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Profile dyfuzji barwnika solwatochromowego w poliamidzie 6

Wróblewska E. K., Soroka J. A., Sawicka M. J., Rosłaniec Z.

Przemysł Chemiczny

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2016

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T. 95, nr 4

834--837

PL

Przedstawiono wyniki badań dyfuzji wybranego barwnika solwatochromowego w poliamidzie 6. Badania przeprowadzono w trzech różnych temperaturach wcześniej zaproponowaną przez autorów metodą wyznaczania profili dyfuzji na podstawie mikroskopowych obrazów przekrojów granulek polimeru. Stwierdzono, że dyfuzję w badanym polimerze można scharakteryzować za pomocą jednego współczynnika dyfuzji, którego wartość wyliczono z równania wynikającego z II prawa dyfuzji Ficka, z wykorzystaniem funkcji erf.

EN

Com. polyamide grains were dyed at 66–86°C for 192 h with 5-(5-nitro-6-hydroxynaphtholane-2)-7,7-dimethyl-7H-indolyl[1,2-a]quinolinium dye to det. the diffusion coeffs. The dyed grains were sliced and studied by light microscopy for dye diffusion profiles. The results were approximated math.

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A new method for the preparation of solvatochromic 5-(5-X-6-hydroxynaphthyl-2)-7H-indolo[1,2-a]quinolinium merocyanines

Sawicka M.J., Soroka J.A., Gąsiorowska M.

Polish Journal of Chemical Technology

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2010

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Vol. 12, nr 1

17-22

EN

A new method for the preparation of 7H-indolo[1,2-a]quinolinium solvatochromic dye precursors has been investigated. 5-(6-Hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate, 5-(5-bromo-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate and 5-(5-nitro-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate were obtained via demethylation of the corresponding 5-(5-X-6-methoxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium salts. The application of pyridinium hydrochloride in the demethylation of the methoxy perchlorates allowed to obtain the products with the almost quantitative yield in a very short time, especially when the reaction was carried out using microwave irradiation.

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Novel solvatochromic 1,3,2-dioxaborines as composition indicators in analysis of organic solvent mixtures

Zawadzka I.K., Soroka J. A., Gąsiorowska M., Sawicka M. J.

Chemia Analityczna

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2008

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Vol. 53, No. 1

83-107

EN

New, solvatochromic dioxaborine-like dyes were synthesized and examined as polarity indicators in pure solvents. Next, they were employed in a quantitative analysis of the binary and ternary mixtures with the use of the SA-SAB-SB model and on the basis of the equations describing 3rd order surfaces, respectively.

PL

Nowe, solwatochromowe pochodne dioksaboraarenów zsyntetyzowano i przebadano w czystych rozpuszczalnikach pod kątem możliwości zastosowania ich jako indykatorów polarności. Następnie zostały użyte w analizie ilościowej dwu- i trójskładnikowych mieszanin za pomocą odpowiednio: modelu SA-SAB-SB i metody powierzchni kalibra-cyjnych.

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Mikrofale w syntezie organicznej

Sawicka M.J., Soroka J.A., Soroka K.B., Gąsiorowska M.

Wiadomości Chemiczne

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2007

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[Z] 61, 11-12

891-911

EN

The interest in the microwave assisted organic synthesis has been growing during the recent years. It results from an increasing knowledge of fundamentals of the dielectric heating theory, availability of an equipment designed especially for the laboratory use as well as the discovery of the special techniques of the micro-wave syntheses. There are two different mechanisms of transformation of microwave energy into heat. The first one is the dipolar polarization. The electric field of electromagnetic irradiation causes such a change in the polar molecules orientation, that they align their dipole moments with the force field lines. Another way of the microwave - molecule interaction that leads to heat evolution bases on the ionic conduction phenomenon. It originates from a presence of ionic species in the materials. Under the influence of the alternating dielectric field ions start to move through the solution, resulting in an increased collision rate, and the kinetic energy is converted into heat. The microwave activation in organic synthesis leads to considerable acceleration of a chemical reaction as compared to the traditional thermal process. It originates from the thermal effects, i.e. a change of the temperature profile during the process, the existence of so-called "hot spots" and the ability of solvent heating above its normal boiling point as well as the specific (no thermal) effects, connected with a change of the activation energy of the reaction and the activity of molecules. Moreover, microwave irradiation can also change direction, yield and selec-tivity of a chemical reaction. The extent of these changes depends on a solvent pola-rity and polarity of the ground and transition states of reagents. The microwave syntheses are performed in multimode or single-mode cavities, with respect to the mode of the irradiation distribution over the working compartment. The most popular techniques of microwave enhanced syntheses are as follow: syntheses in a solvent, solvent-free syntheses and supported syntheses. The application of one of them depends on the solvent and/or reagents properties as well as the reaction conditions.

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Calibration surfaces in analysis of ternary mixtures. Part 2. Degree of analytical utility of solvatochromic indicator

Wróblewska E. K., Soroka J. A., Soroka K. B., Gąsiorowska M., Sawicka M. J.

Chemia Analityczna

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2004

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Vol. 49, No. 5

729-738

EN

Applicability of dyes as solvatochromic indicators has been discussed. New parameter au, qualifying a degree of analytical utility of a dye has been introduced for six solvatochromic merocyanines and betaines based on 7H-indolo[1,2-a]quinoline system. These compounds were used for the quantitative analysis of water-methanol-ethanol ternary mixture. Accuracy of the analysis was evaluated by comparing the results obtained with dyes of maximum and minimum au.

PL

Opisano prostą metodę ilościowej oceny jakości barwnika wykorzystywanego jako wskaźnik solwatochromowy. Zaproponowano nowy parametr a określający stopień użyteczności analitycznej, na podstawie którego oceniono przydatność sześciu solwatochromowych merocyjanin/belain 7H-indolo [ 1,2-aJchinoliniowych, wykorzystanych w analizie ilościowej mieszaniny trójskładnikowej woda-metanol-etanoi. Uzyskane wyniki zweryfikowano dla dwóch barwników: o najwyższej oraz najniższej wartości wyznaczonego parametru a(u) .