Hybrid Organic/Inorganic Langmuir-Blodgett Films. A Supramolecular Approach to Ultrathin Magnetic Films

Abstract

Thin organic films with interesting magnetic propertiessuch as the magnetic memory effect have been achieved using the Langmuir–Blodgett technique. Results are summarized in this report whereby polyoxometalate anions containing magnetically active transition metals have been incorporated as layers of discrete clusters (see Figure) between monolayers of behenic acid.

Electrodeposition of Inorganic/Organic Hybrid Thin Films

“…[31] The Langmuir-Blodgett technique has been employed to yield ultrathin films of hybrid materials. [32,33] There are also ways to obtain hybrid materials by introducing one of the components to another by post treatments. [34][35][36] Guest materials are loaded into pre-established porous host materials.…”

“…An especially beautiful example of such an approach is the ordered loading of functional molecules into straight channels of zeolites, as studied by Calzaferri and co-workers, which is nicely summarized in their review. [36] The purpose for synthesizing hybrid materials varies from enhanced bioactivities, [26][27][28] charge storage, [31] and magnetic properties, [33] to luminescence and nonlinear optical properties. [28,30,34] One of the most successful industrial applications of the special properties exhibited only by the combination of inorganic and organic materials is that of photography.…”

Electrochemical behavior of an inorganic–organic hybrid based on isopolymolybdate anions and ethylenediamine

“…Also, polyoxometalates possess superacid acidity, strong oxidizability, and exhibit fast reversible multiple electron redox transformations under rather mild conditions and high stability of most of their redox states [5][6][7] which make them very useful in the preparation of modified electrodes. The hybrid materials of POMs with organic or biochemical substances can combine both inorganic and organic qualities, possessing new synergistic properties and diverse applications in photo-and electro-chromism, magnetism, catalysis and medicine [8][9][10][11][12][13][14][15][16][17]. Therefore, the design of new kinds of hybrid materials containing both POMs and organic subunits and the development of their beneficial properties can be investigated for both fundamental and applied chemistry.…”

Diffusion inélastique des neutrons sur les aimants moléculaires

“…Ces bits quantiques magnétiques [31,65,75,112] sont l'étape ultime de la miniaturisation, cependant, l'environnement cristallin (interactions avec le monde extérieur), modifiant la stabilité et la dynamique de ces sytèmes (phénomènes de décohérence quantique), conduit à une perte de l'information portée par la molécule et constitue un obstacle majeur au développement de la spintronique moléculaire [94]. Un travail récent de "fonctionalisation" de ces matériaux moléculaires a été entrepris notamment sur des surfaces [34,70,100], ou par organisation en films de LangmuirBlodgett [45,46,102]. En parallèle les aimants moléculaires sont des systèmes modèles pour l'étude de certaines fonctions biologiques (transport d'oxygène [19,25,56,93], activité enzymatique [43,126,127]).…”