A slow relaxing species for molecular spin devices: EPR characterization of static and dynamic magnetic properties of a nitronyl nitroxide radical

Abstract

Nitronyl nitroxides (NitR) are a family of persistent radicals widely used in molecular magnetism and recently suggested as potential candidates for spintronic applications. In this paper we characterize by X- and W- band Electron Paramagnetic resonance (EPR) spectroscopy the new radical S-4-(nitronyl\ud nitroxide) benzyl ethanethioate (NitSAc) designed for assembling on Au surfaces. We determined the radical magnetic tensors and studied by X-band pulse EPR its spin relaxation behaviour in fluid and glassy solutions of toluene. A comparison with the well known nitroxide 3-carbamoyl- 2,2,5,5-tetramethyl-3-pyrrolin-1-oxyl (CTPO) is afforded. The advantages of using NitSAc in\ud technological applications are discussed on the basis of the slow spin relaxation demonstrated by this study

Magnetic edge states and coherent manipulation of graphene nanoribbons

“…11,12 We overcome these problems by injecting a spin density into the edge states of stable molecular GNRs synthetized via solution-based bottom-up chemical methods, using nitronyl-nitroxide radicals 13 (NIT) as magnetic injectors. The advantages of this approach are that: the magnetic functionalities are well known, 14 instead of relying on still-undefined magnetic states and they show interesting quantum properties; 15 the sample can be mass-produced, instead of appearing just on one device; and we can test the classical and quantum spin properties in depth; the systems are chemically very stable.…”

Quantum coherence in a processable vanadyl complex: new tools for the search of molecular spin qubits

“…Molecular spin based qubits, on the contrary, can be organized on surfaces and the interaction between them tuned at will through a rational synthetic design. After an extensive research on polynuclear transition metal complexes 16 , 23 , 24 optimized to exhibit a long T m , the research in this field has recently focused back on the simplest spin S = 1/2 systems constituted either by organic radicals 25 or by 3d transition metal ions. 26 – 28 These have relatively long T m , in particular at high temperature, because there are no excited spin levels that can foster the magnetic relaxation when thermally populated.…”

2‐(8‐Iodonaphthalen‐1‐yl)‐Substituted Nitronyl Nitroxide: Suppressed Reactivity of Iodine Atom and Unusual Temperature Dynamics of the EPR Spectrum

“…The components of the HFC tensors for nitrogen atoms are virtually equivalent, with the exception of the lowest temperature, 150 K, and within experimental accuracy, all the parameters match the literature data on nitronyl nitroxides that do not contain the iodine atom. [20][21][22] We failed to simulate high-temperature EPR spectra (at 250-300 K) under the assumption that the nonequivalence of nitrogen atoms increases with temperature to give two substantially different a iso ( 14 N). Nevertheless, these spectra can be reasonably simulated by taking into account an additional HFC constant of 127 I.…”