Synthesis, Optical Properties and Magnetic Studies of 2,6-Bis(pyrazolylmethyl)pyridine Functionalized with Two Nitronyl Nitroxide Radicals
✍ Scribed by Giorgio Zoppellaro; Ahmed Geies; K. Kristoffer Andersson; Volker Enkelmann; Martin Baumgarten
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 946 KB
- Volume
- 2008
- Category
- Article
- ISSN
- 1434-193X
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✦ Synopsis
Abstract
The synthesis, optical properties, spin‐polarization path and magnetic ground‐state studies of a novel nitronyl nitroxide biradical system based on the 2,6‐bis(pyrazolylmethyl)pyridine unit is reported. Besides the presence of σ conjugation and a non‐alternant pathway for spin polarization through the core as a coupling unit, the through‐bond ferromagnetic interaction between spin carriers, although weak (0.06 cm^–1^ < Δ__E__~ST~ = 2__J__/k~B~ < 0.6 cm^–1^), is preserved. It vanishes (2__J__/k~B~ ≈ 0) upon coordination with Zn^2+^ metal ions, but is restored upon Zn^2+^ depletion with EDTA. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)