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A molecule-based magnet of formula (SP)MnCr(ox) 3 ·H 2 O has been synthesized, where SP + stands for a new N -methylated pyridospiropyran cation and ox 2- represents the oxalate anion. The compound orders ferromagnetically at 5.5 K and exhibits crystalline-state photochromism. The main spectrokinetic data of the UV-induced open form of SP + are strongly modified in (SP)MnCr(ox) 3 ·H 2 O as compared to those found in (SP)I. The reversible photoreaction of SP + does not modulate the critical temperature of the long-range ferromagnetic order in (SP)MnCr(ox) 3 ·H 2 O but modifies in a significant way its hysteresis loop.
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Bénard et al. (2000) studied this question.
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