6-Oxo-2,2,4,4,6-pentaphenoxycyclotri-lambda 5-phosphazane-1,3-diene.

C30H26N3O6P3, Mr = 617.48, monoclinic, P2(1)/n, a = 13.200(4), b = 16.714(3), c = 13.438(9) A, beta = 96.38(3) degrees, V = 2946.3 A3, Z = 4, Dx = 1.392 Mg m-3, lambda (Mo K alpha) = 0.71073 A, mu = 0.23 mm-1, F(000) = 1280, T = 293(1) K, R = 0.037 for 4089 observed data with I greater than 3 sigma (I). The P3N3 ring has a boat conformation with a P atom and an N atom 0.396(1) and 0.118(2) A, respectively, out of the plane of the remaining atoms of the ring. One of the P atoms involves a double bond P = O [1.470(1) A] and a P-N single bond [1.683(1) A]. The P-O single bonds and P-N ring bonds range between 1.564(1) and 1.5941) A [mean 1.576(1) A] and 1.546(1) and 1.607(1) A [mean 1.574(1) A], respectively.