Abstract
The title compound, IBA-PIC, is 2C12H13NO2·2C6H3N3O7, triclinic,P¯1,a=7.137(1),b=15.355(4),c=18.282(5) Å,α=79.72(2),β=79.85(2), γ=76.87(2)°. The structure was solved by direct methods and refined by least-squares techniques to anR factor of 0.068 for 3395 observed reflections. The IBA-PIC complex occurs as two independent molecules with different conformations. The crystallographic evidence for a prominent overlapping between the phenyl and indole rings corroborates earlier conclusions from UV spectroscopy. Molecules of both IBA and picric acid lie approximately parallel to (100) in layers and π-bonding interactions across the 3.55 Å spacing. The angles between the indole ring and carboxyl-group planes are 82.9 and 86.9° for the A and B molecules, respectively.
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Soriano-García, M., Toscano, R.A. & Schatz-Levin, M. Crystal and molecular structure of 4-(3-indolyl)butyric acid-picric acid 2/2 π complex. Journal of Crystallographic and Spectroscopic Research 17, 207–219 (1987). https://doi.org/10.1007/BF01160912
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DOI: https://doi.org/10.1007/BF01160912