THE SELF-ASSEMBLY OF HYDROXYLATED PHENYL u-NITRONYL NITROXIDE RADICALS Control ofthe Crystal Packing and Formation of Nanoscopic Aggregates in Solution Through Hydrogen Bonds

Content Provider	Semantic Scholar
Author	Rovira Stanger, Janice Turek, Ph.
Abstract	The research of purely organic molecular magnetic materials is an area of increasing activity since the discovery of the first example of a purely organic ferro magnet. [1;2] The enormous interest that these kind of materials motivate in the scientific community is mainly due to the new and unexpected properties that they may exhibit. In this sense, the combination between a macroscopic magnetic property, like ferromagnetism, and the intrinsic properties of organic compounds (i.e. optical transparency, low density, or optical activity of chiral centers) may open the way to a new and fascinating world of new materials exhibiting unique properties. Generally speaking, a macroscopic physical property of a molecular material, either crystalline or amorphous, is related to the microscopic arrangement of its constituent building blocks -the moleculesin the solid state. Thus, the simplest properties of a solid, e.g. its density, can be explained by the microscopic molecular arrangement. Much more complex and interesting properties of molecular solids, Iike the magnetic ones, are also a consequence of the relative arrangement of molecules, since they control the intermolecular electronic interactions which are ultimately responsible for the macroscopic magnetic properties. Accordingly, there is a great need to control, as far as possible, the intermolecular arrangement in a crystal structure in order to rule the magnetic behavior of the solid. It is weil known that the relative molecular arrangement in a crystalline molecular solid is a consequencc of several structural factors and numerous subtle intermolecular forces. [3] Coulombic attractive forces, [4] hydrogen bonds, [5] 1t-1t stacking and van der Waals forces are the most often used forces in the attempts to direct the packing of a given purely organic molecular material. There is still a long way to go in order to produce tailor-made molecular magnetic materials; i.c. designed materials with predefined macroscopic magnetic properties. The
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