Surface induces different crystal structures in a room temperature switchable spin crossover compound
Articolo
Data di Pubblicazione:
2016
Citazione:
Surface induces different crystal structures in a room temperature switchable spin crossover compound / D. Gentili, F. Liscio, N. Demitri, B. Schäfer, F. Borgatti, P. Torelli, B. Gobaut, G. Panaccione, G. Rossi, A. Degli Esposti, M. Gazzano, S. Milita, I. Bergenti, G. Ruani, I. Salitros, M. Ruben, M. Cavallini. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - 45:1(2016 Jan), pp. 134-143. [10.1039/c5dt03712c]
Abstract:
We investigated the influence of surfaces in the formation of different crystal structures of a spin crossover
compound, namely [Fe(L)2] (LH: (2-(pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine), which is a neutral com-
pound thermally switchable around room temperature. We observed that the surface induces the for-
mation of two different crystal structures, which exhibit opposite spin transitions,
i.e. on heating them up to the transition temperature, one polymorph switches from high spin to low spin and the second poly-
morph switches irreversibly from low spin to high spin. We attributed this inversion to the presence of
water molecules H-bonded to the complex tetrazolyl moieties in the crystals. Thin deposits were investi-
gated by means of polarized optical microscopy, atomic force microscopy, X-ray diffraction, X-ray
absorption spectroscopy and micro Raman spectroscopy; moreover the analysis of the Raman spectra
and the interpretation of spin inversion were supported by DFT calculations.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
spin crossover compound; surface; XAS
Elenco autori:
D. Gentili, F. Liscio, N. Demitri, B. Schäfer, F. Borgatti, P. Torelli, B. Gobaut, G. Panaccione, G. Rossi, A. Degli Esposti, M. Gazzano, S. Milita, I. Bergenti, G. Ruani, I. Salitros, M. Ruben, M. Cavallini
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