Crown-ether lutetium bisphthalocyanine Langmuir-Blodgett films as gas sensors

Rodrı́guez-Méndez, M.L.; Souto, J.; Saja-González, J. de; Saja, J.A. de

doi:10.1016/0925-4005(96)80016-5

Cited by 39 publications

(24 citation statements)

References 12 publications

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“…For LuPc 2 it is known that this complex can be easily oxidised respectively reduced [3]. LuPc 2 is used for the fabrication of gas sensors or OFETS [4,5]. The properties of these devices are affected by the environmental conditions.…”

mentioning

confidence: 99%

Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Seidel

Fronk

Himcinschi

et al. 2010

Phys. Status Solidi (c)

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The main aim of this work is to investigate organic thin films by the use of Reflection Anisotropy Spectroscopy (RAS) and Spectroscopic Ellipsometry (SE) in situ during growth of the thin films on silicon substrates. The investigated material is the rare‐earth diphthalocyanine LuPc2. The LuPc2 films were deposited on hydrogen passtivated Si(111) and on oxidised Si substrates by Organic Molecular Beam Deposition (OMBD). The films on H‐Si(111) show a high anisotropic behaviour. Model calculations for in situ SE measurements revealed angles between θ = 60° and 90° for LuPc2 on H‐Si(111). Furthermore, the energy transitions found match to those determined by Density Functional Theory calculations (DFT). (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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mentioning

confidence: 99%

Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Seidel

Fronk

Himcinschi

et al. 2010

Phys. Status Solidi (c)

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“…Previously, in the potential range under consider ation, one to three peaks were observed in the CVs of unsubstituted and substituted bisphthalocyaninates of REEs [7,[32][33][34]. For Sm[(ОC 3 H 7 ) 8 Pc] 2 LBFs on ITO in aqueous solutions of potassium chloride and chlor ate, in a potential range of from -0.6 to +1.4 V (Ag + /AgCl), only one peak was detected, which corre sponded to the single electron oxidation of the phtha locyanine ring [33].…”

Section: Resultsmentioning

confidence: 99%

“…The absence of the peak for the reduction of the neutral form to the anionic one was explained by the effect of donor propoxy groups, which hinder the reduction of the complex in this potential range. Like in our experiments with LBFs of trivalent lanthanides, two peaks were registered for the LBFs of lutetium octa (15 crown 5) phthalocyani nate, Lu(R 4 Pc) 2 , on ITO electrodes [32] and its films formed by spin coating on SnO 2 [34]. In the authors' opinion, these peaks are due to the transition of the neutral green form into the orange oxidized [Lu(R 4 Pc) 2 ] + and blue reduced [Lu(R 4 Pc) 2 ] -forms.…”

Section: Resultsmentioning

confidence: 99%

Orientation-induced redox transformations in Langmuir monolayers of double-decker cerium bis[tetra-(15-crown-5)-phthalocyaninate] and multistability of its Langmuir-Blodgett films

et al. 2012

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The spectral, electrochemical, and optical properties of Langmuir-Blodgett films (LBFs) and cast films from a solution of new double decker cerium bis[tetra (15 crown 5) phthalocyaninate] (Ce(R 4 Pc) 2 ) are studied. Based on analysis of compression isotherms and quantum chemical calculations, schemes of the organization of Ce(R 4 Pc) 2 molecules at different states of its monolayers are proposed. Cor relation dependences are determined in order to relate the optical and electrochemical characteristics of monolayers and LBFs of sandwich type lanthanide phthalocyaninates to the ionic radii of their metal centers. The valent state of Ce ions in a monolayer forming complex is determined, and a sequence of redox trans formations occurring in LBF uppon appliance of a potential is proposed, one of the transformations being associated with the Ce 3+ /Ce 4+ redox transition. Orientation induced intramolecular electron transfer is revealed in the planar supramolecular system. It is shown that, during the formation of a monolayer from a Ce(R 4 Pc) 2 solution, a tetravalent metal center passes to a trivalent state. Monolayer compression to a high surface pressure reverts the complex to the electronic state typical of the solution. The reversible transforma tions observed upon the monolayer compression result from intramolecular electron transfer from the 4f orbital of Ce to the phthalocyanine ring and backwards. The high operation rate and the reversibility of switching between the stable states, which are determined by means of the surface plasmon resonance tech nique, upon a stepwise change in the electrode potential within the range of 200-850 mV may underlie the development of optoelectronic systems. With a large number of molecules in a stacking aggregate, changes in the distance between the decks of the complex that occur with changes in the oxidation level of the metal cen ter can substantially modulate the sizes of molecular ensembles. A supramolecular device capable of perform ing mechanical work can be developed based on this effect.

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“…[10,[35][36][37][38] However, researchers never attached any importance to this phenomenon. At the same time, observed behavior of the system allows us to assume that reduction of lanthanide bis-phthalocyaninates under considered conditions occurs in a multistage manner, and only the first electrochemical stage of this process occurs at redox-transition observed on voltammogram.…”

Section: Electrochemical Reduction Of Double-decker Phthalocyaninatesmentioning

confidence: 99%

“…However, for any of the studied compounds even extended (up to 20 min) exposition of the electrode with the film at potential of -0.3 V (more than 0.2 V below the reduction peak on CV curve), as in the case of solutions, does not allow one to obtain a spectrum with sharply pronounced non-split short wavelength Q-band and significantly repressed band around 500 nm, which is usually assigned to the reduced double-decker phthalocyaninates of metals in the literature. [10,19,26,27,[34][35][36] Substitution of the working electrolyte (0.1 M perchloric acid) by 0.1 M solution of potassium perchlorate allowed us to visually confirm the high degree of the completeness of the redox-processes in the films. Change of the electrolyte acidity did not lead to significant changes of the CV curves' shape for LBF of 15-crown-5 substituted bis-phthalocyaninates of lanthanides.…”

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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Crown-ether lutetium bisphthalocyanine Langmuir-Blodgett films as gas sensors

Cited by 39 publications

References 12 publications

Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Orientation-induced redox transformations in Langmuir monolayers of double-decker cerium bis[tetra-(15-crown-5)-phthalocyaninate] and multistability of its Langmuir-Blodgett films

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

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