Effect of polar molecules in spin crossover transition of Fe(H<sub>2</sub>B(pz)<sub>2</sub>)<sub>2</sub>(bipy)

ORAL

Abstract

The spin crossover phenomenona is a temperature-induced transition of diamagnetic low spin (LS) state to paramagnetic high spin (HS) state. This transition can also be triggered by pressure, light or magnetic field. The Fe(II) spin crossover molecules are known to exhibit spin-crossover transition and we have shown that [Fe{H2B(pz)2}2(bipy)] exhibits a temperature dependent spin-crossover transition from its LS state to the HS state, if the temperature is increased above approximately 160 K. The temperature dependence of the spin state occupancy Fe(II) complex can be affected by addition of polar molecules. The highly polar p-benzoquinonemonoimine zwitterion mixed with [Fe{H2B(pz)2}2(bipy)] resulted in locking [Fe{H2B(pz)2}2(bipy)] largely into a low spin state while addition of the di-ethyl derivative of p-benzoquinonemonoimine zwitterion mixed with [Fe{H2B(pz)2}2(bipy)] did not appear to perturb the spin crossover transition. Addition of different polar molecule, benzimidazole with small dipole moment results in a re-entrant spin crossover transition.

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Presenters

  • Thilini Ekanayaka

    • University of Nebraska - Lincoln
    • Physics and Astronomy, University of Nebraska at Lincoln

Authors

  • Thilini Ekanayaka

    • University of Nebraska - Lincoln
    • Physics and Astronomy, University of Nebraska at Lincoln

  • Paulo S Costa

    • University of Nebraska - Lincoln

  • Guanhua Hao

    • University of Nebraska - Lincoln
    • Department of Physics and Astronomy, University of Nebraska - Lincoln
    • Department of Physics and Astronomy, University of Nebraska

  • Alpha T. N'Diaye

    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Adv Light Source LBL

  • Lucie Routaboul

    • Université Paul Sabatier

  • Pierre Braunstein

    • Université de Strasbourg

  • Xin Zhang

    • University of Nebraska - Lincoln
    • Department of Chemistry, University of Nebraska–Lincoln

  • Jian Zhang

    • University of Nebraska - Lincoln
    • Department of Chemistry, University of Nebraska–Lincoln

  • Qin-Yin Shi

    • University of Nebraska - Lincoln

  • Vicki Schlegel

    • University of Nebraska - Lincoln

  • Bernard Doudin

    • Université de Strasbourg

  • Axel Enders

    • Universität Bayreuth

  • Peter A Dowben

    • University of Nebraska - Lincoln
    • Department of Physics and Astronomy, University of Nebraska - Lincoln
    • Department of Physics and Astronomy, University of Nebraska
    • Physics and Astronomy, University of Nebraska - Lincoln