Crown-substituted phthalocyanines—components of molecular ionoelectronic materials and devices

Martynov, Alexander G.; Gorbunova, Yulia G.; Tsivadze, А. Yu.

doi:10.1134/s0036023614140046

Cited by 39 publications

(21 citation statements)

References 141 publications

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“…By analogy with the reduction mechanism for metal por phyrins in the presence of dissolved oxygen proposed in [58], we can assume that in the studied systems at the first stage of reduction process intermediate com pounds form at the first stage of reduction process, decomposition of which allows one to obtain the spec tra of reduced forms of the complexes at potentials below -1.2 V. The most probable seems the interaction of cations contained in the electrolyte (proton or К + cations) with the nitrogen atoms of the negatively charged macrocycle. Such protonation of double decker lanthanide phthalocyaninates upon the reduc tion in solutions is described in [59]. A detailed eluci dation of the mechanisms and conditions of the observed transitions requires further investigation.…”

Section: Resultsmentioning

confidence: 97%

“…It should be noted that most studies of lanthanide tetra 15 crown 5 phthalocyaninates are aimed at studying the properties of solutions [25][26][27][28][29][30][31][32], and ultrathin films of double and triple decker phthalocy aninates remained virtually uninvestigated until present time. Studies of these films initiated by us [8][9][10] showed that the structure, optical, and charge trans port properties of assembled by LB technique crown phthalocyaninates stacks can be modulated both by the conditions of formation and by redox control sig nals.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemically controlled multistability of ultrathin films of double-decker cerium phthalocyaninates

et al. 2012

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The spectral and electrochemical properties of Langmuir-Blodgett (LB) films of homoleptic double decker cerium bis [tetra 15 crown 5] phthalocyaninate Ce [R 4 Pc] 2 and its heteroleptic analog [Pc]Ce[R 4 Pc] were studied. It was shown that during formation of Langmuir monolayers upon contact of both complexes solutions with water subphase the metal center with valent state IV in the solution transforms into one with the valent state III in the monolayer. Upon cyclic compression expansion of these monolayers, orientation induced reversible intramolecular transfers of electron from 4f orbital of cerium ion to the phth alocyanine macrocycle (compression) and in reverse direction (expansion) occur in a planar supramolecular system. Scheme of reversible electrochemical transformations occurring in ultrathin films of double decker cerium crown phthalocyaninates, one of which is associated with the Ce +3 /Ce +4 redox transition of metal center of the complex, was proposed and substantiated using the results of spectro electrochemical investi gations. It was shown that one of these transformations is associated with the Ce +3 /Ce +4 redox transition of metal center of the complex and upon change of metal center oxidation state its size changes, and, conse quently, the distance between the decks of the complex also changes. This change in the distance can lead to a substantial (13-15%) modulation of the linear size of molecular assemblies with a large number of mole cules in stack. On the basis of this effect the supramolecular device that can perform mechanical work can be developed. Using surface plasmon resonance technique we have demonstrated that a step change in electrode potential in region of 200-1000 mV induces a corresponding optical response reflected in a step change of the resonance angle. High operation speed and reversibility of switching between stable states can serve as a basis for development of optoelectronic switching systems.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Electrochemically controlled multistability of ultrathin films of double-decker cerium phthalocyaninates

et al. 2012

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“…Such interaction and spectra, similar to the ones obtained by us, was described for double-decker lanthanide phthalocyaninates in acidic solutions. [41,42] Precise establishment of the nature and mechanism of this process requires further studies with employment of a wider set of physico-chemical methods.…”

Section: Electrochemical Reduction Of Double-decker Phthalocyaninatesmentioning

confidence: 99%

The Role of Oxygen in Electrochemical Reduction of Double-Decker Phthalocyaninates of Lanthanides

Selektor¹,

Shokurov²,

Ревина³

et al. 2015

MHC

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“…Among donor components, phthalocyanines (Pc) and their analogues are widely used due to their peculiar optical and electronic properties,8, 9 as well as owing to their ability to form various condensed phases, like crystals and mesophases, and Langmuir‐Blodgett films, etc.,10–14 needed for the fabrication of materials.…”

Section: Introductionmentioning

confidence: 99%

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Marmé

Aupperle‐Pauls

Pauls

et al. 2014

Chemkon

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Zusammenfassung: Die Nanotechnologie in all ihren Facetten wird für die moderne Gesellschaft immer wichtiger und gilt als eine der Schlüsseltechnologien des 21. Jahrhunderts. In diesem Artikel werden schulgerechte Synthesen von Gold-und Silber-Nanopartikeln mit Hilfe eines Minilabors vorgestellt, die im außerschulischen Lernort, im Schüler-praktikum oder auch im Rahmen grçßerer Projekte eigenständig durchgeführt werden kçnnen. Außerdem wird ein schülerzentriertes Konzept für eine Nanotechnologie-Unterrichtseinheit vorgestellt, welches auf den Erwerb von den in den Bildungsplänen geforderten Schlüsselkompeten-zen zielt und den Schülerinnen und Schülern einen Einblick in den Wissenschaftsalltag und in wissenschaftliche Arbeitsund Vorgehensweisen geben soll.Stichworte: Gold-und Silber-Nanopartikel · Redoxreaktionen · Tyndall-Effekt Dwarf particles out of a Mini Lab -Synthesis of metallic nanoparticlesAbstract: Nanotechnology and its broad range of applications are becoming more and more important for modern society. It is said to be one of the key technologies of the current century. This article shows ways of implementing nanotechnology in schools. The presented syntheses of gold and silver nanoparticles were carried out in a miniaturized lab and adapted for use in class. They are appropriate to be carried out by the pupils themselves in school or in science centers, in brief or in longer projects. Furthermore, a student-centered teaching concept for a complete nanotechnology unit focused on key qualifications as claimed by the national curricula is presented. Students can learn about scientific work methods and get an insight view of scientific daily routine.

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Crown-substituted phthalocyanines—components of molecular ionoelectronic materials and devices

Cited by 39 publications

References 141 publications

Electrochemically controlled multistability of ultrathin films of double-decker cerium phthalocyaninates

Electrochemically controlled multistability of ultrathin films of double-decker cerium phthalocyaninates

The Role of Oxygen in Electrochemical Reduction of Double-Decker Phthalocyaninates of Lanthanides

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