Construction of polymeric self-assembly based on 2 lambda(5),4 lambda(5),6lambda(5)-cyclotriphosphazene and its inclusion behavior of iodine

The self-assembling of 2,2,4,3,6,6-hexakis(4-pyridylmethoxy)-2 lambda (5), 4 lambda (5), 6 lambda (5)-cyclotri(phosphazene) (PyPN) and 1, 4-naphthalen edicarboxylic acid (DCN) in DMF gives needle-like crystals. From elemental analysis, the stoichiometry of the crystal was PyPN/DCN = 1:3. The FT-IR, f luorescence and X-ray diffraction data showed that the self-assemblies [PyP N 3(DCN)ln (1) formed by the hydrogen bonding with an alternating sequence of one PyPN and three DCN molecules take a cylindrical structure and are la terally packed into a hexagonal arrangement, where the naphthalene rings ar e placed to avoid steric congestion. The assembly 1 has an ability to inclu de iodine molecules. From FT-Raman spectroscopy, the iodine in 1 was found to exist as a polyiodine linear I-5(-) ion, indicating that the crystal of 1 has a tunnel-like void.