Structure of trans-5-iodo-5-iso­propyl-1,3-di­phenyl-1λ6,3λ6,2,4,6,5λ5-di­thiatri­aza­phosphorine 1,3-dioxide

C15HITIN302PS2, Mr= 493.33, orthorhombic, Pna2,, a= 16.895 (1), b= 10.589 (1), c= 10-513(1),(, V= 1880.8(3)A 3, Z=4, Dx= 1-742 g cm -3, Mo Ka, ,;I, = 0.71073 A, ~t = 19.9 cm -~, F(000)=976, T= 295 K, R =0.036 for 1363 observed reflections with I > 2.5a(I). The inorganic ring skeleton possesses a twist-boat conformation with the phenyl substituents in trans positions. The endocyclic bond lengths reflect double-bond character caused by d~-p~ overlap [S(1)-N(2) 1.602(6), N(2)-S(2) 1.580 (6), S(2)-N(3) 1.554 (5), N(3)-P 1.608 (6), P-N(1) 1.610 (6), N(1)--S(1)1.558 (5) A]