Abstract
An increase in the effective magnetic moments and linewidths in ESR spectra caused by the presence of crystallization water molecules in crystals of tris(oxalato)chromium(III) complexes with spiropyran cations Sp+ was found. Dehydration (rehydration) of crystals causes a reversible decrease (increase) in thermally induced paramagnetism of Sp+. Thermally induced paramagnetism of crystals appears in the compounds synthesized in oxygen atmosphere but is not found in the compounds synthesized under argon atmosphere. The contributions of chromium oxalates and thermally excited spiropyran molecules to the magnetization were separated using ESR spectroscopy. The enthalpies of the biradical states of some types of spiropyran cations in crystals were determined.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1365–1371, July, 2011.
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Mushenok, F.B., Morgunov, R.B., Sanina, N.A. et al. Thermally induced paramagnetism of spiropyran salts. Russ Chem Bull 60, 1387–1393 (2011). https://doi.org/10.1007/s11172-011-0208-6
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DOI: https://doi.org/10.1007/s11172-011-0208-6