A5029231635- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Photochromic and Fluorescence Chemistry
- Luminescence and Fluorescent Materials
- Free Radicals and Antioxidants
- Synthesis of Organic Compounds
- Protein Interaction Studies and Fluorescence Analysis
- Mesoporous Materials and Catalysis
- Molecular Sensors and Ion Detection
- Dyeing and Modifying Textile Fibers
- Sulfur-Based Synthesis Techniques
- Synthesis and Characterization of Heterocyclic Compounds
- Skin Protection and Aging
- Liquid Crystal Research Advancements
- Photopolymerization techniques and applications
- Science and Education Research
- Lanthanide and Transition Metal Complexes
- Cultural Heritage Materials Analysis
- Analytical Chemistry and Sensors
- Spectroscopy and Quantum Chemical Studies
- Nonlinear Optical Materials Research
- Nonlinear Optical Materials Studies
- Polyoxometalates: Synthesis and Applications
- Environmental Sustainability and Education
- Aerogels and thermal insulation
Universidade Federal do Rio Grande do Sul
2016-2025
Institut Charles Gerhardt Montpellier
2008-2010
Institut de Chimie
2008-2010
University of Castilla-La Mancha
2010
Laboratoire de Chimie Moléculaire
2008-2010
Instituto de Química Física Blas Cabrera
2005
New cyanines were prepared by an efficient and practical route with satisfactory overall yield from low-cost starting materials. The photophysical behavior of the was investigated using UV-vis steady-state fluorescence in solution, as well their association bovine serum albumin (BSA) phosphate buffer solution (PBS). No cyanine aggregation observed organic solvents or solution. alkyl chain length quaternized nitrogen shown to be fundamental for BSA detection PBS these dyes.
ABSTRACT The widespread use of electronic devices has led to increased blue light exposure, highlighting the need for effective radiation blockers with protection. Two synthetic 2‐(2′‐hydroxyphenyl)benzoxazole derivatives named azo‐4′‐benzoxazole and azo‐5′‐benzoxazole have shown an unprecedented absorption capacity but had not been subjected a safety evaluation. This study aimed evaluate cytotoxic, genotoxic, mutagenic activities these compounds. cytotoxic genotoxic were evaluated using MTT...
We report on the synthesis and photophysical lasing properties of two new dipyrromethene·BF2 dyes, analogues commercial dye PM567, dissolved in liquid solutions or polymeric matrices poly(methyl methacrylate) as solid copolymers with methyl methacrylate, where chromophore is covalently bound to chains. The dyes have 8 position substituted by group p-(acetoxypolymethylene)phenyl p-(methacryloyloxypolymethylene)phenyl (number methylenes = 1 3). Good correlations between dilute characteristics...
Five silyl-functionalized benzazole dyes, fluorescent by excited state intramolecular proton transfer (ESIPT) mechanism, were synthesized reaction of amino derivatives with 3-(triethoxysilyl)propyl isocyanate. Fluorescent silica gels prepared and monolithic aerogels (d ≈ 0.18 g cm−3) obtained via supercritical CO2 drying the gel. The photophysical behaviour dyes was investigated UV–vis steady-state fluorescence spectroscopy.
New fluorescent succinimidyl benzazole derivatives were synthesised and successfully used to stain Candida albicans ATCC 10231 cells. The dyes characterised by means of infrared, 13C 1H NMR spectroscopies elemental analysis. UV–Vis steady-state fluorescence in solution also applied characterise their photophysical behaviour. novel the yellow–green region a phototautomerism excited state (ESIPT) with large Stokes shift (9065–10962 cm−1). Dual could be observed depending on solvent polarity....
2-[5′-N-(3-triethoxysilyl)propylurea-2′-hydroxyphenyl]-benzothiazole (HBTNH2) was covalently bonded to the inner surface of amorphous silica nanoparticles and unmodified Al-doped mesoporous structured silicate, MCM-41 (Al)MCM-41, respectively. The photodynamics these materials investigated using steady-state femtosecond fluorescence up-conversion techniques. guest molecule shows emission dependence on excitation wavelength. Covalently bonding HBTNH2 affects both spectral dynamical behavior...
Abstract Six new fluorescent monomers were synthesized by reaction of 2‐(5′‐amino‐2′‐hydroxyphenyl)benzazole derivatives with acryloyl chloride and allyl bromide. UV–vis steady‐state fluorescence in solution used to characterize its photophysical behavior. The are the blue, green, yellow, red region, a large Stokes shift between 92 226 nm. A dual ascribed conformational equilibrium ground state dependent on solvent polarity could be observed emission spectra monomers. radical polymerization...
A bis-silylated diethyl 2,5-bis[N,N-(3-triethoxysilyl)propylurea]terephthalate precursor (5) was synthesized from a terephthalate derivative (3) and successfully used to prepare highly fluorescent organosilicas by hydrolytic self-condensation (DPM1) co-condensation (DPM2) with tetraethoxysilane. The dyes 3 5 present absorption in the UV-Vis region fluorescence emission yellow blue regions, respectively. red-shifted bands spectra of dye respect can be related formation intramolecular charge...
Sergio A. Sanchesa, Wallison C. Costab, Ivan H. Bechtoldb, Renato P. Halfena, Aloir Merloa & Leandra F. Campoa*a Instituto de Química, Universidade Federal do Rio Grande Sul, Porto Alegre, RS, Brazilb Departamento Física, Santa Catarina, Florianópolis, SC, Brazil
In this work we describe a simple and efficient general methodology for 2-arylbenzothiazole preparation employing disulfides carboxylic acids. The reaction is promoted by tributylphosphine that acts both in disulfide bond cleavage as activating agent coupling with scope was studied using bis(2-aminophenyl)disulfide different acids donor/withdrawing substituents, which resulted the desired moderate to good yields. method tested success of amyloid probe 2-(4-aminophenyl)-6-methoxybenzothiazole...