Listar por autor "Platas-Iglesias, Carlos"
Mostrando ítems 21-40 de 81
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Diimidazolium Halobismuthates [Dim]2[Bi2X10] (X = Cl–, Br–, or I–): A New Class of Thermochromic and Photoluminescent Materials
García-Fernández, Alberto; Marcos-Cives, Ismael; Platas-Iglesias, Carlos; Castro-García, Socorro; Vázquez, Digna; Fernández, Alberto; Sánchez-Andújar, Manuel (American Chemical Society (ACS), 2018-06-12)[Abstract] We present a novel family of polyhalide salts of Bi(III) with the general formula [Dim]2[Bi2X10], where Dim2+ is the diimidazolium cation (C9H14N4)2+ and X is Cl–, Br–, or I–. Single-phase materials are easily ... -
Dimer formation of GdDO3A-arylsulfonamide complexes causes loss of pH-dependency of relaxivity
Wacker, Anja; Carniato, Fabio; Platas-Iglesias, Carlos; Esteban-Gómez, David; Wester, Hans-Jürgen; Tei, Lorenzo; Notni, Johannes (Royal Society of Chemistry, 2017-11-06)[Abstract] Gadolinium(III) complexes with pH-dependent relaxivities have been proposed as responsive magnetic resonance imaging (MRI) contrast agents (CA) for mapping of pH value in living subjects. The latter is clinically ... -
Ditopic receptors containing urea groups for solvent extraction of Cu(II) salts
Carreira-Barral, Israel; Mato-Iglesias, Marta; Blas, Andrés de; Platas-Iglesias, Carlos; Tasker, Peter A.; Esteban-Gómez, David (Royal Society of Chemistry, 2017-02-15)[Abstract] The ditopic receptor L3 [1-(2-((7-(4-(tert-butyl)benzyl)-1,4,7,10-tetraazacyclododecan-1-yl)methyl)phenyl)-3-(3-nitrophenyl)urea] containing a macrocyclic cyclen unit for Cu(II)-coordination and a urea moiety ... -
Effects of the substituents of pyrazole/thiazine ligands on the magnetic properties of chloro-bridged Cu(II) complexes
Torres-García, Pablo; Luna-Giles, Francisco; Bernalte-García, Álvaro; Platas-Iglesias, Carlos; Esteban-Gómez, David; Viñuelas-Zahínos, Emilio (Royal Society of Chemistry, 2017-09-07)[Abstract] We have synthesised and characterised the dimeric copper(II) complexes [{CuCl(PzTz)}2(μ-Cl)2], [{CuCl(DMPzTz)}2(μ-Cl)2] and [{CuCl(DPhPzTz)}2(μ-Cl)2] and the monomeric complex [CuCl2(DMPzTz)] (PzTz = ... -
Electronic versus steric control in palladium complexes of carboranyl phosphine-iminophosphorane ligands
Rodríguez-Rey, José Luis; Esteban-Gómez, David; Platas-Iglesias, Carlos; Sousa-Pedrares, Antonio (Royal Society of Chemistry, 2018-11-30)[Abstract] A new family of carboranyl phosphine-iminophosphorane ligands was prepared and characterized. The new ligands present a carboranyl group directly attached to the iminophosphorane nitrogen atom through a cage ... -
endo- versus exo-Cyclic coordination in copper complexes with methylthiazolylcarboxylate tacn derivatives
Guillou, Amaury; Lima, Luís M. P.; Esteban-Gómez, David; Delgado, Rita; Platas-Iglesias, Carlos; Patinec, Véronique; Tripier, Raphaël (Royal Society of Chemistry, 2019-05-17)[Abstract] Three tacn (1,4,7-triazacyclononane)-based ligands substituted by methylthiazolylcarboxylate (tha) and/or methylthiazolyl (th) arms have been examined for copper complexation with the aim to study the impact of ... -
Europium(III) Macrocyclic Chelates Appended with Tyrosine-based Chromophores and Di-(2-picolyl)amine-based Receptors: Turn-On Luminescent Chemosensors Selective to Zinc(II) Ions
Wang, Gaoji; Platas-Iglesias, Carlos; Angelovski, Goran (Wiley, 2020-01-22)[Abstract] Zinc ions play an important role in many biological processes in the human body. To selectively detect Zn²⁺, two EuDO3A‐based complexes (DO3A=1,4,7,10‐tetraazacyclododecane‐1,4,7‐tricarboxylic acid) appended ... -
Exceptionally inert lanthanide(III) PARACEST MRI contrast agents based on an 18-membered macrocyclic platform
Castro, Goretti; Regueiro-Figueroa, Martín; Esteban-Gómez, David; Bastida, Rufina; Macías, Alejandro; Pérez-Lourido, Paulo; Platas-Iglesias, Carlos; Valencia, Laura (Wiley, 2015-12-14)[Abstract] We report a macrocyclic ligand based on a 3,6,10,13-tetraaza-1,8(2,6)-dipyridinacyclotetradecaphane platform containing four hydroxyethyl pendant arms (L1) that forms extraordinary inert complexes with Ln3+ ions. ... -
Expanding the Ligand Classes Used for Mn(II) Complexation: Oxa-aza Macrocycles Make the Difference
Kálmán, Ferenc; Nagy, Viktória; Uzal-Varela, Rocío; Pérez-Lourido, Paulo; Esteban-Gómez, David; Garda, Zoltán; Pota, Kristof; Mezei, Roland; Pallier, Agnès; Tóth, Éva; Platas-Iglesias, Carlos; Tircsó, Gyula (MDPI, 2021-03-10)[Abstract] We report two macrocyclic ligands based on a 1,7-diaza-12-crown-4 platform functionalized with acetate (𝑡O2DO2A²⁻) or piperidineacetamide (𝑡O2DO2AMᴾⁱᵖ) pendant arms and a detailed characterization of the ... -
Gd3+-based magnetic resonance imaging contrast agent responsive to Zn2+
Regueiro-Figueroa, Martín; Gündüz, Serhat; Patinec, Véronique; Logothetis, Nikos K.; Esteban-Gómez, David; Tripier, Raphaël; Angelovski, Goran; Platas-Iglesias, Carlos (American Chemical Society, 2015-10-15)[Abstract] We report the heteroditopic ligand H5L, which contains a DO3A unit for Gd3+ complexation connected to an NO2A moiety through a N-propylacetamide linker. The synthesis of the ligand followed a convergent route ... -
High relaxivity Mn2+-based MRI contrast agents
Regueiro-Figueroa, Martín; Rolla, Gabriele A.; Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Botta, Mauro; Platas-Iglesias, Carlos (Wiley, 2014-12-16)[Abstract] Stable Mn2+ mono- and binuclear complexes containing pentadentate 6,6′-((methylazanediyl)bis(methylene)) dipicolinic acid coordinating units give remarkably high relaxivities due to the presence of two inner-sphere ... -
Highly relaxing gadolinium based MRI contrast agents responsive to Mg2+ sensing
Abada, Sabah; Lecointre, Alexandre; Elhabiri, Mourad; Esteban-Gómez, David; Platas-Iglesias, Carlos; Tallec, Gaylord; Mazzanti, Marinella; Charbonnière, Loïc J. (Royal Society of Chemistry, 2012-04-28)[Abstract] A Gd complex based on a polyphosphonated pyridyl ligand shows a very high stability in aqueous solution (logKEuL = 25.7), a high relaxivity (8.5 mM−1 s−1 at 25 °C and 20 MHz) and a marked and selective relaxivity ... -
Highly stable complexes of divalent metal ions (Mg2+, Ca2+, Cu2+, Zn2+, Cd2+, and Pb2+) with a dota‐like ligand containing a picolinate pendant
Regueiro-Figueroa, Martín; Ruscsák, Erika; Fra, Laura; Tircsó, Gyula; Tóth, Imre; Blas, Andrés de; Rodríguez-Blas, Teresa; Platas-Iglesias, Carlos; Esteban-Gómez, David (Wiley, 2014-12)[Abstract] The stability constants of complexes of the macrocyclic ligand do3a‐pic4– (H4do3a‐pic = 2,2′,2″‐{10‐[(6‐carboxypyridin‐2‐yl)methyl]‐1,4,7,10‐tetraazacyclododecane 1,4,7‐triyl}triacetic acid) with several divalent ... -
Hyperfine coupling constants on inner‐sphere water molecules of GdIII‐based MRI contrast agents
Esteban-Gómez, David; Blas, Andrés de; Rodríguez-Blas, Teresa; Helm, Lothar; Platas-Iglesias, Carlos (Wiley, 2012-11-02)[Abstract] Herein we present a theoretical investigation of the hyperfine coupling constants (HFCCs) on the inner‐sphere water molecules of [Gd(H2O)8]3+ and different GdIII‐based magnetic resonance imaging contrast agents ... -
Importance of outer-sphere and aggregation phenomena in the relaxation properties of phosphonated gadolinium complexes with potential applications as MRI contrast agents
Elhabiri, Mourad; Abada, Sabah; Sy, Mohamadou; Nonat, Aline; Choquet, Philippe; Esteban-Gómez, David; Cassino, Claudio; Platas-Iglesias, Carlos; Botta, Mauro; Charbonnière, Loïc J. (Wiley, 2015-04-10)[Abstract] A series composed of a tetra-, a tris- and a bisphosphonated ligand based on a pyridine scaffold (L4, L3 and L2, respectively) was studied within the frame of lanthanide (Ln) coordination. The stability constants ... -
In-depth study of a novel class of ditopic gadolinium(III)-based MRI probes sensitive to zwitterionic neurotransmitters
Toljic, Djordje; Platas-Iglesias, Carlos; Angelovski, Goran (Frontiers, 2019-07-24)[Abstract] The efficacy of Gd-based low-molecular weight ditopic MRI probes on binding zwitterionic neurotransmitters (ZNTs) relies on their structural compatibility. ZNTs are challenging biomarkers for monitoring chemical ... -
Inert macrocyclic Eu3+ complex with affirmative paraCEST features
Gambino, Tanja; Valencia, Laura; Pérez-Lourido, Paulo; Esteban-Gómez, David; Zaiss, Moritz; Platas-Iglesias, Carlos; Angelovski, Goran (Royal Society of Chemistry, 2020-06-21)[Abstract]: We report on a macrocyclic platform based on an 18-membered macrocycle that forms kinetically highly inert paramagnetic complexes and possesses an excellent outlook for the development of bioresponsive paraCEST ... -
Investigations into the effects of linker length elongation on the behaviour of calcium-responsive MRI probes
Connah, Liam; Truffault, Vincent; Platas-Iglesias, Carlos; Angelovski, Goran (Royal Society of Chemistry, 2019-07-25)[Abstract] Understanding the relationship between chemical structure and the effectiveness of bioresponsive magnetic resonance imaging (MRI) contrast agents can offer help to identify key components required for the future ... -
Lead(II) complexes of lateral macrobicyclic receptors that incorporate a crown moiety and a pyridine head unit
Esteban-Gómez, David; Enríquez-Pérez, Teresa; Ferreirós-Martínez, Raquel; Mato-Iglesias, Marta; Platas-Iglesias, Carlos; Blas, Andrés de; Rodríguez-Blas, Teresa (Wiley, 2010-11)[Abstract] The coordinative properties towards lead(II) of two lateral macrobicyclic receptors that incorporate either a 1,10‐diaza‐[15]crown‐5 (L7) or a 4,13‐diaza‐[18]crown‐6 (L8) fragment are reported. Spectrophotometric ... -
Macrocyclic receptor showing improved PbII/ZnII and PbII/CaII selectivities
Ferreirós-Martínez, Raquel; Platas-Iglesias, Carlos; Blas, Andrés de; Esteban-Gómez, David; Rodríguez-Blas, Teresa (Wiley, 2010-05-31)[Abstract] Herein we report on the macrocyclic receptor N,N′‐bis[(6‐carboxy‐2‐pyridyl)methyl]‐1,10‐diaza‐15‐crown‐5 (H2bp15c5) and its coordination properties towards ZnII, CdII, PbII, and CaII. The stability constants of ...