A5037311126- Lanthanide and Transition Metal Complexes
- Radioactive element chemistry and processing
- Magnetism in coordination complexes
- Vanadium and Halogenation Chemistry
- Luminescence Properties of Advanced Materials
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Inorganic and Organometallic Chemistry
- Analytical Chemistry and Sensors
- Thermal and Kinetic Analysis
- Water Quality Monitoring and Analysis
- Analytical chemistry methods development
- Advanced Cellulose Research Studies
- Analytical Chemistry and Chromatography
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Boron Compounds in Chemistry
- Metal-Organic Frameworks: Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- Chemical Thermodynamics and Molecular Structure
- Catalysis for Biomass Conversion
- Advanced MRI Techniques and Applications
- Chemical Synthesis and Reactions
- Synthesis of Organic Compounds
- Biotechnology and Related Fields
Universidade Federal Rural de Pernambuco
2012-2024
Teradata (United Kingdom)
2020
Universidade Federal de Pernambuco
2001-2019
Universidade Federal de Roraima
2006
The electrocatalytic activity of cobalt(II)-phthalocyanine immobilized in a carbon paste electrode for citric acid oxidation under diffusion-controlled electrochemical process was employed to develop selective flow injection amperomettric analysis method. Under optimized conditions, rapid and reliable determinations (65 samples per hour) were achieved analyses commercial fruit juices with minor pretreatment the samples. A linear response accomplished ranging from 0.25 15 mmol L(-1)...
The vanadium(V) complexes have been investigated as potential anticancer agents which makes it essential to evaluate their toxicity for safe use in the clinic. large-scale synthesis and acute oral mice of oxidovanadium(V) Schiff base catecholate complex, abbreviated [VO(HSHED)dtb] containing a redox-active ligand with tridentate (HSHED = N-(salicylideneaminato)-N’-(2-hydroxyethyl)-1,2-ethylenediamine) dtb 3,5-di-(t-butyl)catechol ligands were carried out. body weight, food consumption, water...
Vanadium compounds are known to exert insulin-enhancing activity, normalize elevated blood glucose levels in diabetic subjects, and show significant activity models of insulin resistance (IR). Faced with resistance, the present work investigates antidiabetic performance a oxidovanadium(IV)-based coordination compound—[VIVO(octd)]—and effects associated glucocorticoid-induced mice. The [VIVO(octd)] were evaluated female Swiss mice model induced by seven days dexamethasone treatment comparison...
This work presents the synthesis and spectroscopic study of new homotrinuclear (TRI) systems for photonics applications. The luminescence spectroscopy shows characteristics transitions Eu(III) Tb(III) ions. For Gd(III) complexes, triplets states were determined by phosphorescence measurement. complexes' coordination geometries calculated using Sparkle/AM1 model. europium systems, used to calculate all details involved in energy transfer process, theoretical quantum yields determined. From an...
Novel functionalized silica, containing 3,6-dithia-1,8-octanediol (Si-DIO), was synthesized and characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM) nuclear magnetic resonance (NMR) of 13C 29Si. The Si-DIO used to pre-concentrate determine the amount Pb(II) in milk samples employing a multicommuted flow system coupled flame atomic absorption spectrometry (FAAS). For adsorption process, pre-concentration minicolumn with 100 mg...
The synthesis and characterization of 21 complexes Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) with 2,6-pyridinedicarboxilic acid, (dipicolinic acid [DPA]), 4-hidroxypiridine-2,6-dicarboxilic (chelidamic [DAMIC]), chelidonic (DONIC) is reported. were characterized by CHN elemental analysis, infrared ultraviolet spectroscopies. obtained electronic spectra employed to calculate the 10 Dq values. observed sequence in values is: Fe (III) > Cr Ni (II) Co for DPA DONIC complexes. For...
Polyoxovanadates (POV) are a subgroup of polyoxometalates (POM), which nanosized clusters with reported biological activities. This manuscript describes the first toxicity evaluation mixed-valence polyoxovanadate, pentadecavanadate, (Me4N)6[V15O36Cl], abbreviated as V15. Cytotoxicity experiments using peripheral blood mononuclear cells (PBMC), larvae Artemia salina Leach, and in vivo oral acute repeated 28-day doses mice was carried out. The LC50 values PBMC A. were 17.5 ± 5.8 μmol L-1, 17.9...
This is a report on the synthesis, characterization and spectroscopic study of 24 lanthanide-crown ether coordination compounds, where Eu(III), Tb(III) Gd(III) were complexes to 12-crown-4 (12C4), 15-crown-5 (15C5), 1,10-phenanthroline (phen) 2,2′-dipyridyl (dipy). The compounds synthesized in an ethanol/acetone solution at room temperature analyzed using CHN elemental analysis infrared, absorption emission spectroscopies. polarizability that ligand exerts process was verified found...
The complexes [Eu(12-crown-4)(terpy)(H2O)]3Cl, [Eu(15-crown-5)(terpy)]3Cl, [Tb(12-crown-4)(terpy)(H2O)]3Cl, [Tb(15-crown-5)(terpy)]3Cl, [Gd(12-crown-4)(terpy)(H2O)]3Cl and [Gd(15-crown-5)(terpy)]3Cl (terpy = 2,2′,6′,2′′-terpyridine) were synthesized characterized by CHN elemental analysis, infrared spectroscopy fluorescence spectroscopy. Emission spectra obtained on both, solid state aqueous solutions for europium terbium complexes. exhibit good emission, even in solution, enhancing their...
APPLICATIONS, FERRIER REARRANGEMENT AND REACTIONS.In carbohydrate chemistry, the O-glycoside is an organic molecule in which sugar bound to another functional group via a glycosidic bond.In last few years, considerable progress has been made synthesis and applications of O-glycosides.Despite their challenging due versatility, O-glycosides play pivotal role development chemistry novel materials bioactive molecules.This review summarizes recent developments, twenty about Ferrier rearrangement...
An amine-functionalized porous sol–gel silica film was shown to be an effective platform immobilize small anionic redox mediators of high solubility on solid electrodes by electrostatic interaction. The highly soluble mediator hexacyanoferrate used as a model. grown and firmly anchored gold electrode surface via thiol groups self-assembled monolayer (3-mercaptopropyl)trimethoxysilane. Film growth thickness were controlled electrochemical modulation pH at the electrode/solution interface in...
The platinum-based coordination compounds consist of an important class antineoplastic chemotherapeutics with a view to their worldwide commercialization.Even cisplatin being officially approved in 1978 by the FDA, Cairns (in 1975) and Nowell (1976) had already postulated emergence drug-resistant tumor cells via somatic evolution; i.e., need for reflection on Darwinian dynamics was known.The evolutionary adaptations cancer must be known order avoid arise multidrug resistance phenomenon...