706 research outputs found
A Processable Rainbow Mimic Fluorescent Polymer and Its Unprecedented Coloration Efficiency in Electrochromic Device
No full textAlgi, Fatih/0000-0001-9376-1770A processable rainbow mimic fluorescent polymer (PSNSF) based on 1-(9H-fluoren-2-yl)-2,5-di(thiophen-2-yl)-1H-pyrrole (SNSF) was synthesized via electrochemical polymerization in a mixture of ethanol and CH2Cl2 solution containing 0.1 M LiClO4. Characterization was carried out using cyclic voltammetry, UV-vis and F-FAR spectroscopic techniques. Also, an electrochromic device based on PSNSF was studied, which exhibits high coloration efficiency (CE), high redox stability (retaining 98.6% of its optical activity after 4000th switch) and very low response time (less than 0.5 s). (c) 2007 Elsevier Ltd. All rights reserved
Synthesis, chemiluminescence and energy transfer efficiency of 2,3-dihydrophthalazine-1,4-dione and BODIPY dyad
No full textWOS: 000395212100013The design, synthesis and energy transfer efficiency of a new covalently linked molecular dyad 5, which consists of 2,3-dihydrophthalazine-1,4-dione and BODIPY scaffolds, are reported. It is noteworthy that dyad 5 can induce chemiluminescence upon treatment with alkaline H2O2 in the presence of Fe(III) ions. This reaction triggers chemiluminescence resonance energy transfer (CRET) from 2,3-dihydrophthalazine-1,4-dione unit to BODIPY fluorophore, which act as the donor and the acceptor components, respectively. To our best knowledge, this is the first example of a covalently linked molecular dyad consisting of chemiluminogenic 2,3-dihydrophthalazine-1,4-dione and BODIPY dye. Importantly, dyad 5 can provide a low energy emitting material via the chemiluminescence energy transfer (CRET), which covers almost the entire visible region (400 nm-700 nm) of the electromagnetic spectrum. (C) 2017 Elsevier Ltd. All rights reserved.Turkish Academy of Sciences (TUBA) Young Investigator Award Programme (GEBIP); Aksaray University; Scientific and Technological Research Council of Turkey (TUBITAK)We are grateful to Turkish Academy of Sciences (TUBA) Young Investigator Award Programme (GEBIP) and Aksaray University for partial financial support of our projects. A. D. is indebted to Scientific and Technological Research Council of Turkey (TUBITAK) for a graduate fellowship
Synthesis, Properties, and Electrochemistry of a Photochromic Compound Based on Dithienylethene and Prodot
No full textAlgi, Fatih/0000-0001-9376-1770; ALGI, MELEK PAMUK/0000-0001-5863-3976;The synthesis, photochromic features, and electrochemistry of a novel material based on dithienylethene (DTE) and 3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine (didecyl-ProDOT) units are described. It is noteworthy that 1,2-bis (5-(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-2-methylthiophen-3-yl)cyclopent-1-ene can be efficiently switched between open and closed states by light in both solution and in the solid poly(methyl metacrylate) (PMMA) matrix. It is also found that the emission of this novel compound can be switched on and off upon irradiation.Scientific and Technological Research Council of Turkey (TUBITAK) [110T871]; TUBA; Atilim University [ATU-ALP-1011-02]; Turkish Academy of Sciences (TUBA)F. A. is indebted to the National Young Researchers Career Development Program (3501 CAREER) of the Scientific and Technological Research Council of Turkey (TUBITAK Grant No. 110T871) for financial support. Atilim University (ATU-ALP-1011-02) and the Turkish Academy of Sciences (TUBA) are also gratefully acknowledged. M. P. A. thanks TUBA for the graduate fellowship
The Synthesis, Characterization and Energy Transfer Efficiency of a Dithienylpyrrole and Bodipy Based Donor-Acceptor System
No full textAlgi, Fatih/0000-0001-9376-1770;A dithienylpyrrole-BODIPY based donor-acceptor system with 1,4-phenylene spacer as a model system for energy transfer was designed and synthesized. Absorption and emission spectra have revealed an efficient resonance energy transfer from dithienylpyrrole as donor to BODIPY as acceptor.Scientific and Research Council of Turkey [107T883]; [COMU-BAP/2008-36]We gratefully acknowledge financial support from the Scientific and Research Council of Turkey (TUBITAK, Grant No: 107T883) and university funding (COMU-BAP/2008-36)
Design, Synthesis, Photochromism and Electrochemistry of a Novel Material With Pendant Photochromic Units
No full textALGI, MELEK PAMUK/0000-0001-5863-3976; Algi, Fatih/0000-0001-9376-1770;In the present work, the synthesis, photochromism and electrochemistry of a novel material 1, 1-(4-[3,4-bis(2,5-dimethyl-3-thienyl)cyclopent-3-en-1-yl]phenyl)-2,5-di-2-thienyl-1H-pyrrole, with pendant dithienylethene (DTE) photochromic units are described. It should be noted that the system I can be reversibly and efficiently switched between open (1o) and closed (1c) states by light in both solution and in the solid poly(methyl methacrylate) matrix. It is also noteworthy that the two isomers (1o and 1c) of this novel system 1 can be smoothly polymerized on ITO by electrochemical means. Surprisingly, the DTE unit in I does not retain its photochemical switching properties after immobilization onto ITO. The morphology of the polymer film was investigated by AFM analysis. Furthermore, it was found that the polymer exhibited remarkable electrochromic features that can be switched from green in the neutral state to violet state under applied external potentials without disturbing the photochromic units. (C) 2014 Elsevier Ltd. All rights reserved.National Young Researchers Career Development Program (3501 CAREER) of the Scientific and Technological Research Council of Turkey (TUBITAK) [110T871]; Turkish Academy of Sciences (TUBA); TUBAF.A. is indebted to National Young Researchers Career Development Program (3501 CAREER) of the Scientific and Technological Research Council of Turkey (TUBITAK Grant No. 110T871) for financial support. Atilim University (ATU-ALP-1011-02) and Turkish Academy of Sciences (TUBA) are also gratefully acknowledged. M.P.A. thanks TUBA for graduate fellowship
Electrochemical and Optical Properties of an Azo Dye Based Conducting Copolymer
No full textAlgi, Fatih/0000-0001-9376-1770;The electrochemical and optical properties of a novel conducting copolymer called poly(2,5'-dimethyl-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)-phenyl]azobenzene-co-(3,4-ethylenedioxythiophene)) (poly(1-co-EDOT)) are reported. Electrochemically synthesized poly(1-co-EDOT) based on the azo dye has a well-defined and reversible redox couple (0.37 V vs. Ag/AgCl) with good cycle stability. The copolymer film exhibits high conductivity (13 S/cm) as well as electrochromic behavior (magenta when neutralized and transmissive sky blue when oxidized). Furthermore, electro-optically active copolymer film has a low band gap of 1.79 eV with a pi-pi* transition at 555 nm.Scientific and Technological Research Council of Turkey (TUBITAK) [108T980]We thank the Scientific and Technological Research Council of Turkey (TUBITAK, Grant No: 108T980) for its financial support of this work
A Novel Neutral State Green Polymeric Electrochromic With Superior N- and P-Doping Processes: Closer To Red-Blue (rgb) Display Realization
No full textAlgi, Fatih/0000-0001-9376-1770Two donor-acceptor systems, 4,7-di-2-thienyl-2,1,3-benzoselenadiazole (TSeT) and 4,7-di-2,3-dehydrothieno[3,4-b][1,4]dioxin-5yl-2,1,3-benzoselenadiazole (ESeE) are synthesized and electropolymerized to give polymers PTSeT and PESeE, respectively. One of the polymers, PTSeT, is blue-green in the neutral state and soluble, exhibiting a deep-red emission color. The other, PESeE, is the first 2,1,3-benzoselenadiazole-based neutral state green polymer with a narrow bandgap (1.04eV). Furthermore, PESeE has superior and durable n- and p-doping processes. Beyond the stability and the robustness, both of the polymer films exhibit multi-electrochromic behavior.Scientific and Technical Research Council of Turkey (TUBITAK)We gratefully acknowledge financial support from the Scientific and Technical Research Council of Turkey (TUBITAK)
An ambipolar neutral state green polymeric electrochromic
No full textAlgi, Fatih/0000-0001-9376-1770;The synthesis and properties of highly stable neutral state green polymeric electrochromic, P1, which is based on 5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2,3-di(1H-pyrrol-2-yl)quinoxaline were highlighted. P1 exhibits three well-defined absorption bands with a narrow band gap (1.17 eV). The n- and p-doping (ambipolar) processes suggest that P1 is one of the most promising neutral state green polymers and it can be used in supercapacitors as either cathode or anode electrode material. Apart from the stability and the robustness of the polymer film, P1 shows multi-electrochromic behavior; gray-purple in the reduced form and highly transmissive blue color in the oxidized state. (C) 2009 Elsevier B.V. All rights reserved.Scientific and Technical Research Council of Turkey (TUBITAK)We gratefully acknowledge the financial support from the Scientific and Technical Research Council of Turkey (TUBITAK)
An Ambipolar Low Band Gap Material Based on Bodipy and Edot
No full textAlgi, Fatih/0000-0001-9376-1770;A novel donor-acceptor type conducting polymer based on BODIPY dye as acceptor and EDOT units as donor parts is synthesized electrochemically. The unique combination of BODIPY and EDOT units provides an ambipolar (n- and p-doping processes) low band gap material (4). This is the first example of p-n junction in an organic pi-conjugated material where BODIPY unit is incorporated directly in the main chain. Furthermore, the polymer film exhibits electrochromic behavior upon p-doping: a color change from light violet (neutral) to indigo (oxidized). (C) 2009 Elsevier B.V. All rights reserved.Scientific and Technical Research Council of Turkey (TUBITAK)We gratefully acknowledge the financial support from the Scientific and Technical Research Council of Turkey (TUBITAK)
Electrochemical and Optical Properties of New Soluble Dithienylpyrroles Based on Azo Dyes
No full textAlgi, Fatih/0000-0001-9376-1770Two dithienylpyrroles based on azo dyes, namely 2,5'-dimethyl-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)-phenyl]azobenzene (SNS-AB2) and 2,5'- dimethyloxy-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)phenyl]azobenzene (SNS-AB3), were synthesized and their corresponding polymers (PSNS-AB2 and PSNS-AB3) were successfully obtained via electropolymerization. The monomers have lower oxidation potentials (0.75 V and 0.80V vs. Ag/AgCl for SNS-AB2 and SNS-AB3, respectively) when compared to their analogous. Both monomers exhibited photoisomerism properties under irradiation at 360 nm. During the irradiation process, for example, the color of SNS-AB3 changes from yellow to greenish yellow. The electroactive polymer films have well defined and reversible redox couples with a good cycle stability in both aqueous and organic solutions. The polymer films also exhibited electrochromic behaviors; color changes from yellowish green to dark green for the PSNS-AB2 (lambda(max) = 435 nm and E-g = 2.31 eV) and from mustard color to green for PSNS-AB3 (lambda(max) = 430nm and E-g = 2.34 eV). Furthermore, the soluble polymers demonstrated different hues of yellow and green colors. (C) 2008 Elsevier Ltd. All rights reserved.Scientific and Technical Research Council of Turkey (TUBITAK)Authors express their gratitude to the Scientific and Technical Research Council of Turkey (TUBITAK) for financial support
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