Marcelino Maneiro

• PhD
• Professor at University of Santiago de Compostela

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...

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...

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 .

In this work, four manganese(II) complexes derived from the ligands H2L¹-H2L⁴, that incorporate dansyl or tosyl fluorescent dyes, have been investigated in term of their antioxidant properties. Two of the manganese(II) complexes have been newly prepared using the asymmetric half-salen ligand H2L² and the thiosemicarbazone ligand H2L³. The four orga...

We present the synthesis and characterization of a series of Mn(III), Co(III), and Ni(II) complexes with cross-bridge cyclam derivatives (CB-cyclam = 1,4,8,11-tetraazabicyclo[6.6.2]hexadecane) containing acetamide or acetic acid pendant arms. The X-ray structures of [Ni(CB-TE2AM)]Cl2·2H2O and [Mn(CB-TE1AM)(OH)](PF6)2 evidence the octahedral coordin...

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...

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.

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...

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...

Neste traballo que hoxe presentamos pretendemos chamar a vosa atención sobre o moito e valioso material científico que pode existir nos vosos centros, e ao que non se lle dá valor ningún, para que vós, o valoricedes e evitedes que se perda. Pedímosvos e animámosvos a que vos convertades en gardiáns dese preciado material que poda existir nos vosos...

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 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...

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...

Several bifunctional chelators have been synthesized in the last years for the development of new ⁶⁴Cu-based PET agents for in vivo imaging. When designing a metal-based PET probe, it is important to achieve high stability and kinetic inertness once the radioisotope is coordinated. Different competitive assays are commonly used to evaluate the poss...

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...

Investigating the relaxation of water ¹H nuclei induced by paramagnetic Mn(II) complexes is important to understand the mechanisms that control the efficiency of contrast agents used in diagnostic magnetic resonance imaging (MRI). Herein, a series of potentially hexadentate triazacyclononane (TACN) derivatives containing different pendant arms were...

General Discussion on Emerging technologies at the Faraday Discussion on Carbon dioxide utilisation

General Discussion on Thermal catalytic conversion at the Faraday Discussion on Carbon dioxide utilisation

Since the potential anticancer activity of auranofin was discovered, gold compounds have attracted interest with a view to developing anticancer agents that follow cytotoxic mechanisms other than cisplatin. Two benzimidazole gold(I) derivatives containing triphenylphosphine (Au(pben)(PPh3)) (1) or triethylphosphine (Au(pben)(PEt3)) (2) were prepare...

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...

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 new manganese(III) complex [MnL1(DCA)(H2O)](H2O),1 [H2L1 is the chelating ligand N,N'-bis(2-hydroxy-3-methoxybenzylidene)-1,2-diaminopropane, and DCA is dicyanamide], has been prepared and characterized by different analytical and spectroscopic techniques. The tetragonally elongated octahedral geometry for the manganese coordination sphere was re...

Featured Application Kraft pulp bleaching and delignification. Abstract 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...

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...

O ano 2019 foi nomeado pola ONU “Ano Internacional do Sistema Periódico” para celebrar numerosas efemérides no mundo da Química. Entre outros acontecementos celébranse: os 230 anos da publicación do famoso libro de Lavoisier o “ Tratado Elemental de Química”, onde aparece por vez primeira unha táboa onde están recollidos os elementos químicos coñec...

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 ability of Ba2Mn2 supramolecular (1) box to split water has been studied by means of Water photolysis experiments.DFT calculations show that (1) can follow a mechanism with successive hudrogen abstrations from water molecules bound to the metal ion by optically excited p-benzoquinone

ABTS (2,2'-azinobis(3-ethylbenzothiazoline)-6-sulfonic acid) oxidation to form its radical cation in the presence of H2O2 is frequently used as a test for determining the peroxidase activity of enzyme mimics. Detailed studies using salen-type Mn(III) complexes show that photochemical processes involving H2O2, ABTS, and the complex itself can lead t...

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 oxygen-evolving complex (OEC) is the native enzyme that catalyzes the oxidation of water in natural photosynthesis. Two new classes of manganese cluster complexes of formula Ba2Mn2L12(H3L1)2(CH3OH)4 1 and Mn4L26Cl2 2 were prepared (H4L1 = N,N′-(ethane-1,2-diyl)bis(2-hydroxybenzamide); L2 = methyl picolinimidate) and characterized by standard te...

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.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and...

The asymmetric ligand ( E )-4-bromo-2-(((2-((5-bromo-2-hydroxybenzyl)(methyl)amino)ethyl)imino)methyl)phenol has been prepared by a novel seven-step route. All organic compounds isolated in each step have been characterised by elemental analysis, infrared and 1 H NMR spectroscopy, and mass spectrometry. Interaction of this ligand with manganese has...

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...

Síntese dunha nova familia de complexos metálicos cunha estrutura suramolecular en forma de caixa, cun tamaño que se pode modular en función da composición do complexo e que pode presentar propiedades catalíticas . Os complexos incorporan manganeso, un metal activo desde o punto de vista redox, e presentan a formulación xeral [Mn(L)MD)x]n, sendo M...

The discussion of the photolytic behaviour includes advances in the knowledge of the structural motifs and the chemical activity of this type of complex, as revealed by the development of several characterization techniques in the last decade. Parallel-mode MnIII EPR shows that complexes [LMnD] X not only mimic reactivity but also share some struct...

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...

Kraft pulp has to be bleached to eliminate the chromophoric structures, which cause a darkening of the pulp. In Nature, an equivalent role is assumed by ligninolytic enzymes such as lignin peroxidases, manganese peroxidases and laccases. The development of low molecular weight manganese peroxidase mimics may achieve environmentally-safe bleaching c...

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.

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 (...

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...

Five Mn(III) nitrate complexes have been synthesized from dianionic hexadentate Schiff bases obtained by the condensation of 3-ethoxy-2-hydroxybenzaldehyde with different diamines. The complexes have been characterized by elemental analysis, ESI mass spectrometry, IR and H NMR spectroscopy, r. t. magnetic, and molar conductivity measurements. Paral...

The peroxidase and catalase activities of eighteen manganese–Schiff base complexes have been studied. A correlation between the structure of the complexes and their catalytic activity is discussed on the basis of the variety of systems studied. Complexes 1–18 have the general formulae [MnLn(D)2](X)(H2O/CH3OH)m, where Ln = L1–L13; D = H2O, CH3OH or...

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...

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 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...

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...

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 pyridyl and benzene rings in the title compound, C25H26N4 center dot 2H(2)O, show significant deviation from coplanarity due to a twist in the molecule, and this is reflected in the C-N( H)-C-C torsion angles of -82.8 (3) and 70.8 (3)degrees. The supramolecular architecture is effected by O-H center dot center dot center dot O quadrilaterals, o...

The pyridyl and benzene rings in the title compound, C25H26N4·2H2O, show significant deviation from coplanarity due to a twist in the mol­ecule, and this is reflected in the C—N(H)—C—C torsion angles of −82.8 (3) and 70.8 (3)°. The supra­molecular architecture is effected by O—H⋯O quadri­laterals, one-dimensional N—H⋯O chains, two-dimensional netwo...

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...

Four novel manganese(III) complexes have been prepared using the tetradentate ONNO symmetrical Schiff base N,N′‐(1,2‐phenylene)‐bis(3‐hydroxysalicylidenimine) H4L and employing different manganese(II) and manganese(III) starting salts (chloride, acetate, acetylacetonate and perchlorate). These complexes were thoroughly characterised by elemental an...

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)...

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...