Tris(2,3-naphthalenedioxy)cyclotriphosphazene (II) forms channel inclusion adducts with a number of organic molecules. An X-ray single-crystal study of a benzene adduct has shown that at 23° the benzene molecules are disordered and are probably tumbling within the channels, with six benzene molecules being close packed in the channel space within each unit cell. The unit cell is hexagonal, with space group P63/m, and with a = 15.726 (8) Å, c = 10.076 (6) Å, and Z = two host and six benzene molecules. The structure was solved by Patterson, Fourier, and difference syntheses, and refinement to an R index of 0.10 was accomplished by difference-Fourier and least squares techniques. The mean bond distances and angles within the spirophosphazene molecule are P-N = 1.56 (2) Å, P-O = 1.61 (1) Å, N-P-N = 116 (1)°, P-N-P = 124 (1)°, N-P-O = 111 (1)°, and O-P-O = 96 (1)°. The phosphazene ring is planar with the phenylenedioxyphosphole unit lying in a plane that bisects the N-P-N angle. However, the naphthalene unit is bent 2.5° at the bond which joins the two phenyl residues.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry