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Öğe Fluorescence properties and electrochemical behavior of some schiff bases derived from n-aminopyrimidine(Springer Nature, 2014-03) Gülcan, Mehmet; Doğrul, Ümit; Öztürk Ürüt, Gülsiye; Levent, Abdulkadir; Akbaş, EsvetA series of Schiff bases (L 1, L 2 and L 3 ) were prepared by refluxing aromatic aldehydes with N-Aminopyrimidine derivatives in methanol and ethanol. The structures of synthesized compounds were characterized by FTIR, 1H NMR, 13C NMR and microanalysis. The electrochemical behaviors of the Schiff base ligands were also discussed. Moreover, the evaluation of absorption and emission properties of the structures were carried out in five different solvents. The products show visible absorption maxima in the range of 304-576 nm, and emission maxima from 636 to 736 nm in all solvents tested.Öğe Synthesis, characterization and antioxidant activity of heterocyclic Schiff bases(Journal of the Chinese Chemical Society, 2020-08-04) Aral, Tarık; Dağ, Beşir; Kızılkaya, Hakan; Genç, Nusret; Erenler, RamazanSchiff base derivatives have gained great importance due to revealing a great number of biological properties. Schiff bases were synthesized by treatment of 4-amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one (1) with various aldehydes in methanol at reflux. In addition, diamine was reacted with an aldehyde to yield the corresponding Schiff bases. The structures of synthesized Schiff bases were elucidated by spectroscopic methods such as microanalysis, 1 H-NMR, 13C-NMR, and FTIR. Antioxidant activities of synthesized Schiff bases were carried out using different antioxidant assays such as 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH• ) scavenging, 2,20 -azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging, and reducing power activity. (E)-4-((1H-indol-3-yl)methyleneamino)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one (3), (E)-1,5-dimethyl-4-((2-methyl-1H-indol-3-yl) methyleneamino)-2-phenyl-1H-pyrazol-3(2H)-one (5), (E)-1,5-dimethyl-2-phenyl-4-(thiophen-2-ylmethyleneamino)-1H-pyrazol-3(2H)-one (7), (E)-1,5-dimethyl2-phenyl-4-(quinolin-2-ylmethyleneamino)-1H-pyrazol-3(2H)-one (9), (1S,2S, N1,N2)-N1,N2-bis((1H-indol-3-yl)methylene)cyclohexane-1,2-diamine (11), and (1S,2S,N1,N2)-N1,N2-bis((2-methyl-1H-indol-3-yl)methylene)cyclohexane-1,2-diamine (12) were synthesized in high yields. Compound 5 displayed a good ABTS•+ activity. Compound 3 revealed the outstanding activity in all assays. Compound 7 has the best-reducing power ability in comparison to other synthesized compounds. Although compounds 5, 11, 12 are new, compounds 3, 7, 9 are known. Due to revealing a good antioxidant activity, the synthesized compounds (3, 5, 7) have the potential to be used as synthetic antioxidant agents.Öğe 4-aminoantipirin türevi heterohalkalı yeni schiff bazlarının sentezi, karekterizasyonu ve antioksidan aktiviteleri(Batman Üniversitesi Fen Bilimleri Enstitüsü, 2019-08-26) Kızılkaya, Hakan; Dağ, BeşirBu çalışmada, üç tanesi yeni olmak üzere beş adet Schiff bazı sentezlendi. 4-(2-Piridilmetilen)amino-1-fenil-2,3-dimetil-5-pirazol-on (1) ve (4Z)-4-((tiofen-2-il)metilenamino)-1,2-dihidro-2,3-dimetil-1-fenilpirazol-5-on (3), daha önce de sentezlenmiş olup, (E)-1,5-dimetil-4-((2-metil-1H-indol-3-il)metilenamino)-2-fenil-1H-pirazol-3(2H)-on (2), (4E)-4-((1H-indol-3-il)metilenamino)-1,2-dihidro-2,3-dimetil-1-fenilpirazol-5-on (4) ve (E)-1,5-dimetil-2-fenil-4-(kinolin-2-il-metilenamino)-1H-pirazol-3(2H)-on (5) ise ilk kez sentezlendi. Sentezlenen bu Schiff bazlarının yapıları 1H NMR, 13C NMR ve FTIR ile aydınlatıldı. Sentezlenen bileşiklerin antioksidan aktiviteleri incelendi ve ABTS+• (2,2'-azino-bis(3-etilbenzotiyazolin-6-sülfonik asit)diamonyum katyonu) radikal katyonu giderme aktivitesi, DPPH• (1,1-difenil-2-pikrilhidrazil) radikal giderme aktivitesi ve indirgenme gücü aktivitesi yöntemleri kullanıldı. Trolox, BHT ve BHA standart olarak kullanıldı. Bileşik 1’in en yüksek antioksidan aktivite gösterdiği gözlendi.Öğe Synthesis and anticorrosion studies of 4-[(2-nitroacetophenonylidene)-amino]-antipyrine on SAE 1012 carbon steel in 15 wt.% HCl solution(Taylor & Francis, 2020-11-16) Gerengi, Hüsnü; Çakmak, Reşit; Dağ, Beşir; Solomon, M. M; Tüysüz Akbal, Hatice Aslıhan; Kaya, ErtuğrulA novel corrosion inhibitor, ((E)-1,5-dimethyl-4-((1-(3-nitrophenyl)ethylidene)amino)-2-phenyl-1,2-dihydro-3H-pyrazol-3-one) (DNPP) was synthesized in high yield by the condensation reaction of 4-aminoantipyrine with 2-nitroacetphenone derived from acetophenone as a starting material and characterized by FT-IR, 1H, and 13C NMR techniques. DNPP was tested against the corrosion of SAE 1012 carbon steel in 15 wt.% HCl solution using electrochemical and surface characterization techniques. Results obtained show that DNPP is effective in retarding the corrosion of SAE 1012 carbon steel. With 4 mM of DNPP, the charge transfer resistance of SAE 1012 in 15 wt.% HCl solution is raised from 17.42 to 140.50 Ω cm2 and the substrate surface is protected by 87%. The inhibition is through adsorption mechanism (mixed-adsorption type) and has been confirmed by SEM and EDAX results. Potentiodynamic polarization results reveal that DNPP acted as a mixed-type corrosion inhibitor. DNPP is a promising candidate for the formulation of an inhibitor cocktail for the strong acid environment.Öğe 4-aminoantipirin türevi heterohalkalı schıff bazlarının sentezi, karekterizasyonu ve antioksidan aktiviteleri(Batman Üniversitesi Fen Bilimleri Enstitüsü, 2019-08-26) Kızılkaya, Hakan; Dağ, BeşirBu çalışmada, 4-aminoantipin türevi beş adet Schiff bazı sentezlendi: 4-(2-Piridilmetilen)amino-1-fenil-2,3-dimetil-5-pirazol-on (1), (E)-1,5-dimetil-4-((2-metil-1H-indol-3-il)metilenamino)-2-fenil-1H-pirazol-3(2H)-on (2), (4Z)-4-((tiofen-2-il)metilenamino)-1,2-dihidro-2,3-dimetil-1-fenilpirazol-5-on (3), (4E)-4-((1H-indol-3-il)metilenamino)-1,2-dihidro-2,3-dimetil-1-fenilpirazol-5-on (4) ve (E)-1,5-dimetil-2-fenil-4-(kinolin-2-il-metilenamino)-1H-pirazol-3(2H)-on (5). Sentezlenen bu Schiff bazlarının yapıları 1H NMR, 13C NMR ve FTIR ile aydınlatıldı. Sentezlenen bileşiklerin antioksidan aktiviteleri incelendi ve ABTS+• (2,2'-azino-bis(3-etilbenzotiyazolin-6-sülfonik asit)diamonyum katyonu) radikal katyonu giderme aktivitesi, DPPH• (1,1-difenil-2-pikrilhidrazil) radikal giderme aktivitesi ve indirgenme gücü aktivitesi yöntemleri kullanıldı. Trolox, BHT ve BHA standart olarak kullanıldı. Bileşik 1'in en yüksek antioksidan aktivite gösterdiği gözlendi.
