Abstract
The title compound, C35H36N4O4, was prepared as a spirolactam ring formation of rhodamine B dye for comparison with a ring-opened form. The xanthene ring system is approximately planar. The r.m.s. deviation from planarity is 0.064 (6) Å for the xanthene ring. The dihedral angles formed by the spirolactam and 2,4-dihydroxybenzene rings with the xanthene ring system are 86.6 (9) and 88.0 (9)°, respectively.
Highlights
The title compound, C35H36N4O4, was prepared as a spirolactam ring formation of rhodamine B dye for comparison with a ring-opened form
The dihedral angles formed by the spirolactam and 2,4-dihydroxybenzene rings with the xanthene ring system are 86.6 (9) and 88.0 (9), respectively
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: JH2147)
Summary
Key indicators: single-crystal X-ray study; T = 296 K; mean (C–C) = 0.007 A; R factor = 0.071; wR factor = 0.216; data-to-parameter ratio = 13.5. The title compound, C35H36N4O4, was prepared as a spirolactam ring formation of rhodamine B dye for comparison with a ring-opened form. The xanthene ring system is approximately planar. The r.m.s. deviation from planarity is 0.064 (6) Afor the xanthene ring. The dihedral angles formed by the spirolactam and 2,4-dihydroxybenzene rings with the xanthene ring system are 86.6 (9) and 88.0 (9), respectively. Related literature For the structures of rhodamine derivatives bearing a lactam moiety, see: Deng et al (2009); Kwon et al (2005); Tian & Peng (2008); Wu et al (2007); Xu et al (2009); Zhang et al (2008)
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