behavior are changed considerably. All five complexes display frequency dependence of the ac susceptibility. However, the χ peaks of complexes and cannot be observed down to 0.5 K. The fitted anisotropy energy barriers (Ueff) of complexes , , and were 5.9, 7.1, and 11.0 K, respectively. Moreover, the hysteresis loops of these three complexes can be also observed around 0.5 K. Magneto-structural correlation analyses revealed that the coordination symmetry of the central Fe(3+) ion and the intermolecular interaction are two key factors affecting the SMM properties. Deviation to a trigonal prism coordination environment and the existence of intermolecular interactions between neighboring clusters may both reduce the anisotropy energy barriers.

Report this publication

Statistics

Seen <100 times