Progress of Multi Functional Properties of Organic-Inorganic Hybrid System, AFeIIFeIIIX3 A = n-CnH2n 14N, Spiropyran; X = C2O2S2, C2OS3, C2O3SReportar como inadecuado


Progress of Multi Functional Properties of Organic-Inorganic Hybrid System, AFeIIFeIIIX3 A = n-CnH2n 14N, Spiropyran; X = C2O2S2, C2OS3, C2O3S


Progress of Multi Functional Properties of Organic-Inorganic Hybrid System, AFeIIFeIIIX3 A = n-CnH2n 14N, Spiropyran; X = C2O2S2, C2OS3, C2O3S - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Graduate school of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan





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Abstract In the case of mixed-valence systems whose spin states are situated in the spin crossover region, new types of conjugated phenomena coupled with spin and charge are expected. From this viewpoint, we have investigated the multifunctional properties coupled with spin, charge and photon for the organic-inorganic hybrid system, AFeIIFeIIIX3A = n-CnH2n+14N, spiropyran; X = dtoC2O2S2, ttoC2OS3, mtoC2O3S. AFeIIFeIIIdto3 and AFeIIFeIIItto3 undergo the ferromagnetic phase transitions, while AFeIIFeIIImto3 undergoes a ferrimagnetic transition. In n-CnH2n+14N FeIIFeIIIdto3n = 3,4, a new type of phase transition called charge transfer phase transition CTPT takes place around 120 K, where the thermally induced charge transfer between FeII and FeIII occurs reversibly. At the CTPT, the iron valence state dynamically fluctuated with a frequency of about 0.1 MHz, which was confirmed by means of muon spin relaxation. The charge transfer phase transition and the ferromagnetic transition for n-CnH2n+14NFeIIFeIIIdto3 remarkably depend on the size of intercalated cation. In the case of SPFeIIFeIIIdto3SP = spiropyran, the photoinduced isomerization of SP under UV irradiation induces the charge transfer phase transition in the FeIIFeIIIdto3 layer and the remarkable change of the ferromagnetic transition temperature. In the case of n-CnH2n+14NFeIIFeIIImto3mto = C2O3S, a rapid spin equilibrium between the high-spin state S = 5-2 and the low-spin state S = 1-2 at the FeIIIO3S3 site takes place in a wide temperature range, which induces the valence fluctuation of the FeS3O3 and FeO6 sites through the ferromagnetic coupling between the low spin state S = 1-2 of the FeIIIS3O3 site and the high spin state S = 2 of the FeIIO6 site. View Full-Text

Keywords: concerted phenomenon; charge transfer phase transition; mixed valence; ferromagnetism; photo-isomerization; photo-induced phase transition; valence fluctuation concerted phenomenon; charge transfer phase transition; mixed valence; ferromagnetism; photo-isomerization; photo-induced phase transition; valence fluctuation





Autor: Norimichi Kojima * , Masaya Enomoto, Noriyuki Kida and Koichi Kagesawa

Fuente: http://mdpi.com/



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