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    A new low-voltage-driven polymeric electrochromic
    (Elsevier Sci Ltd, 2010) Pamuk, Melek; Tirkes, Seha; Cihaner, Atilla; Algi, Fatih
    Design, synthesis, and properties of a novel donor-acceptor-donor type low-voltage-driven green polymeric electrochrome, P1, which is based on 8-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-11-(2,3-dihydrothieno[3,4-b][l,4]dioxin-7-yl)acenaphtho[1,2-b]quinoxaline (1) are highlighted. It is noted that P1 has an ambipolar (n- and p-doping processes) character in 0.1 M tetrabutylammonium hexafluorophosphate/dichloromethame solution and switches to a transmissive blue state upon oxidation. Furthermore, this new polymeric electrochromic candidate exhibits high redox stability, high coloration efficiency and/or contrast ratio, high percent transmittance (%T) and low response time (1.0 s) with a band gap of 1.10 eV-1.25 eV. (C) 2009 Elsevier Ltd. All rights reserved.
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    A new soluble neutral state black electrochromic copolymer via a donor-acceptor approach
    (Elsevier, 2010) Icli, Merve; Pamuk, Melek; Algi, Fatih; Onal, Ahmet M.; Cihaner, Atilla
    Two donor-acceptor systems, 2-decyl-4,7-bis(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-2H-benzo[d][1,2,3]triazole (1) and 4,7-bis(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-2,1,3-benzoselenadiazole (2) are explored in order to attain a low bandgap black polymer electrochrome, which is highly difficult to attain due to the complexity of designing such materials. Electrochemical polymerization of 1 and 2 in 1:4 monomer feed ratio was performed in a mixture of acetonitrile and dichloromethane solution containing 0.1 M tetrabutylammonium hexafluorophosphate. It was found that electropolymerization provides a processable neutral state black copolymer, (P(1-co-2)), which absorbs virtually the whole visible spectrum (400-800 nm). (P(1-co-2)) is the first low bandgap (1.45 eV) electropolymerized material, which switches from black color (L = 14.3, a = 0.29, b = 0.35) in the neutral state to transmissive grey (L = 39.2, a = 0.29, b = 0.33) in the oxidized state with 15.3% of the transmittance change at 522 nm. Furthermore, it exhibits excellent operational and/or environmental stability under ambient conditions. (c) 2010 Elsevier B.V. All rights reserved.
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    Donor-Acceptor Polymer Electrochromes with Tunable Colors and Performance
    (Amer Chemical Soc, 2010) Icli, Merve; Pamuk, Melek; Algi, Fatih; Onal, Ahmet M.; Cihaner, Atilla
    To demonstrate the effect of donor (D) and acceptor (A) units on the structure property relationships of electrochromic polymers, design, synthesis, characterization and polymerization of a series of D A type systems, 1-5, based on thiophene, 3,4-ethylenedioxythiophene, and 3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine as D units and 2,1,3-benzoselenadiazole, 2,1,3-benzothiadiazole and 2-decyl-2H-benzo[d][1,2,3]triazole as A units are highlighted. It is found that these units play key roles on the redox behavior, band gap, neutral state color, and the electrochromic performance (stability, optical contrast, coloration efficiency, and switching time) of the system. It is noted that electropolymerization of these D-A systems provides processable low band gap electrochromes, P1-P5, exhibiting high redox stability, coloration efficiency, transmittance and/or contrast ratio and low response time. Furthermore, P1-P5 reflect various hues of blue and green pallets of the RGB color-space in the neutral state. In particular, it is noteworthy that P5 is an excellent blue-to-colorless polymeric electrochrome, which, to our best knowledge, exhibits the highest optical contrast and coloration efficiency among the D A type systems. The panoramic breadth of the neutral state colors and intriguing features of these polymeric materials further confirm that D A approach allows engineering tunable electrochromes, which hold promise for commercialization of polymeric ROB electrochromics.
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    Incorporation of a 2,3-dihydro-1H-pyrrolo[3,4-d]pyridazine-1,4(6H)-dione unit into a donor-acceptor triad: synthesis and ion recognition features
    (Pergamon-Elsevier Science Ltd, 2012) Pamuk, Melek; Algi, Fatih
    A novel directly-linked donor-acceptor-donor (D-A-D) type system, which is based on 2,3-dihydro-1H-pyrrolo[3,4-d]pyridazine-1,4(6H)-dione as the A unit and thiophene as the D units, respectively, is designed, synthesized, and characterized by spectroscopic methods. This novel D-A-D system can be used for the fluorogenic detection of Cu2+ among other ions. (C) 2012 Elsevier Ltd. All rights reserved.
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    İşlenebilir lüminesans ve redoks aktif yeni bir bileşik grubunun tasarımı sentezi özellikleri ve uygulamaları
    (2011) Algı, Fatih; Pamuk, Melek; Cihaner, Atilla; Karagöz, Buse; Sarıtaş, Cenk
    [Abstract Not Available]
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    Nonreaction-based fluorescent Au3+ probe that gives fast response in aqueous solution
    (Pergamon-Elsevier Science Ltd, 2013) Oztas, Zahide; Pamuk, Melek; Algi, Fatih
    The design and synthesis of a simple, selective and efficient tum-off fluorescent Au3+ probe, namely, diethyl 1-phenyl-2,5-di(thiophen-2-yl)-1H-pyrrole-3,4-dicarboxylate (1), are highlighted. To our best knowledge, this is the first example of nonreaction-based fluorescent Au3+ probes. (c) 2012 Elsevier Ltd. All rights reserved.
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    Synthesis of a novel on/off fluorescent cadmium(II) probe
    (Pergamon-Elsevier Science Ltd, 2012) Pamuk, Melek; Algi, Fatih
    A novel on/off fluorescent Cd2+ probe, which is based on a 1,10-phenanthroline scaffold with cofacial BODIPY units attached orthogonally as the receptor and fluorophore units, respectively, is described. The digital action of a two-input NOR logic gate is also demonstrated. (C) 2012 Elsevier Ltd. All rights reserved.
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    Yeni bis-azo boyarmaddelerin sentezi ve yapılarının spektroskopik yöntemlerle incelenmesi
    (Çanakkale Onsekiz Mart Üniversitesi, 2008) Pamuk, Melek; Aydın, Fatma
    Bu çalışmada, -O-, -CH2-, -SO2- gruplarının bağladığı 4,4'-diaminodifenil iskeleti içeren bileşiklerden oluşturulan bis diazonyum tuzları hazırlandı ve ß-hidroksi naftalin, o-hidroksibenzaldehit, o,p-dihidroksibenzaldehit ile kenetlenerek yeni bis-azo bileşikleri sentezlendi. Sentezlenen bileşikler;Bis[4,4'-(2''-hidroksi-naftilazo)]-difenil eter,Bis[4,4'-(4''-hidroksi-3''-formil-fenilazo)]-difenil eter,Bis[4,4'-(2'', 4''-dihidroksi-3''-formil-fenilazo)]-difenil eter,Bis[4,4'-(2''-hidroksi-naftilazo)]-difenil sülfon,Bis[4,4'-(4''-hidroksi-3''-formil-fenilazo)]-difenil sülfon,Bis[4,4'-(2'', 4''-dihidroksi-3''-formil-fenilazo)]-difenil sülfon,Bis[4,4'-(2''-hidroksi-naftilazo)]-difenil metan,Bis[4,4'-(4''-hidroksi-3''-formil-fenilazo)]-difenil metan,Bis[4,4'-(2'', 4''-dihidroksi-3''-formil-fenilazo)]-difenil metan.Bileşiklerin yapıları FT-IR, 1H-NMR, 13C-NMR spektrumları yardımıyla kanıtlandı.Ayrıca, sentezlenen bileşiklerin UV-vis absorpsiyon spektrumu fonksiyonel gruplara ve kullanılan çözücülerin polaritesine bağlı olarak meydana gelen değişimler incelendi. Fonksiyonel grup ve çözücü polaritesi farkı ile maksimum soğurumlar arasındaki ilişkiler belirlenmeye çalışıldı. Asidik ve bazik ortamdaki renk değişimleri incelenerek asit-baz indikatörü olasılığı belirlenmeye çalışıldı.