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

doi:10.1088/1361-648X/aacd7e

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 journal › Article › peer-review

3 Scopus citations

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 language	English (US)
Article number	305503
Journal	Journal of Physics Condensed Matter
Volume	30
Issue number	30
DOIs	https://doi.org/10.1088/1361-648X/aacd7e
State	Published - Jul 5 2018

Keywords

SOXIESST
XAS
spin crossover
zwitterions

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1088/1361-648X/aacd7e

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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 journal › Article › peer-review

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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.",

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