Magnetic Transition of Wurster's Blue Perchlorate. I. The Low-Temperature Phase

Evidence is given for the low-temperature phase of Wurster's blue perchlorate being built up of bipositive ions and neutral molecules, the high-temperature phase having undergone disproportionation according to 2 TMPD+→TMPD+TMPD++. The electronic as well as the ESR spectra can be explained on this basis. The actual transfer of charge required in the disporportionation can be observed as a conductivity peak in the transition range.