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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