title: 3',6'-Bis(ethyl-amino)-2',7'-dimethyl-2-{[2-[(E)-3,4-methyl-enedioxy-benzyl-idene-amino]eth-yl}spiro-[isoindoline-1,9'-xanthen]-3-one.
abstract: The title compound, C(36)H(36)N(4)O(4), was prepared as a spiro-lactam ring formation of the rhodamine dye for comparison with a ring-opened form. The xanthene ring system is approximately planar [r.m.s. deviations from planarity = 0.023 (9) Å for the xanthene ring]. The dihedral angles formed by the spiro-lactam and 1,3-benzodioxole rings with the xanthene ring system are 86.8 (1) and 74.3 (1)°, respectively.
authors.forename: Zhi-Hong
authors.initials: ZH
authors.lastname: Xu
authors.forename: Hong-Sheng
authors.initials: HS
authors.lastname: Wang
authors.forename: Lian-Ting
authors.initials: LT
authors.lastname: Tao
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Wang