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Locking and Unlocking the Molecular Spin Crossover Transition

Title data

Zhang, Xin ; Costa, Paulo S. ; Hooper, James ; Miller, Daniel P. ; N'Diaye, Alpha T. ; Beniwal, Sumit ; Jiang, Xuanyuan ; Yin, Yuewei ; Rosa, Patrick ; Routaboul, Lucie ; Gonidec, Mathieu ; Poggini, Lorenzo ; Braunstein, Pierre ; Doudin, Bernard ; Xu, Xiaoshan ; Enders, Axel ; Zurek, Eva ; Dowben, Peter A.:
Locking and Unlocking the Molecular Spin Crossover Transition.
In: Advanced Materials. Vol. 29 (2017) Issue 39 . - No. 1702257.
ISSN 1521-4095
DOI: https://doi.org/10.1002/adma.201702257

Abstract in another language

The Fe(II) spin crossover complex [Fe{H2B(pz)2}2(bipy)] (pz = pyrazol‐1‐yl, bipy = 2,2′‐bipyridine) can be locked in a largely low‐spin‐state configuration over a temperature range that includes temperatures well above the thermal spin crossover temperature of 160 K. This locking of the spin state is achieved for nanometer thin films of this complex in two distinct ways: through substrate interactions with dielectric substrates such as SiO2 and Al2O3, or in powder samples by mixing with the strongly dipolar zwitterionic p‐benzoquinonemonoimine C6H2(—⋯ NH2)2(—⋯ O)2. Remarkably, it is found in both cases that incident X‐ray fluences then restore the [Fe{H2B(pz)2}2(bipy)] moiety to an electronic state characteristic of the high spin state at temperatures of 200 K to above room temperature; that is, well above the spin crossover transition temperature for the pristine powder, and well above the temperatures characteristic of light‐ or X‐ray‐induced excited‐spin‐state trapping. Heating slightly above room temperature allows the initial locked state to be restored. These findings, supported by theory, show how the spin crossover transition can be manipulated reversibly around room temperature by appropriate design of the electrostatic and chemical environment.

Further data

Item Type: Article in a journal
Refereed: Yes
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 06:06
Last Modified: 11 Oct 2019 06:06
URI: https://eref.uni-bayreuth.de/id/eprint/52725