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Synthesis and photochemical and magnetic properties of Cr, Mn, Fe, and Co complexes based on the 1-{(1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indolin]-8-yl)methyl}pyridinium cation

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Abstract

Paramagnetic (tris)oxalates with the composition (SP)3M(C2O4)3·4H2O (M = Cr (2), Mn (3), Fe (4), and Co (5)) were synthesized for the first time based on the spiropyran salt SP+Br− (1) with the SP+ cation containing the pyridine ring in the aliphatic chain of the benzopyran moiety, which was also prepared in the present study. According to X-ray diffraction data, the SP+ cations in the starting salt 1 are close-packed thus hindering photochromic transformations. The spin for paramagnet 4 is 5/2, which corresponds to the FeIII atom in the high-spin state, the spin of the system remaining unchanged under UV irradiation. In complex 3, a crossover from ferromagnetic to antiferromagnetic correlations was observed after the replacement of the inorganic cation with the organic spiropyran cation.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432, Chernogolovka, Moscow Region, Russian Federation

    N. A. Sanina, S. M. Aldoshin, G. V. Shilov, E. V. Kurganova, E. A. Yurieva, V. A. Nadtochenko & R. B. Morgunov

  2. Southern Scientific Center, Russian Academy of Sciences, 41 prosp. Chekhova, 344006, Rostov-on-Don, Russian Federation

    N. A. Voloshin

  3. Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 prosp. Stachki, 344090, Rostov-on-Don, Russian Federation

    V. I. Minkin

Authors
  1. N. A. Sanina
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  2. S. M. Aldoshin
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  3. G. V. Shilov
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  4. E. V. Kurganova
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  5. E. A. Yurieva
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  6. N. A. Voloshin
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  7. V. I. Minkin
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  8. V. A. Nadtochenko
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  9. R. B. Morgunov
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Corresponding author

Correspondence to N. A. Sanina.

Additional information

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1424–1432, July, 2008.

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Sanina, N.A., Aldoshin, S.M., Shilov, G.V. et al. Synthesis and photochemical and magnetic properties of Cr, Mn, Fe, and Co complexes based on the 1-{(1′,3′,3′-trimethylspiro[2H-1-benzopyran-2,2′-indolin]-8-yl)methyl}pyridinium cation. Russ Chem Bull 57, 1451–1460 (2008). https://doi.org/10.1007/s11172-008-0188-3

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  • DOI: https://doi.org/10.1007/s11172-008-0188-3

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