FERROMAGNETIC ORDER IN A NOVEL IMINO NITROXIDE (IT)PY(C-CH) RADICAL DERIVED FROM 2-ETHYNYL-PYRIDINE

Purely organic ferromagnets are rare, the main problem being the relat ive orientation of the spins in a three-dimensional network. The first example of ferromagnetic ordering in an imino-nitroxide radical is re ported. A detailed analysis of the structure reveals that CCH-O hydrog en bonds are responsible for both the crystal packing and the ferromag netic spin interactions within an infinite chain of ordered molecules. This radical is unique: its structure is the first demonstration of t he use of terminal acetylenes to generate supramolecular networks.