Cooperative Spin Transition in a Mononuclear Manganese(III) Complex


  • We thank Prof. Maria José Calhorda, Universidade de Lisboa, and Prof. Luis Vieros, Universidade Técnica de Lisboa, for DFT calculations and Dr. Charles Harding, Open University (UK), for calculation of g values. Funding from the Irish Research Council for Science, Engineering and Technology (IRCSET), FNRS (FRFC 2.4508.08, 2.4537.12, IISN 4.4507.10), Fundação para a Ciência e a Technologia, Enterprise Ireland, and the ERA-Chemistry programme is gratefully acknowledged. Significant funding for a SQUID magnetometer by the Irish Higher Education Authority is also gratefully acknowledged, as is generous support from University College Dublin (to G.G.M. and B.G.). T.E.K. and T.L. acknowledge the Irish Government’s Programme for Research in Third Level Institutions, Cycle 4, Ireland’s EU Structural Funds Programmes 2007–2013 and Career Enhancement and Mobility Fellowship co-funded by Marie Curie Actions.


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Mind the gap: A complete, cooperative spin transition for a mononuclear MnIII complex is reported with an 8 K hysteresis window. Raman spectra collected at a single temperature in warming and cooling modes confirm the electronic bistability within the hysteresis loop. The source of the cooperativity is a disconnection in the hydrogen-bonded 1D chains that connect adjacent cations owing to an order–disorder transition in the PF6 counterion.