Listar por autor "Esteban-Gómez, David"
Mostrando ítems 41-60 de 64
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Recognition of AMP, ADP and ATP through cooperative binding by Cu(II) and Zn(II) complexes containing urea and/or phenylboronic acid moieties
Carreira-Barral, Israel; Fernández-Pérez, María-Isabel; Mato-Iglesias, Marta; Blas, Andrés de; Platas-Iglesias, Carlos; Esteban-Gómez, David (MDPI, 2018)[Abstract] We report a series of Cu(II) and Zn(II) complexes with different ligands containing a dipicolyl unit functionalized with urea groups that may contain or not a phenylboronic acid function. These complexes were ... -
Reinforced Ni(ɪɪ)-Cyclam Derivatives as Dual ¹H/¹⁹F MRI Probes
Pujales-Paradela, Rosa; Savic, Tanja; Brandariz, Isabel; Pérez-Lourido, Paulo; Angelovski, Goran; Esteban-Gómez, David; Platas-Iglesias, Carlos (Royal Society of Chemistry, 2019-03-11)[Abstract] Reinforced cross-bridged Ni²⁺-cyclam complexes were functionalised with pendant arms containing both amide protons and CF₃ groups that lead to a dual ¹H/¹⁹F response. The resulting complexes possess very high ... -
Rigidified Derivative of the Non-macrocyclic Ligand H₄OCTAPA for Stable Lanthanide(III) Complexation
Lucio Martínez, Fátima; Garda, Zoltán; Váradi, Balázs; Kálmán, Ferenc; Esteban-Gómez, David; Tóth, Éva; Tircsó, Gyula; Platas-Iglesias, Carlos (American Chemical Society, 2022-03-11)[Abstract] The stability constants of lanthanide complexes with the potentially octadentate ligand CHXOCTAPA4–, which contains a rigid 1,2-diaminocyclohexane scaffold functionalized with two acetate and two picolinate ... -
Self‐aggregated dinuclear lanthanide(III) complexes as potential bimodal probes for magnetic resonance and optical imaging
Regueiro-Figueroa, Martín; Nonat, Aline; Rolla, Gabriele A.; Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Charbonnière, Loïc J.; Botta, Mauro; Platas-Iglesias, Carlos (Wiley, 2013-08-26)[Abstract] Homodinuclear lanthanide complexes (Ln=La, Eu, Gd, Tb, Yb and Lu) derived from a bis‐macrocyclic ligand featuring two 2,2′,2′′‐(1,4,7,10‐tetraazacyclododecane‐1,4,7 triyl)triacetic acid chelating sites linked ... -
Solid state and solution structures of alkaline-earth complexes with lariat ethers containing aniline and benzimidazole pendants
Rodríguez-Rodríguez, Aurora; Carreira-Barral, Israel; Regueiro-Figueroa, Martín; Esteban-Gómez, David; Platas-Iglesias, Carlos; Blas, Andrés de; Rodríguez-Blas, Teresa (Elsevier, 2012-01-04)[Abstract] Herein we report the synthesis and structural characterization of Mg(II), Ca(II), Sr(II) and Ba(II) complexes with bibracchial lariat ethers derived from 1,7-diaza-15-crown-5 and 1,7-diaza-12-crown-4 containing ... -
Solution-State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers
Avecilla, Fernando; Soro, Lohona K.; Knighton, Richard C.; Thor, Waygen; Przybilla, Frédéric; Jeannin, Olivier; Esteban-Gómez, David; Platas-Iglesias, Carlos; Charbonnière, Loïc J. (Wiley, 2023)[Abstract] Two homometallic ytterbium dimers are prepared and their solution-state photoluminescence and upconversion properties are investigated. Both complexes exhibit two-photon cooperative luminescence upconversion in ... -
Spectrally undiscerned isomers might lead to erroneous determination of water exchange rates of paraCEST Eu(III) agents
Cakic, Nevenka; Tickner, Ben; Zaiss, Moritz; Esteban-Gómez, David; Platas-Iglesias, Carlos; Angelovski, Goran (American Chemical Society, 2017-07-17)[Abstract] We report a detailed study of the solution structure and water exchange rate of a Eu(III) complex with the cyclen-based ligand L1, containing (S)-2-(2-acetamido)-3-(4 (trifluoromethyl)phenyl)propanoate pendant ... -
Spectroscopic properties of a family of mono‐ to trinuclear lanthanide complexes
Sy, Mohamadou; Esteban-Gómez, David; Platas-Iglesias, Carlos; Rodríguez-Rodríguez, Aurora; Tripier, Raphaël; Charbonnière, Loïc J. (Wiley, 2017-04-10)[Abstract] A series of mono‐, di‐, and trinuclear complexes of Eu and Tb was designed to study the influence of the number of Ln emitting centers on the luminescence properties of discrete polynuclear complexes. The complexes ... -
Stable Mn2+, Cu2+ and Ln3+ complexes with cyclen-based ligands functionalized with picolinate pendant arms
Rodríguez-Rodríguez, Aurora; Garda, Zoltán; Ruscsák, Erika; Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Lima, Luís M. P.; Beyler, Maryline; Tripier, Raphaël; Tircsó, Gyula; Platas-Iglesias, Carlos (Royal Society of Chemistry, 2015-01-20)[Abstract] In this study we present the results of the equilibrium, dissociation kinetics, DFT and X - ray crystallographic studies performed on the complexes of metal ions of biomedical importance (Mn 2+ , Cu 2+ and ... -
Sulphur-rich functionalized calix[4]arenes for selective complexation of Hg2+ over Cu2+, Zn2+ and Cd2+
Bensenane, Bachir; Asfari, Zouhair; Platas-Iglesias, Carlos; Esteban-Gómez, David; Djafri, Fatiha; Elhabiri, Mourad; Charbonnière, Loïc J. (Royal Society of Chemistry, 2016-08-16)[Abstract] The syntheses of two new ligands based on a calix[4]arene scaffold in the cone conformation functionalized on the phenolic positions 1 and 3 by diethylthiophosphonates (L1) or tetra(tri)thioethyleneglycol (L2) ... -
Synthesis and Structural Analysis of Push-Pull Imidazole-Triazole Based Fluorescent Bifunctional Chemosensor for CU2+ and FE2+ Detection
Da Lama Vázquez, Ana; Pérez Sestelo, José; Valencia, Laura; Esteban-Gómez, David; Sarandeses, Luis A.; Martínez, Montserrat (Elsevier, 2022-07)[Abstract] Fluorescent imidazole-triazole based ligands L1 and L2 have been designed as chemical push-pull chemosensors for divalent metal ions and synthesized through palladium-catalyzed cross-coupling reactions using ... -
The effect of ring size variation on the structure and stability of lanthanide(III) complexes with crown ethers containing picolinate pendants
Roca Sabio, Adrián; Mato-Iglesias, Marta; Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Platas-Iglesias, Carlos (Royal Society of Chemistry, 2011-01-14)[Abstract] The coordination properties of the macrocyclic receptor N,N′-bis[(6-carboxy-2-pyridyl)methylene]-1,10-diaza-15-crown-5 (H2bp15c5) towards the lanthanide ions are reported. Thermodynamic stability constants were ... -
The relationship between NMR chemical shifts of thermally polarized and hyperpolarized 89Y complexes and their solution structures
Xing, Yixun; Jindal, Ashish K.; Regueiro-Figueroa, Martín; Le Fur, Mariane; Kervarec, Nelly; Zhao, Piyu; Kovacs, Zoltan; Valencia, Laura; Pérez-Lourido, Paulo; Tripier, Raphaël; Esteban-Gómez, David; Platas-Iglesias, Carlos; Sherry, A. Dean (Wiley, 2016-11-07)[Abstract] Recently developed dynamic nuclear polarization (DNP) technology offers the potential of increasing the NMR sensitivity of even rare nuclei for biological imaging applications. Hyperpolarized 89Y is an ideal ... -
The role of ligand to metal charge-transfer states on the luminescence of Europium complexes with 18-membered macrocyclic ligands
Nonat, Aline; Esteban-Gómez, David; Valencia, Laura; Pérez-Lourido, Paulo; Barriada, José Luis; Charbonnière, Loïc J.; Platas-Iglesias, Carlos (Royal Society of Chemistry, 2019-02-27)[Abstract] We report a detailed study of the photophysical properties of EuIII and TbIII complexes with two ligands based on a 3,6,10,13-tetraaza-1,8(2,6)-dipyridinacyclotetradecaphane platform containing either four ... -
The role of the capping bond effect on pyclen natY3+/90Y3+ chelates: full control of the regiospecific N-functionalization makes the difference
Le Fur, Mariane; Beyler, Maryline; Molnár, Enikö; Fougère, Olivier; Esteban-Gómez, David; Tircsó, Gyula; Platas-Iglesias, Carlos; Lepareur, Nicolas; Rousseaux, Olivier; Tripier, Raphaël (Royal Society of Chemistry, 2017-09-07)[Abstract] Thanks to a smart regiospecific N-functionalization, a pyclen based ligand bearing one picolinate and two acetate arms organized in a dissymmetric manner was synthesized for Y3+ complexation, and compared to its ... -
Thermodynamic Stability of Mn(II) Complexes with Aminocarboxylate Ligands Analyzed Using Structural Descriptors
Uzal-Varela, Rocío; Pérez-Fernández, Francisco; Valencia, Laura; Rodríguez-Rodríguez, Aurora; Platas-Iglesias, Carlos; Caravan, Peter; Esteban-Gómez, David (ACS, 2022-08-22)[Abstract] We present a quantitative analysis of the thermodynamic stabilities of Mn(II) complexes, defined by the equilibrium constants (log KMnL values) and the values of pMn obtained as −log[Mn]free for total metal and ... -
Transient versus static electron spin relaxation in Mn2+ complexes relevant as MRI contrast agents
Platas-Iglesias, Carlos; Esteban-Gómez, David; Helm, Lothar; Regueiro-Figueroa, Martín (American Chemical Society, 2016-08-18)[Abstract] The zero-field splitting (ZFS) parameters of the [Mn(EDTA)(H2O)]2–·2H2O and [Mn(MeNO2A)(H2O)]·2H2O systems were estimated by using DFT and ab initio CASSCF/NEVPT2 calculations (EDTA = 2,2′,2″,2‴-(ethane-1,2-di ... -
Tuning the copper(II) coordination properties of cyclam by subtle chemical modifications
Camus, Nathalie; Le Bris, Nathalie; Nuryyeva, Selbi; Chessé, Matthieu; Esteban-Gómez, David; Platas-Iglesias, Carlos; Tripier, Raphaël; Elhabiri, Mourad (Royal Society of Chemistry, 2017-09-14)[Abstract] The acid–base and copper(II) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical ... -
Understanding stability trends along the lanthanide series
Regueiro-Figueroa, Martín; Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Platas-Iglesias, Carlos (Wiley, 2014-04-01)[Abstract] The stability trends across the lanthanide series of complexes with the polyaminocarboxylate ligands TETA4− (H4TETA=2,2′,2′′,2′′′‐(1,4,8,11 tetraazacyclotetradecane‐1,4,8,11‐tetrayl)tetraacetic acid), BCAED4− ... -
Understanding the Effect of the Electron Spin Relaxation on the Relaxivities of Mn(II) Complexes with Triazacyclononane Derivatives
Uzal-Varela, Rocío; Valencia, Laura; Lalli, Daniela; Maneiro, Marcelino; Esteban-Gómez, David; Platas-Iglesias, Carlos; Botta, Mauro; Rodríguez-Rodríguez, Aurora (American Chemical Society, 2021-10-07)[Abstract] 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 ...