Browsing by Author "Esteban-Gómez, David"

Now showing items 21-40 of 72

    • Effect of Magnetic Anisotropy on the 1H NMR Paramagnetic Shifts and Relaxation Rates of Small Dysprosium(III) Complexes 

      Harriswangler, Charlene; Lucio Martínez, Fátima; Godec, Léna; Soro, Lohona K.; Fernández-Fariña, Sandra; Valencia, Laura; Rodríguez-Rodríguez, Aurora; Esteban-Gómez, David; Charbonnière, Loïc J.; Platas-Iglesias, Carlos (American Chemical Society, 2023-08-21)
      [Abstract]: We present a detailed analysis of the 1H NMR chemical shifts and transverse relaxation rates of three small Dy(III) complexes having different symmetries (C3, D2 or C2). The complexes show sizeable emission in ...

    • 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 ...

    • Endeavor toward Redox-Responsive Transition Metal Contrast Agents Based on the Cross-Bridge Cyclam Platform 

      Uzal-Varela, Rocío; Rodríguez-Rodríguez, Aurora; Lalli, Daniela; Valencia, Laura; Maneiro, Marcelino; Botta, Mauro; Iglesias, Emilia; Esteban-Gómez, David; Angelovski, Goran; Platas-Iglesias, Carlos (American Chemical Society, 2024-01-10)
      [Abstract]: 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 ...

    • 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 ...

    • 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 ...

    • Exploring the use of rigid 18-membered macrocycles with amide pendant arms for Pb(II)-based radiopharmaceuticals 

      Harriswangler, Charlene; McNeil, Brooke L.; Brandariz, Isabel; Lucio Martínez, Fátima; Valencia, Laura; Esteban-Gómez, David; Ramogida, Caterina; Platas-Iglesias, Carlos (Frontiers Journal portfolio (Chinese Chemical Society, Royal Society of Chemistry), 2023-12-28)
      [Abstract]: We report a detailed investigation on the use of chelators PYTAM, H4PYTAMGly, CHX-PYTAM and H4CHX-PYTAMGly for the complexation of Pb(II)-radioisotopes with potential use in the preparation of radiopharmaceuticals. ...

    • 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 ...

    • Incorporation of Carboxylate Pendant Arms into 18-Membered Macrocycles: Effects on [nat/203Pb]Pb(II) Complexation 

      Harriswangler, Charlene; McNeil, Brooke L.; Brandariz, Isabel; Valencia, Laura; Esteban-Gómez, David; Ramogida, Caterina; Platas-Iglesias, Carlos (Wiley-VCH, 2024-03-11)
      [Abstract]: We present a detailed investigation on the coordination chemistry of [nat/203Pb]Pb(II) with chelators H4PYTA and H4CHX-PYTA. These chelators belong to the family of ligands derived from the 18-membered macrocyclic ...

    • 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 ...

    • 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 ...

    • Magnetic and relaxation properties of vanadium(IV) complexes: an integrated 1H relaxometric, EPR and computational study 

      Lagostina, Valeria; Carniato, Fabio; Esteban-Gómez, David; Platas-Iglesias, Carlos; Chiesa, Mario; Botta, Mauro (Frontiers Journal portfolio (Chinese Chemical Society, Royal Society of Chemistry), 2023-01-20)
      [Abstract]: We report a detailed study of the magnetic and relaxation properties of a series of oxovanadium(IV) complexes comprising the aqua ion [VO(H2O)5]2+ and [VO(ox)2]2− (ox = oxalate), [VO(nta)]− (nta = nitrilotriacetate), ...

    • Magnetic anisotropies in rhombic lanthanide(III) complexes do not conform to Bleaney’s theory 

      Castro, Goretti; Regueiro-Figueroa, Martín; Esteban-Gómez, David; Pérez-Lourido, Paulo; Platas-Iglesias, Carlos; Valencia, Laura (American Chemical Society, 2016-04-04)
      [Abstract] We report a complete set of magnetic susceptibilities of lanthanide complexes with a macrocyclic ligand based on a 3,6,10,13-tetraaza-1,8(2,6)-dipyridinacyclotetradecaphane platform containing four hydroxyethyl ...