Results 31 to 40 of about 12,051 (164)

Stepwise On‐Surface Synthesis and Transformations of Two‐Dimensional Covalent Organic Frameworks by Controlled Thermal Stimuli

Advanced Materials, EarlyView.
The seminal transformation of a 2D‐COF (SURFCOF‐IMDEA1) into a 2D porous COF (SURFCOF‐IMDEA2) on Au(111) by a sequential C‐C coupling and ladderization triggered by thermal annealing steps at increasing temperatures is reported. Abstract The development of covalent organic frameworks (COFs) is currently a primary objective in materials science, taking ...
Ana Barragán, Elena Pérez‐Elvira, Diego J. Vicent, Marco Lozano, Diego Soler‐Polo, Koen Lauwaet, José M. Gallego, Rodolfo Miranda, José I. Urgel, Pavel Jelínek, Nazario Martín, David Écija   +11 more
wiley   +1 more source

Counterintuitive Fluorescence Blue Shift in Symmetry Breaking Dicationic Bis(indolium) with Two‐Photon Absorption Properties for NIR Living Cell Imaging

Advanced Materials, EarlyView.
Highly water‐soluble dicationic bis(indolium) dyes have been prepared, showing excellent two‐photon absorption and light emission. Their fluorescence behavior discloses an unusual increasing blue shift with increasing solvent polarity, which, in parallel, is beneficial for enhanced detection in biological media.
Carlos Benitez‐Martin, Jose M. Marin‐Beloqui, Juan T. López Navarrete, Juan Casado, Francisco Najera, Ezequiel Perez‐Inestrosa   +5 more
wiley   +1 more source

Rational Design and Multicomponent Synthesis of Lipid–Peptoid Nanocomposites towards a Customized Drug Delivery System Assembly

Molecules, 2023
Nanotechnology has assumed a significant role over the last decade in the development of various technologies applied to health sciences. This becomes even more evident with its application in controlled drug delivery systems.
Thaissa Pasquali F. Rosalba, Guilherme D. R. Matos, Carlos Eduardo M. Salvador, Carlos Kleber Z. Andrade   +3 more
doaj   +1 more source

Self‐Cooling Molecular Spin Qudits

Advanced Materials, EarlyView.
A material made of [GdEr] molecular dimers can encode a qudit and perform as a magnetic refrigerant. Microwave resonant pulses coherently manipulate its 16 spin states, while direct demagnetization measurements cool the material and a device down to temperatures below 1 K.
Elías Palacios, David Aguilà, David Gracia, Diamatoula Maniaki, Leoní A. Barrios, Alessandro Chiesa, Jesús I. Martínez, Valentin Novikov, Olivier Roubeau, Stefano Carretta, Marco Evangelisti, Guillem Aromí, Fernando Luis   +12 more
wiley   +1 more source

Synthesis of acylhydrazino-peptomers, a new class of peptidomimetics, by consecutive Ugi and hydrazino-Ugi reactions

Beilstein Journal of Organic Chemistry, 2016
Herein we describe a versatile approach for the synthesis of acylhydrazino-peptomers, a new class of peptidomimetics. The key idea in this approach is based on a simple route using a one-pot hydrazino-Ugi four-component reaction followed by a ...
Angélica de Fátima S. Barreto, Veronica Alves dos Santos, Carlos Kleber Z. Andrade   +2 more
doaj   +1 more source

Constituintes químicos isolados dos caules de Michelia champaca L. (Magnoliaceae)

Eclética Química, 2018
O fracionamento cromatográfico da fase diclorometânica dos caules de Michelia champaca, forneceu quatro substâncias: álcool 4-O-β-D-glicopiranosídeo sinapílico, aldeído 4-O-β-D-glicopiranosídeo sinápico, siringaresinol e N-acetilnonaina.
Maisa Cristina Morais Monteiro, I. H. Leptokarydis, Geraldo H. Silva, Vanderlan S Bolzani, Viviane Cândida da Silva, Maria Cláudia Marx Young, M. N. Lopes   +6 more
doaj   +1 more source

Experimentação para o ensino de química orgânica: um kit genérico de arraste a vapor/ hidrodestilação e sua viabilidade no ensino [PDF]

, 2022
Recently, several methodologies have been applied to help in the chemistry teaching process, to attract students to produce meaningful learning. Organic chemistry in basic education is in a restricted scenario of experimental practices.
Silva, Bianca Angelica da
core  

A Cu‐Based Near‐IR Active MOF with an Ion‐Pair Guest Exhibiting Versatile and Selective Gas‐Solid Reactivity

Advanced Materials, EarlyView.
The new Cu‐containing MOF (Me2NH2)(CuICl2)@[Cu4(INA)4Cl2O]·1.5dmf (3) contains a cation and an anion as guests and shows UV‐near‐mid‐IR absorption and near‐IR emission. MOF 3 shows gas‐solid reactivity in the presence of NH3 and HCOOH to yield two new 3D MOF.
Rajat Saha, Alejandro Cortés‐Villena, Silvia Gómez‐Coca, Alberto Fernández‐Alarcón, Joaquín Calbo, Raquel E. Galian, Enrique Ortí, Eliseo Ruiz, Mónica Giménez‐Marqués, Samia Benmansour, Carlos J. Gómez‐García   +10 more
wiley   +1 more source

A problematização das atividades experimentais no desenvolvimento profissional e na docência dos formadores de professores de química [PDF]

, 2012
Tese (doutorado) - Universidade Federal de Santa Catarina, Programa de Pós-Graduação em Educação Científica e Tecnológica, Florianópolis, 2009Este trabalho busca contribuir na sinalização de possibilidades metodológicas para abordar a experimentação como
Gonçalves, Fábio Peres
core  

Investigative and collaborative experimental activities using simple purification of curcuminoids by column chromatography

Educación Química
This work describes the use of turmeric in the teaching concepts and laboratory techniques of organic chemistry to students in introductory classes of licentiate, bachelor’s and industrial chemistry courses, as well as to pharmacy and chemical ...
Alessandra Leda Valverde, Lucas Silva Abreu, Carlos Magno Rocha Ribeiro   +2 more
doaj   +1 more source