Electronic Structure of a Spin Crossover Molecular Adsorbate

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• 作者：Xin Zhang ; Tatiana Palamarciuc ; Patrick Rosa ; Jean-Fran莽ois L茅tard ; Bernard Doudin ; ZhengZheng Zhang ; Jian Wang ; Peter A. Dowben
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：November 8, 2012
• 年：2012
• 卷：116
• 期：44
• 页码：23291-23296
• 全文大小：285K
• 年卷期：v.116,no.44(November 8, 2012)
• ISSN：1932-7455

文摘

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鈥?bipyridine) by ultraviolet photoelectron spectroscopy (UPS), inverse photoemission (IPES), and X-ray absorption spectroscopy (XAS). A bandgap of 2鈥? 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鈥揟rFE).