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Dive into the research topics where Jacek A. Soroka is active.

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Featured researches published by Jacek A. Soroka.


Journal of Physical Organic Chemistry | 1997

Solvatochromism of dyes. Part III. Solvatochromism of merocyanines in some binary mixtures of solvents.SA–SAB–SB, a new model of solvatochromism

Jacek A. Soroka; Krystyna B. Soroka

A quantitative model of solvatochromism in a binary solvent system is presented. Although it is derived for merocyanine and betaine dyes, it explains a majority of known examples of solvatochromism in binary solvents. The model provides an estimation of equilibrium constants between particular types of solvates present therein. UV–VIS absorption spectra of solvated species can be simulated. They perfectly fit the experimental data. The model proposed describes the internal solvent picture from the solute point of view, which differs from other known models and may be useful for studying the structure of liquids


Tetrahedron Letters | 1980

Photochemical synthesis of 7H-indolo[1,2-a]quinolinium salts - a new ring system

Krystyna B. Soroka; Jacek A. Soroka

Abstract Photodehydrocyclization of 1-phenyl-2-/2-arylethenyl/-3,3-dialkyl-3H-indolium cations leads in very good yield to 7H-indolo[1,2-a]quinolinium cations.


Journal of Luminescence | 1991

Pyrylium and thiopyrylium high efficiency laser dyes

Tomasz Kotowski; W. Skubiszak; Jacek A. Soroka; Krystyna B. Soroka; Tadeusz Stacewicz

Abstract The laser emission of 34 pyrylium and 2 thiopyrylium salts under nitrogen laser excitation has been investigated and compared with that of Rhodamine 6G and Coumarin 102. Twenty compounds manifest a lasing efficiency higher than 10%. For some of them the lasing range covers more than 80 nm.


Journal of Photochemistry and Photobiology A-chemistry | 1992

Photochemistry of hemicyanines IV: Synthesis of (±) 5,6-dihydronaphto[2,1-c]-quinolizinium salts

Jacek A. Soroka

Abstract 1-(Naphtyl-1)-2-(2-arylethenyl)-4,6-diaryl-pyridinium perchlorate hemicyanines undergo E—Z photoisomerization and photocyclization charateristic of the 3-azoniahexa-1,3,5-triene system which is followed by a rearrangement along two paths — a [1,5]-sigmatropic hydrogen-shift (minor) and a [1,5] base catalysed two-stage hydrogen-shift (major) — into (±) 5,6-dihydronaphto[2,1- c ]quinolizinium perchlorates.


Journal of Photochemistry and Photobiology A-chemistry | 1993

Photochemistry of hemicyanines Part VII. Photochemistry of 2,3-diaryl-1H-isoindolium salts

Jacek A. Soroka; Irena W. Bogdańska; Andrzej R. Kośmider; Krystyna B. Soroka

Abstract 1,1-Dimethyl-2,3-diaryl-1H-isoindolium salts undergo two-step phototransformation with the first step being photoreversible. The photoreaction, which is characteristic of the 3-azoniahexa-1,3,5-triene system, leads through a “dihydro” intermediate to 10,10-dimethyl-10H-isoindolo[3,2-f]phenanthridinium salts, the first known derivatives of the new heteropolycyclic system. The primary product of phototransformation undergoes oxidation by three competitive routes or is stabilized by β-elimination of a stable molecule (e.g. methanol). The direction of phototransformation is strongly dependent on the acidic—basic properties of the solvent.


Second Symposium on Laser Technology | 1987

New Donor - Acceptor Chromogene Laser Dyes Generating In The Visible Spectral Range

Tomasz Kotowski; W. Skubiszak; Jacek A. Soroka; Krystyna B. Soroka; Tadeusz Stacewicz

Lasing properties of 20 new dyes generating in 480-705 nm spectral range under pulsed nitrogen laser exitation are presented. Dyes with donor - acceptor chromogene are of the main importance in the laser techniques. The best known as Coumarines, Rhodamines or Oxazines etc. are widely used for generation of a tunable laser light in a whole visible spectral range. In this paper we would like to present lasing properties of four new groups of this kind of dyes. General structures of presented groups of dyes are shown in Figures 1 (a-d). In Table 1 full chemical names as well as radicals for all the dyes are given. The methods of the chemical synthesis of these dyes were described in our previous papers.


Journal of Photochemistry and Photobiology A-chemistry | 1998

Evidence of the specific solvation of selected fluorescent dyes with methoxy group and its analogues derivatives of the 7H-indolo[1,2-a]quinolinium system

Jacek A. Soroka; Barbara Komorowska; Krystyna B. Soroka; Jürgen Bendig

Abstract The fluorescence quantum yield of the 5-(4-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate and its analogues was determined in 12 selected solvents of the hydroxyl and CH-acid type and in the dichloromethane–acetonitrile binary system at constant and variable temperature. The quenching process, which depends on the dye and solvent structure, in hydroxylic ones was caused by dissociation of the solvent–dye complex. A rare phenomenon of the dye fluorescence quantum yield raising along with the increase in temperature is observed. It has been proved that methoxy group and its derivatives is a negatively charged complexing centre and the complex stability raises along with the increasing electron donor character of alkyl fragment. This conclusion is supported by theoretical calculations of bonding energy. The important role of a local dielectric constant and the method of its calculation are discussed.


Szczecin - DL tentative | 1991

9H-Indolo(1,2-f) phenanthridinium hemicyanines: a new group of high-efficiency broadband generating laser dyes

Tomasz Kotowski; W. Skubiszak; Jacek A. Soroka; Krystyna B. Soroka; Tadeusz Stacewicz

The lasing properties of a new group of hemicyanine dyes in acetonitrile solution under the nitrogen laser excitation are pre sented.


Journal of Physical Organic Chemistry | 1991

Solvatochromism of dyes. Part I. Solvatochromism of merocyanines. Derivatives of the 7H-indolo [1,2-a] quinolinium system. A new model of solvatochromism

Jacek A. Soroka; Krystyna B. Soroka


Journal of Physical Organic Chemistry | 2005

Solvatochromism of dyes. Part IV—Energetic characteristics of merocyanine derivatives of 1‐phenyl‐2‐[2‐(3‐X‐4‐hydroxy‐5‐R‐phenyl)ethenyl]‐3,3‐dimethyl‐3H‐indolium cation

Elwira K. Wróblewska; Jacek A. Soroka; Krystyna B. Soroka; Monika Ga̧siorowska

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Zbigniew Roslaniec

West Pomeranian University of Technology

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Jürgen Bendig

Humboldt University of Berlin

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