Copyright (c) 2008 University of Nebraska - Lincoln All rights reserved. http://digitalcommons.unl.edu/chemistryrajca Recent documents in Andrzej Rajca Publications en-us Wed, 13 Feb 2008 02:12:26 PST 3600 http://digitalcommons.unl.edu/chemistryrajca/4 http://digitalcommons.unl.edu/chemistryrajca/4 Mon, 11 Feb 2008 11:08:21 PST We describe preparation and magnetic properties of an organic p-conjugated polymer with very large magnetic moment and magnetic order at low temperatures. The polymer is designed with a large density of cross-links and alternating connectivity of radical modules with unequal spin quantum numbers (S), macrocyclic S = 2 and, cross-linking S = ½ modules, which permits large net S values for either ferromagnetic or antiferromagnetic exchange couplings between the modules. In the highly cross-linked polymer, an effective magnetic moment corresponding to an average S of about 5000 and slow reorientation of the magnetization by a small magnetic field (less than or equal to 1 oersted) below a temperature of about 10 kelvin are found. Qualitatively, this magnetic behavior is comparable to that of insulating spin glasses and blocked superparamagnets. Andrzej Rajca