Role of hydrogen bonds in the propagation of ferromagnetic interactions in organic molecular solids. Part 1.—The p-hydroxyphenyl α-nitronyl aminoxyl radical case

Cirujeda, Joan; Hernandez-Gasio, Esteve; Rovira, Concepció; Stanger, Jean-Louis; Turek, Philippe; Veciana, Jaume

doi:10.1039/jm9950500243

Cited by 80 publications

(28 citation statements)

References 49 publications

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“…8͒. We have previously, tentatively, interpreted this phenomenon at a microscopic level, 19 arguing for a dominant intermolecular magnetic interaction along the A axis. The present discussion stresses the fact that the demagnetizing field is responsible for the observed behavior.…”

Section: ͑15͒mentioning

confidence: 73%

“…During the course of our studies of organic magnets, 2,19 we have often observed a rotation of the principal axes of the g tensor with temperature. As this effect has not been reported previously 3,4 it is relevant to check its importance within the present study of the demagnetizing field effects.…”

Section: Angular Displacementmentioning

confidence: 99%

“…The aforementioned studies 19 dealing with the 2D organic ferromagnet 2-͑4-hydroxyphenyl͒-4,4,5,5-tetramethyl-4,5-dihydro-1H-3oxoimidazol-1-oxyl ͑or 4-hydroxy-phenyl nitronyl nitroxide, shortened 4-OHPNN͒ ͑Fig. 6͒ may be reanalyzed within this frame.…”

Section: ͑15͒mentioning

confidence: 99%

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Role of the demagnetizing field on the EPR of organic radical magnets

et al. 1997

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It has been long thought that microscopic mechanisms related to magnetic short-range order were responsible for the temperature dependence of the electron paramagnetic resonance g tensor in low-dimensional magnetic systems. We show here that the demagnetizing field can explain qualitatively and quantitatively the observed features, i.e., ͑i͒ the g shift, variation of the g value, ͑ii͒ the presence of magic angles where there is no g shift, and ͑iii͒ the reorientation of the g tensor with temperature. These features are discussed theoretically and supported experimentally in purely organic insulating compounds. Previous results obtained on two different nitroxide derivatives are revisited in this framework. The role of the demagnetizing field may probably be generalized to most low-dimensional molecular materials.

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Section: ͑15͒mentioning

confidence: 73%

Section: Angular Displacementmentioning

confidence: 99%

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Role of the demagnetizing field on the EPR of organic radical magnets

et al. 1997

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“…However, H-bonds are known for their ability to transfer ferromagnetic coupling in molecular organc crystals [32]. The transition to magnetic ordering may occur in our samples because the concentration of implanted hydrogen in them is ≈1.6⋅10 21 cm -3 .…”

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confidence: 98%

Optical and paramagnetic properties of natural diamonds implanted with hydrogen ions

et al. 2007

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We used IR spectroscopy and electron spin resonance (ESR) to investigate defect reconstruction processes occurring in diamond crystals due to their implantation with H + ions with energies of 65-350 keV and subsequent isochronous annealing in the temperature range 250-1550 o C. We found that most of the hydrogen in diamonds implanted with protons is in an IR-inactive state. Magnetic hysteresis related to radiation defects in diamond is observed for the first time at room temperature using ESR.

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“…[46] Another challenging part of the design of OMMs is a control of intermolecular magnetic interactions. [47][48][49][50] A proper control of intermolecular magnetic interactions between single magnetic molecules in a solid-state structure is crucial to preserve the high-spin nature. Thorough reviews on the design aspects of high-spin organic and metal-organic materials in this context are provided by Miller and Epstein [1] , Rajca [6] , Ratera and Veciana [51] and a recent book by Datta et al [52] Here, among many branches of the design strategy, detailed elucidation of classification, and standardization schemes for magnetic strength of organic radicals and couplers are provided as supplement to those efforts toward strongly coupled high-spin organic molecules.…”

Section: A Rational Design Strategy For Organic Diradicals General Asmentioning

confidence: 99%

Quantum chemical approaches for controlling and evaluating intramolecular magnetic interactions in organic diradicals

Cho

Lee

2015

Int J of Quantum Chemistry

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In this review, rational design strategies for pure organic highspin molecules with strong intramolecular magnetic interactions are presented, mostly focusing on the design of ferromagnetically coupled organic diradicals. After brief introduction of the calculation procedure for intramolecular magnetic coupling constant J using density functional theory (DFT), classification and standardization of magnetic character of well-known stable radicals and coupler units are discussed. Following the development of general strategy for the design of organic high-spin diradical by means of the classification and standardization scheme, applicability of the strategy for making pendent-type organic polyradical using zigzag graphene nanoribbons backbone is demonstrated. In a computational point of view, a scaling procedure and an optimization of Hartree-Fock exact exchange ratio of a hybrid DFT functional for better prediction of the J of diradicals are discussed.

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Role of hydrogen bonds in the propagation of ferromagnetic interactions in organic molecular solids. Part 1.—The p-hydroxyphenyl α-nitronyl aminoxyl radical case

Cited by 80 publications

References 49 publications

Role of the demagnetizing field on the EPR of organic radical magnets

Role of the demagnetizing field on the EPR of organic radical magnets

Optical and paramagnetic properties of natural diamonds implanted with hydrogen ions

Quantum chemical approaches for controlling and evaluating intramolecular magnetic interactions in organic diradicals

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