SYNTHESES AND STRUCTURES OF CYCLIC AND SHORT-CHAIN LINEAR PHOSPHAZENES BEARING 4-PHENYLPHENOXY SIDE GROUPS

A series of cyclic and short-chain linear phosphazenes bearing the 4-phenylphenoxy side group has been synthesized. These compounds are models for the corresponding linear high polymer. The X-ray structures of [NP(O-C6H4-C6H5-p)2]3 (1), [NP(O-C6H4-C6H5-p)2]4 (2), and OP3N2(O-C6H4-C6H5-p)7 (6) are reported. Compound 6 represents the first three-phosphorus linear oligomeric phosphazene-bearing aryloxy side group to be described. The molecular structure of 6 showed that the linear phosphazene skeleton assumes a distorted cis-trans conformation. Crystals of 1 are monoclinic with space group P2(1)/c with a = 23.296 (6) angstrom, b = 7.762 (4) angstrom, c = 34.666 (7) angstrom, beta = 90.14 (2)-degrees, V = 6268.4 angstrom-3, and Z = 4. Crystals of 2 are triclinic of space group P1 with a = 10.462 angstrom, b = 16.433 angstrom, c = 23.326 angstrom, alpha = 94.25 (2)-degrees, beta = 91.03 (3)-degrees, gamma = 103.59 (3)-degrees, V = 3883.9 angstrom-3, and Z = 2. Finally, crystals of 6 are monoclinic with space group P2(1)/n with a = 10.413 (9) angstrom, b = 23.425 (9) angstrom, c = 36.359 (12) angstrom, beta = 96.27 (6)-degrees, V = 8815.77 angstrom-3, and Z = 4.