EPR of Cu(H2O) 2+6 pseudo Jahn‐Teller (JT) centres in dia‐ and paramagnetic Tutton salt crystals A2M(SO4)2. 6H2O (I) with A = Rb, Cs, NH4 and M=Zn, Cu and K2M(ZrF6)2. 6H2O (II) crystals in the temperature range 300 to 4.2 K at frequencies 9.5 and 37 GHz is studied. The dynamic JT nature of Cu(H2O) 2+6 centres in the whole class of Tutton salt crystals is established basing on the results of EPR study and X‐ray data. The influence of the lowering of lattice symmetry on the configuration and properties of centres and crystals is analyzed. The character of the distortion of Cu(H2O) 2+6 complexes in “copper” crystals I and II is discussed in terms of cooperative JT effect. The main JT parameters of Cu(H2O) 2+6 complexes for the crystals under consideration are estimated.
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