1
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Nucera A, Platas-Iglesias C, Carniato F, Botta M. Effect of hydration equilibria on the relaxometric properties of Gd(III) complexes: new insights into old systems. Dalton Trans 2023; 52:17229-17241. [PMID: 37955945 DOI: 10.1039/d3dt03413e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
We present a detailed relaxometric and computational investigation of three Gd(III) complexes that exist in solution as an equilibrium of two species with a different number of coordinated water molecules: [Gd(H2O)q]3+ (q = 8, 9), [Gd(EDTA)(H2O)q]- and [Gd(CDTA)(H2O)q]- (q = 2, 3). 1H nuclear magnetic relaxation dispersion (NMRD) data were recorded from aqueous solutions of these complexes using a wide Larmor frequency range (0.01-500 MHz). These data were complemented with 17O transverse relaxation rates and chemical shifts recorded at different temperatures. The simultaneous fit of the NMRD and 17O NMR data was guided by computational studies performed at the DFT and CASSCF/NEVPT2 levels, which provided information on Gd⋯H distances, 17O hyperfine coupling constants and the zero-field splitting (ZFS) energy, which affects electronic relaxation. The hydration equilibrium did not have a very important effect in the fits of the experimental data for [Gd(H2O)q]3+ and [Gd(CDTA)(H2O)q]-, as the hydration equilibrium is largely shifted to the species with the lowest hydration number (q = 8 and 2, respectively). The quality of the analysis improves however considerably for [Gd(EDTA)(H2O)q]- upon considering the effect of the hydration equilibrium. As a result, this study provides for the first time an analysis of the relaxation properties of this important model system, as well as accurate parameters for [Gd(H2O)q]3+ and [Gd(CDTA)(H2O)q]-.
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Affiliation(s)
- Alessandro Nucera
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy.
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2
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Lucio-Martínez F, Garda Z, Váradi B, Kálmán FK, Esteban-Gómez D, Tóth É, Tircsó G, Platas-Iglesias C. Rigidified Derivative of the Non-macrocyclic Ligand H 4OCTAPA for Stable Lanthanide(III) Complexation. Inorg Chem 2022; 61:5157-5171. [PMID: 35275621 PMCID: PMC8965877 DOI: 10.1021/acs.inorgchem.2c00501] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
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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 pendant arms, reveal the formation
of stable complexes [log KLaL = 17.82(1)
and log KYbL = 19.65(1)]. Luminescence
studies on the Eu3+ and Tb3+ analogues evidenced
rather high emission quantum yields of 3.4 and 11%, respectively.
The emission lifetimes recorded in H2O and D2O solutions indicate the presence of a water molecule coordinated
to the metal ion. 1H nuclear magnetic relaxation dispersion
profiles and 17O NMR chemical shift and relaxation measurements
point to a rather low water exchange rate of the coordinated water
molecule (kex298 = 1.58 ×
106 s–1) and relatively high relaxivities
of 5.6 and 4.5 mM–1 s–1 at 20
MHz and 25 and 37 °C, respectively. Density functional theory
calculations and analysis of the paramagnetic shifts induced by Yb3+ indicate that the complexes adopt an unprecedented cis geometry
with the two picolinate groups situated on the same side of the coordination
sphere. Dissociation kinetics experiments were conducted by investigating
the exchange reactions of LuL occurring with Cu2+. The
results confirmed the beneficial effect of the rigid cyclohexyl group
on the inertness of the Lu3+ complex. Complex dissociation
occurs following proton- and metal-assisted pathways. The latter is
relatively efficient at neutral pH, thanks to the formation of a heterodinuclear
hydroxo complex. A
non-macrocyclic ligand containing a rigid cyclohexyl spacer
forms thermodynamically stable complexes with the lanthanide(III)
ions in aqueous solution. The complexes also show remarkable kinetic
inertness, though a structural change facilitates dissociation through
the metal-assisted mechanism for the small lanthanides. The Gd(III)
complex displays a relatively high relaxivity due to the presence
of a water molecule coordinated to the metal ion, while the Eu(III)
and Tb(III) analogues display strong metal-centered luminescence.
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Affiliation(s)
- Fátima Lucio-Martínez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Zoltán Garda
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
| | - Balázs Váradi
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary.,Doctoral School of Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
| | - Ferenc Krisztián Kálmán
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, rue Charles Sadron, 45071 Orléans, Cedex 2, France
| | - Gyula Tircsó
- Department of Physical Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
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3
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Lalli D, Carniato F, Tei L, Platas-Iglesias C, Botta M. Surprising Complexity of the [Gd(AAZTA)(H 2O) 2] - Chelate Revealed by NMR in the Frequency and Time Domains. Inorg Chem 2021; 61:496-506. [PMID: 34890182 PMCID: PMC8753608 DOI: 10.1021/acs.inorgchem.1c03194] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
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Typically, Ln(III)
complexes are isostructural along the series,
which enables studying one particular metal chelate to derive the
structural features of the others. This is not the case for [Ln(AAZTA)(H2O)x]− (x = 1, 2) systems, where structural variations along the
series cause changes in the hydration number of the different metal
complexes, and in particular the loss of one of the two metal-coordinated
water molecules between Ho and Er. Herein, we present a 1H field-cycling relaxometry and 17O NMR study that enables
accessing the different exchange dynamics processes involving the
two water molecules bound to the metal center in the [Gd(AAZTA)(H2O)2]− complex. The resulting
picture shows one Gd-bound water molecule with an exchange rate ∼6
times faster than that of the other, due to a longer metal–water
distance, in accordance with density functional theory (DFT) calculations.
The substitution of the more labile water molecule with a fluoride
anion in a diamagnetic-isostructural analogue of the Gd-complex, [Y(AAZTA)(H2O)2]−, allows us to follow the
chemical exchange process by high-resolution NMR and to describe its
thermodynamic behavior. Taken together, the variety of tools offered
by NMR (including high-resolution 1H, 19F NMR
as a function of temperature, 1H longitudinal relaxation
rates vs B0, and 17O transverse
relaxation rates vs T) provides a complete description
of the structure and exchange dynamics of these Ln-complexes along
the series. Herein, we present a 1H field−cycling
relaxometry and 17O NMR study that enables accessing the
different exchange dynamics processes involving the two water molecules
bound to the metal center in the [Gd(AAZTA)(H2O)2]− complex.
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Affiliation(s)
- Daniela Lalli
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Lorenzo Tei
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Galicia, Spain
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy.,Magnetic Resonance Platform (PRISMA-UPO), Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
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4
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Uzal-Varela R, Lalli D, Brandariz I, Rodríguez-Rodríguez A, Platas-Iglesias C, Botta M, Esteban-Gómez D. Rigid versions of PDTA 4- incorporating a 1,3-diaminocyclobutyl spacer for Mn 2+ complexation: stability, water exchange dynamics and relaxivity. Dalton Trans 2021; 50:16290-16303. [PMID: 34730583 DOI: 10.1039/d1dt02498a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Rigid derivatives of the acyclic ligand PDTA4- (H4PDTA = propylenediamine-N,N,N',N'-tetraacetic acid) were prepared by functionalization of a 1,3-diaminocyclobutyl spacer. The new ligands contain either four acetate groups attached to the central scaffold (H4L1) or incorporate pyridyl (H2L2) or propylamide (H2L3) units replacing two of the carboxylate groups. The ligand protonation constants and the stability constants of their Mn2+ complexes were determined using potentiometric and spectrophotometric titrations. The stability of the [Mn(L1)]2- complex was found to be significantly higher than that of the flexible [Mn(PDTA)]2- derivative (log KMnL = 10.78 and 10.01, respectively). A detailed study of the 1H Nuclear Magnetic Relaxation Dispersion (NMRD) profiles and 17O NMR measurements evidence that the [Mn(L1)]2- and [Mn(L2)] complexes display a hydration equilibrium in solution involving a seven-coordinate species with an inner-sphere water molecule and a six-coordinate species that lacks a coordinated water molecule. As a result the 1H relaxivities of these complexes are somewhat lower than that of [Mn(EDTA)]2- and related systems. The introduction of propylamide groups in [Mn(L3)] shifts the hydration equilibrium to the seven-coordinate species, which results in a 1H relaxivity (r1p = 3.7 mM-1 s-1 at 22 MHz and 25 °C) exceeding that of [Mn(EDTA)]2- (r1p = 3.3 mM-1 s-1 at 22 MHz and 25 °C). The parameters that control the relaxivities in this family of complexes were determined by simultaneous fitting of the experimental 1H NMRD and 17O NMR data (transverse relaxation rates and chemical shifts), with the aid of computational studies performed at the DFT and CASSCF/NEVPT2 levels. These studies provide detailed insight of the parameters that control the efficiency of these relaxation agents at the molecular level.
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Affiliation(s)
- Rocío Uzal-Varela
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Daniela Lalli
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Isabel Brandariz
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Aurora Rodríguez-Rodríguez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Mauro Botta
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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5
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Janicki R, Starynowicz P. Analysis of charge density in nonaaquagadolinium(III) trifluoromethanesulfonate - insight into Gd III-OH 2 bonding. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:572-580. [PMID: 32831276 DOI: 10.1107/s2052520620006903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
The experimental charge-density distribution in [Gd(H2O)9](CF3SO3)3 has been analysed and compared with the theoretical density functional theory calculations. Although the Gd-OH2 bonds are mainly ionic, a covalent contribution is detectable when inspecting both the topological parameters of these bonds and the natural bond orbital results. This contribution originates from small electron transfer from the lone pairs of oxygen atoms to empty 5d and 6s spin orbitals of Gd3+.
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Affiliation(s)
- Rafał Janicki
- Wydział Chemii, Uniwersytet Wrocławski, ul. F. Joliot-Curie 14, Wrocław, 50-383, Poland
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6
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Frías JC, Soriano J, Blasco S, García-España E, Rodríguez-Rodríguez A, Esteban-Gómez D, Carniato F, Botta M, Platas-Iglesias C, Albelda MT. Macrocyclic Pyclen-Based Gd 3+ Complex with High Relaxivity and pH Response. Inorg Chem 2020; 59:7306-7317. [PMID: 32379437 DOI: 10.1021/acs.inorgchem.0c00690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report the synthesis and characterization of the macrocyclic ligand 2,2'-((2-(3,9-bis(carboxymethyl)-3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-6-yl)ethyl)azanediyl)diacetic acid (H4L) and several of its complexes with lanthanide ions. The structure of the free ligand was determined using X-ray diffraction measurements. Two N atoms of the pyclen moiety in the trans position are protonated in the solid state, together with the exocyclic N atom and one of the carboxylate groups of the ligand. The relaxivity of the Gd3+ complex was found to increase from 6.7 mM-1 s-1 at pH 8.6 to 8.5 mM-1 s-1 below pH ≈ 6.0. Luminescence lifetime measurements recorded from H2O and D2O solutions of the Eu3+ complex evidence the presence of a single complex species in solution at low pH (∼5.0) that contains two inner-sphere water molecules. DFT calculations suggest that the coordination environment of the Ln3+ ion is fulfilled by the four N atoms of the pyclen unit, two oxygen atoms of the macrocyclic acetate groups, and an oxygen atom of an exocyclic carboxylate group. The two inner-sphere water molecules complete coordination number nine around the metal ion. At high pH (∼9.3), the lifetime of the excited 5D0 level of Eu3+ displays a biexponential behavior that can be attributed to the presence of two species in solution with hydration numbers of q = 0 and q = 1. The 1H NMR and DOSY spectra recorded from solutions of the Eu3+ and Y3+ complexes reveal a structural change triggered by pH and the formation of small aggregates at high pH values.
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Affiliation(s)
- Juan C Frías
- Departamento de Ciencias Biomédicas, Universidad CEU-Cardenal Herrera, CEU Universities, C/Ramón y Cajal, s/n, 46115 Alfara del Patriarca, Valencia, Spain
| | - José Soriano
- Departamento de Quı́mica Inorgánica, Instituto de Ciencia Molecular, Universidad de Valencia, Edificio de Institutos de Paterna, Apdo 22085, 46071 Valencia, Spain
| | - Salvador Blasco
- Departamento de Quı́mica Inorgánica, Instituto de Ciencia Molecular, Universidad de Valencia, Edificio de Institutos de Paterna, Apdo 22085, 46071 Valencia, Spain
| | - Enrique García-España
- Departamento de Quı́mica Inorgánica, Instituto de Ciencia Molecular, Universidad de Valencia, Edificio de Institutos de Paterna, Apdo 22085, 46071 Valencia, Spain
| | - Aurora Rodríguez-Rodríguez
- Centro de Investigacións Cientı́ficas Avanzadas (CICA) and Departamento de Quı́mica, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Centro de Investigacións Cientı́ficas Avanzadas (CICA) and Departamento de Quı́mica, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Carlos Platas-Iglesias
- Centro de Investigacións Cientı́ficas Avanzadas (CICA) and Departamento de Quı́mica, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - M Teresa Albelda
- Departamento de Quı́mica Inorgánica, Universidad de Valencia, C/Dr. Moliner 50, 46100 Burjasot, Valencia, Spain
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7
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Janicki R, Mondry A. Structural and thermodynamic aspects of hydration of Gd(iii) systems. Dalton Trans 2019; 48:3380-3391. [DOI: 10.1039/c8dt04869j] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A first systematic experimental study on the thermodynamic description of the hydration equilibrium of Gd(iii) compounds is presented.
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Affiliation(s)
- Rafał Janicki
- University of Wrocław
- Faculty of Chemistry
- 50-383 Wrocław
- Poland
| | - Anna Mondry
- University of Wrocław
- Faculty of Chemistry
- 50-383 Wrocław
- Poland
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8
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Aime S, Botta M, Esteban-Gómez D, Platas-Iglesias C. Characterisation of magnetic resonance imaging (MRI) contrast agents using NMR relaxometry. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1516898] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Silvio Aime
- Department of Molecular Biotechnologies and Health Sciences, Molecular Imaging Center, University of Torino, Torino, Italy
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale ‘A. Avogadro’, Alessandria, Italy
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, A Coruña, Spain
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, A Coruña, Spain
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9
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A Coordination Chemistry Approach to Fine-Tune the Physicochemical Parameters of Lanthanide Complexes Relevant to Medical Applications. Chemistry 2018; 24:3127-3131. [DOI: 10.1002/chem.201705528] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Indexed: 12/23/2022]
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10
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Application of Heteronuclear NMR Spectroscopy to Bioinorganic and Medicinal Chemistry ☆. REFERENCE MODULE IN CHEMISTRY, MOLECULAR SCIENCES AND CHEMICAL ENGINEERING 2018. [PMCID: PMC7157447 DOI: 10.1016/b978-0-12-409547-2.10947-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Zhang W, Martinelli J, Peters JA, van Hengst JM, Bouwmeester H, Kramer E, Bonnet CS, Szeremeta F, Tóth É, Djanashvili K. Surface PEG Grafting Density Determines Magnetic Relaxation Properties of Gd-Loaded Porous Nanoparticles for MR Imaging Applications. ACS APPLIED MATERIALS & INTERFACES 2017; 9:23458-23465. [PMID: 28657291 PMCID: PMC5520100 DOI: 10.1021/acsami.7b05912] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 06/28/2017] [Indexed: 06/01/2023]
Abstract
Surface PEGylation of nanoparticles designed for biomedical applications is a common and straightforward way to stabilize the materials for in vivo administration and to increase their circulation time. This strategy becomes less trivial when MRI active porous nanomaterials are concerned as their function relies on water/proton-exchange between the pores and bulk water. Here we present a comprehensive study on the effects of PEGylation on the relaxometric properties of nanozeolite LTL (dimensions of 20 × 40 nm) ion-exchanged with paramagnetic GdIII ions. We evidence that as long as the surface grafting density of the PEG chains does not exceed the "mushroom" regime (conjugation of up to 6.2 wt % of PEG), Gd-LTL retains a remarkable longitudinal relaxivity (38 s-1 mM-1 at 7 T and 25 °C) as well as the pH-dependence of the longitudinal and transverse relaxation times. At higher PEG content, the more compact PEG layer (brush regime) limits proton/water diffusion and exchange between the interior of LTL and the bulk, with detrimental consequences on relaxivity. Furthermore, PEGylation of Gd-LTL dramatically decreases the leakage of toxic GdIII ions in biological media and in the presence of competing anions, which together with minimal cytotoxicity renders these materials promising probes for MRI applications.
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Affiliation(s)
- Wuyuan Zhang
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Jonathan Martinelli
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Joop A. Peters
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Jacob M.A. van Hengst
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Hans Bouwmeester
- RIKILT Wageningen Research, Akkermaalsbos 2, 6708WB Wageningen, The Netherlands
- Division
of Toxicology, Wageningen University, Stippeneng 4, 6708WE Wageningen, The Netherlands
| | - Evelien Kramer
- RIKILT Wageningen Research, Akkermaalsbos 2, 6708WB Wageningen, The Netherlands
| | - Célia S. Bonnet
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Frédéric Szeremeta
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Kristina Djanashvili
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ Delft, The Netherlands
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans Cedex 2, France
- Le Studium, Loire Valley Institute
for Advanced Studies, 1 Rue Dupanloup, 45000 Orléans, France
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12
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Rodríguez-Rodríguez A, Regueiro-Figueroa M, Esteban-Gómez D, Rodríguez-Blas T, Patinec V, Tripier R, Tircsó G, Carniato F, Botta M, Platas-Iglesias C. Definition of the Labile Capping Bond Effect in Lanthanide Complexes. Chemistry 2016; 23:1110-1117. [DOI: 10.1002/chem.201604390] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Indexed: 12/19/2022]
Affiliation(s)
- Aurora Rodríguez-Rodríguez
- Centro de Investigaciones Científicas Avanzadas (CICA); Departamento de Química Fundamental; Facultade de Ciencias; Universidade da Coruña; 15071 A Coruña Galicia Spain
- Université de Bretagne Occidentale, UMR-CNRS 6521; UFR des Sciences et Techniques; 6 avenue Victor le Gorgeu, C.S. 93837 29238 Brest Cedex 3 France
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA); Departamento de Química Fundamental; Facultade de Ciencias; Universidade da Coruña; 15071 A Coruña Galicia Spain
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA); Departamento de Química Fundamental; Facultade de Ciencias; Universidade da Coruña; 15071 A Coruña Galicia Spain
| | - Teresa Rodríguez-Blas
- Centro de Investigaciones Científicas Avanzadas (CICA); Departamento de Química Fundamental; Facultade de Ciencias; Universidade da Coruña; 15071 A Coruña Galicia Spain
| | - Véronique Patinec
- Université de Bretagne Occidentale, UMR-CNRS 6521; UFR des Sciences et Techniques; 6 avenue Victor le Gorgeu, C.S. 93837 29238 Brest Cedex 3 France
| | - Raphaël Tripier
- Université de Bretagne Occidentale, UMR-CNRS 6521; UFR des Sciences et Techniques; 6 avenue Victor le Gorgeu, C.S. 93837 29238 Brest Cedex 3 France
| | - Gyula Tircsó
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen, Egyetem tér 1 Hungary
| | - Fabio Carniato
- Dipartimento di Scienze e Innovazione Tecnologica; Università del Piemonte Orientale “A. Avogadro”; Viale T. Michel 11 15121 Alessandria Italy
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica; Università del Piemonte Orientale “A. Avogadro”; Viale T. Michel 11 15121 Alessandria Italy
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA); Departamento de Química Fundamental; Facultade de Ciencias; Universidade da Coruña; 15071 A Coruña Galicia Spain
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