Structure of cis-5,5-di­chloro-1,3-di­phenyl-1λ6,3λ6,2,4,6,5λ5-di­thiatri­aza­phosphorine 1,3-dioxide

C12H10C12N302PS2, Mr=394.22, triclinic, P1, a = 9.8757 (4), b= 9.9319 (4), c= 17.219 (1)A, ct= 96.183 (4), fl= 96.283 (4), y= 76.525 (3) °, V= 1626.6(1)A 3, Z=4, Dx=1.610gcm -3, 2(MoKtx) = 0.71073 A, p = 7.5 cm -1, F(000) = 800, T= 295 K, R = 0.042 for 4018 observed reflections. The unit cell contains two independent molecules, both with a skew-boat conformation of the inorganic ring. Phenyl substituents are in cis positions. Mean bond lengths are N-P = 1.573 (3), N-S = 1.575 (3), S-O = 1.428 (1), S-C = 1.761 (2), P-Cl= 1.981 (2) and C-C = 1.374 (2) A. The average endocyclic angles at P and S are 118.4 (2) and 112.3 (1) ° respectively. The endocyclic angles at N range from 121.2 (2) to 122.6 (2) °