Specific features of the two-photon absorption of cationic symmetric polymethine dyes

Светличный, В. А.; Bazyl, O. K.; Artyukhov, V. Ya.; Kopylova, T. N.; Derevyanko, N. A.; Ishchenko, A. A.

doi:10.1134/s0030400x07110124

Cited by 7 publications

(7 citation statements)

References 23 publications

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“…Three of the iodide salts (12a, 13a, 14a) were successfully crystallized and single crystal X-ray diffraction analysis was carried out. (14). (Syntheses of iodide salts 2a-9a, and 14a, and trifluoromethanesulfonate salts 2c and 9c have been previously reported, but the data available is limited to spectroscopic results without physical characterization.…”

Section: Resultsmentioning

confidence: 99%

“…Current literature reports of the use of this cation are limited, [6][7][8][9] but it has been suggested that benzothiazolium salts posses catalytic activity 10 in certain organic reactions 11 such as benzoin condensations. 12,13 Benzothiazoles have also found many applications in the field of dyes 14 (e.g., direct yellow 7 15 ) and in medicine where benzothiazolium salts play an important role in pharmaceuticals (e.g., Riluzole 16 is a benzothiazole-based drug that is used to treat amyotrophic lateral sclerosis).…”

Section: Introductionmentioning

confidence: 99%

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Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: precursors to ionic liquids

Nadeem¹,

Munawar²,

Ahmad³

et al. 2010

Arkivoc

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This paper is dedicated to Professor Richard A. Bartsch on the occasion of his 70thbirthday and retirement Abstract A series of 13 benzothiazolium iodide salts have been prepared in solvent-free conditions by optimizing the reaction. An additional 26 benzothiazolium salts with bistrifluoromethanesulfonimide and trifluoromethylsulfonate were prepared via simple metathesis reactions from the iodide precursors. Out of a total of 39 prepared salts, 26 were identified as ionic liquids, with melting points as low as 42 o C observed for dodecylbenzothiazolium bistrifluoromethanesulfonimide. All prepared compounds have been characterized using FTIR, 1 H, 13 C NMR, and HRMS analyses. The thermal stabilities as well as melting points of these salts were also analyzed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: precursors to ionic liquids

Nadeem¹,

Munawar²,

Ahmad³

et al. 2010

Arkivoc

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“…Such a situation can become particularly noticeable for a number of dyes if any other concurrent channel for deactivation of the excited state is additionally excluded during the transition from the liquids to the polymer. For example such a channel in polymethine dyes is photoisomerization about the bonds of the polymethine chain [9,[52][53][54][55]. In liquid solvents its rate constants are several orders of magnitude greater than the analogous constants for intercombination conversion, as a result of which the transition to the triple is insignificant in polymethine dyes [9].…”

mentioning

confidence: 96%

“…The fact is that the bands for their absorption due to electronic transitions to higher excited states lie in this region. Although these transitions are as a rule 1-1.5 orders of magnitude lower in the intensity of the main long-wave transitions, by giving rise to the absorption of UV radiation [58][59][60][61] they serve as a reason for the photodegradation of the dyes [62]. As a rule it takes place by a radical mechanism.…”

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confidence: 99%

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

Self Cite

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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“…Benzothiazoliums are also a part of many important dyes (Svetlichnyĭ et al 2007) e.g Cyanine Dyes, Thioflavin T & S, (Stsiapura et al 2007) (Sabaté&Saupe 2007) Direct yellow 7, Carnotine, Primuline, etc. In medicine the benzothiazolium salts play an important role, for example Riluzole a benzothiazole-based drug is used to treat amyotrophic lateral sclerosis.…”

Section: Benzothiazolium Salts and Ionic Liquidsmentioning

confidence: 99%

Thiazolium and Benzothiazolium Ionic Liquids

Munawar¹,

Nadeem²

2011

Ionic Liquids - Classes and Properties

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Specific features of the two-photon absorption of cationic symmetric polymethine dyes

Cited by 7 publications

References 23 publications

Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: precursors to ionic liquids

Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: precursors to ionic liquids

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Thiazolium and Benzothiazolium Ionic Liquids

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