Manipulation of the molecular spin crossover transition of Fe(H2B(pz)2)2(bipy) by addition of polar molecules
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Strasbourg (France); Univ. Paul Sabatier, Toulouse (France)
- Univ. of Strasbourg (France)
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Chemistry
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Food Science and Technology
- Univ. de Strasbourg (France)
- Univ. Bayreuth (Germany). Physikalisches Inst.
In this paper, 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 ρ-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)].
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Agence Nationale de la Recherche
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1635179
- Alternate ID(s):
- OSTI ID: 23015729
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 3 Vol. 32; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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