Pulsed-laser switching in the bistability domain of a cooperative spin crossover compound: A critical study through calorimetry

Castro, M. (Universidad de Zaragoza) ; Roubeau, O. (Universidad de Zaragoza) ; Piñeiro-López, L. ; Real, J. A. ; Rodríguez-Velamazán, J. A.

Resumen: The photoswitching from the low spin (LS) to high spin (HS) state and the reverse process in the bistability domain of spin crossover (SCO) compounds is a promising function to be used in molecular electronic devices, and evidenced mainly through spectroscopy. The phenomenon, and in particular its mechanism, is however still under debate since some controversial experimental results have been reported. Here we present a calorimetric experimental study of the photoswitching of the [Fe(pyrazine)Pt(CN)4] SCO material by a nanosecond-pulsed green laser. Our results confirm that the single laser pulse of varying energies results in significant LS to HS transformations and show that calorimetry provides an accurate quantification of the overall conversion. Successive pulses allow increasing the conversion, achieving a maximum of 60% under our experimental conditions. The HS to LS transformation is on the other hand not induced at any laser fluences contrary to previous reports. The results are compared with those reported with Raman spectroscopy and critically discussed in terms of efficiency of the transformation and potential thermal effects.

Idioma: Inglés

DOI: 10.1021/acs.jpcc.5b05864

Año: 2015

Publicado en: Journal of Physical Chemistry C 119, 30 (2015), 17334-17343
ISSN: 1932-7447

Factor impacto JCR: 4.509 (2015)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 30 / 144 = 0.208 (2015) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 39 / 271 = 0.144 (2015) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 22 / 83 = 0.265 (2015) - Q2 - T1

Factor impacto SCIMAGO: 1.886 - Electronic, Optical and Magnetic Materials (Q1) - Energy (miscellaneous) (Q1) - Surfaces, Coatings and Films (Q1) - Physical and Theoretical Chemistry (Q1) - Nanoscience and Nanotechnology (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E100
Financiación: info:eu-repo/grantAgreement/ES/DGA/E98-MOLCHIP
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2011-24284
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2011-27233-C02-02
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CSD2007-00010
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2011-23862-C02-01
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2013-46275-P

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)