Abstract
The title thia-zole orange derivative, bearing an alkene substituent, crystallized as a monohydrate of its iodide salt, namely, (Z)-1-(hex-5-en-1-yl)-4-{[3-methyl-2,3-di-hydro-1,3-benzo-thia-zol-2-yl-idene]meth-yl}quinolin-1-ium iodide monohydrate, C24H25N2S+·I-·H2O. The packing features aromatic π-stacking and van der Waals inter-actions. The water mol-ecule of crystallization inter-acts with the cation and anion via O-H⋯N and O-H⋯I hydrogen bonds, respectively.