Radosław Motyka

Centre of Polymer and Carbon Materials

Fullerenes have been long investigated for application as singlet oxygen sources. Even though they possess high photosensitizing efficiency, their practical use is still limited, mostly because of insufficient absorption of visible and/or near-infrared light. This limitation can be overcome by introducing organic chromophores that absorb longer-wav...

Within the presented work, we propose a complex photoemission-based approach for the investigation of the C60ThSe2 dyad (C60ThSe2)/indium-tin oxide (ITO) interface formation. For surface topography and basic morphology determination, atomic force microscopy was utilized, and the results showed that C60ThSe2 agglomerated into close-to-spherical crys...

Poly(3-hexylthiophene) thin films containing carbon-based nanostructures, i.e. fullerenes such as buckminsterfullerene (C60) or phenyl-C61-butyric acid methyl ester (PCBM), or single-walled carbon nanotubes, were investigated as heterogeneous photosensitizers producing singlet oxygen (¹O2) in aerated organic solvents. Thin films were deposited on b...

Herein, we examine the synthesis of new polymers and characterize their physicochemical properties. A series of novel polymers based on polymethylsiloxane by catalytic hydrosilylation were successfully designed and synthetized. In order to enhance the polymers solubility, perylene diimide acted as the active functional group and poly(ethylene glyco...

A mixture of three constitutional isomers containing terminal reactive phthaloperinone units was obtained by the condensation of 4,4’-(4,4’-isopropylidenediphenoxy)bis(phthalic anhydride) with 1,8-naphthalenediamine. Both terminal units underwent an addition reaction via electrochemical oxidation and subsequent reduction at the perimidine core and...

A selenophene-containing fullerene dyad (C60Se) was electrochemically co-deposited with bis-selenophene (BisSe) to form a visible light absorbing poly(selenophene) layer with incorporated fullerene photosensitizers on platinum (Pt) or indium-tin oxide (ITO) substrates. The resulting photoactive films (P(C60Se_BisSe)) were characterized by cyclic vo...

We present the synthesis of amidine derivatives and the separation of their isomers obtained after the reaction of different bis(phthalic anhydrides) with 1,8-diaminenaphtalene (1,8DAN). The isolated isomers of 4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) significantly differed in their optical and electrochemical properties, sh...

Different donor-acceptor-donor (D-A-D) and donor-π-bridge-acceptor-π-bridge-donor (D-π-A-π-D) systems based on quinoxaline acceptor are compared. A significant difference in electrochemical and photophysical properties was found depending on molecular structure. A luminescence shift from 539 nm up to 671 nm was observed upon extension of conjugatio...

The photoactive layers of poly(terthiophene) with covalently attached fullerene photosensitizers were formed on ITO substrate in the process of electrochemical polymerization from the solution of corresponding terthiophene – C60 dyad. Two dyads were studied: without (C60TTh) or with (C60TThVin) vinyl spacing between C60 and TTh units. The deposited...

A series of novel donor–acceptor D–π–A–π–D compounds were synthesized and characterized in order to determine the influence of different acceptor units on their properties. The introduction of acceptor moieties had a direct impact on the HOMO and LUMO energy levels. Fluorescence spectra of compounds can be changed by the choice of an appropriate ac...

Thianthrenes have been nearly forgotten as phosphors in recent years, but are now coming back, showing their strong potential in luminescent applications. Here, we present a comprehensive photophysical study of a carbazolyl derivative of thianthrene in different matrices and environments. The diffusion of oxygen is slowed down in the rigid environm...

Thermally-activated delayed fluorescence has been found in a group of tricarbazolylamines which are purely electron-donating, non-charge transfer (CT) molecules. We show that the reverse intersystem crossing step in these materials is mediated through upper triplet states. Reverse internal conversion is shown to be the thermally-activated mechanism...

This work shows a study of two organic molecules with very similar, large singlet-triplet gap of which one is a TADF emitter and the other an RTP emitter. By investigation of photophysical properties of these compounds, it is possible to explain their distinct behavior. Properties are studied in non-polar polymer and OLED host with further device f...

The work describes the in-situ Raman spectroelectrochemical studies on thionine layer covalently bound to the gold surface (Th/Au). The thionine layer was deposited on Au substrate via electrochemical reduction of corresponding diazonium salt. Due to the presence of system of conjugated bonds in the film’s structure, grafted thionine reveals electr...

2,7- and 3,6- substituted carbazole and triphenylamine chalcogenophene (Se, Te) derivatives and their electrodeposited polymers are investigated using electrochemical and UV-Vis-NIR / ESR spectroelectrochemical methods. Major differences in the case of oxidation and electropolymerization behavior between monomers and related polymers are shown. Se...

A three steps synthesis of non-symmetric 1,4-dialkoxybenzenes starting from 4-hydroxybenzaldehydes was described. At first step 4-alkoxyphneols were alkylated to give 4-alkoxybenzaldehydes. At the second step 4-alkoxybenzaldehydes were submitted to a Baeyer-Villiger oxidation with 30% H2O2 to afford 4-alkoxyphenols. At the last step 4-alkoxyphenols...

Here, we show the electrochemical polymerization and characteristic of six p-phenylene derivatives. The electroactive co-monomers and polymers containing furan, thiophene, selenophene units are studied using electrochemical techniques (differential pulse voltammetry, cyclic voltammetry, electrochemical deposition, and voltabsorptiometry) in order t...

During our search for novel conjugated compounds, novel monomers and their polymers with selenophene and tellurophene group were synthesized and characterized. Conjugated poly(p-phenylenevinylenes)s (PPV) derivatives attracted a large attention due to their photolouminescence properties. The stereocontrolled synthesis of 1,4-bis(2-(heteroar-2-yl) e...

The first full characterization of 2,2′-bitellurophene polymerization and the resulting polymer is described. The electrochemical polymerization of 2,2′-bitellurophene (7) and (E,E)-1,4-diethoxy-2,5-bis[2-(tellurophen-2-yl)ethenyl]benzene (1) produces new photoluminescent conjugated polymers. Poly{(E,E)-1,4-diethoxy-2,5-bis[2-(tellurophen-2-yl)ethe...

A stereocontrolled synthesis of a novel selenophene-based monomer namely (E,E)-1,4-dimethoxy- 2,5-bis[2-(selenophen-2-yl)ethenyl]benzene has been successfully performed starting from 1,4- dimethoxybenzene. Its spectra, electrochemistry and polymerization have been studied.

We present the synthesis and selected physicochemical properties of several novel symmetrical and unsymmetrical alpha,omega-nucleobase mono- and bis-amide conjugated systems containing aliphatic, aromatic or saccharidic linkages. The final stage of the synthesis involves condensation of a subunit bearing carboxylic group with an amine subunit. 4-(4...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

A number of aldimines have been obtained in very good yield in reaction of 5-formyl-1,3-dimethyluracil with various substituted anilines in boiling methanol. Selected aldimines were treated with nitrile oxides generated from 4-chlorobenzaldoxime or 4-methylbenzaldoxime forming the appropriate 1,3-cycloadducts in moderate yields.

Complex theoretical and experimental studies and quantum-chemical calculations were applied to study the UV-vis spectroscopic features of the novel compounds: three stereoisomers of 1,4-diethoxy-2,5-bis[2-(5-methylthien-2-yl)ethenyl]benzene (A-C) and E,E isomer of 1,4-diisopropoxy-2,5-bis[2-(thien-2-yl)ethenyl]benzene (D). These structures are the...

A new promising organic chromophore for two-photon laser absorption at 1064 nm with 1,4-diethoxy-2,5-bis[2-(5-methylthien-2-yl)ethenyl]benzene (A-C) was synthesized. We have performed evaluations of the two-photon absorption for these chromophores incorporated into the polymer matrices. Following the obtained quantum chemical data, we have performe...

The group of 1,4-dialkoxy-2,5-bis[2-(thien-2-yl)ethenyl]benzene stereoisomers was synthesized in which methoxy- and ethoxy-groups were used as alkoxy-substituents. These isomers were characterized as solution species both electrochemically and spectroscopically. As expected, these compounds, having a stilben like structure, are the subject of photo...