ZHANG, Xin; PALAMARCIUC, Tatiana; ROSA, Patrick; LÉTARD, Jean-François; DOUDIN, Bernard; WANG, Jian; DOWBEN, Peter A.

doi:10.1021/jp3034962

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ZHANG, Xin
Nebraska Center for Materials and Nanoscience

PALAMARCIUC, Tatiana
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ROSA, Patrick
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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The Journal of physical chemistry. 2012, vol. 116, n° 44, p. 23291-23296

American Chemical Society (ACS)

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We have investigated the occupied and unoccupied electronic structure of ultrahigh vacuum (UHV) evaporated molecular thin films of the spin crossover [Fe(H2B(pz)2)2(bipy)] complex (with H2B(pz)2 = bis(hydrido)bis(1H-pyrazol-1-yl)borate and bipy = 2,2′-bipyridine) by ultraviolet photoelectron spectroscopy (UPS), inverse photoemission (IPES), and X-ray absorption spectroscopy (XAS). A bandgap of 2-3 eV is deduced from combined UPS and IPES measurements of the molecular films on Au substrates. The matching Fe XAS and IPES spectra indicate that the electronic unoccupied states have a significant Fe weight. The shift of the unoccupied density of states seen in inverse photoemission is consistent with the thermally induced spin crossover transition for [Fe(H2B(pz)2)2(bipy)] deposited on the organic ferroelectric copolymer poly(vinylidene fluoride) with trifluoroethylene (PVDF-TrFE).< Leer menos

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Thin films

Electronic structure

Spin crossover

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Electronic structure of a spin crossover molecular adsorbate

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