CONTROL OF THE STRUCTURAL DIMENSIONALITY IN HYDROGEN-BONDED SELF-ASSEMBLIES OF OPEN-SHELL MOLECULES - EXTENSION OF INTERMOLECULAR FERROMAGNETIC INTERACTIONS IN ALPHA-PHENYL NITRONYL NITROXIDE RADICALS INTO 3 DIMENSIONS

The variation of the number and position of OH substituents at the phe nyl ring of alpha-phenyl nitronyl nitroxide radicals yields different hydrogen-bonded molecular self-assemblies with distinct dimensionaliti es; the mono-ortho-substituted isomer is most remarkable since it show s a three-dimensional network of weak hydrogen bonds exhibiting a bulk ferromagnetic transition at 0.45 K.