Structures of benzo[a]phenothiazine and benzo[c]phenothiazine

Benzo[a]phenothiazine (I), C 16 H 11 NS, M r =249.3, monoclinic, P2 1 /a, a=25.269 (2), b=23.347 (2), c=8.306 (2) A, β=91.71 (1) o , V=4898 (1) A 3 , Z=16, D m =1.35, D x =1.35 Mg m -3 , λ(Mo Kα)=0.71073 A, μ=0.23 mm -1 , F(000)=2080, T=293 K, R=0.069 for 4248 observed reflections. Benzo[c]phenothiazine (II), C 16 H 11 NS, M r =249.3, monoclinic, P2 1 /a, a=19.703 (3), b=23.347 (2), c=11.523 (1) A, β=95.48 (1)°, V=1212.5 (4) A 3 , Z=4, D m =1.39, D x =1.37 Mg m -3 , λ(MoKα)=0.71073A, μ=0.23 mm -1 , F(000)=520, T=293K, R=0.047 for 2685 observed reflections