Browsing CIQUS-Artigos by Title
Now showing items 366-385 of 391
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A theoretical study of ternary indole–cation–anion complexes
(Royal Society of Chemistry, 2014-09-03)The simultaneous interactions of an anion and a cation with a π system were investigated by MP2 and M06-2X theoretical calculations. Indole was chosen as a model π system for its relevance in biological environments. Two ... -
Thermoelectric properties of heavy-element doped CrN
(AIP Publishing, 2014)CrN was doped with Mo and W to study the effect of heavy elements alloying on its thermoelectric properties. An spontaneous phase segregation into Mo- and W-rich regions was observed even at the lowest concentrations probed ... -
Thickness dependence of exchange coupling in epitaxial Fe3 O4/ CoFe2 O4 soft/hard magnetic bilayers
(APS Physics, 2016)Epitaxial magnetic heterostructures of ( soft − ) Fe 3 O 4 / ( hard − ) CoFe 2 O 4 ( 001 ) have been fabricated with a varying thicknesses of soft ferrite from 5 to 25 nm. We report a change in the ... -
Three-State Switchable Chiral Stationary Phase Based on Helicity Control of an Optically Active Poly(phenylacetylene) Derivative by Using Metal Cations in the Solid State
(American Chemical Society, 2019-05-07)An unprecedented three-state switchable chiral stationary phase (CSP) for high-performance liquid chromatography (HPLC) was developed using a helical poly(phenylacetylene) bearing a chiral (R)-α-methoxyphenylacetic acid ... -
TiO2‐Based Photocatalysis at the Interface with Biology and Biomedicine
(Wiley, 2019)The conversion of sunlight into chemical energy by using photosynthetic machinery is at the heart of nature and life. Scientists have also learned to use light energy to promote a great variety of chemical reactions, most ... -
Towards Ratiometric Sensing of Amyloid Fibrils In Vitro
(Wiley, 2015)The aggregation of amyloid‐β peptide and its accumulation in the human brain has an important role in the etiology of Alzheimer’s disease. Thioflavin T has been widely used as a fluorescent marker for these amyloid aggregates. ... -
Towards taxane analogues synthesis by dienyne ring closing metathesis
(Royal Society of Chemistry, 2016-10-01)Herein we report the facile construction of taxadiene analogues by ring closing metathesis of dienynes built on a cyclohexenone with a natural configuration at C1 and its further transformation to incorporate most of the ... -
Transition metal catalysis in the mitochondria of living cells
(Nature Publishing Group, 2016-09-07)The development of transition metal catalysts capable of promoting non-natural transformations within living cells can open significant new avenues in chemical and cell biology. Unfortunately, the complexity of the cell ... -
Transition Metal-mediated Reactions in Biological Media
(Swiss Chemical Society, 2018)Transition-metal catalysis has changed the way in which chemical reactions can be accomplished. While most metal-catalyzed reactions have been achieved in organic solvents, recent work has demonstrated that many of these ... -
Transition Metal‐Promoted Reactions in Aqueous Media and Biological Settings
(Wiley, 2021)During the last decade, there has been a tremendous interest for developing non‐natural biocompatible transformations in biologically relevant media. Among the different encountered strategies, the use of transition metal ... -
Transition-Metal-Catalyzed Annulations Involving the Activation of C(sp3)−H Bonds
(Wiley, 2021)The selective functionalization of C(sp3)-H bonds using transitionmetal catalysis is among the more attractive transformations of modern synthetic chemistry. In addition to its inherent atom economy, such reactions open ... -
Tuning the helical sense and elongation of polymers through the combined action of the two components of tetraalkylammonium-anion salts
(Elsevier, 2021)The helical sense and elongation of a helical polymer that bears the 4-ethynylanilide of (R)-α‑methoxy-α-phenylacetic acid [m-(R)-1] can be tuned by the action of the two components of tetraalkylammonium-anion salts. Thus, ... -
Tuning the properties of penetrating peptides by oxime conjugation
(Georg Thieme Verlag, 2017-01-25)We here describe the application of oxime bond formation between a peptide scaffold and different aldehydes to modify the transporting capabilities of penetrating peptides. We show that bonds such as oximes offer a great ... -
Tuning the Size of Nanoassembles: A Hierarchical Transfer of Information from Dendrimers to Polyion Complexes
(Wiley, 2018-04-27)The generation of dendrimers is a powerful tool in the control of the size and biodistribution of polyion complexes (PIC). Using a combinatorial screening of six dendrimers (18–243 terminal groups) and five oppositely ... -
Tunneling and Conformational Flexibility Play Critical Roles in the Isomerization Mechanism of Vitamin D
(American Chemical Society, 2011-11-27)The thermal isomerization reaction converting previtamin D to vitamin D is an intramolecular [1,7]-sigmatropic hydrogen shift with antarafacial stereochemistry. We have studied the dynamics of this reaction by means of the ... -
Tunneling splitting in double-proton transfer: Direct diagonalization results for porphycene
(AIP Publishing, 2014-11-05)Zero-point and excited level splittings due to double-proton tunneling are calculated for porphycene and the results are compared with experiment. The calculation makes use of a multidimensional imaginary-mode Hamiltonian, ... -
A Two-Step, Stereoselective Synthesis of Nine- and Ten-Membered Carbocycles from Phthalates
(American Chemical Society, 2015)A two-step, stereoselective procedure for the synthesis of nine- and ten-membered carbocycles from readily available phthalates is described. A variety of dialkyl phthalates have been transformed into [6,n]-fused bicyclo ... -
Ultrafast deactivation of bilirubin: dark intermediates and two-photon isomerization
(Royal Society of Chemistry, 2016)Bilirubin is a neurotoxic product responsible for neonatal jaundice, which is generally treated by phototherapy. The photoreaction involves ultrafast internal conversion via an elusive intermediate and Z–E isomerization ... -
Unexpected Chiro-Thermoresponsive Behavior of Helical Poly(phenylacetylene)s Bearing Elastin-Based Side Chains
(Wiley, 2017-08-09)The thermoresponsive behavior of an elastin-based polymer can be altered by the polymeric macromolecular conformation. Thus, when the elastin basic amino acid sequence VPGVG is used as a pendant group of a poly(phenylacetylene) ... -
Unravelling the spin-state of solvated [Fe(bpp)2] 2+ spin-crossover complexes: structure-function relationship
(Royal Society of Chemistry, 2018-05-02)