POLYMERIC HYDROGEN-BONDED SUPERMOLECULES BY SELF-ASSEMBLING OF HEXAKIS(4-PYRIDYLCARBINOXY)CYCLOTRIPHOSPHAZENE AND DICARBOXYLIC-ACIDS

Hexakis(4-pyridylcarbinoxy)cyclotriphosphazene (PyPN) and terephthalic acid (TPA) self-assembled into polymeric supermolecules through hydro gen bonding between carboxyl and pyridyl groups. Two supermolecular se lf-assemblies were obtained: crystals 1 composed of 2:1 TPA/PyPN from DMF/DMSO, and crystals 2 composed of 3:1 TPA/PyPN from DMF. The former is monoclinic, space group C2/c with a=26.029 Angstrom, b=7.854 Angst rom, c=28.073 Angstrom, beta=116.47 degrees,V=5138 Angstrom(3), and Z= 4. The structure was defined to R=0.064 based on 2832 data, I>1.5 sigm a(I). The X-ray analysis revealed that PyPN is joined with two TPA mol ecules through hydrogen bonding to form a polymeric assembly. The self -assembly obtained from DMF seems to take a cylindrical-shaped structu re, i.e., all of pyridyl group in PyPN participate in the formation of the assembly, as evidenced by elemental analysis, FT-IR spectroscopy and X-ray diffraction data. These results and the role of the solvent are described.