Oxazine 1 perchlorate is a symmetric cationic dye (λex=653 nm, λem=666 nm).
Oxazine 1 perchlorate (OX1) absorbs and emits light at about 653 and 666 nm in dilute aqueous solutions, respectively. It is soluble over a very wide range of polar solvents. The optical spectrum of Oxazine 1 perchlorate typically possesses an intense absorption band (λmax), which is neighbored by a shoulder at shorter wavelengths. Oxazine 1 perchlorate appears to exist almost in its monomeric form at concentrations below about 1×10-4 M in aqueous solutions. As it is expected, similar to polar ordinary liquid solvents, Oxazine 1 perchlorate shows only single fluorescence band in polar anisotropic media[1].
[1]. Gilani AG, et al. Estimation of ground- and excited-state dipole moments of oxazine 1 in liquid and liquid crystalline media. Spectrochim Acta A Mol Biomol Spectrosc. 2011 Jun;79(1):148-55.