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Figure 6
(a) View of the TAAP crystal structure at RT projected onto the (001) plane, parallel to the largest face of the crystal used for the fluorescence experiment (H atoms and phenyl rings at C3 and C5 have been omitted for clarity and displacement ellipsoids are drawn at the 30% probability level). The maximum fluorescence was observed with the analyzer approximately along [110]; the distances between gravity centres of molecules in the dimer (3.495 Å for TAAP_RT and 3.417 Å for TAAP_LT) are shown as turquoise lines. The orientation of the polarizers (compare with Fig. 5[link]), approximately along [1[\overline{1}]0] and [110], are marked by red lines. (b) Normalized absorption and fluorescence spectra for the solution of TAAP in toluene (solid line) and for the TAAP polycrystalline sample (double-dashed line). (c) The fluorescence three-dimensional image of the TAAP single crystal (λex = 405 nm). Inset: fluorescence spectrum for a TAAP single crystal (λex = 405 nm).

IUCrJ
Volume 5| Part 3| May 2018| Pages 335-347
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518001987