Hybrid Molecular Compound Exhibiting Slow Magnetic Relaxation and Electrical Conductivity

Abstract

Electrochemical oxidation of a solution containing KDy(hfac) 4 (hfac, hexafluoroacetyacetone) and Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) afforded a hybrid material formulated as [β -(BEDT-TTF) 2 Dy(CF 3 COO) 4 ·MeCN] n . The complex crystallizes in the triclinic space group P1. The before mentioned complex has a chain structure containing 4f ions bridged by mono-anion CF 3 COO − ligand, and acts as single-molecule magnet (SMM) at low temperature. The conducting layer was composed of partially oxidized BEDT-TTF molecules in β type arrangement. The presence of radical cation and its charge ordering was assigned on the basis of optical spectra. Electrical resistivity measurements revealed semiconducting behaviour (conductivity at room temperature of 1.1 × 10 −3 S·cm −1 , activation energy of 158.5 meV) at ambient pressure.

Simultaneous manifestation of metallic conductivity and single-molecule magnetism in a layered molecule-based compound

“…1 Combining both electrical conductivity (s) and magnetism in one compound to afford bifunctional materials has been intensively studied by P. Day and H. Kobayashi et al 2 The discovery of the giant magnetoresistance (GMR) effect by A. Fert et al 3 and P. Grünberg et al 4 in 1988 established the area of spintronics and signicantly improved the size and storage capacity of magnetic digital data drives in the 21st century. The research in this eld has concentrated on combining molecular conductors, such as bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF), 5 7,7,8,8-tetracyanoquinodimethane (TCNQ) 6 and various single-molecule magnets (SMMs), such as [Mn 2 III (5-MeOsaltmen) 2 ] À and [Dy(CF 3 COO) 4 ] À , 5,7 where 5-MeOsaltmen is the N,N 0 -(1,1,2,2tetramethylethylene)-bis (5-methoxysalicylideneiminato) dianion. SMMs can magnetically store information at a molecular level.…”

Molecular Magnetism of Lanthanides Complexes and Networks

“…One of their assets is that they can give rise easily to multi-functional materials. Such multi-functionality is found in the collection of papers of this Special Issue with contributions that highlight the unprecedented magnetic properties of lanthanide-based molecules together with chirality [1], luminescence [2,3] or electrical conductivity properties [4]. Innovative synthetic routes such as the use of helical [1,5] or protonated ligands [6] together with cutting edge characterization techniques of 4f-SMM are presented [7].…”

Molecular Magnetism of Lanthanides Complexes and Networks

“…One of their assets is that they can give rise easily to multi-functional materials. Such multi-functionality is found in the collection of papers of this Special Issue with contributions that highlight the unprecedented magnetic properties of lanthanide-based molecules together with chirality [1], luminescence [2,3] or electrical conductivity properties [4]. Innovative synthetic routes such as the use of helical [1,5] or protonated ligands [6] together with cutting edge characterization techniques of 4f-SMM are presented [7].…”

“…Masahiro Yamashita and co-workers [4] present a very appealing hybrid material in which partially oxidized BEDT-TTF molecules crystallize together with Dy III precursors to form a compound in which both SMM behavior and electrical conductivity can be observed.…”