Evidence for Surface Effects on the Intermolecular Interactions in Fe (II) Spin Crossover Coordination Polymers

Authors

Thilini K. Ekanayaka, University of Nebraska - Lincoln
Hannah Kurz, University of Bayreuth
Kayleigh A. McElveen, University of Nebraska - LincolnFollow
Guanhua Hao, University of Nebraska-Lincoln, Lawrence Berkeley National Laboratory
Esha Mishra, University of Nebraska-Lincoln
Alpha T. N’Diaye, Lawrence Berkeley National Laboratory
Rebecca Lai, University of Nebraska - LincolnFollow
Birgit Weber, University of Bayreuth
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

12-2-2021

Citation

Physical Chemistry Chemical Physics. PCCP 24:2 (2022). doi:10.1039/D1CP04243B

Comments

Used by permission.

Abstract

From X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS) it is evident that the spin state transition behavior of Fe(II) spin crossover coordination polymer crystallites at the surface differs from the bulk. A comparison of four different coordination polymers reveals that the observed surface properties may differ from bulk for a variety of reasons. There are Fe(II) spin crossover coordination polymers with either almost complete switching of the spin state at the surface or no switching at all. Oxidation, differences in surface packing, and changes in coordination could all contribute to making the surface very different from the bulk. Some Fe(II) spin crossover coordination polymers may be sufficiently photoactive so that X-ray spectroscopies cannot discern the spin state transition.