Synthesis and Crystal Structure of 4-(2-Methylene-1-ethyl-3,3-dimethylindoline-2'-yl)-6,8-dibromo- 1'-ethyl-3',3'-dimethylspiro-[3,4-dihydro-2H-1-benzopyran-2,2'-indoline]

The title compound of 4-(2-methylene-1-ethyl-3,3-dimethylindoline-2'-yl)-6,8-dibro-mo-1'- ethyl-3',3'-dimethylspiro3,4-dihydro-2H-1-benzopyran-2,2'-indoline],C33H36Br2N2O,as a dicondensed spiropyran (DC) has been synthesized by indoline in ethanol with 3,5-dibromo-salicyaldehyde.The compound was characterized by elemental analysis and IR spectra.Meanwhile,the crystal of the compound was obtained and determined by X-ray single-crystal diffraction.Crystal data: monoclinic system,space group P21/n,a=12.9699(15),b=12.5196(13),c=19.327(2) (A),β=106.493(3)°,Mr=636.46,V= 3009.1(6) (A)3,Z=4,F(000)=1304,Dc=1.405 g/cm3,μ=2.722 mm-1,R=0.0554 and wR=0.1176 for 6892 independent reflections (Rint=0.0354) and 5699 observed reflections (I>2σ(I)).