Date Published: July 01, 2012
Publisher: International Union of Crystallography
Author(s): Chang-Bin Guo, Ri-Cai He, Ai-Min Li.
In the title compound, C33H38N4O3, the mean planes of the 9H-xanthene unit and spirolactam (nine-atom) core are almost mutually perpendicular at 87.26 (6)°. Intramolecular N—H⋯O and C—H⋯N interactions influence the 4-oxopent-2-en-2-ylamino conformation. In the crystal, weak C—H⋯O hydrogen bonds link the molecules into chains along .
For the use of Rhodamine B derivatives as fluorescent chemosensors, see: Zhang et al. (2007 ▶); Soh et al. (2007 ▶). For a related structure, see: Xiang et al. (2006 ▶).