Cobalt(II)-Nitronyl Nitroxide Chains as Molecular Magnetic Nanowires

Caneschi, Andréa; Gatteschi, Dante; Lalioti, Nikolia; Sangregorio, Claudio; Sessoli, Roberta; Venturi, G.; Vindigni, Alessandro; Rettori, A.; Pini, M. G.; Novak, Miguel A.

doi:10.1002/1521-3773(20010504)40:9<1760::aid-anie17600>3.0.co;2-u

Cited by 1,086 publications

(218 citation statements)

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“…Within the Ising model both the correlation length and the relaxation time are predicted to diverge at low temperature according to an Arrhenius law and with the same energy barrier. However, experimentally these two energy scales turn out to be different in CoPhOMe 20 , thus calling for a deeper microscopic understanding of electronic and thermodynamic properties of this compound. In the present study, this issue is addressed showing that the mismatching between the two energy scales mentioned above can be justified relaxing the hypothesis of large (virtually infinite) uniaxial magnetic anisotropy, underlying the description in terms of the Ising model.…”

Section: Introductionsupporting

confidence: 89%

“…SCM behavior has been first observed in the compound Co(hfac) 2 (NITPhOMe), hereafter called CoPhOMe, which is composed of Co(hfac) 2 moieties bridged by NITPhOMe radicals (where hfac=hexafluoroacetylacetonate and NITPhOMe=4'-methoxy-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) arranged in chiral 1D arrays 20 . Then, slow relaxation of the magnetization and hysteresis effects observed in CoPhOMe were rationalized in terms of the kinetic Ising model proposed by Glauber 21 .…”

Section: Introductionmentioning

confidence: 79%

“…Then, slow relaxation of the magnetization and hysteresis effects observed in CoPhOMe were rationalized in terms of the kinetic Ising model proposed by Glauber 21 . In the comparatively large literature on SCMs that followed, slow relaxation has essentially always been interpreted in terms of the Glauber model (or variations of it), which indeed allows to explain several remarkable features of CoPhOMe [16][17][18][19][20][22][23][24][25][26] . Within the Ising model both the correlation length and the relaxation time are predicted to diverge at low temperature according to an Arrhenius law and with the same energy barrier.…”

Section: Introductionmentioning

confidence: 97%

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Combined first-principles and thermodynamic approach toM-nitronyl nitroxide(M= Co, Mn) spin helices

et al. 2015

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The properties of two molecular-based magnetic helices, composed of 3d metal Co and Mn ions bridged by Nitronyl Nitroxide radicals, are investigated by density functional calculations. Their peculiar and distinctive magnetic behavior is here elucidated by a thorough description of their magnetic, electronic, and anisotropy properties. Metal ions are antiferromagnetically coupled with the radicals, leading to a ferrimagnetically ordered ground state. A strong metal-radical exchange coupling is found, about 44 meV and 48 meV for Co-and Mn-helices, respectively. The latter have also relevant next-nearest-neighbor Mn-Mn antiferromagnetic interactions (of ∼ 6 meV). Co-sites are characterized by non-collinear uniaxial anisotropies, whereas Mn-sites are rather isotropic. A key result pertains to the Co-helix: the microscopic picture resulting from density-functional calculations allows us to propose a spin Hamiltonian of increased complexity with respect to the commonly employed Ising Hamiltonian, suitable for the study of finite-temperature behavior, and that seems to clarify the puzzling scenario of multiple characteristic energy scales observed in experiments.

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Section: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 97%

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Combined first-principles and thermodynamic approach toM-nitronyl nitroxide(M= Co, Mn) spin helices

et al. 2015

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“…41 Diversos compostos foram obtidos, por exemplo, cadeias, 42 trímeros 43 e agregados moleculares (clusters). 44 Outra motivação para a síntese destes sistemas surgiu com a descrição do primeiro composto mo- 45 O interesse neste comportamento é devido à existência de histerese magnética e à potencialidade de aplicação na construção de dispositivos de armazenamento de informação. 46 A presença de grupos CF 3 é um pré-requisito essencial para a formação de estruturas estendidas unidimensionais, uma vez que eles aumentam a acidez do centro metálico, favorecendo a coordenação dos radicais do tipo nitronil-nitróxido.…”

Section: Compostos De Coordenação Contendo Radicais Orgânicos Como LIunclassified

Compostos magnéticos moleculares: o desenvolvimento de novos materiais magnéticos nanoestruturados

Guedes¹,

Allão²,

Mercante³

et al. 2010

Quím. Nova

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Recebido em 7/11/09; aceito em 21/4/10; publicado na web em 9/8/10 MOLECULAR MAGNETIC COMPOUNDS -THE DEVELOPMENT OF NEW NANOSTRUTURED MAGNETIC MATERIALS. The development of new magnetic materials has attracted attention of researchers of different areas. In the last decades, a distinguished class of materials emerged in magnetism, in which the magnetic moment is delocalized over molecules. By varying the synthetic conditions it is possible to obtain a large variety of structures and properties using the same starting molecules. These materials have a great scientific appeal due to the possibility of presenting not only magnetic, but also optical or electrical transport properties. In this review we will present an overview of some molecular magnetic compounds, in particular molecular nanomagnets.Keywords: molecular magnetic compounds; deposition on surfaces; magnetic materials. INTRODUÇÃOO magnetismo molecular é uma área de pesquisa interdisciplinar relativamente nova que pode ser considerada uma evolução da magnetoquímica.1 As possibilidades de atuação neste tema são amplas e pesquisadores de diversas especialidades estão trabalhando cada vez mais em conjunto. Esta interação envolve sínteses orgânica e inorgânica e o uso de técnicas de caracaterização magnética, difração de raios-x, eletroquímica e espectroscopias diversas, entre outras técnicas. Um dos objetivos é compreender a origem das propriedades magnéticas, sendo uma área que apresenta grandes desafios também para pesquisadores que fazem cálculos, envolvendo desde a simulação de dados experimentais até cálculos mais elaborados de modelagem molecular e energia dos sistemas possibilitando fazer correlações magneto-estruturais. 2Esta interdisciplinaridade tem possibilitado a descoberta e o entendimento de novos fenômenos como o tunelamento quântico da magnetização, coerência e emaranhamento quântico, que são fundamentais para aplicações na área de computação quântica. Além disso, outro grande atrativo é que estes materiais moleculares podem apresentar sinergia entre propriedades magnéticas, condutoras e ópticas, o que é interessante para aplicações tecnológicas. 4 Neste artigo de revisão são apresentadas algumas das diversas estratégias utilizadas na síntese de compostos magnéticos moleculares. Também será abordado o progresso na obtenção e deposição em superfícies de um dos sistemas mais interessantes da área, os chamados magnetos de uma molécula ou nanomagnetos moleculares. Esta é uma etapa de extrema importância que visa a formação de sistemas magnéticos nanoestruturados para aplicação em dispositivos. COMPOSTOS MAGNÉTICOS MOLECULARES PURAMENTE ORGÂNICOSMoléculas orgânicas paramagnéticas são conhecidas por apresentarem alta reatividade, além de não serem estáveis termicamente. No entanto, certas classes de radicais orgânicos apresentam estabilidade à temperatura ambiente e relativa facilidade sintética, o que vêm fascinando químicos e físicos pela variedade de propriedades magnéticas, ópticas e condutoras que podem exibir. 5O estudo das propriedades magn...

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“…[3][4][5][6] To date, various methods have been developed for synthesizing Copper and its oxide Nanoparticles (CuO NPs), including electrochemical deposition, electrospinning, template processes, hydrothermal reduction and reverse micellar systems. [7][8][9][10][11][12] On the other hand, the microwave-assisted synthesis. 13,14 which is generally quite fast, simple and efficient in energy, has been developed and is widely used in various fields such as molecular sieve preparation, radiopharmaceuticals, the preparation of inorganic complexes and oxide, organic reactions, plasma chemistry, analytical chemistry and catalysis.…”

Section: Introductionmentioning

confidence: 99%

Eco Friendly Synthesis, Spectroscopic Investigation of Copper and Its Oxide Nanoparticles with Excellent Electrical Conductivity

Geetha¹

2017

ATROA

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A facile and rapid route for the synthesis of uniform Nano copper and its oxide (CuO NPs) by a microwave assisted method is demonstrated. The copper and its oxide nanoparticles (CuO NPs) prepared exhibit excellent conductivity, which is comparable with electrospun copper nanofibers. Among the various metal nanoparticles, Copper and its oxide nanoparticles (CuONPs) have attracted considerable attention because copper is one of the most important in modern technology and is readily available. Copper Nanoparticles have been much attractive because it is easily available, cost effective and conducting nature. Copper and its oxide Nanoparticles were synthesized using Copper (II) succinate by microwave conventional method. Copper and its oxide Nanoparticles so obtained were characterized by UV-Visible spectroscopy, Fourier Transform Infrared Spectroscopy and X-Ray diffraction analysis. X-Ray diffraction analysis proved the formation of Copper and its oxide Nanoparticles. SEM and AFM analyses showed the presence of Nanoparticles.

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Cobalt(II)-Nitronyl Nitroxide Chains as Molecular Magnetic Nanowires

Cited by 1,086 publications

References 12 publications

Combined first-principles and thermodynamic approach toM-nitronyl nitroxide(M= Co, Mn) spin helices

Combined first-principles and thermodynamic approach toM-nitronyl nitroxide(M= Co, Mn) spin helices

Compostos magnéticos moleculares: o desenvolvimento de novos materiais magnéticos nanoestruturados

Eco Friendly Synthesis, Spectroscopic Investigation of Copper and Its Oxide Nanoparticles with Excellent Electrical Conductivity

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