1,3,4-Oxadiazole based ruthenium amphiphile for Langmuir-Blodgett films and photo-responsive logic gate construction
Autor: | Herbert Winnischofer, Henrique E. Toma, João Batista Marques Novo, Eduard Westphal, José P. M. Serbena, Karine P. Naidek, Koiti Araki, Ivo A. Hümmelgen, Denize Maria Hoffmeister, Elizangela Cavazzini Cesca |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Ligand General Chemical Engineering LIGANTES chemistry.chemical_element Oxadiazole 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Photochemistry 01 natural sciences Langmuir–Blodgett film 0104 chemical sciences Ruthenium Bipyridine chemistry.chemical_compound chemistry Monolayer 0210 nano-technology Coordination geometry |
Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
ISSN: | 0013-4686 |
Popis: | Amphiphilic ruthenium bipyridine complexes based on 1,3,4-oxadiazole-pyridine ligands (L1, L2) were synthesized and characterized by 1H NMR, UV–Vis spectroscopy, electrochemistry and UV–Vis spectroelectrochemistry. The free ligands and the respective ruthenium(II) complexes exhibit an intraligand π−π∗ absorption band in the UV region that overlaps with the MLCT bands. The [Ru(bpy)2(L2)](PF6)2 complex with a bidentated L2 ligand did not form a stable monolayer in water-air interface demonstrating the relevance of coordination geometry on the molecular packing properties. In contrast, stable Langmuir-Blodgett films of the [Ru(bpy)2(L1)Cl]PF6 complex (RuL1) exhibiting reversible and fast spectroelectrochemical properties associated with the Ru(III/II) redox couple were obtained, where redox site inactivation become relevant above 20 monolayers where the current leveled up. Thin LB films were deposited on poly(bithiophene) to enhance its photoelectrochemical properties and realize photoresponsive AND and OR logic gate devices. |
Databáze: | OpenAIRE |
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