Abstract
It has been shown by thermodynamic and electro-chemical methods that coordination interactions are involved in the process of incorporation of rare-earth elements and/or Fe into Langmuir monolayers of oligomer with alkyl fragment. A coordination mechanism, which is responsible for self-organization of octahedral Fe(II)-complexes of nano-cyclic ligands obtained from oligomer of thiophene pyrrole series derivatives in compressed Langmuir monolayers has been proposed. It has been established that a coordinational-polymeric hexagonal network of nano-cyclic ligands with metal centers is formed at the phase transition when compressing the Langmuir monolayers of thiophene pyrrole series oligomer with alkyl fragment on surface of subphase with rare-earth (Sm, Er, Ce) and/or Fe ions.
Highlights
Metal-polymer Langmuir-Blodgett (LB) films with rareearth and transition elements as quantum spin-polarized conducting molecular layers are of great interest for opto- and nano-electronics as well as for sensor technology
The monolayers are formed from ions of amphiphilic molecules and counter ions of the subphase by phase transition from two-dimensional gas to a crystalline state [5]
The LB technique is difficult to utilize because it is necessary to optimize the ratio of mutually exclusive properties of semiconductor hydrophilic and insulator lipophilic sublayers in the amphiphilic monolayer
Summary
Metal-polymer Langmuir-Blodgett (LB) films with rareearth and transition elements as quantum spin-polarized conducting molecular layers (monolayers) are of great interest for opto- and nano-electronics as well as for sensor technology. In this paper we show that, due to the weakness of the above-mentioned exchange interactions, the presence of rare-earth atoms in the metal-polymer compounds containing iron atoms in a mixed valence, leads to an increase in spin relaxation time and slows down the reorientation of the magnetic moments. The latter leads to stabilization of magnetic ordering of transition metal atoms impurity levels, and respectively to a prolonged coexistence of domains of semiconductor and metal phases with a valences Fe2+ and Fe3+, respectively. The goal of the paper is to establish a coordination mechanism, which provides self-organization of Fe(II)complexes of nano-cyclic ligands formed from thiophene-pyrrole series oligomer in compressed Langmuir monolayers
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