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Science 16 November 2001:
Vol. 294. no. 5546, pp. 1503 - 1505
DOI: 10.1126/science.1065477
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Reports

Magnetic Ordering in an Organic Polymer

Andrzej Rajca,* Jirawat Wongsriratanakul, Suchada Rajca

We describe preparation and magnetic properties of an organic pi -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 = 1/2 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.

Department of Chemistry, University of Nebraska, Lincoln, NE 68588-0304, USA.
*   To whom correspondence should be addressed. E-mail: arajca1{at}unl.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)