The title compound, [CuCl(C16H14N4)(2)]ClO4, consists of a mononuclear comp
lex cation and a perchlorate anion. The coordination of the copper(II) ion
exhibits a trigonal bipyramidal geometry, where the equatorial plane is com
posed of the Cl atom and two N atoms of the two pyridazine rings, and the a
xial positions are occupied by the N atoms of two methylpyridine rings.