NDLI: Structural and magnetic tuning from a field-induced single-ion magnet to a single-chain magnet by anions

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Single-molecule magnetism in {CoIII2DyIII2}-amine-polyalcohol-acetylacetonate complexes: effects of ligand replacement at the Dy^III sites on the dynamics of magnetic relaxation

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Inorganic Chemistry Frontiers Vol - 2 Issue - 8

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Inorganic Chemistry Frontiers Vol - 2 Issue - 2

Inorganic Chemistry Frontiers Vol -1

Structural and magnetic tuning from a field-induced single-ion magnet to a single-chain magnet by anions

Content Provider	Royal Society of Chemistry (RSC)
Author	Shao, Dong Wei, Xiao-Qin Wang, Xin-Yi Zhao, Xin-Hua Wu, Dong-Qing Zhang, Shao-Liang
Copyright Year	2015
Abstract	We herein report the syntheses, crystal structures, and magnetic properties of two complexes based on the anisotropic pentagonal bipyramidal FeII starting material [Fe(LN3O2)]2+, namely [Fe(LN3O2)(H2O)2][MQ]2·H2O (1) and [Fe(LN3O2)(CN)][ABSA]·3H2O (2) (LN3O2 = 2,13-dimethyl-6,9-dioxa-3,12,18-triazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentaene; MQ− = methyl orange anion; ABSA− = 4-aminoazobenzene-4′-sulfonic anion). Compound 1 is a mononuclear material where the [Fe(LN3O2)(H2O)2]2+ cations form a one-dimensional (1D) chain by the hydrogen bonds between the bulky MQ− anions and the coordinated water molecules. With a slightly different anion, ABSA−, a cyano-bridged FeII chain is formed for compound 2. This chain has a similar structure as that in our recently reported compound [Fe(LN5)(CN)][BF4] (Chem. Commun., 2015, 51, 4360). However, compared with the reported result where the chains interact with each other through the π⋯π interactions, the chains in 2 are well isolated by the bulky ABSA− anions with the shortest interchain Fe⋯Fe distances around 12.0 Å. Magnetic investigation on 1 reveals the easy-axis magnetic anisotropy of the mononuclear FeII centre (zero-field splitting parameter D = −3.7 cm−1), which leads to the field-induced slow magnetic relaxation. For compound 2, the Fe2+ spins are antiferromagnetically coupled through the cyano bridges with a coupling constant of J = −4.13(2) cm−1 with the Hamiltonian H = −J∑Si·Si+1. AC magnetic measurements revealed the pure single-chain magnetic (SCM) behaviour of these isolated chains with an effective energy barrier of 26.1(5) K. This system represents a good example showing that the structures and magnetic properties, such as field-induced single-ion magnets, SCMs, and SCM-based magnets, can be selectively prepared by anion modification.
Starting Page	846
Ending Page	853
Page Count	8
File Format	HTM / HTML PDF
ISSN	20521553
Volume Number	2
Issue Number	9
Journal	Inorganic Chemistry Frontiers
DOI	10.1039/c5qi00089k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	ABSA Anisotropy Properties of water Methyl orange Ion Hydrogen bond Interaction Magnetic anisotropy Zero field splitting Relaxation (NMR) Antiferromagnetism J-coupling Hamiltonian mechanics
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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