Issue 8, 2005

Intramolecular exchange interactions in non-aromatic bis-nitronyl-nitroxides

Abstract

Two bis-nitronyl-nitroxides linked by unsaturated non-aromatic spacers have been synthesized and investigated: 3D-NIT2 and DTD-NIT2. The magnetic properties of these diradicals have been investigated in the crystalline state by SQUID magnetometry and in dilute solution by EPR spectroscopy. According to magnetic measurements in the crystalline state both compounds experience strong antiferromagnetic exchange interactions. The singlet–triplet splitting has been estimated as ΔEST = 95 K for 3D-NIT2, and ΔEST = 75 K for DTD-NIT2. Solid-state MAS NMR spectroscopy has been used to determine the spin densities at the 1H and 13C nuclei of DTD-NIT2, thereby establishing spin polarization as the origin of the magnetic properties. The synthesis of an analogous mono-nitronyl-nitroxide has been undertaken in order to investigate the large intermolecular magnetic interactions observed in the crystalline state for 3D-NIT2.

Graphical abstract: Intramolecular exchange interactions in non-aromatic bis-nitronyl-nitroxides

Supplementary files

Article information

Article type
Paper
Submitted
15 Sep 2004
Accepted
01 Nov 2004
First published
08 Dec 2004

J. Mater. Chem., 2005,15, 850-858

Intramolecular exchange interactions in non-aromatic bis-nitronyl-nitroxides

C. Stroh, R. Ziessel, G. Raudaschl-Sieber, F. H. Köhler and P. Turek, J. Mater. Chem., 2005, 15, 850 DOI: 10.1039/B414284E

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