Synthesis of cyclo[8]pyrrole–polyoxometalate double-decker complex

Okujima, Tetsuo; Matsumoto, Hiroki; Mori, Shigeki; Nakae, Takahiro; Takase, Masayoshi; Uno, Hidemitsu

doi:10.1016/j.tetlet.2016.06.021

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…In a real POM/SWNT network, the occurrence and disappearance of highly conductive passes should be caused by complex chemical reaction phenomena. The reaction centre is electro-chemical reduction 33 , i.e. multiple electron charging entailing structural change of POMs 31 .…”

Section: Resultsmentioning

confidence: 99%

A molecular neuromorphic network device consisting of single-walled carbon nanotubes complexed with polyoxometalate

et al. 2018

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In contrast to AI hardware, neuromorphic hardware is based on neuroscience, wherein constructing both spiking neurons and their dense and complex networks is essential to obtain intelligent abilities. However, the integration density of present neuromorphic devices is much less than that of human brains. In this report, we present molecular neuromorphic devices, composed of a dynamic and extremely dense network of single-walled carbon nanotubes (SWNTs) complexed with polyoxometalate (POM). We show experimentally that the SWNT/POM network generates spontaneous spikes and noise. We propose electron-cascading models of the network consisting of heterogeneous molecular junctions that yields results in good agreement with the experimental results. Rudimentary learning ability of the network is illustrated by introducing reservoir computing, which utilises spiking dynamics and a certain degree of network complexity. These results indicate the possibility that complex functional networks can be constructed using molecular devices, and contribute to the development of neuromorphic devices.

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Section: Resultsmentioning

confidence: 99%

A molecular neuromorphic network device consisting of single-walled carbon nanotubes complexed with polyoxometalate

et al. 2018

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“…1 Whereas typical porphyrins coordinate with various metal ions, cyclo [n]pyrroles coordinate with a counteranion placed into the central cavity because of the dicationic character conferred to the macrocycles upon diprotonation. Selective anion extraction, 2 electron transfer between the macrocycle and the anion, 3 and a supramolecular double-decker complex 4 have been reported, resulting from the unique anion-binding properties.…”

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confidence: 99%

Cyclo[9]pyrrole: Selective Synthesis of [34]Nonaphyrin(0.0.0.0.0.0.0.0.0)

et al. 2021

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Cyclo[9]pyrrole, a ring-expanded porphyrin without meso-bridges and having an odd number of pyrroles, was synthesized via the oxidative coupling of 2,2′:5′,2″-terpyrrole. X-ray crystallography showed a C 2-like symmetry with a large root-mean-square deviation. The optical properties and electronic structures were analyzed using magnetic circular dichroism spectroscopy and time-dependent density functional theory calculations.

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“…Одной из актуальных задач для газового анализа является селективное измерение концентрации водорода с высокой чувствительностью от нескольких ppm до объемных процентов с учетом того, что водород может находиться в смеси с другими газообразными веществами и парами воды. [4].…”

Section: р и с 1 структура полипирролаunclassified

Hydrogen Gas Sensor Based on Polypyrrol Modified by Dawson Type Heteropolianion

Feofanova¹,

Радин²,

Крылов³

et al. 2020

Вестник Тверского Государственного Университета. Серия: Химия

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В статье рассмотрена возможность модифицирования полипиррола анионным комплексом вольфрамовой гетерополикислоты типа Доусона, имеющей химическую формулу H[PWO], и дальнейшего использования модифицированного полипиррола для создания на его основе сенсора на газообразный водород. Фосфорновольфрамовая кислота типа Доусона была синтезирована по методу Дрекселя и выделена эфиратной экстракцией. Анализ свойств гетерополикислоты и модифицированного гетерополикислотой полипиррола был осуществлен методами амперометрии и РФС, а также фотохимически. Модифицирование полипиррола гетерополианионом 2-18 ряда было проведено электрохимическим методом. Была оценена возможность использования такого газового сенсора для анализа газообразного водорода в большом интервале концентраций (от десятых единиц ppm, до объемных процентов). Было также частично определено влияние таких климатических факторов, как влажность и температура, и была оценена перекрестная чувствительность на ряд не измеряемых компонентов. This article discusses material on electrochemistry and the application of polypyrrole, which belongs to the class of «conductive polymers». The possibility of its modification by the anionic complex of a phospho tungsto-vanadic acid of the Dawson type, with the chemical formula H[PWO], and further use of the modified polypyrrole to create a hydrogen gas sensor based on it, is considered. Phospho tungsto-vanadic heteropoly acid of the Dawson type was synthesized with the known method [1, p. 180-181], and isolated by ether extraction. The analysis of properties, heteropoly acid content, and polypyrrole modified with a heteropoly acid was carried out by amperometry and XPS methods, as well as photochemically. Modification of polypyrrole heteropolyanion of 2-18 type was carried out by the electrochemical method. The presence of the heteropoly anion in the structure of the heteropoly acid-modified polypyrrole film during the repeated washing with water indicates the formation of a chemical bond between the anion of the heteropoly acid and the chain of the conductive polymer, which was also indirectly confirmed by amperometry and element analysis, as well as a positive test result of testing the sensitivity of the gas cell to hydrogen made on the basis of obtained modified polypyrrole. The possibility of using such the gas sensor to measure hydrogen in a wide range of concentrations (from tenths of ppm to volume percent) was evaluated. The influence of ambient factors such as humidity and temperature was also partially determined, and cross sensitivity to a number of unmeasured components was evaluated.

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Synthesis of cyclo[8]pyrrole–polyoxometalate double-decker complex

Cited by 5 publications

References 19 publications

A molecular neuromorphic network device consisting of single-walled carbon nanotubes complexed with polyoxometalate

A molecular neuromorphic network device consisting of single-walled carbon nanotubes complexed with polyoxometalate

Cyclo[9]pyrrole: Selective Synthesis of [34]Nonaphyrin(0.0.0.0.0.0.0.0.0)

Hydrogen Gas Sensor Based on Polypyrrol Modified by Dawson Type Heteropolianion

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