Perturbing the spin crossover transition activation energies in Fe(H2B(pz)2)2(bipy) with zwitterionic additions

Paulo Costa, Guanhua Hao, Alpha T. N'Diaye, Lucie Routaboul, Pierre Braunstein, Xin Zhang, Jian Zhang, Bernard Doudin, Axel Enders, Peter A. Dowben

Research output: Contribution to journalArticle

Abstract

A thermal component to the soft x-ray induced spin crossover transition exists in the switching of a spin crossover compound (complex [Fe{H2B(pz)2}2(bipy)] (pz = pyrazol-1-yl, bipy = 2,2′-bipyridine) combined with the dipolar molecular additives (zwitterionic p-benzoquinonemonoimine C6H2()2()2). The addition of the zwitterionic molecule locks the Fe(II) complex in a largely low spin state configuration over an unusually broad temperature range that includes temperatures well above the thermal spin crossover temperature of 160 K. It is demonstrated here that the process of exciting the [Fe{H2B(pz)2}2(bipy)] moiety, in the presence of with C6H2()2()2, to an electronic state characteristic of the high spin state though incident x-ray fluences, has a thermal activation energies are determined to 14-18 meV for a range of mixing ratios from 1:2 to 1:10. Those activation energies are also significantly reduced as compared to values of 60-80 meV found for nanometer thin films of [Fe{H2B(pz)2}2(bipy)] on SiO2.

Original languageEnglish (US)
Article number305503
JournalJournal of Physics Condensed Matter
Volume30
Issue number30
DOIs
StatePublished - Jul 5 2018

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crossovers
Activation energy
activation energy
X rays
Electronic states
Temperature
complex compounds
Thin films
mixing ratios
Molecules
temperature
fluence
x rays
Hot Temperature
thin films
configurations
electronics
molecules

Keywords

  • SOXIESST
  • XAS
  • spin crossover
  • zwitterions

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Costa, P., Hao, G., N'Diaye, A. T., Routaboul, L., Braunstein, P., Zhang, X., ... Dowben, P. A. (2018). Perturbing the spin crossover transition activation energies in Fe(H2B(pz)2)2(bipy) with zwitterionic additions. Journal of Physics Condensed Matter, 30(30), [305503]. https://doi.org/10.1088/1361-648X/aacd7e

Perturbing the spin crossover transition activation energies in Fe(H2B(pz)2)2(bipy) with zwitterionic additions. / Costa, Paulo; Hao, Guanhua; N'Diaye, Alpha T.; Routaboul, Lucie; Braunstein, Pierre; Zhang, Xin; Zhang, Jian; Doudin, Bernard; Enders, Axel; Dowben, Peter A.

In: Journal of Physics Condensed Matter, Vol. 30, No. 30, 305503, 05.07.2018.

Research output: Contribution to journalArticle

Costa, P, Hao, G, N'Diaye, AT, Routaboul, L, Braunstein, P, Zhang, X, Zhang, J, Doudin, B, Enders, A & Dowben, PA 2018, 'Perturbing the spin crossover transition activation energies in Fe(H2B(pz)2)2(bipy) with zwitterionic additions', Journal of Physics Condensed Matter, vol. 30, no. 30, 305503. https://doi.org/10.1088/1361-648X/aacd7e
Costa, Paulo ; Hao, Guanhua ; N'Diaye, Alpha T. ; Routaboul, Lucie ; Braunstein, Pierre ; Zhang, Xin ; Zhang, Jian ; Doudin, Bernard ; Enders, Axel ; Dowben, Peter A. / Perturbing the spin crossover transition activation energies in Fe(H2B(pz)2)2(bipy) with zwitterionic additions. In: Journal of Physics Condensed Matter. 2018 ; Vol. 30, No. 30.
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