Coordination dependence of cooperative effects in spin crossover [Fe{H2B(pz)2}2(bipy)] thin film

ORAL

Abstract

The electronic state of Fe(II) spin crossover complex [Fe{H2B(pz)2}2(bipy)] (pz = pyrazol-1-yl, bipy = 2,2′-bipyridine) thin film on Al2O3 has been investigated by magnetometry (SQUID) and X-ray absorption spectroscopy (XAS) in both the total electronic yield mode and the photo-luminescence yield mode. The transition temperature of the spin crossover transition has a 20 K difference between the cooling and heating sequence in magnetometry and X-ray absorption spectroscopy taken in both the total electronic yield and photo-luminescence yield modes, indicating cooperative effects in the Fe(II) spin crossover complex. The differences in the hysteresis loop for the spin crossover transition for this Fe(II) spin crossover complex at the surface of the molecular film, extracted from X-ray absorption taken in the total electronic yield mode, differs from the bulk, as obtained from magnetometry and photo-luminescence yield mode X-ray absorption. This indicates the intermolecular interactions between the spin crossover molecules, at the surface of the Fe(II) spin crossover complex thin film, differs from bulk.

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Presenters

  • Guanhua Hao

    Department of Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299, Physics, University of Nebraska - Lincoln, Physics and Astronomy, The University of Nebraska-Lincoln

Authors

  • Guanhua Hao

    Department of Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299, Physics, University of Nebraska - Lincoln, Physics and Astronomy, The University of Nebraska-Lincoln

  • Xuanyuan Jiang

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

  • Aaron Mosey

    Physics Department, Indiana University Purdue University-Indianapolis

  • Andrew J Yost

    Department of Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299, Physics, University of Nebraska - Lincoln, Physics and Astronomy, The University of Nebraska-Lincoln

  • Xin Zhang

    Department of Chemistry, University of Nebraska-Lincoln

  • Alpha N'Diaye

    Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Advanced Light Source, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA

  • Jian Zhang

    Department of Chemistry, University of Nebraska-Lincoln

  • Ruihua Cheng

    Physics Department, Indiana University Purdue University-Indianapolis

  • Xiaoshan Xu

    Department of Physics and Astronomy, University of Nebraska-Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, University of Nebraska, Department of Physics and Astronomy, Physics, University of Nebraska Lincoln

  • Peter A Dowben

    Department of Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299, Physics and Astronomy, University of Nebraska-Lincoln, Physics, University of Nebraska - Lincoln, Physics and Astronomy, The University of Nebraska-Lincoln