Ideas on the Addition of AlCl3 to (MClx · nAlCl3) Complexes It is postulated, that the addition of AlCl3 to gaseous (MClx · nAlCl3) complexes in which M is saturated in respect to its coordination, is (approximately) independent thermodynamically upon the nature (and charge) of M. Generally holds if M has the coordination number 6 This provides an useful test, when complicated systems have been measured. Literature data have been examined in this sense.