| Autor: |
Costa PS; Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, United States of America., Hao G, N'Diaye AT, Routaboul L, Braunstein P, Zhang X, Zhang J, Ekanayaka TK, Shi QY, Schlegel V, Doudin B, Enders A, Dowben PA |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2020 Jan 16; Vol. 32 (3), pp. 034001. Date of Electronic Publication: 2019 Oct 22. |
| DOI: |
10.1088/1361-648X/ab468c |
| Abstrakt: |
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{H 2 B(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 C 6 H 2 (…NH 2 ) 2 (…O) 2 was mixed with [Fe{H 2 B(pz) 2 } 2 (bipy)], which resulted in locking [Fe{H 2 B(pz) 2 } 2 (bipy)] largely into a low spin state while addition of the ethyl derivative C 6 H 2 (…NHC 2 H 5 ) 2 (…O) 2 did not appear to perturb the spin crossover transition of [Fe{H 2 B(pz) 2 } 2 (bipy)]. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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