100 años investigando el mar. El IEO en su centenario (1914-2014).

Se trata de un libro que pretende divulgar a la sociedad las principales investigaciones multidisciplinares llevadas a cabo por el Instituto Español de Oceanografía durante su primer siglo de vida, y dar a conocer la historia del organismo, de su Sede Central y de los nueve centros oceanográficos repartidos por los litorales mediterráneo y atlántico, en la península y archipiélagos.Kongsberg 20

Synthesis, Crystal Structure, DFT Studies and Optical/Electrochemical Properties of Two Novel Heteroleptic Copper(I) Complexes and Application in DSSC

New copper(I) compounds of compositions [Cu(HL)(PPh3)2]·H2O (1) and [Cu(HL)POP]·CH2Cl2 (2), where HL = monoanion of pyridine-2,5-dicarboxylic acid, PPh3 = triphenylphosphine and POP = bis [2-(diphenylphosphine)phenyl]ether), are documented. The complexes were characterized by elemental analysis, spectroscopic techniques (IR, 1H/31P RMN and UV–VIS), cyclic voltammetry, and thermogravimetric analysis. Single-crystals for 1 and 2 enabled X-ray diffraction analysis, revealing distorted tetrahedral geometries for Cu(I) centers embedded in NOP2 environments. The crystal structures are stabilized by O−H∙∙∙O, C−H∙∙∙O, C−H∙∙∙π and π∙∙∙π interactions that were analyzed by inspection of the Hirshfeld surfaces and fingerprint plots. Compounds 1 and 2 show interesting optical/electrochemical properties, which were studied experimentally in solution by UV–Vis spectroscopy and cyclic voltammetry, as well as theoretically using Time-Dependent Density Functional Theory (TD-DFT). Additionally, in combination with the ruthenium complex N719, their efficiency as co-sensitizers in dye-sensitized solar cells (DSSCs) was assessed, showing good activity

Effects of the heterocycle and its substituents on structure and fluxionality in rhodium(I) and iridium(I) complexes with the hindered thiolates 6-tert-butylpyridine-2-thiolate and 1-alkyl-4-tert-butylimidazole-2-thiolate (alkyl = methyl and tert-butyl)

17 pages, 7 figures, 7 schemes, 5 tables.-- Supporting Information Available: http://pubs.acs.org.Three new sterically hindered heterocyclic thiolate ligands are studied (HetS = 6-tert-butylpyridine-2-thiolate, tBu-PyS; 1-methyl-4-tert-butylimidazole-2-thiolate, Me-tBu-ImS; 1,4-di-tert-butylimidazole-2-thiolate, tBu2-ImS). Related Rh(I) and Ir(I) metal complexes with molecular formulas [M(HetS)(COD)]n, [M(HetS)(CO)2]n, and [M(HetS)(CO)(PPh3)]n (where n = 1 or 2) were made to assess the steric and electronic effects of heterocycle (pyridine vs imidazole) and bulky substituents on the ring. A combination of solution-phase molecular weight determination, infrared spectroscopy, variable-temperature NMR, and solid-state X-ray diffraction studies were used to determine the molecularity of the complexes (value of n) and the coordination modes of the ligands. In the pyridine series, no evidence was found for nitrogen coordination; the presence of the tert-butyl group makes the heterocyclic thiolate behave like a nonheterocyclic derivative. In the imidazole series, three coordination modes were found, all of them including complexation through both the thiolate sulfur and the basic ring nitrogen. Evidence for fluxional and dimer−monomer interconversions was found for several of the imidazole derivatives, and the size of the 1-alkyl group played a significant role in determining the structures of the complexes.The financial support of Consejo Nacional de Ciencia y Tecnología (CONACyT, Mexico) (grant 38829-E), Ministerio de Ciencia y Tecnología (MCyT, Spain) (grant BQU2002-1729), a graduate scholarship (CONACyT) for V.M.S., and Fundación Carolina (support for V.M.S.) are acknowledged.Peer reviewe

Journal Supramolecular Chemistry

A new group of ureylbenzamide-based receptors (1–4) has been synthesized; its binding affinity and capacity to form supramolecular complexes in solution with different anions have been investigated. For designing these receptors, it was considered a combination of the positions of the urea and amide groups (ortho and meta), and the chromophore groups naphthyl and nitrophenyl, yielding four receptors. The position and chromophore structure affected the acidity of the urea and amide hydrogens in the order 4>3>2>1. All the spectroscopic studies showed a significant change of 1 and 2 compared with 3 and 4 in the presence of different TBAX salts in acetonitrile. The 1H-NMR spectra show a preferential interaction of the anions with the urea group in receptors 1 and 2 due to the less steric hindrance, while there is a cooperative interaction of amide group in receptors 3 and 4 due to the closeness of both groups.Journal Supramolecular Chemistryhttps://doi.org/10.1080/10610278.2017.135067

Selective interaction of <i>N</i>,<i>N</i>-<i>bis</i>(aminobenzyl)naphthalenediimides with fluoride anion

<p>In this work, the optical properties of <i>N</i>,<i>N</i>-<i>bis</i>(aminobenzyl)naphthalenediimides <b>2a–2d</b> (BzNDIs) and their interaction with fluoride were studied. The results demonstrated that the amino group position in the benzyl substituent exerts an effect in the absorption and emission properties. Particularly, the <i>N</i>,<i>N</i>-<i>bis</i>(2-aminobenzyl)NDI <b>2b</b> presented non-typical absorption and emission bands which indicate an intramolecular charge transfer from the amino phenyl group to the NDI core. As the concentration of <b>2b</b> increases, the solution turns from colourless to a pale orange colour. The interaction of BzNDIs <b>2a–2d</b> with anions was selective towards fluoride and the affinity was in the order <i>para</i> > <i>ortho</i> > <i>meta</i> with respect to the position of the amino group in the aminophenyl ring. Interestingly, the colour change in the solution of <b>2b</b> upon addition of fluoride makes it a good candidate for a fluoride colorimetric detection. The voltammetry analysis indicates the ability of these molecules to accept two electrons, in consequence the interaction of two fluoride anions with the BzNDIs was observed.</p

New fluorescent metal receptors based on 4,4′-carbonyl bis(carbamoylbenzoic) acid analogues with naphthalene fluorophore

<p>In this manuscript is described a research related with two ditopic receptors based on 4,4′-carbonyl bis(carbamoylbenzoic) acids bearing a naphthyl (<b>2a</b>) and naphthylmethyl fluorophores (<b>2b</b>), which interact with metal ions. The fluorescence properties of both receptors were influenced by the connectivity with the amide group. The non-spaced receptor <b>2a</b> presents an electron delocalisation from the amide to the naphthyl group having a broad red-shifted emission band and high quantum yield. The spaced receptor <b>2b</b> presented a photo-induced electron transfer (PET) process from the amide to the naphthyl group, and a structured emission band is present at the UV region with low quantum yield. The different chemical structure influenced the fluorescent response used to analyse the coordination with metallic ions. The <b>2a</b> receptor has an <i>ON</i>–<i>OFF</i> response because of the inhibition of the ICT process. The <b>2b</b> receptor shows an <i>OFF</i>–<i>ON</i> response because of the inhibition of the PET process. Additional analytical studies by ¹H-NMR and FTIR demonstrated the strong interaction of the amide and carboxylic functional groups with the metallic ions. Competitive experiments with EDTA showed that a very stable complexes are obtained between metallic ions and the new receptors.</p

Bacterial Biofilm Formation Using PCL/Curcumin Electrospun Fibers and Its Potential Use for Biotechnological Applications

Electrospun nanofibers are used for many applications due to their large surface area, mechanical properties, and bioactivity. Bacterial biofilms are the cause of numerous problems in biomedical devices and in the food industry. On the other hand, these bacterial biofilms can produce interesting metabolites. Hence, the objective of this study is to evaluate the efficiency of poly (Ɛ- caprolactone)/Curcumin (PCL/CUR) nanofibers to promote bacterial biofilm formation. These scaffolds were characterized by scanning electron microscopy (SEM), which showed homogeneous fibers with diameters between 441&ndash;557 nm; thermogravimetric analysis and differential scanning calorimetry (TGA and DSC) demonstrated high temperature resilience with degradation temperatures over &gt;350 &deg;C; FTIR and 1H-NMR serve as evidence of CUR incorporation in the PCL fibers. PCL/CUR scaffolds successfully promoted the formation of Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa biofilms. These results will be valuable in the study of controlled harvesting of pathogenic biofilms as well as in metabolites production for biotechnological purposes

Synthesis and anion recognition studies of new ureylbenzamide-based receptors

<p>A new group of ureylbenzamide-based receptors (<b>1</b>–<b>4</b>) has been synthesized; its binding affinity and capacity to form supramolecular complexes in solution with different anions have been investigated. For designing these receptors, it was considered a combination of the positions of the urea and amide groups (<i>ortho</i> and <i>meta</i>), and the chromophore groups naphthyl and nitrophenyl, yielding four receptors. The position and chromophore structure affected the acidity of the urea and amide hydrogens in the order <b>4</b>><b>3</b>><b>2</b>><b>1</b>. All the spectroscopic studies showed a significant change of <b>1</b> and <b>2</b> compared with <b>3</b> and <b>4</b> in the presence of different TBAX salts in acetonitrile. The ¹H-NMR spectra show a preferential interaction of the anions with the urea group in receptors <b>1</b> and <b>2</b> due to the less steric hindrance, while there is a cooperative interaction of amide group in receptors <b>3</b> and <b>4</b> due to the closeness of both groups.</p