Organized Molecular Assemblies based on Ferrocenyl Derivatives
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Organized Molecular Assemblies based on Ferrocenyl Derivatives Rosa E. Lazo-Jiménez1, José G. López- Cortés2, José A. Chávez-Carvayar3, Jordi Ignés-Mullol4, Francesc Sagués 4, María C. Ortega-Alfaro1, María Pilar Carreón-Castro1 1
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, C.P. 04510, Ciudad Universitaria. D.F., México. 2 Instituto de Química, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, C.P. 04510, Ciudad Universitaria. D.F., México. 3 Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, C.P. 04510, Ciudad Universitaria. D.F., México. 4 Department of Chemistry-Physics, IN2UB, University of Barcelona, Spain. ABSTRACT Organic films with a thickness of few nanometers are potentially useful components in many practical and commercial applications such as sensors, detectors, displays and electronic circuit components. In this context, the Langmuir-Blodgett (LB) method is one the most promising techniques for preparing these films. In this work, we report the synthesis and characterization of three new amphiphilic organometallic compounds with ferrocene units, which consist of one ferrocenyl aminocarbene with the general formula FcC=Cr(CO)5NH(CH2)15CH3, and two ferrocenyl amides with the general formula FcC=MNH(CH2)15CH3 where M = S or Se. These new derivatives have been synthesized to study the influence of long alkyl side chain and the hydrophilic head on the film organization behavior at the air-water interface. The Langmuir-Blodgett (LB) technique was focused for building ordered nanostructures in molecular assemblies of ferrocenyl derivatives, which are apt to form a stable and transferable monolayer film. The π-A isotherm, hysteresis, Brewster angle microscopy (BAM) and film stability were used to characterize the behavior of a monolayer film at the air-water interface. Ztype LB films were prepared from molecular monolayers which were transferred onto glass substrates. These films were characterized by atomic force microscopy (AFM), UV-Visible spectra and X-ray diffraction (DRX) techniques.
INTRODUCTION Nowadays, molecular electronics is a new, exciting and interdisciplinary field of research to create, design and synthesize new molecules -or modify them- to obtain thin films, based on organic and organometallic materials, for electronic and optoelectronic devices. On the other hand, the Langmuir-Blodgett (LB) technique is an interesting alternative for the formation of new nanomaterials like ultra-thin films. Also, it is one of the few methods for preparing organized molecular assemblies [1], which are the starting point for molecular electronic devices. In this method, a single layer of molecules is organized on a liquid surface, usually water, and then transferred onto a solid support to form a thin film with the thickness of the constituent molecule. If this process is repeated, multilayered films can be prepared. If the 23
layer of molecules is formed at the air-water int
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