Research Article: 3′,6′-Bis(ethyl­amino)-2′,7′-dimethyl-2-{2-(E)-[(thio­phen-2-yl)methyl­idene­amino]­eth­yl}spiro­[isoindoline-1,9′-xanthen]-3-one methanol monosolvate

Date Published: May 01, 2012

Publisher: International Union of Crystallography

Author(s): Qing-yu Li, Rui Guo, Zhi-hong Xu.


The title compound, C33H34N4O2S·CH3OH, was prepared as a spiro­lactam ring formation of rhodamine 6 G dye for comparison with a ring-opened form. The xanthene and spiro­lactam rings are approximately planar [r.m.s. deviations from planarity = 0.122 (3) and 0.072 (6) Å, respectively]. The dihedral angles formed by the spiro­lactam and thio­phene rings with the xanthene ring system are 89.7 (6) and 86.5 (2)°, respectively. The crystal structure features N—H⋯O and C—H⋯O hydrogen bonds.

Partial Text

For rhodamine derivatives bearing a lactam moiety, see: Tian & Peng (2008 ▶); Wu et al. (2007 ▶); Xi et al. (2011 ▶); Xu et al. (2009 ▶, 2011 ▶); Xu, Guo et al. (2010 ▶); Xu, Zhang et al. (2010 ▶); Zhang et al. (2008 ▶).