Acta Phys. -Chim. Sin. ›› 1992, Vol. 8 ›› Issue (04): 545-549.doi: 10.3866/PKU.WHXB19920424

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Crystal Structures of 1,2-Dimethyl-3-Indolmethyl-Idene Succinic Fulgide Anhydride and 1,2-Dimethyl-3-Indolylethylidene Succinic Fulgide Anhydride

Fan Guang-Yu; Wang Huan-Zhong; Cui Xiu-Shan; Li Yun-Zheng; Zhu He-Sun   

  1. Department of Chemical Engineering, Beijing Institute of Technology, Beijing 100081
  • Received:1991-03-22 Revised:1991-10-08 Published:1992-08-15
  • Contact: Fan Guang-Yu

Abstract: The crystal structures of 1,2-dimethyl-3-indolylmethylidene succinic fulgide anhydride (1) and 1,2-dimethyl-3-indolylethylidene succinic fulgide anhydride(2) were determined by singe crystal X-ray diffraction analysis. The crystal data are C_(18)H_(17)NO_3(1), orthogonal space group Pbca, with a=1.0084(3) nm, b=1.3966(4) nm, c=2.0945(6) nm, V=2.9498(15) nm, Z=8; C_(19)H_(19)NO_3 (2), orthogonal space group Pbca, with a=0.7988(3) nm, b=2.5782(10) nm, c=1.5664(5) nm, V=3.2259(22) nm, Z=8. R values are 0. 047 for (1) and 0.059 for (2) respectively.
The photochemical properties of (1) and (2) were reported. Compound (1) is nonphotochromic, compound (2) changed from pale yellow to blue or green on irradiation at 365 nm or on exposure to indoor UV light either in crystal state or in solution (liquid or rigid plastic matrix).
The differences in photochromic properties of compound (1) and (2) were discussed.

Key words: Crystal structure, Photochromic properties, Fulgide anhydride, X-ray diffraction