On the mechanism of electrical conduction in some new quaternary salts of bipyridine and indolizine pyridine in thin films

Leontie, Liviu; Druţă, I.; Furdui, Bianca; Rusu, G.I.

doi:10.1016/j.porgcoat.2007.01.003

Cited by 10 publications

(1 citation statement)

References 48 publications

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“…[159] Τα μόρια των 11α και 11στ * To φαινακετυλοϊωδίδιο παρασκευάζεται μέσω γνωστής μεθόδου. [226] Βιολογόνο 13γ (4-Cl Ph ):…”

Section: επίδραση υποκαταστατών στα σύμπλοκα 11α-στunclassified

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Papadakis¹,

Παπαδάκης²

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Ιn this work, new heterocyclic products with structure based on 4,4'-bipyridine were designed and synthesized, and their ability to act as molecular switches and sensors was investigated.The first category of the synthesized compounds included complexes of iron(II) with Nmonosubstituted 4,4'-bipyridines (monoquats) acting as ligands. These products were proved to be solvatochromic. Significant shifts of the MLCT bands of these complexes, were observed under the alteration of the polarity of their environment. The impact of solvent polarity on the absorption spectra of the complexes was quantified using suitable empirical solvent polarity parameters. Through the resulting relationships the dominant solvent-solute interactions were revealed. The latter investigation was of great significance because it helped understanding their function as solvent polarity sensors with molecular dimensions. Furthermore the solvatochromism of these compounds was used in order to rationalize the molecular recognition effects taking place in the cybotactic region during the solvation of the solvatochromic solutes, in several binary solvent mixtures.Additionally some solvatochromic non symmetric viologens were synthesized. These products include an active methylene per molecule which is easily deprotonated even by relatively weak Lewis bases. A carbanion is formed even by simply dissolving the viologen in neat solvents, and that leads to the formation of a stable solvatochromic betaine readily affected by solvent polarity and solvent basicity. In the case of these compounds, the solvatochromic effects were quantified using suitable empirical parameters as well, including parameters describing solvent polarity and solvent basicity.Another family of new non symmetric viologens (N-methyl N'-aryl-viologens) were synthesized and their function as molecular sensors of ferrocyanide anions was studied. The pale yellow colored solutions of these compounds was observed to become deep blue in the presence of even small non stoichiometric quantities of ferrocyanide anions. The impact of the concentration of the mentioned anions on the PMR and UV-Vis-NIR spectra was also investigated. Additionally with the use of a suitable computer program, the LUMO energies of the electron withdrawing molecules (viologens) were calculated, and it was observed that they are perfectly correlated to the experimentally obtained maxima absorbance wavenumbers of the formed ionic pairs between the viologen cations and the ferrrocyanide anions. Thus the impact of the viologens' substituents on the stability of the excited states of the ionic pairs formed, was quantified.

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Section: επίδραση υποκαταστατών στα σύμπλοκα 11α-στunclassified

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Papadakis¹,

Παπαδάκης²

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Synthesis of Pyridine N‐Oxide–BF₂CF₃ Complexes and Their Fluorescence Properties

Nishida

Fukazawa

Yamaguchi

et al. 2014

Chemistry An Asian Journal

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Pyridine N-oxide-BF2CF3 and -BF2C2F5 complexes and their derivatives were synthesized. Most of the complexes show fluorescence both in solution and in the solid state. By expanding the π-conjugated skeleton, the color of the fluorescence could be changed dramatically. A fluorophore with a high solvent dependency could also be produced. Since such compounds can be synthesized on a gram scale in high yield, and are stable to oxygen, water, and heat, the complexes hold great potential as organic functional materials.

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Spectroscopic investigation of the solvatochromic behavior of a new synthesized non symmetric viologen dye: Study of the solvent–solute interactions

2010

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This work deals with the design, synthesis, and characterization of a new solvatochromic dye. The intense solvatochromic behavior of this new synthesized non symmetric viologen was investigated using UV-Vis spectrophotometry. A further purpose was the study of the interactions between the solvent and solute molecules responsible for the solvatochromism. Several protic and aprotic solvents were used, and the resulting absorption maxima wavenumbers obtained via UV-Vis spectrophotometry, were correlated with the solvent polarity parameters, E(T)(30) (Dimroth-Reichardt solvent polarity parameter) and the Gutmann's donor number (DN) using the biparametric model introduced by Krygowski and Fawcett. The analysis of the relative contribution of each parameter has clearly shown that the dominating interaction responsible for the solvatochromic behavior observed is the proton donation by the solute molecules to the solvent molecules, the latter acting as a Lewis bases. This is an interaction which can be described by DN. Additionally, the good correlation with the Kamlet-Taft parameter beta is in good agreement.

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On the mechanism of electrical conduction in some new quaternary salts of bipyridine and indolizine pyridine in thin films

Cited by 10 publications

References 48 publications

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Synthesis of Pyridine N‐Oxide–BF₂CF₃ Complexes and Their Fluorescence Properties

Spectroscopic investigation of the solvatochromic behavior of a new synthesized non symmetric viologen dye: Study of the solvent–solute interactions

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On the mechanism of electrical conduction in some new quaternary salts of bipyridine and indolizine pyridine in thin films

Cited by 10 publications

References 48 publications

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Σχεδιασμός Και Σύνθεση Ετεροκυκλικών Και Συμπλόκων Ενώσεων Και Η Λειτουργία Τους Ως Μοριακών Διακοπτών Και Αισθητήρων

Synthesis of Pyridine N‐Oxide–BF2CF3 Complexes and Their Fluorescence Properties

Spectroscopic investigation of the solvatochromic behavior of a new synthesized non symmetric viologen dye: Study of the solvent–solute interactions

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Synthesis of Pyridine N‐Oxide–BF₂CF₃ Complexes and Their Fluorescence Properties