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Stę,pniowski, Wojciech J.,Yoo, Hyeonseok,Choi, Jinsub,Norek, Małgorzata,Jó,x17a,wik, Paweł,Misiolek, Wojciech Z. Elsevier 2019 THIN SOLID FILMS - Vol.671 No.-
<P><B>Abstract</B></P> <P>Electropolished copper foil was passivated in aqueous solution of 1.0 M NaOH at negative potential range vs. silver chloride electrode at room temperature. The passivations were performed at −50, −100, −150, and −200 mV for 1, 5 or 15 h. The resulting nano-needle layers were characterized by X-ray photoelectron spectroscopy and band gaps derived from UV–Vis spectroscopy evidencing coincidence of Cu(OH)<SUB>2</SUB>, CuO and Cu<SUB>2</SUB>O phases. Scanning Electron Microscopy revealed that the diameter of nanoneedles was not influenced by the passivation potential, however, the nanoneedles diameter was decreasing with extension of the passivation time (the smallest diameter obtained was 60 ± 17 nm). Additionally, the as-prepared oxide nano-needles were found to be polycrystalline, without any post treatments. All together, chemical compositionand physical properties (band gap) show that the inner part of the grown nano-needles is rather made of Cu<SUB>2</SUB>O, while outer part, there where the passivation reaction takes place, is made of CuO and Cu(OH)<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper was passivated in NaOH. </LI> <LI> Formed oxide was crystalline and made of nanoneedles. </LI> <LI> X-ray Photoelectron Spectroscopy shows presence of Cu<SUB>2</SUB>O, CuO and Cu(OH)<SUB>2.</SUB> </LI> <LI> Optical bandgap was found to be ca. 2.2 (Cu<SUB>2</SUB>O) and 1.4 eV (CuO). </LI> </UL> </P>
Stę,pniowski, Wojciech J.,Choi, Jinsub,Yoo, Hyeonseok,Michalska-Domax144,ska, Marta,Chilimoniuk, Paulina,Czujko, Tomasz North-Holland 2016 Materials letters Vol.164 No.-
<P><B>Abstract</B></P> <P>FeAl intermetallic alloy was anodized in 20wt% sulfuric acid at 0°C for 1min at the voltage ranging from 5 to 20V with a step of 2.5V. Based on the FE-SEM images, fast Fourier transformed (2D-FFT) quantitative arrangement analysis of the porous oxide was performed for the oxide formed after the first and the second step of anodization. It was found that for voltages below 15V FFT-derived regularity ratio values for both steps are comparable. For 15V and greater voltages regularity ratio of the obtained anodic oxide is much better while a two-step procedure is employed. Conducted research revealed that two-step self-organized anodization improves regularity of the porous oxide formed on FeAl intermetallic alloy. Moreover, regularity ratio increases rapidly with the anodizing voltage for the second step of anodization.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FeAl intermetallic alloy was anodized in sulfuric acid. </LI> <LI> Porous oxide was obtained. </LI> <LI> Fast Fourier Transform based arrangement analysis was done. </LI> <LI> Since 15V, two-step anodizing improves arrangement. </LI> <LI> The greater voltage the better final arrangement of the pores. </LI> </UL> </P>
Synthesis and Photophysical Properties of Hexaphenylbenzene-Pyrrolo[3,2-b]pyrroles
Stę,x17c,ycki, Rafał,Reger, David,Hoelzel, Helen,Jux, Norbert,Gryko, Daniel Georg 2018 Synlett Vol. No.
<P>Methods for the synthesis of pyrrolo[3,2-b]pyrroles containing hexaphenylbenzene moieties at the 2- and 5-positions or the 1- and 4-positions have been developed. It was shown that placing a hexaphenylbenzene moiety at the 2- and 5-positions requires a Diels-Alder reaction between an alkyne-substituted pyrrolopyrrole core and a 2,3,4,5-tetraphenylcyclopenta-2,4-dien-1-one. The resulting dyes show a strong blue fluorescence that was hypsochromically shifted by chlorination at the 3- and 6-positions. The overall conjugation between the hexaphenylbenzene moieties and the pyrrolopyrrole core is limited, as evident from their photophysical properties. The hexaphenylbenzene moieties attached to the pyrrolo[3,2-b]pyrrole core could not be transformed into hexa-peri-hexabenzocoronenes through intramolecular oxidative aromatic coupling.</P>
Sung, Young Mo,Szyszko, Bartosz,Myx15b,liborski, Radomir,Stę,piex144,, Marcin,Oh, Juwon,Son, Minjung,Latos-Grax17c,yx144,ski, Lechosław,Kim, Dongho The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.61
<P>In a series of thiaaceneporphyrinoids, their conformers exhibit macrocyclic π-conjugation pathways controlled by a dihedral angle between the porphyrin framework and acene planes. Conformational equilibria significantly affect the photophysical properties of these macrocycles.</P> <P>Graphic Abstract</P><P>In a series of thiaaceneporphyrinoids, their conformers exhibit macrocyclic π-conjugation pathways controlled by a dihedral angle between the porphyrin framework and acene planes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc03855j'> </P>
Majewski, Marcin A.,Chmielewski, Piotr J.,Chien, Alan,Hong, Yongseok,Lis, Tadeusz,Witwicki, Maciej,Kim, Dongho,Zimmerman, Paul M.,Stę,piex144,, Marcin Royal Society of Chemistry 2019 Chemical science Vol.10 No.11
<▼1><P>A diindenophenanthrene biradicaloid, formally derived from Chichibabin's hydrocarbon, is obtained in a short, scalable synthesis.</P></▼1><▼2><P>A diindenophenanthrene biradicaloid, formally derived from Chichibabin's hydrocarbon, is obtained in a short, scalable synthesis. The present system is electron-rich and devoid of conjugated substituents, and still exhibits very good stability under ambient conditions. The introduction of the diindeno[1,2-<I>a</I>:2′,1′-<I>i</I>] phenanthrene ring framework results in a singlet biradicaloid system with an easily accessible triplet state (Δ<I>E</I><SUB>S–T</SUB> = –1.30 kcal mol<SUP>–1</SUP>) and a small electronic bandgap (1.39 V). The stability limits of the title hydrocarbon were explored systematically in the solid state, to reveal an unusual thermally initiated hydrogen-scrambling oligomerization process.</P></▼2>