Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni<sup>II</sup> Complex

Rogez, Guillaume; Rebilly, Jean‐Noël; Barra, Anne‐Laure; Sorace, Lorenzo; Blondin, Geneviève; Kirchner, Nadeschda; Duran, Marc; Slageren, Joris van; Parsons, Simon; Ricard, Louis; Marvilliers, Arnaud; Mallah, Talal

doi:10.1002/anie.200462294

Cited by 112 publications

(63 citation statements)

References 32 publications

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“…The ZFS parameters D for these complexes range from -8 cm -1 to 8 cm -1 [83]. In some cases, geometrical changes in the coordination environment induced greater magnetic anisotropy [113]. In the complex [Ni(HIM2-py) 2 NO 3 ]NO 3 (106), Ni II adopts a distorted octahedral geometry that is similar to pseudo-C 2v symmetry (Fig.…”

Section: Edited June 25mentioning

confidence: 97%

“…Many hexa-coordinated metal complexes exhibit magnetic anisotropies [4,12,22,[108][109][110][111][112][113][114][115][116][117][118][119][120][121][122] and a few recent studies have demonstrated possible SMM-type behavior by the mono-nuclear complexes. It should be recalled that the first reported SMM was a polynuclear complex that incorporated hexa-coordinated Mn II/III ions in a slightly distorted O h geometry [123][124][125][126].…”

Section: Six-coordinated Complexesmentioning

confidence: 98%

See 1 more Smart Citation

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Bar

Pichon

Sutter

2016

Coordination Chemistry Reviews

377

249

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Section: Edited June 25mentioning

confidence: 97%

Section: Six-coordinated Complexesmentioning

confidence: 98%

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Bar

Pichon

Sutter

2016

Coordination Chemistry Reviews

377

249

View full text Add to dashboard Cite

“…Others and we have already demonstrated the large effect of the distortion in the coordination sphere on the magnitude and the nature (Ising or XY) of the anisotropy in molecular complexes. [41][42][43][44][45] Recently, X-ray Absorption Spectroscopy (XAS) at the L 2,3 edge of Ni performed on CsNi II Cr III (CN) 6 nanoparticles demonstrated the presence of axially distorted Ni II ions (NiN 6-x O x species) that belong mainly to the particles' surface. [ 29 ] X-ray magnetic circular dichroism (XMCD) studies allowed assessing the orbital contribution (<L Z >), responsible for the magnetic anisotropy, which was found larger for the Ni II surface ions (<L Z > = 0.32) than for those located in the volume (<L Z > = 0.23).…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Prado

Mazérat

Rivière

et al. 2014

Adv Funct Materials

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5402www.MaterialsViews.com wileyonlinelibrary.com their post-modifi cation. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] We have reported an alternative surfactant-free synthesis that led, by adjusting the physico-chemical para meters, to the formation of stable colloidal aqueous solutions of nanocrystals with a narrow size distribution. [ 25,26 ] This stability originates from the negatively charged surface and has been exploited to set a versatile simple synthetic route for core-multishell heterostructured nanoparticles. [ 17 ] The method is based on a seed-mediated growth in solution of a shell on the as-obtained colloids either using the same PBA coordination network or another one. [ 17,[25][26][27][28][29] It was quite remarkable to observe that the size distribution of the resulting objects was of the order of 10%. Then, knowing that the cell parameter of the PBA networks is about 1 nm, which corresponds to two atomic layers ( Figure 1 ), such a size distribution corresponds to a control during the growth in solution over one monolayer. [ 17 ] The control of the monodispersity and the absence of stabilizing agents in these anionic objects allowed their organization in thin fi lms, [ 30,31 ] their use for surface nanopatterning, [ 32 ] and is essential for the analysis of their magnetic behaviour (see below).In a fi rst communication, [ 27 ] we have reported a series of cubic-like coordination nanoparticles of the ferromagnetic network CsNi II Cr III (CN) 6 ( T C (bulk) = 90 K) with sizes ranging from 6 to 30 nm and a narrow distribution (10-20%), using the seedmediated growth process. The study of the magnetic properties of these particles dispersed in a polymer (polyvinylpyrrolidone, PVP, for instance) allowed us determining experimentally the single domain limit size that was found to be around 15-16 nm. Below this size, as expected, a uniform reversal of the magnetization was observed. These results were in line with a Néel-Brown thermal activated magnetization reversal process with a relaxation governed by an anisotropy energy proportional to the volume of the particles, with no detectable surface anisotropy effect. [33][34][35] However, upon decreasing their size surface effects may become dominant and contribute greatly to the magnetic anisotropy of nanoparticles. [ 36,37 ] As evidenced in thin fi lms and nanoparticles, surface anisotropy constant is found higher by many orders of magnitude than that of the bulk. [ 1,38,39 ] Specifi cally in PBA nanoparticles, the role of surface anisotropy cannot be neglected because the coordination sphere of the divalent metal ions (Ni II ions here) present on the surface can be different from those belonging to the

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“…[1][2][3][4][5] The largest family of SMMs contain anisotropic metal centers linked by oxo-and carboxylate ligands, with Mn 12 O 12 (O 2 CMe) 16 (OH 2 ) 4 being the best characterized example. The complex exhibits superparamagnetic-like behavior owing to the large spin ground state and Ising-type anisotropy derived from the anisotropic metal centers present.…”

Section: Introductionmentioning

confidence: 99%

Structural Distortion and Magnetic Behavior in Cyanide‐Bridged Fe^III₂Ni^II₂ Complexes

Clérac

Wang

et al. 2007

Eur J Inorg Chem

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6 pagesInternational audienceThe X-ray structure, spectroscopic, and magnetic properties ofacyanide-bridgedcomplex,{[(Tp*)FeIII(CN)3]2[NiII(bipy)2]2- [OTf]2}*2H2O (2) are described [Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate; bipy = 2,2'-bipyridine; OTf = trifluromethanesulfonate]. Magnetic measurements indicate that 2 exhibits an S = 3 ground state and slow relaxation of the magnetization....

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Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni^II Complex

Abstract: International audienc

Cited by 112 publications

References 32 publications

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Structural Distortion and Magnetic Behavior in Cyanide‐Bridged Fe^III₂Ni^II₂ Complexes

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Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear NiII Complex

Abstract: International audienc

Cited by 112 publications

References 32 publications

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Magnetization Reversal in CsNiIICrIII(CN)6 Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Structural Distortion and Magnetic Behavior in Cyanide‐Bridged FeIII2NiII2 Complexes

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Very Large Ising‐Type Magnetic Anisotropy in a Mononuclear Ni^II Complex

Magnetization Reversal in CsNi^IICr^III(CN)₆ Coordination Nanoparticles: Unravelling Surface Anisotropy and Dipolar Interaction Effects

Structural Distortion and Magnetic Behavior in Cyanide‐Bridged Fe^III₂Ni^II₂ Complexes