Thermisch induzierte Bewegungsvorgänge in kristallinen Guanidiniumhexafluorometallaten, (C(NH2)3)3MF6 (M = Al,Ga, In) — eine in situ ESR-Untersuchung

Thermally Induced Mobility in Crystalline Guanidinium Hexafluorometallates, (C(NH₂)₃)₃MF₆ (M = Al, Ga, In) — an in situ E.S.R. Study . The e.s.r. spectroscopic investigation of the title compounds was carried out most successfully by doping them with Cr^III ions. The metal ions in the centres of the MF₆ octahedra are substituted by the Cr^III ions. The zero field splitting parameter | D |, being a measure of the axial distortion of the CrF₆ octahedra, has been determined by fitting the calculated to the experimental resonant field values using a computer program. | D | decreases with increasing temperature. This process is completely reversible in the investigated temperature range of ? 190°C to 270°C. It is explained in terms of the thermally induced movability of the N? H … F network.