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Characterization of spin crossover crystal surface by AFM

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Chong, Christian [] Berini, Bruno [] Boukheddaden, K. [] Codjovi, E. [] Linares, J. [] Garcia, Yann [UCL] Varret, F. []

Imaging nano-domains in spin crossover (SCO) compounds remains so far an unreached goal. We report on the first AFM tapping-mode investigation of SCO single crystals, performed at room temperature with the well known mononuclear compound [Fe(ptz)(6)](BF4)(2) (ptz = 1-propyl-tetrazole) and the trinuclear supramolecular compound [Fe-3(hyetrz)(6)(H2O)(6)](CF3SO3)(6) (hyetrz = 4-(2’-hydroxyethyl)-1,2,4-triazole) which shows a gradual spin conversion centred at room temperature. The natural surface of the former crystal revealed a volatile coating of the scanned area attributed to the transport of adsorbed water under the effect of interaction with the AFM tip. The second one showed astonishing leopard-skin patterns assigned to the effect of atmospheric humidity on this hygroscopic compound. Their origin is discussed. We suggest the use of fluid coating layers as a general method for revealing the nano-patterning of physical properties (e.g. like-spin domains) at the surface of dielectric materials. [GRAPHICS] AFM-tapping images of [Fe-3(hyetrz)(6)(H2O)(6)](CF3SO3)(6) room temperature and ambient atmosphere. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2010
Language Anglais
Journal information "Physica Status Solidi a" - Vol. 207, p. 1227-1231 (2010)
Peer reviewed yes
Publisher Wiley-VCH
issn 1862-6300
e-issn 1862-6319
Publication status Publié
Affiliation UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity
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Bibliographic reference Chong, Christian ; Berini, Bruno ; Boukheddaden, K. ; Codjovi, E. ; Linares, J. ; et. al. Characterization of spin crossover crystal surface by AFM. In: Physica Status Solidi a, Vol. 207, p. 1227-1231 (2010)
Permanent URL http://hdl.handle.net/2078.1/89494