Abstract

The fine-tuning of the intra-molecular exchange interactions in π-conjugated nitronyl nitroxide biradicals and their crystalline network formation is described.

Highlights

  • Coupled spin–dimer systems composed of closelyspaced pairs of spin-1/2 carrying entities, have been used as model systems for exploring critical phenomena under wellcontrolled conditions.[1]

  • Various approaches toward molecular magnets can be classi ed into inorganic and organic ones, where the spins are provided by metal ions, the so-called “metal-radical” or hybrid approach, which combines magnetically active metal ions and persistent organic radicals as ligands,[3,4] and the organic aMax Planck Institute for Polymer Research, Ackermannweg 10, 55128

  • In this study a series of novel nitronyl nitroxide biradicals 1c–4c coupled via modi ed tolane linkers was synthesized and their magnetic behaviour was studied

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Summary

Introduction

Coupled spin–dimer systems composed of closelyspaced pairs of spin-1/2 carrying entities, have been used as model systems for exploring critical phenomena under wellcontrolled conditions.[1]. Chemistry techniques permits to perform structural modi cations in organic materials in order to control the intra- and inter-molecular exchange interactions between the spin carriers.[5] the former can be designed and adjusted through synthesis of different conjugated bridges between the spin-containing sites, the latter requires supramolecular approaches employing hydrogen bonding, pstacking, and metal complexation. Such tunability is unprecedented in most of the traditional inorganic materials and is the key to obtain materials with unique magnetic properties. We report the synthesis of biradicals 1c–4c, designed for the ne tuning of spin exchange interactions, their characterization, including X-ray structural analysis, and, nally, the magnetic studies, which are discussed with respect to the quantum chemical calculations based on a broken symmetry DFT approach

Results and discussion
Conclusions
General procedure of the condensation reaction between
Stable Radicals
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