Spin Crossover of a Langmuir−Blodgett Film Based on an Amphiphilic Iron(II) Complex

• Published in: Langmuir Vol. 14; no. 20; pp. 5890 - 5895
• Main Authors: Soyer, H, Mingotaud, C, Boillot, M.-L, Delhaes, P
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 29-09-1998
• Subjects: Chemistry; Exact sciences and technology; General and physical chemistry; Langmuir blodgett films; Surface physical chemistry; Monolayer; Iron Complexes; Electronic properties; Chemical stability; Organic ligand; Temperature effect; Spin conversion; Transition metal Complexes; Air water interface; Experimental study; Infrared spectrometry; Isothiocyanato complex; Langmuir Blodgett layer
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la9803934

An amphiphilic iron(II) complex [FeIIL2(NCS)2, where L is a substituted bipyridine] exhibiting a thermal spin-crossover phenomenon around room temperature is chemically unstable at the gas−water interface. However, it forms a perfectly stable Langmuir film when formamide−water mixtures are used as a subphase. After transfer onto a solid substrate, a well-defined Langmuir−Blodgett (LB) film was then obtained. Infrared spectroscopy at variable temperature showed that the spin conversion still occurs in this lamellar material. The specific organization imposed by the LB technique leads to a surroundings effect demonstrated, in particular, by thermal cycles. The understanding of this effect is crucial to control any thermal or light-induced spin conversion within an LB film.