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Magneto-Structural Correlations in Exchange Coupled Systems

1985 Science
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Release : 1985
Genre : Science
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Book Synopsis Magneto-Structural Correlations in Exchange Coupled Systems by : R.D. Willett

Download or read book Magneto-Structural Correlations in Exchange Coupled Systems written by R.D. Willett. This book was released on 1985. Available in PDF, EPUB and Kindle. Book excerpt: The area of magnetic interactions in solids has been of technical importance and academic interest for several decades. The concept of superexchange was introduced in solid state physics in order to correlate observed magnetic behavior with electronic and crystal structure in simple inorganic systems like ferrites. These ideas were usually cast in terms of valence bond arguments and applied to high synmetry situations. In the past decade, inorganic chemists have been active in the characterization of the magnetic behavior of a wide range of transition metal polymers and clusters. In a few instances, it has been possible to deduce simple magnetic-structural correla tions for structural changes involving variation of a structural parameter over a rather limited range. Simul taneously, superexchange arguments have been recast in the language of chemistry and have provided the basis for the interpretation of these correlations on a molecular level. However, as of yet, the range of successful application of these principles has been quite limited. Thus, there was a timely need to bring together the people active in this area to discuss approaches and ideas that can help bring this area of research to maturity.

Research Frontiers In Magneto Chemistry

1993-04-28 Technology & Engineering
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Release : 1993-04-28
Genre : Technology & Engineering
Kind : eBook
Book Rating : 67X/5 ( reviews)

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Book Synopsis Research Frontiers In Magneto Chemistry by : C J O'connor

Download or read book Research Frontiers In Magneto Chemistry written by C J O'connor. This book was released on 1993-04-28. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 25 years, there have been many advances in the understanding of magnetic phenomena in molecular systems. For example, a variety of low-dimensional materials, and many new ferromagnetic, antiferromagnetic, and ferrimagnetic systems have been synthesized and analyzed; metal cluster compounds that exhibit magnetic exchange have been examined; new orbital overlap theories have been proposed to explain magneto-structural correlations in exchange coupled systems; and efforts directed toward the preparation of an organic ferromagnetic material have produced new and interesting compounds. There have also been many advances in the use of magnetism as a probe of inorganic biomolecules.This volume brings together reviews of current research in magnetochemistry that are written by the world's leading researchers in the fields of chemistry, physics, materials science, and magnetism. It contains comprehensive and in-depth reviews that describe some of the current activities of these scientists and their research and lays the foundation for future research endeavors.

The Jahn-Teller Effect

2009-12-08 Science
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Release : 2009-12-08
Genre : Science
Kind : eBook
Book Rating : 322/5 ( reviews)

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Book Synopsis The Jahn-Teller Effect by : Horst Köppel

Download or read book The Jahn-Teller Effect written by Horst Köppel. This book was released on 2009-12-08. Available in PDF, EPUB and Kindle. Book excerpt: The Jahn-Teller effect continues to be a paradigm for structural instabilities and molecular dynamical processes. This volume provides a survey of the current Jahn-Teller interactions at the interface of quantum chemistry and condensed matter physics.

EPR of Exchange Coupled Systems

2012-01-01 Science
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Release : 2012-01-01
Genre : Science
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Book Rating : 543/5 ( reviews)

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Book Synopsis EPR of Exchange Coupled Systems by : Alessandro Bencini

Download or read book EPR of Exchange Coupled Systems written by Alessandro Bencini. This book was released on 2012-01-01. Available in PDF, EPUB and Kindle. Book excerpt: The expert authors of this monograph and professional reference include Dante Gatteschi, a pioneer of molecular magnetism. Based on the spin Hamiltonian approach, this unified treatment makes extensive use of irreducible tensor techniques to analyze systems in which two or more spins are magnetically coupled. 177 figures, 38 tables, and a new Introduction by Dr. Gatteschi. 1990 edition.

Magneto-structural Correlations in a Mixed Porphyrin(Cu2+)/trityl Spin System: Magnitude, Sign and Distribution of the Exchange Coupling Constant

2023
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Release : 2023
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Book Synopsis Magneto-structural Correlations in a Mixed Porphyrin(Cu2+)/trityl Spin System: Magnitude, Sign and Distribution of the Exchange Coupling Constant by : Dinar Abdullin

Download or read book Magneto-structural Correlations in a Mixed Porphyrin(Cu2+)/trityl Spin System: Magnitude, Sign and Distribution of the Exchange Coupling Constant written by Dinar Abdullin. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Tetrathiatriarylmethyl radicals (TAM or trityl) are receiving increasing attention in various fields of magnetic resonance such as imaging, dynamic nuclear polarization, spin labeling, and, more recently, molecular magnetism and quantum information technology. Here, a trityl radical attached via a phenyl bridge to a copper(II)tetraphenylporphyrin was synthesized, and its magnetic properties studied by multi-frequency continuous-wave electron paramagnetic resonance (EPR) spectroscopy and magnetic measurements. EPR revealed that the electron spin-spin coupling constant J between the trityl and Cu2+ spin centers is ferromagnetic with a magnitude of −2.3 GHz (−0.077 cm−1, urn:x-wiley:09476539:media:chem202203148:chem202203148-math-0001 convention) and a distribution width of 1.2 GHz (0.040 cm−1). With the help of density functional theory (DFT) calculations, the obtained ferromagnetic exchange coupling, which is unusual for para-substituted phenyl-bridged biradicals, could be related to the almost perpendicular orientation of the phenyl linker with respect to the porphyrin and trityl ring planes in the energy minimum, while the J distribution was rationalized by the temperature weighted rotation of the phenyl bridge about the molecular axis connecting both spin centers. This study exemplifies the importance of molecular dynamics for the homogeneity (or heterogeneity) of the magnetic properties of trityl-based systems

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