Optical characterization of isothermal spin state switching in an Fe(II) spin crossover molecular and polymer ferroelectric bilayer

Authors

• Saeed Yazdani, Indiana University Purdue University Indianapolis
• Kourtney Collier, Purdue School of Engineering and Technology
• Grace Yang, Indiana University Purdue University Indianapolis
• Jared Phillips, Indiana University Purdue University Indianapolis
• Ashley Dale, Indiana University Purdue University Indianapolis
• Aaron Mosey, Indiana University Purdue University Indianapolis
• Samuel Grocki, Purdue University
• Jian Zhang, Lawrence Berkeley National Laboratory
• Anne E. Shanahan, Indiana University Purdue University Indianapolis
• Ruihua Cheng, Indiana University Purdue University Indianapolis
• Peter A. Dowben, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

6-8-2023

Citation

J. Phys.: Condens. Matter 35 (2023) 365401 (8pp) https://doi.org/10.1088/1361-648X/acd7ba

Comments

Used by permission.

Abstract

Using optical characterization, it is evident that the spin state of the spin crossover molecular complex [Fe{H₂B(pz)₂}₂(bipy)] (pz = tris(pyrazol-1-1y)-borohydride, bipy = 2,2′-bipyridine) depends on the electric polarization of the adjacent polymer ferroelectric polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) thin film. The role of the PVDF-HFP thin film is significant but complex. The UV–Vis spectroscopy measurements reveals that room temperature switching of the electronic structure of [Fe{H₂B(pz)₂}₂(bipy)] molecules in bilayers of PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] occurs as a function of ferroelectric polarization. The retention of voltage-controlled nonvolatile changes to the electronic structure in bilayers of PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] strongly depends on the thickness of the PVDF-HFP layer. The PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] interface may affect PVDF-HFP ferroelectric polarization retention in the thin film limit.