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Manipulation of the molecular spin crossover transition of Fe(H₂B(pz)₂)₂(bipy) by addition of polar molecules

Title data

Costa, Paulo S ; Hao, Guanhua ; N’Diaye, Alpha T ; Routaboul, Lucie ; Braunstein, Pierre ; Zhang, Xin ; Zhang, Jian ; Ekanayaka, Thilini K ; Shi, Qin-Yin ; Schlegel, Vicki ; Doudin, Bernard ; Enders, Axel ; Dowben, P A:
Manipulation of the molecular spin crossover transition of Fe(H₂B(pz)₂)₂(bipy) by addition of polar molecules.
In: Journal of Physics: Condensed Matter. Vol. 32 (22 October 2019) Issue 3 . - No. 034001.
ISSN 1361-648X
DOI: https://doi.org/10.1088/1361-648X/ab468c

Abstract in another language

The addition of various dipolar molecules is shown to affect the temperature dependence of the spin state occupancy of the much studied spin crossover Fe(II) complex, [Fe{H2B(pz)2}2(bipy)] (pz  =  pyrazol-1-yl, bipy  =  2,2'-bipyridine). Specifically, the addition of benzimidazole results in a re-entrant spin crossover transition, i.e. the spin state starts in the mostly low spin state, then high spin state occupancy increases, and finally the high spin state occupancy decreases with increasing temperature. This behavior contrasts with that observed when the highly polar p -benzoquinonemonoimine zwitterion C6H2(...NH2)2(...O)2 was mixed with [Fe{H2B(pz)2}2(bipy)], which resulted in locking [Fe{H2B(pz)2}2(bipy)] largely into a low spin state while addition of the ethyl derivative C6H2(...NHC2H5)2(...O)2 did not appear to perturb the spin crossover transition of [Fe{H2B(pz)2}2(bipy)].

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Spin crossover metal organic molecules; x-ray absorption spectroscopy; dipolar heteromolecular molecular interactions; re-entrant transition.
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics XI - Functional Nanostructures
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics XI - Functional Nanostructures > Chair Experimental Physics XI - Functional Nanostructures - Univ.-Prof. Dr. Axel Enders
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 28 Oct 2019 06:32
Last Modified: 28 Oct 2019 06:32
URI: https://eref.uni-bayreuth.de/id/eprint/52861