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

Title data

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. Vol. 30 (2018) Issue 30 . - No. 305503.
ISSN 1361-648X
DOI: https://doi.org/10.1088/1361-648X/aacd7e

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: spin crossover; zwitterion; XAS; SOXIESST
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen > Lehrstuhl Experimentalphysik XI - Funktionelle Nanostrukturen - Univ.-Prof. Dr. Axel Enders
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Oct 2019 06:37
Last Modified: 11 Oct 2019 06:37
URI: https://eref.uni-bayreuth.de/id/eprint/52718