Ana M. González-Noya

• Associate Professor
• University of Santiago de Compostela

2,5-furandicarboxaldehyde (DFF) is one of the most promising biomass-based building blocks for the synthesis of biobased polymers. DFF can be obtained from 5-hydroxymethylfurfural (HMF), a fructose derivate, and it is a key molecule in the sequence of reactions of furan chemistry to develop biobased plastics. In this frame, four manganese(III)–Schi...

Cluster helicates are a new type of supramolecular architectures that consist in a metal cluster wrapped around by ligands arranged in a helical mode. This class of compounds combines the...

A Química Bioinorgánica representa a disciplina emerxente da ciencia que estuda o papel que xogan os elementos inorgánicos en medios biolóxicos. Os elementos químicos inorgánicos inciden nos organismos vivos por múltiples vías. Nalgúns casos son esenciais para o desenvolvemento de funcións vitais dos organismos, ao estar presentes de forma natural...

A importancia do uso da historia da ciencia na didáctica da aula é, hoxe, un feito incuestionable. Pero utilizamos, coa frecuencia que debemos, os feitos gloriosos das nosas ciencias para ensinarlle ao noso alumnado como se constrúe o pensamento científico? Que é e que significa, hoxe, o feito do descubrimento científico? Estamos en condicións de a...

Nesta práctica experimental, exploramos o fenómeno do “efecto salino” sobre diferentes disolucións, para tratar de comprender que son e como actúan as forzas intermoleculares. Realizaremos esta exploración mediante a observación da separación de fases no seguinte experimento: a unha disolución composta por auga e acetona, engádeselle sal de mesa (c...

The number and position of bulky groups in the skeleton of the ligand precursor influence whether helicates or mesocates are obtained.

Manganosalen complexes are a class of catalytic antioxidants with beneficial effects against different neurological disorders according to various in vitro and in vivo studies. The interest in the factors that determine their antioxidant activity is based on the fact that they are key to achieving more efficient models. In this work, we report a se...

In the present work, we report a neutral dinuclear copper(II) complex, [Cu2(L1)(OH)], derived from a new [N,O] donor Schiff base ligand L1 that was formed after the endogenous hydroxylation of an initial carbamate Schiff base H2L coordinated with copper ions in an electrochemical cell. The copper(II) complex has been fully characterized using diffe...

This review aims to analyze the emerging number of studies on biological media that describe the unexpected effects of different natural bioactive antioxidants. Hormetic effects, with a biphasic response depending on the dose, or activities that are apparently non-dose-dependent, have been described for compounds such as resveratrol, curcumin, feru...

Neste traballo queremos dar conta da vida en común de Antoine e Marie, reflexionando sobre algunhas das súas achegas; pero centrándonos fundamentalmente no amor e na amizade que tan frutífera foi e que deu lugar a unha vida investigadora en común de extraordinaria importancia. Pretendemos reflexionar sobre eses escasos 23 anos de vida en común de A...

A xeración dos novos materiais que están a aparecer e, de modo especial, os nanomateriais están abrindo as portas da transformación das industrias da actualidade e, tamén, a transformación das nosas propias vidas. Fálase de familias de novos materiais moito máis eficaces, como os bidimensionais: grafeno, grafino, carbinos, siliceno, xermaneno, esta...

The study of the inherent factors that influence the isolation of one type of metallosupramolecular architecture over another is one of the main objectives in the field of Metallosupramolecular Chemistry. In this work, we report two new neutral copper(II) helicates, [Cu2(L1)2]·4CH3CN and [Cu2(L2)2]·CH3CN, obtained by means of an electrochemical met...

The study of the inherent factors that influence the isolation of one type of metallosupramolecular architecture over another is one of the main objectives in the field of Metallosupramolecular Chemistry. In this work, we report two new neutral copper(II) helicates, [Cu2(L1)2]·4CH3CN and [Cu2(L2)2]·CH3CN, obtained by means of an electrochemical met...

The design of artificial helicoidal molecules derived from metal ions with biological properties is one of the objectives within metallosupramolecular chemistry. Herein, we report three zinc helicates derived from a family of bisthiosemicarbazone ligands with different terminal groups, Zn2(LMe)2∙2H2O 1, Zn2(LPh)2∙2H2O 2 and Zn2(LPhNO2)23, obtained...

The design of artificial helicoidal molecules derived from metal ions with biological properties is one of the objectives within Metallosupramolecular Chemistry. Herein, we report three zinc helicates derived from a family of bisthiosemicarbazone ligands with different terminal groups, Zn2(LMe)2∙2H2O 1, Zn2(LPh)2∙2H2O 2 and Zn2(LPhNO2)2 3, obtained...

The electrochemical oxidation of HMF (5-hydroxymethylfurfural) to DMF (2,5-furandicarboxaldehyde) catalysed by a salen-manganese homogeneous catalyst is reported. DMF is a versatile precursor in the synthesis of functional polymers, pharmaceuticals, antifungal agents, and furan-urea resins. A manganese(III)-Schiff base complex 1 was synthetized and...

We report two different approaches to isolate neutral and cationic mesocate-type metallosupramolecular architectures derived from coinage monovalent ions. For this purpose, we use a thiocarbohydrazone ligand, H2L (1), conveniently tuned with bulky phosphine groups to stabilize the MI ions and prevent ligand crossing to achieve the selective formati...

The mechanism of carbamate activation promoted by different metal ions has been explored in this work. The reaction of the carbamate ligand H2L with chloride metal salts (M = Ni, Cu, Zn, Cd) leads to the coordination of the metal ions to the ligand, causing hydrolysis of the systems. This self-immolation process results in mononuclear dihydrazone c...

We show the first example of a bisthiosemicarbazone silver double-tetranuclear cluster helicate [Ag 4 L 2 ] 2 obtained by electrochemical synthesis which undergoes a rare desulfurization process giving rise to a cationic silver dihelicate [Ag 2 (H 2 L) 2 ]SO 4 .

The asymmetric hydrazone-thiosemicarbazone ligand H2L was synthesized in two stages by means of a double-condensation reaction. The potentially dianionic and pentadentate [N3SO] organic ligand H2L possesses two flexible bidentate [NS/NO] domains separated by a pyridine spacer, which could stabilize a wide variety of metal ions, giving rise to diffe...

As medidas de confinamento derivadas da pandemia da COVID afondaron na necesidade do desenvolvemento de ferramentas educativas en liña ás que o alumnado poda acceder en remoto autonomamente de maneira asíncrona. Neste artigo descríbese a nosa proposta dun curso aberto de química en liña a partir dun enfoque experimental, baseado principalmente en p...

No século XVIII non había táboa periódica, pero si existía xa a Química Inorgánica, que os franceses chamaban “Chemie Minerale”. Ata finais do século XVIII e desde os tempos alquímicos, as químicas de todos os tempos miraban canto estaba ao seu redor e investigaban para coñecelo mellor e utilizalo na súa vida cotiá. Deste xeito foron descubrindo e...

Nunha comunicación presentada por nós no XXXII Congreso de ENCIGA, celebrado en Viveiro no ano 2019, titulada “MARIE ANNE e a TÁBOA PERIÓDICA” falabamos da vida desta científica para, comprendendo como fora a súa formación académico-científica, estar en condicións de asimilar mellor as súas contribucións ao desenvolvemento da Táboa Periódica, na ce...

Manganosalen complexes are coordination compounds that possess a chelating salen-type ligand, a class of bis-Schiff bases obtained by condensation of salicylaldehyde and a diamine. They may act as catalytic antioxidants mimicking both the structure and the reactivity of the native antioxidant enzymes active site. Thus, manganosalen complexes have b...

Manganosalen complexes are coordination compounds that possess a chelating salen-type ligand, a class of bis-Schiff bases obtained by condensation of salicylaldehyde and a diamine. They may act as catalytic antioxidants mimicking both the structure and the reactivity of the native antioxidant enzymes active site. Thus, manganosalen complexes have s...

Neste artigo temos como obxectivo dar a coñecer como é o mundo dun tipo de nanomateriais metálicos chamados Puntos Cuánticos (PCs) ou, en terminoloxía inglesa, os Quantum Dots (QDs). A pretensión deste traballo é a de estudar que se entende hoxe por Puntos Cuánticos, como é a súa constitución, cal é o seu tamaño e forma; de que tipo resulta ser o s...

A series of phosphino-thiosemicarbazone gold(I) dinuclear complexes obtained by two different synthetic procedures have been prepared. All the compounds have been spectroscopically characterized including single crystal X ray diffraction analysis in some of cases. [Au2(HL1)Cl2] (1), [Au2(HL2)2]Cl2 (2) and [Au2(HL3)2]Cl2 (3) have been prepared by ch...

Lignin and other colored structures need to be bleached after the Kraft process in the pulp industry. Development of environmentally-safe bleaching catalysts or electrocatalysts constitutes an attractive strategy for selective removal of lignin. Seven manganese(III)-complexes with Schiff base ligands 1–7 were synthetized and characterized by differ...

Hai máis de 40 anos, un de nós e outros profesores do departamento de Química Inorgánica da USC, publicamos o libro “Química Inorgánica. Esquema orientativo y cuestiones fundamentales”. Nese libro pretendiamos desenvolver máis e mellor o temario da materia de Química Inorgánica nesa época e, ao mesmo tempo, facer propostas de cuestións de dificulta...

A química é a ciencia do por qué e do para qué. Este capítulo, cuxa escritura estamos iniciando, tratará de dar resposta a estas preguntas no tema obxecto do libro; o Ano Internacional do Sistema Periódico, así como da súa importancia na comprensión e no estudo da química. O por qué está relacionado coa historia da química e do propio sistema perió...

O ano 2019 foi declarado ANO INTERNACIONAL DA TÁBOA PERIÓDICA polas Nacións Unidas, para conmemorar os 150 anos da publicación por Dimitri Mendeleev da súa táboa periódica e por se celebrar o centenario da creación da IUPAC; pero non se escoita falar nada polo noso País de tal acontecemento. Ao noso grupo de investigación educativa CienciaNOSA pare...

Neste capítulo pretendemos ir amosando como se foron descubrindo moitos dos distintos elementos metálicos nos seus minerarios e como se foron inventando os distintos métodos de beneficiación, para chegar a obtelos puros e preparar as diversas aliaxes de interese industrial que contribuíron ao desenvolvemento da historia da humanidade. Faremos unha...

Nesta comunicación queremos presentar as mulleres pioneiras de Lugo que a finais do século XIX e comezo do XX estudaron carreiras universitarias de Ciencias. Pretendemos dar unha visión do comezo da presenza da muller na universidade e máis concretamente nas carreiras consideradas de ciencias (Farmacia, Medicina, Física, Química, Matemáticas), mos...

The effect of the ligand and/or metal-related factors on the formation of tristhiosemicarbazone metallosupramolecular complexes has been studied in this work. The crystal structures of zinc(II) and lead(II) tristhiosemicarbazone mesocates and a hydrolyzed cadmium(II) helicate let us better rationalize some factors involved in the selective formatio...

The reaction of 2-cyanopyridine and Mn(II) in methanol solution led to the formation of a Mn4L6Cl2 cluster 1 containing O-methyl picolimidate as a ligand (L). The coordination of 2-cyanopyridine to the Mn(II) ion as a chelating bidentate ligand activated the CN triple bond which subsequently suffered a nucleophilic attack by CH3OH. Complex 1 was ch...

The condensation of 3-methoxy-2-hydroxybenzaldehyde and the diamines 1,2-diphenylendiamine, 1,2-diamine-2-methylpropane and 1,3-propanediamine yielded the dianionic tetradentate Schiff base ligands N,N′-bis(2-hydroxy-4-methoxybenzylidene)-1,2-diphenylendiimine (H 2 L ¹ ), N,N′-bis(2-hydroxy-4-methoxybenzylidene)-1,2-diamino-2-methylpropane (H 2 L ²...

1. INTRoDuCIÓN O cambio máis importante atopado na his-toria, dentro do desenrolo da ciencia, dáse no século XVIII: dito século chámase o da Ilustración. É o século da revolución cientí-fica. Xa desde o século XVII existía interese no estudo dos fenómenos naturais; investi-gábase a natureza observándoa e reflectindo os resultados en textos científi...

The effect of the metal ion and ligand design on the enantioselectivity and linkage isomerization of neutral cobalt and zinc bisthiosemicarbazone metallohelicates has been investigated in this work. The electrochemical synthesis has afforded the enantioselective formation of chiral pure cobalt helicates, and the  isomer of a single enantiomer ha...

A dinuclear Pb(ii) mesocate has been prepared with an unprecedented four-coordinated kernel in which the Pb(ii) lone pair is stereochemically active. This is the first time that this effect has been observed in a supramolecular Pb(ii) helicate or meso-helicate.

Gold compounds to be obtained by the direct electrochemical oxidation of a noble metal are reported. This achievement provides an alternative procedure to obtaining neutral gold compounds with potential medical or catalytic applications.

O século XVIII é o século da Ilustración e o da revolución científica; o cambio máis importante dentro da historia da ciencia. No desenvolvemento da ciencia neste século tiveron moita importancia as academias e as sociedades científicas polo seu labor de investigación, promoción e difusión da actividade científica; algunhas destas Institucións incl...

The ability to organize functional molecules into higher dimensional arrays with well-defined spatial relationships between the components is one of the major goals in supramolecular chemistry. We report here a new route for the preparation of supramolecular boxes, incorporating two types of metal ions: (i) alkali-metal ions, which induce the supra...

Usamos complexos catiónicos [LMn]+ como tectones para preparar polímeros de coordinación cunha tipoloxía de rede (L é o dianión da base de Schiff resultante da condensación 2:1 de 3-metoxi o etoxi-salicilaldehido e varias diaminas). O ligando conector vai ser o ligando exodentado con dous átomos dadores de nitróxeno (4,4´-bypiridine, By). [(MnL(H2O...

The synthesis of a new asymmetric ligand (E)-4-bromo-2-(((2-((5-bromo-2-hydroxybenzyl)(methyl)amino)ethyl)imino)methyl)phenol, which was conceived to model the asymmetry in the active site of peroxidase/catalase mimics, is reported. The new synthetic route involves seven steps: 1) obtention of phthalimido-acetal; 2) Acetal deprotection; 3) Synthesi...

Caroline Lucretia Herschel: A dama que domou os cometas e a vida e obra desta extraordinaria muller que foi unha pioneira nas investigacións astronómícas do século XIX que foi e segue a ser una grande descoñecida

A bis-amide bis-phenoxi N2O2 ligand was obtained from the 2:1 molar reaction of phenyl salicylate and the diamine, 1,3-Diamino-2-2-dimethylpropane, to yield H4L. The ligand has been characterised by elemental analysis, IR, and 1H and 13C NMR spectroscopies, mass spectrometry (ES) and X ray diffraction spectroscopy

Mn (III) complexes 1–3, incorporating dianionic hexadentate Schiff base ligands and different anions(perchlorate for 1, acetylacetonate for 2 and dicyanamide for 3) have been synthesized and characterized by elemental analysis, ESI mass spectrometry, IR spectroscopy, room temperature magnetic and molar conductivity measurements. Complex 3 was also...

One bis-amide bis-phenoxi N 2 O 2 ligand was obtained from the 2:1 molar reaction of phenyl salicylate and the diamine, 1,3-Diaminopropane , to yield H 4 L. The ligand has been characterised by elemental analysis, IR, and 1 H 13 C NMR spectroscopies, mass spectrometry (ES) and Xray difraction.

We have studied the factors that affect the formation of different metallosupramolecular architectures by metal direct self-assembly. A synthetic route has been developed to obtain mesocates or dihelicates selectively. For this purpose a series of five bisthiosemicarbazone ligands derived from 1,3-diacetylbenzene were designed and synthesised. Name...

The coordinative chemistry of the tridentate half-salen ligand 5-(dimethylamino)-N-(2-((2-hydroxybenzylidene)amino)phenyl)naphthalene-1-sulfonamide (H(2)L, 1) has been studied by means of an electrochemical method. All of the complexes have been characterised using analytical and spectroscopic techniques. Ligand 1 and two nickel (6 and 7), copper (...

The isolation of the first case of a ‘grid-of-helicates’ allowed us to rationalize the formation of extended 1D-chains or 2D-grid sheets of helicates with Cd(II) ions.

A series of Mn(III) nitrate complexes have been synthesized from dianionic hexadentate Schiff bases obtained by condensation of 3-methoxy-2-hydroxybenzaldehyde with different diamines. The complexes have been characterised by elemental analysis, ESI mass spectrometry, IR and 1H NMR spectroscopy. Magnetic studies and molar conductivity measurements...

Four manganese(III)-Schiff base complexes (1-4) of formula [MnL(n)(H(2)O)(2)](2)(ClO(4))(2)·mH(2)O (n = 1-4; m = 0, 1) have been prepared. The multidentate H(2)L(n) Schiff base ligands consist of 3R,5R-substituted N,N'-bis(salicylidene)-1,2-diimino-2,2-dimethylethane, where R = OEt, OMe, Br or Cl. The complexes have been thoroughly characterized by...

A unique case of a grid-of-mesocates sequentially assembled by supramolecular cobalt(II) meso-helical units connected through hydrogen bonding is reported.

The condensation of 3-methoxy or 3-ethoxy-2-hydroxybenzaldehyde and 1,2 diamine -2-methylpropane, to yield at the dianionic hexadentate Schiff base ligands H2Ln (H2L1, H2L2 respectively). The ligands have been characterised by elemental analysis, IR, 1H and 13C NMR spectroscopies and mass spectrometry (ES). The crystal structure of the two ligands...

A novel neutral triple-stranded hexanuclear copper(I) cluster helicate [Cu(I)(6)L(3)]·2CH(3)CN derived from a thiosemicarbazone ligand could be synthesized and crystallographically characterized. The MALDI mass spectrum of this complex suggests that the tetranuclear copper(I) cluster helicate [Cu(I)(4)L(2)] is also present in solution. These copper...

Water reduction can be electrochemically promoted by zinc under very mild conditions, as demonstrated by the formation of the complex [Zn(H(2)O)(6)][Zn(3)(L)(3)(mu(3)-O)], whose anion consists of a Zn(3)O(4) cluster incorporating a mu(3)-oxo anion.

A method to modulate the strength of the superexchange coupling interaction in dinuclear helical assemblies based on the coordination preferences of the metal centres is described.

A [4+4] double-stranded cadmium dihelicate was afforded from an easily accessible thiosemicarbazone ligand; its crystal structure reveals the assembly of two enantiomers into dihelicate pairs, these pairs being further connected into infinite linear chains.

Three hexadentate Schiff base ligands were obtained by condensation of 3-ethoxy-2-hydroxybenzaldehyde and different diamines (1,2-diaminoethane, 1,2-diaminopropane, 1,2-diamino-2-metylpropane) to yield H2Ln (H2L1, H2L2 and H2L3, respectively). The ligands have been characterised by elemental analysis, IR, and 1H and 13C NMR spectroscopies, mass spe...

The coordinative chemistry of the tridentate thiosemicarbazone ligand 2-pyridinecarboxaldehyde 4-N-ethylthiosemicarbazone (HL(Et)) has been explored by using an electrochemical methodology. All the complexes have been characterized using analytical and spectroscopic techniques. In the case of copper we have isolated two different complexes, with Cu...

A cobalt(II) thiosemicarbazonate mesocate has been structurally characterized as an unexpected mixture of conformational and linkage isomers. Moreover, we have shown that the absence of a nitrogen atom in the spacer of the helicand ligand H(2)L(a), enables the assembly of an achiral mesohelical complex in the case of Co(II) ions.

We have prepared some transition and post-transition metal complexes derived from the pentadentate thiosemicarbazone ligand bis(4-N-ethylthiosemicarbazone)-2,6-diacetylpyridine H(2)L(Et), by both chemical and electrochemical procedures. The complexes have been synthesised and fully characterised, including the crystal structures for the ligand H(2)...

The hexadentate Schiff base ligands were prepared by condensation of 3-ethoxy-2-hydroxybenzaldehyde and different diamines (1,3-diaminopropane, 1,3-diamino-2,2-dimethylpropane, 1,4-diaminobutane) to yield H2Ln (H2L1, H2L2 and H2L3, respectively). The ligands have been characterised by elemental analysis, IR, 1H and 13C NMR spectroscopies and mass s...

The aim of the work described here was to test the general applicability of our recently reported route to cluster helicates and to carry out a systematic study to relate the structural and coordinative properties of the organic strands with the microarchitectures of the resulting cluster helicates. Nine new ZnII, CuI and AgI complexes were prepare...

The coordination behaviour of a new thiosemicarbazone Schiff-base building block, N-{2-([4-N-ethylthiosemicarbazone]methyl)phenyl}-p-toluenesulfonamide, H2L1 (1), incorporating a bulky tosyl group, towards Mn II, Fe II, Co II, Ni II, Cu II, Zn II, Cd II, Ag I, Sn II, and Pb II has been investigated by means of an electrochemical preparative procedu...

Three multidentate Schiff-base ligands were obtained by condensation of different diamines (1,3-diaminopropane, 1,3-diamino-2,2-dimethylpropane, 1,4-diaminobutane) and 3-methoxy-2-hydroxybenzaldehyde to yield H2Ln (H2L1, H2L2 and H2L3, respectively). The ligands have been characterised by elemental analysis, IR, and 1H and 13C NMR spectroscopies, m...

Es de gran interés la química de coordinación del manganeso, debido a su presencia en algunas manganoenzimas como la peroxidasa o la catalasa, que catalizan la descomposición del peróxido de hidrógeno producido durante el metabolismo del oxígeno en las células. SINTESIS. Como continuación de nuestra investigación en este campo 1 , presentamos el es...

Para la obtención de estructuras supramoleculares o multi-dimensionales extendidas, se utilizan un gran número de estrategias sintéticas, como pueden ser: reacciones de auto-ensamblaje metal-asistidas, la interacción no-covalente a través de enlaces moléculares (Van der Waals, de hidrógeno..) el método de construcción por bloques, etc. Una de las e...

The metal complexes studied in this report derive from the ligand 4‐ N ‐phenylthiosemicarbazone‐2‐pyridinecarboxaldehyde, abbreviated HL, and the transition and post‐transition metals manganese, iron, cobalt, nickel, copper, silver, zinc, cadmium and lead. The new complexes were obtained by an electrochemical procedure and were found to be of the f...

The synthesis and structural and spectroscopic characterisation of 12 manganese(III)–Schiff-base complexes of the formula [MnLn(H2O/CH3OH)2](ClO4)(mH2O) (m = 0, 1) are described. The multidentate H2Ln and H4Ln Schiff-base ligands were obtained by condensation of different diamines (1,2-diaminoethane, 1,2-diamino-2-methylethane, 1,2-diamino-2,2-dime...

The use of the tetraanionic bis-amide bis-phenoxy ligands favours aggregation of neighbouring complexes through donor atoms1 (amide and phenoxo oxygen), being one of the best strategies to design and synthesize polynuclear species, which are present in many manganese enzymes. As an extension of our studies in this field, we report herein the prepar...

The interaction of the transition and post‐transition metals manganese, iron, cobalt, nickel, zinc, cadmium and lead, with the ligand 4‐ N ‐methylthiosemicarbazone‐2‐pyridinecarboxaldehyde (HL) through an electrochemical procedure has been investigated. The novel complexes obtained via this synthetic route have the general formulae [M(L) 2 ](H 2 O)...

The influence of the metal size in the nuclearity of the complexes derived from the hydrazone ligand 2,6-bis(1-salicyloylhydrazonoethyl)pyridine [H(4)daps] has been investigated. We have synthesised a series of new complexes [M(H(x)daps)] x yH(2)O, (x = 2,3; y = 0-3) with M = Ag (1), Cd (2), Al (3), Sn (4) and Pb (6), using an electrochemical proce...

Three bis-amide bis-phenoxi N2O2 ligands were obtained from the 2:1 molar reaction of phenyl salicylate and the diamines (1,2-Diaminoethane, 1,3-Diaminopropane and 1,4 Diaminobutane, to yield H4Ln, (H4L10 , H4L20 , H4L23 respectively). The ligands have been characterised by elemental analysis, IR, and 1H 13C NMR spectroscopies, mass spectrometry (E...

The interaction of manganese(II) carboxylate salts [Mn(O(2)CR)(2), where R=ethane, pentane] with H(2)L(1) [N,N'-bis(3-methoxy-2-hydroxybenzaldehyde)-1,2-phenylenediamine] and H(2)L(2) [N,N'-bis(3-ethoxy-2-hydroxybenzaldehyde)-1,2-phenylenediamine] was studied. MnL(1)(O(2)CEt)(H(2)O) (1), MnL(1)(O(2)CPe(n))(H(2)O) (2), MnL(2)(O(2)CEt)(H(2)O)(2) (3)...

Pretendemos no presente libro desvelar o aparente misterio da orixe do nome dos elementos químicos que integran o sistema periódico. Dun modo sinxelo e ameno intentamos facer unha aproximación etimolóxica á orixe do nome dos elementos químicos. A obra está dividida en tres capítulos e unha pequena introdución. Nela facemos unha aproximación históri...

The first [5+5] coordination isomer of a zinc helical dimer derived from a pentadentate bisthiosemicarbazone Schiff base ligand was obtained by means of a new route. This compound was synthesised using a template procedure, spectroscopically characterised and recrystallised in a 1:1 v/v dichloromethane/acetonitrile mixture. The geometry showed by t...

Neutral manganese(ii), iron(ii), cobalt(ii), nickel(ii), zinc(ii) and cadmium(ii) complexes with an N-tosyl-substituted N4-donor Schiff base containing a 4,4'-methylenedianiline residue as spacer [H2La: N,N'-bis(2-tosylaminobenzylidene)-4,4'-methylenedianiline], and the zinc(ii) complex with an analogous ligand [H2Lb: N,N'-bis(2-tosylaminobenzylide...

Interaction of asymmetrical Schiff base ligands H3Ln [where H3Ln are substituted 3–aza–4–(2–hydroxyphenyl)–N– (2–hydroxyphenyl)but–3–enamide] with Mn(acac)3 (acac = acetylacetonate) has been investigated. Two different type of manganese(III) complexes have been obtained depending on the nature of the substituents on the ligand. We have found that l...

M(HL)(H2O)n complexes have been obtained by the electrochemical reaction of Fe, Co, Ni, Cu, Zn and Cd anodes with the potentially pentadentate and trianionic asymmetrical Schiff base 3-aza-N-{2-[1-aza-2-(5-nitro-2-hydroxylphenyl)-vinyl]phenyl}-4-(5-nitro-2-hydroxyphenyl)but-3-enamide (H3L), containing a hard amido donor atom. The complexes have bee...

(Chemical Equation Presented) Self control! A potentially dianionic helicand ligand is used to exert control over the assembly of metal complexes into common helical structures or supramolecular clusters depending on the oxidation state of the metal (see scheme). In the tetranuclear cluster dihelicates, a polyhedron of metal ions is the helical axi...

The use of dicompartmental ligands can lead to obtain dinuclear complexes. The interest in the preparation and study of metallic complexes with 3d-4f ions is based on their magnetic, optic and electric properties. In this communication, we present the synthesis and characterization of dinuclear Mn(III)-La(III) complexes with tetraanionic and dianio...

In this paper we describe the electrochemical synthesis and characterization of new neutral manganese, iron, cobalt, nickel, copper, zinc, cadmium and lead complexes with the ligand bis(4-N-methylthiosemicarbazone)-2,6-diacetylpyridine, H4DAPTsz-Me. X-Ray structures of [Mn(H2DAPTsz-Me)(EtOH)2] 1, [Pb(H2DAPTsz-Me)] 3 and [Zn(H2DAPTsz-Me)]2·EtOH·2H2O...

Obtención de los complejos de Mn(III) de fórmula general [Mn(H2L)(H2O)(X) X= Ac-, ClO4-, donde L es la base de Schiff dianiónica obtenidas por condensación de 3-hidroxi-2-hidroxibenzaldehido con fenilendiamina . Los complejos se han caracterizado por análisis elemental, espectrometría de masas de electrospray, espectroscopia infrarroja, RMN de 1H,...

Three novel neutral manganese(III) complexes of stoichiometry Mn(R-amsal-3,5-di-tBu)(H2O)n [H3-R-amsal-3,5-di-tBu = 3-aza-4-(2-hydroxyphenyl)-N-(2-hydroxyphenyl)but-3-enamide; (R = H, 4-Me, 5-tBu)] have been synthesised using potentially trianionic and pentadentate Schiff-base ligands containing an amide group. Complexes were thoroughly characteris...