نتایج جستجو برای: cationic aromatic dye

تعداد نتایج: 100181  

Journal: :Ecological Engineering & Environmental Technology 2021

Journal: :Angewandte Chemie 2021

Cationic BN-embedded polycyclic aromatic hydrocarbons (BN-PAH+s) were synthesized from a nitrogen-containing macrocycle via pyridine-directed tandem C?H borylation. Incorporating BN into PAH+ resulted in remarkable hypsochromic shift due to an increase the LUMO energy and symmetry changes of HOMO LUMO. Electrophilic substitution or anion exchange BN-PAH+ possessing tetrabromoborate as counter (...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده فنی 1393

در این مطالعه نانوالیاف pva/dye در غلظت های مختلف با موفقیت آماده و به عنوان لایه حساس کننده در سلول های خورشیدی استفاده شد. نانوالیاف به دست آمده با روش تحلیلی مانندftir ، طیف سنجی uv-visو sem مورد بررسی قرار گرفت. تجزیه و تحلیل ساختاری وجود رنگزا در نانوالیاف pva/dye الکتروریسی شده را تایید کرد. باتوجه به نتایج جذب uv-vis راندمان تبدیل بالاتر برای نانولایه ی pva/dye که در غلظت 15? از محلول پل...

2013
Ana M Sanjuán Alberto Martínez Patricia García-García Manuel A Fernández-Rodríguez Roberto Sanz

The cyclization of o-(alkynyl)-3-(methylbut-2-enyl)benzenes, 1,6-enynes having a condensed aromatic ring at C3-C4 positions, has been studied under the catalysis of cationic gold(I) complexes. The selective 6-endo-dig mode of cyclization observed for the 7-substituted substrates in the presence of water or methanol giving rise to hydroxy(methoxy)-functionalized dihydronaphthalene derivatives is...

Journal: :Environmental science & technology 2004
P Pandit S Basu

Several methods (e.g., UV/H2O2 oxidation, adsorption, flocculation-precipitation) are normally employed to remove dye from water. A new technique based on liquid/liquid extraction using reverse micelles is proposed whereby recovery of solvent and reuse of dye is possible. Experiments were conducted by mixing a known quantity of dye in aqueous phase and solvent-containing surfactants in a simple...

Journal: :Molecules 2012
Milica Milenković Beata Warżajtis Urszula Rychlewska Dušanka Radanović Katarina Anđelković Tatjana Božić Miroslava Vujčić Dušan Sladić

The facile preparation of a racemic hydrazine bridged diphosphonium compound possessing a ring system analogous to bicyclo[3.3.2]decane is reported. Although the reaction yield is low, the structure of the compound, which possesses an eight-membered ring, two phosphonium cationic centers, a biimino bridge, molecular chirality and two fused aromatic rings locked into roughly perpendicular planes...

Journal: :Journal of photochemistry and photobiology. B, Biology 1997
D A Fernández J Awruch L E Dicelio

The synthesis of tetrakis (1,1-dimethyl-2-trimethylammonium)ethylphthalocyaninato Zn(II) tetraiodide 2--a new cationic phthalocyanine--is reported as well as its photophysical properties in water, relevant for the use of this dye as photodynamic sensitizer. The hydrophobicity of the macrocycle leads to strong aggregation which lowers the fluorescence and singlet oxygen quantum yields of aqueous...

Journal: :The Biochemical journal 1978
G P Diakun H E Edwards J C Allen G O Phillips

The fluorescence technique described here utilizes the electrostatic interaction between the polyanionic sites of glycosaminoglycans and the cationic dye Acridine Orange to analyse urinary glycosaminoglycans from patients suffering from mucopolysaccharidoses. The basis of the titration is the decrease in the fluorescence of free Acridine Orange that occurs when it is bound to polyanions. The ef...

Journal: :Dalton transactions 2012
Dipankar Saha Giridhar Madras Tayur N Guru Row

A facile method of solution combustion was used to synthesize a new solid solution Bi(2)Ce(2)O(7). The structure was determined from powder X-ray diffraction (PXRD) and found to crystallize in the space group Fm3m with cell parameter a = 5.46936(9) Å. The particle sizes varied from 5 to 6 nm. The degradation of cationic dye malachite green (MG) was investigated under solar radiation as the band...

Journal: :Dalton transactions 2015
Sha Ou Jun-Ping Zheng Guo-Qiang Kong Chuan-De Wu

Zwitterions and polyoxometalates (POMs) are two kinds of functional moieties with very different properties for applications in different fields. We have developed an effective strategy to successfully immobilize these two different moieties into the frameworks of porous hybrid materials, in which the POM units act as templates and photoactive moieties. These hybrid materials demonstrate remark...

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