Solid solutions of heterospin molecular magnets

Fursova, E. Yu.; Shvedenkov, Yurii G.; Романенко, Г. В.; Ikorskiǐ, V. N.; Овчаренко, В. И.

doi:10.1016/s0277-5387(01)00598-8

Cited by 8 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fractions of the components of the solid could be smoothly changed in the mother solution by varying the initial Ni(L 26 ) 2 /Co(L 26 ) 2 ratio in the mother solution, which made it possible to control the transition temperature and the anomalies of the critical magnetic fields. 126 Note that, for molecular magnets, the formation of solid solutions can be an extremely effective tool for control over the magnetic characteristics of the solid.…”

Section: Molecular Magnets Based On 2-d Systemsmentioning

confidence: 99%

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Овчаренко¹

2010

Stable Radicals

Self Cite

View full text Add to dashboard Cite

IntroductionInteractions between the paramagnetic ions of transition metals and stable radicals are convenient and effective methods for the synthesis of multispin molecules. These metal-nitroxide systems are often called heterospin systems because they contain paramagnetic centers with both d (or f) odd electrons and centers with p electrons. Paramagnetic centers can differ in the electron spin, g factor, the character of electron spin density delocalization, and heat capacity. The presence of several paramagnetic centers in heterospin molecules has stirred growing interest in their magnetic properties because these compounds are convenient objects for studying the subtle peculiarities of exchange interactions and revealing valuable magnetostructural correlations. That is why coordination chemistry of transition metals with stable nitroxides is an actively developing direction in modern chemistry that contributes to problem solving in the field of molecular magnetism. The results of studies on the synthesis and properties of metal complexes with nitroxides have been considered from different viewpoints and at different times in many monographs and reviews. 1 -19 Importantly, this approach offers the potential for control over the structure of the designed heterospin molecule and the character of interactions between the odd electrons of paramagnetic centers, which is necessary for constructing justifiable magnetostructural correlations. This is one of the factors responsible for the continuous growth of the number of new metal-nitroxide complexes. The Cambridge Structural Database alone contains more than one thousand structurally defined metal-nitroxide systems. 20 Therefore, currently it is impossible and not necessary to collect all available literature data on the synthesis and properties of metal-nitroxide systems in one publication. In any account, a comprehensive review of this kind will already have become incomplete by the time of its publication because new heterospin compounds based on transition metal compounds with nitroxides are being added daily to the list. However, the Stable Radicals: Fundamentals and Applied Aspects of Odd-Electron CompoundsEdited by Robin G. Hicks

show abstract

Section: Molecular Magnets Based On 2-d Systemsmentioning

confidence: 99%

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Овчаренко¹

2010

Stable Radicals

Self Cite

View full text Add to dashboard Cite

show abstract

“…This includes compounds that show three-dimensional (3D) magnetic ordering but also low-dimensional materials like, e.g., single chain magnets (SCMs) or single molecule magnets (SMMs). − One important part in this field consists of the development of strategies for a modification of such compounds to tune their magnetic properties in more detail. In this context, the synthesis of solid solutions (mixed crystals) of different metal cations might be a promising tool, but compared to the overall literature this strategy is rarely used. − One reason for this finding might be the fact that sometimes homogeneous samples are difficult to prepare and that possible disorder of the cations might lead to a more complicated magnetic behavior, even if this might not be necessarily the case.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Magnetic Properties of Solid Solutions of Ferromagnetic Layered Coordination Polymers Prepared from Solution and the Solid State

Neumann

Rams

Wellm

et al. 2018

Crystal Growth & Design

View full text Add to dashboard Cite

Reaction of mixtures of Co(NCS)2 and Ni(NCS)2 with ethylisonicotinate in EtOH in a ratio of 1:2 leads to the formation of solid solutions (mixed crystals) of the layered compound [Co x Ni1–x (NCS)2(ethylisonicotinate)2] n that are always contaminated with an additional crystalline phase. Pure samples of the desired layer compound are accessible by using an excess of the metal salts, but in this case the Co content in the solid solutions, as determined by atomic absorption spectroscopy and energy dispersive X-ray spectroscopy, is always lower than that used in the synthesis. Therefore, solid solutions of Co x Ni1–x (NCS)2(ethylisonicotinate)4 were synthesized that upon heating transform into solid solutions of the desired layered compound, and in this case the Co/Ni ratio exactly corresponds to that used in the synthesis. The formation of solid solutions of all compounds is already indicated by comparison of the experimental powder X-ray diffraction pattern of the solid solutions with that of physical mixtures with the same Co/Ni ratio. Magnetic and specific heat measurements reveal that the solid solutions show ferromagnetic ordering, as it is the case for the homometallic compounds reported recently, and that the magnetic ordering temperature increases linearly with increasing Ni content. AC measurements show that some Co/Ni inhomogeneity is present, which is more pronounced in the solid solutions prepared via the solid state than in those prepared from solution.

show abstract

“…Bimolecular complexes [ML 2 (MeOH) 2 ][ML 2 (EtOH) 2 ], as well as the previously studied [ML 2 (ROH) 2 ] (M = Co, Ni; R = Me, Et, n -Pr, i-Pr, n -Bu, i-Bu) 51 and [ML X 2 (ROH) 2 ] (M = Co, Ni; R = Me) complexes, 61 and solid solutions [Co x Ni 1− x L 2 (MeOH) 2 ] and [Co x Ni 1− x L 2 (EtOH) 2 ] 62,63 exhibit magnetic ordering at low temperatures. A strong dependence of magnetic susceptibility on magnetic field at low temperatures is observed for the complexes.…”

Section: Resultsmentioning

confidence: 99%

Alternating [ML₂(MeOH)₂] and [ML₂(EtOH)₂] layers in low-temperature ferromagnets [ML₂(MeOH)₂][ML₂(EtOH)₂] (M = Co^II, Ni^II or CoII0.5NiII0.5)

Ovcharenko,

Fursova,

Letyagin

et al. 2023

CrystEngComm

Self Cite

View full text Add to dashboard Cite

show abstract

Solid solutions of heterospin molecular magnets

Cited by 8 publications

References 4 publications

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Synthesis and Magnetic Properties of Solid Solutions of Ferromagnetic Layered Coordination Polymers Prepared from Solution and the Solid State

Alternating [ML₂(MeOH)₂] and [ML₂(EtOH)₂] layers in low-temperature ferromagnets [ML₂(MeOH)₂][ML₂(EtOH)₂] (M = Co^II, Ni^II or CoII0.5NiII0.5)

Contact Info

Product

Resources

About

Solid solutions of heterospin molecular magnets

Cited by 8 publications

References 4 publications

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Metal–Nitroxide Complexes: Synthesis and Magnetostructural Correlations

Synthesis and Magnetic Properties of Solid Solutions of Ferromagnetic Layered Coordination Polymers Prepared from Solution and the Solid State

Alternating [ML2(MeOH)2] and [ML2(EtOH)2] layers in low-temperature ferromagnets [ML2(MeOH)2][ML2(EtOH)2] (M = CoII, NiII or CoII0.5NiII0.5)

Contact Info

Product

Resources

About

Alternating [ML₂(MeOH)₂] and [ML₂(EtOH)₂] layers in low-temperature ferromagnets [ML₂(MeOH)₂][ML₂(EtOH)₂] (M = Co^II, Ni^II or CoII0.5NiII0.5)