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A phase transition in which the conductivity drops by a factor of 106–108 within 2–3 K is triggered by the replacement of R1,R3 = CH3 in the radical anion salts 1 by R1 = CH3, R3 = CD3 and R1,R3 = CD3. This extreme change is in sharp contrast with the known minimal variations caused by secondary deuterium isotope effects.
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Hünig et al. (1992) studied this question.
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