Perfluorocarbon-hydrocarbon self-assembly. Part 6: alpha,omega-diiodoperffuoroallcanes as pseudohalogens in supramolecular synthesis

4,4'-Bipyridine 1 works as an electron donor to alpha,omega-diiodoperfluoro alkanes 2a-d and gives infinite chains 3a-d as white, crystalline solids wh ich are stable at room temperature and in air. The structural features of t hese noncovalent co-polymers have been studied using various techniques (IR , Raman, F-19 NMR, DSC, X-ray) and parallel strictly those of analogous co- crystals given by halogens, interhalogens, and pseudohalogens. The close an alogy between alpha,omega-diiodoperfluoroalkanes and halogens and pseudohal ogens allows the use of the literature data on aggregation abilities of the latter compounds to anticipate those of the former ones. (C) 1999 Elsevier Science Ltd. All rights reserved.