The intercalation of CuAl2Cl8 into graphite by action of the gaseous heterocomplex begins with the preintercalation of AlCl3 to form a first stage AlCl3-GIC. Subsequently, the copper dichloride is cointercalated by chemical transport via a gaseous complex in a iso-stage process to give the saturated C(22)CuAl(2)Clg(8.5) compound. Thermal analyses (TGA and DTA) show a high stability decrease of the intercalated heteromolecule CuAl2Cl8 as compared to that in the free state. Studies of the in-plane structure of the intercalant (Laue technique and electron diffraction on single crystals) indicate an oblique cell with the lattice constants a=2.566nm, b=0.658nm and gamma=112 degrees.