The majority of spin-crossover (SCO) complexes studied to date are d6 Fe(II) complexes with nitrogen-coordinated ligands arranged octahedrally. Of these, FeII(phen)2(NCS)2 (phen = 1,10-phenanthroline), which transforms suddenly from a low-spin (1A1) to a high-spin state (5T2) as the temperature is raised above 175 K, is by far the most thoroughly investigated. Recently there has been interest in the SCO phenomenon as it occurs in the thin film regime. In order to develop a model system based on this well known complex, we have produced and characterized thin films produced by vapor deposition. It is shown through analysis of the IR, Raman, UV/Vis, and x-ray photoelectron spectroscopy that initially films of the tris complex [FeII(phen)3](SCN)2 result but can be annealed to yield the desired material. In the films produced by this manner, Fe(phen)2(NCS)2 experiences a broadened transition temperature (~20 K) near 180 K as shown by SQUID magnetometry.

Spectroscopic characterization of vapor deposited thin films from the spin-crossover complex FeII(phen)2(NCS)2 (phen = 1,10-phenanthroline)

245th National Meeting (2013)

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