JBCS

9:40, Tue May 23

Open Access/APCs

vol. 26, No. 12, 2015, p. 2389-2639

 

Shedding Light on Chemistry

The General Assembly of the United Nations proclaimed the year 2015 as the International Year of Light and Light-Based Technologies. Light is connected with humans in several ways. From photosynthesis to health, optics and photonics, light has revolutionized our society.
The advancement of photonics allowed light to be present in almost any device used by us, from an advanced research or medical equipment to simple home-appliances. Light is also revolutionizing many fields of research and technology such as in medicine, communications, computers, etc. Photons are perhaps the tool mostly used by chemists, because they are present both in the preparation of chemicals and materials as well as in their analysis. Some photochemists use the interaction of light and materials to bring new properties to molecules and others use special materials to change properties of photons.

(Read more at Editorial)

Special Issue International Year of Light




Editorial J. Braz. Chem. Soc. 2015, 26(12), 2389

Shedding Light on Chemistry

Sidney J. L. Ribeiro; Maurício S. Baptista

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http://dx.doi.org/10.5935/0103-5053.20150329


Review J. Braz. Chem. Soc. 2015, 26(12), 2390-2404

Tricyclic Cationic Chromophores as Models for New Photoantimicrobials

Mark Wainwright

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Cationic tricyclic photosensitisers such as the phenothiazinium S137 (shown) are highly effective bacterial killers when activated by the correct wavelength light. Microbial killing by reactive oxygen species such as singlet oxygen (1O2) is unaffected by conventional antimicrobial resistance.

http://dx.doi.org/10.5935/0103-5053.20150188

Published online: July 28, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2405-2417

Optically Detected Thermal Effects in Rare-Earth Doped Materials for Host Characterization, Thermometric Devices, Nanothermometry and Biothermometry

Leonardo de S. Menezes; Cid B. de Araújo

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Raman processes (left) and photoluminescence with energy transfer (right) - both are phonon-assisted optical transitions; the energy levels 1 and 2 are supposed to be thermally coupled. The intensity ratios IS/IAS and I2/I1 allow temperature measurements.

http://dx.doi.org/10.5935/0103-5053.20150190

Published online: July 31, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2418-2429

Nonlinear Optical Properties and Femtosecond Laser Micromachining of Special Glasses

Juliana M. P. Almeida; Gustavo F. B. Almeida; Leonardo Boni; Cleber R. Mendonça

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This review presents results on the nonlinear optical characterization of special glasses, as well as on the achievements obtained on the use of femtosecond laser micromachining for advanced processing of such glasses.

http://dx.doi.org/10.5935/0103-5053.20150238

Published online: September 15, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2430-2447

"Photo" Chemistry Without Light?

Wilhelm J. Baader; Cassius V. Stevani; Etelvino J. H. Bechara

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Photochemistry without light: generation of typical photoproducts by chemiexcitation.

http://dx.doi.org/10.5935/0103-5053.20150257

Published online: October 2, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2448-2470

Nanotechnology, Light and Chemical Action: an Effective Combination to Kill Cancer Cells

Daiana K. Deda; Koiti Araki

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Photodynamic therapy (PDT) is based on the combination of nontoxic components (photosensitizer, PS + oxygen) that when activated by low energy light generates cytotoxic species, such as reactive oxygen species (ROS), capable of causing direct damage to biomolecules, triggering tumor cells death. In recent years, the combination of PSs and drug delivery systems is been more extensively explored in order to increase the selectivity and photodynamic efficiency, thus reducing further the side effects of that therapy.

http://dx.doi.org/10.5935/0103-5053.20150316

Published online: November 17, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2471-2495

From Lighting to Photoprotection: Fundamentals and Applications of Rare Earth Materials

Paulo C. de Sousa Filho; Juliana F. Lima; Osvaldo A. Serra

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This review presents an introduction regarding the spectroscopic properties of rare earth elements and their application in solid state optical devices, with a brief discussion of the main mechanisms of light absorption and emission by 4f elements.

http://dx.doi.org/10.5935/0103-5053.20150328

Published online: November 24, 2015

Articles J. Braz. Chem. Soc. 2015, 26(12), 2496-2506

Synthesis and Photophysical Characterization of Novel ESIPT Triazinyl-Benzazole Derivatives

Fábio S. Grasel; Fabiano Barreto; Louise Jank; Valter Stefani

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We present novel ESIPT fluorescent triazinyl-benzazole derivatives. The compounds are photoactive in the blue-orange region with a large Stokes' shift.

http://dx.doi.org/10.5935/0103-5053.20150148

Published online: June 9, 2015


J. Braz. Chem. Soc. 2015, 26(12), 2507-2519

4-(Pyren-1-ylimino)methylphenol and its Silylated Derivative as Chromogenic Chemosensors Highly Selective for Fluoride or Cyanide

Jonatan L. O. Buske; Celso R. Nicoleti; Aluisio A. Cavallaro; Vanderlei G. Machado

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4-(Pyren-1-ylimino)methylphenol and its silylated derivative were synthesized and employed in F- and CN- colorimetric detection in solution. These compounds were used in two strategies, as a chemosensor based on acid-base or in a chemodosimeter approach.

http://dx.doi.org/10.5935/0103-5053.20150149

Published online: June 16, 2015


J. Braz. Chem. Soc. 2015, 26(12), 2520-2524

Enhancement of Optical Absorption, Photoluminescence and Raman Transitions in Bi2O3-GeO2 Glasses with Embedded Silver Nanoparticles

Maylon M. Martins; Diego S. Silva; Luciana R. P. Kassab; Sidney J. L. Ribeiro; Cid B. de Araújo

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Enhancement of the photoluminescence intensity at ca. 1300 nm attributed to the local field growth in the vicinity of the silver nanoparticles in Bi2O3-GeO2 glasses. This result and the others presented in this work illustrate the large potential of Bi2O3-GeO2 with silver nanoparticles (Ag-NPs) to be used in photonic devices.

http://dx.doi.org/10.5935/0103-5053.20150191

Published online: July 31, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2525-2535

Near Infrared Emission at 1000 nm from Nanostructured Pr3+/Yb3+ Co-doped SiO2-Nb2O5 for Solar Cell Application

Wesley C. Muscelli; Felipe T. Aquino; Sidney J. L. Ribeiro; Rogéria R. Gonçalves

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Emission at 1000 nm generated by UV-Vis to near infrared (NIR) energy conversion from nanocomposite and planar waveguide.

http://dx.doi.org/10.5935/0103-5053.20150193

Published online: August 4, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2536-2544

Luminescent Terbium Doped Aluminate Particles: Properties and Surface Modification with Asparagine

José M. A. Caiut; Younes Messaddeq; Hervé Dexpert; Marc Verelst; Sidney J. L. Ribeiro; Jeannette Dexpert-Ghys

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New luminescent asparagine (Asn) modified organic-inorganic hybrid composites based on Tb3+-Al3+ host were obtained. Asn was observed to enhance the host-to-dopant energy transfer.

http://dx.doi.org/10.5935/0103-5053.20150213

Published online: August 25, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2545-2557

NIR Luminescence from Sol-Gel Er3+ Doped SiO2:GeO2 Transparent Gels, Nanostructured Powders and Thin Films for Photonic Applications

Lauro J. Q. Maia; Rogéria R. Gonçalves; Anderson S. L. Gomes; Sidney J. L. Ribeiro

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The 1 mol% Er3+ doped 80SiO2:20GeO2 have an infrared emission, due to the Er3+ 4I13/24I13/2 transition, 4.9 times higher than the for 90SiO2:10GeO2.

http://dx.doi.org/10.5935/0103-5053.20150225

Published online: September 1, 2015


J. Braz. Chem. Soc. 2015, 26(12), 2558-2570

Synthesis and Characterization of Nb2O5:La3+,Eu3+ Phosphors Obtained by the Non-Hydrolytic Sol-Gel Process

Carlos R. Matias; Eduardo J. Nassar; Marc Verelst; Lucas A. Rocha

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Phosphors arranged in a form of sheets with 60 nm of thickness are excited by the light emission region of a light emitting diode emitting ultraviolet (UV, 275, 394 nm), blue (465 nm) or green (525 nm) light displaying strong and narrow red emission lines at around 614 nm.

http://dx.doi.org/10.5935/0103-5053.20150242

Published online: September 18, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2571-2582

FTIR Spectroscopy Revealing the Effects of Laser and Ionizing Radiation on Biological Hard Tissues

Denise M. Zezell; Carolina Benetti; Marcelo N. Veloso; Pedro A. A. Castro; Patricia A. Ana

How to cite this article

 

Infrared spectra of bone, dentine, and enamel, in which organic and inorganic matrix can be affected by high intensity laser irradiation used in dentistry or by gamma radiation in medicine.

http://dx.doi.org/10.5935/0103-5053.20150246

Published online: September 22, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2583-2589

Exploring Light-Based Technology for Wound Healing and Appliance Disinfection

Martha S. Ribeiro; Silvia Cristina Núñez; Caetano P. Sabino; Tania M. Yoshimura; Camila R. Silva; Gessé E. C. Nogueira; Hideo Suzuki; Aguinaldo S. Garcez

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Light-based technology can potentiate the dissemination of phototherapy studies to determine its suitable application in health sciences.

http://dx.doi.org/10.5935/0103-5053.20150253

Published online: September 29, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2590-2597

Eco-Friendly Luminescent Hybrid Materials Based on EuIII and LiI Co-Doped Chitosan

Raquel Alves; Leandro P. Ravaro; Agnieszka Pawlicka; Maria Manuela Silva; Andrea S. S. de Camargo

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Chitosan doped with Eu(CF3SO3)3 presents emissions from blue to red that can be tuned to yield white light. Addition of LiI can lead to electroluminescent devices.

http://dx.doi.org/10.5935/0103-5053.20150267

Published online: October 14, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2598-2606

The Effect of Ormosil Matrix Composition and Alkaline Earth Metal Doping on the Photochromic Response of Ormosil-Phosphotungstate Films

Elias P. Ferreira Neto; Mateus B. Simões; Julia C. Noveletto; Jean M. S. C. Yabarrena; Sajjad Ullah; Ubirajara P. Rodrigues Filho

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The photochromic response of Ormosil-phosphotungstate hybrid films can be enhanced up to 7 times by doping with alkaline earth metal cation and tailored by varying the matrix composition.

http://dx.doi.org/10.5935/0103-5053.20150282

Published online: October 27, 2015


J. Braz. Chem. Soc. 2015, 26(12), 2607-2614

Optical and Structural Studies of Mn2+ Doped SbPO4-ZnO-PbO Glasses

Renata S. Manzan; José P. Donoso; Claudio J. Magon; Igor d'Anciães A. Silva; Christian Rüssel; Marcelo Nalin

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Red emission spectra of the glasses with different amounts of MnO (left) and samples 0Mn and 10Mn without irradiation (right, upper) and during irradiation with λ = 408 nm (right, bottom).

http://dx.doi.org/10.5935/0103-5053.20150289

Published online: October 30, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2615-2622

Chlorophyllin Derivatives as Photosensitizers: Synthesis and Photodynamic Properties

Adjaci F. Uchoa; Aaron M. Konopko; Maurício S. Baptista

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New non-symmetric and positively-charged PDT photosensitizers were obtained by using inexpensive copper-chlorophyllin as raw material and a simple chemical route.

http://dx.doi.org/10.5935/0103-5053.20150290

Published online: October 30, 2015

J. Braz. Chem. Soc. 2015, 26(12), 2623-2628

Down- and Up-Conversion Photoluminescence of Carbon-Dots from Brewing Industry Waste: Application in Live Cell-Imaging Experiments

Carime V. Rodrigues; José R. Correa; Carlos M. Aiube; Lorena P. Andrade; Pedro M. Galvão; Pâmela A. Costa; Ariadna L. Campos; Anderson J. Pereira; Grace F. Ghesti; Jorlandio F. Felix; Ingrid T. Weber; Brenno A. Neto; Marcelo O. Rodrigues

How to cite this article

 

Carbon dots (C-dots) have been synthesized from brewing industry waste and applied as bioprobes for live cell-imaging experiments with interesting results.

http://dx.doi.org/10.5935/0103-5053.20150291

Published online: October 30, 2015


J. Braz. Chem. Soc. 2015, 26(12), 2629-2639

Low Temperature Synthesis of Luminescent RE2O3:Eu3+ Nanomaterials Using Trimellitic Acid Precursors

Ivan G. N. Silva; Danilo Mustafa; Maria C. F. C. Felinto; Wagner M. Faustino; Ercules E. S. Teotonio; Oscar L. Malta; Hermi F. Brito

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Commission Internationale de l'Eclairage (CIE) diagram and photographs [RE(TLA):Eu3+] and RE2O3:Eu3+, excited under UV radiation.

http://dx.doi.org/10.5935/0103-5053.20150314

Published online: November 16, 2015

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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