Peculiarities of the reflection-absorption and transmission spectra of ultrathin films under normal incidence of light

Stuchebryukov, S. D.; Selektor, S. L.; Silantieva, D. A.; Shokurov, Alexander V.

doi:10.1134/s2070205113020044

Cited by 40 publications

(27 citation statements)

References 26 publications

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“…In order to reveal the possibility of a redox isomerization in monolayers of Ce[(15C5) 4 Pc] 2 we recorded in situ UV−vis differential reflection−absorption spectra (DRAS) 44 of these monolayers at the air−water interface. They were recorded 15− 20 min after spreading to achieve a complete evaporation of solvent and the completion of the spreading process.…”

Section: Resultsmentioning

confidence: 99%

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Orientation-Induced Redox Isomerism in Planar Supramolecular Systems

et al. 2014

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In this work, a previously undescribed phenomenon of orientation induced redox isomerism in a Langmuir monolayer is revealed in the case of cerium bis [tetra (15 crown 5) phthalocyaninate] (Ce[(15C5) 4 Pc] 2 ). It was established that intramolecular electron transfer (IET) from the electronic system of phthalocyanine to the 4f orbital of cerium atom occurs upon spreading of a (Ce[(15C5) 4 Pc] 2 ) chloroform solution onto the air−water interface (3D → 2D IET). This process is related to the transformation of Ce 4+ cation in the solution to Ce 3+ in the monolayer. It was also found that reversible Ce 3+ ↔ Ce 4+ IETs occur upon compression (π 1 → π 2 ) and expansion (π 2 → π 1 ) of monolayer (2D π1 ↔ 2D π2 IET, π surface pressure). The mechanism of genuine redox isomerism was confirmed by the results of in situ UV−vis spectral measurements performed on monolayers and Langmuir−Blodgett films, AFM, and XPS studies of Langmuir−Blodgett films transferred at different surface pressures. The understanding of this reversible IET mechanism is especially important due to possible applications of such redox isomeric systems in the development of nanoscale multibit information storage devices.

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Section: Resultsmentioning

confidence: 99%

“…This technique was described in details elsewhere. 44 Absorption spectra of LB films on quartz substrates were measured in the wavelength range of 200−900 nm using a Shimadzu 2450 PC spectrophotometer (Japan).…”

Section: Methodsmentioning

confidence: 99%

Orientation-Induced Redox Isomerism in Planar Supramolecular Systems

et al. 2014

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“…[34] For fluorescence measurements, the UV-Vis reflectometric probe with a fiber diameter of 600 mm was also placed perpendicularly at 2-3 mm to the monolayer surface. Additional light-emitting diodes were used with an emission band as close as possible to the principal absorption band of the dye molecules in the monolayer.…”

Section: Methodsmentioning

confidence: 99%

Factors Affecting the Structural Organization of Hemicyanine Chromoionophores in Langmuir Monolayers

Shokurov¹,

Silant’yeva²,

Arslanov³

et al. 2016

MHC

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“…Spectral control of the compounds at the interface was carried out using fiber optic UVvis spectroscopy technique, described by us previously. [30] Transfer of the monolayers onto ITO electrodes for electrochemical and spectroelectrochemical measurements was performed according to Langmuir-Blodgett method (vertical transfer) at maintenance of constant surface pressure. Experimental conditions for the transfer were following: room temperature of the subphase, barrier speed 10 mm/min, surface pressure of 30 mN/m, dipper speed of 5 mm/ min, transfer ratios for the monolayer films was in the range from 0.7 to 0.9.…”

Section: Methodsmentioning

confidence: 99%