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Caneda-Martínez L, Valencia L, Fernández-Pérez I, Regueiro-Figueroa M, Angelovski G, Brandariz I, Esteban-Gómez D, Platas-Iglesias C. Toward inert paramagnetic Ni(ii)-based chemical exchange saturation transfer MRI agents. Dalton Trans 2018; 46:15095-15106. [PMID: 29067395 DOI: 10.1039/c7dt02758c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The Ni2+ complexes with hexadentate ligands containing two 6-methylpicolinamide groups linked by ethane-1,2-diamine (dedpam) or cyclohexane-1,2-diamine (chxdedpam) spacers were investigated as potential contrast agents in magnetic resonance imaging (MRI). The properties of the complexes were compared to that of the analogues containing 6-methylpicolinate units (dedpa2- and chxdedpa2-). The X-ray structure of the [Ni(dedpam)]2+ complex reveals a six-coordinated metal ion with a distorted octahedral environment. The protonation constants of the dedpa2- and dedpam ligands and the stability constants of their Ni2+ complexes were determined using pH-potentiometry and spectrophotometric titrations (25 °C, 0.15 M NaCl). The [Ni(dedpa)] complex (log KNiL = 20.88(1)) was found to be considerably more stable than the corresponding amide derivative [Ni(dedpam)]2+ (log KNiL = 14.29(2)). However, the amide derivative [Ni(chxdedpam)]2+ was found to be considerably more inert with respect to proton-assisted dissociation than the carboxylate derivative [Ni(chxdedpa)]. A detailed 1H NMR and DFT study was conducted to assign the 1H NMR spectra of the [Ni(chxdedpa)] and [Ni(chxdedpam)]2+ complexes. The observed 1H NMR paramagnetic shifts were found to be dominated by the Fermi contact contribution. The amide resonances of [Ni(chxdedpam)]2+ at 91.5 and 22.2 ppm were found to provide a sizeable chemical exchange saturation transfer effect, paving the way for the development of NiCEST agents based on these rigid non-macrocyclic platforms.
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Affiliation(s)
- Laura Caneda-Martínez
- 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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Gündüz S, Vibhute S, Botár R, Kálmán FK, Tóth I, Tircsó G, Regueiro-Figueroa M, Esteban-Gómez D, Platas-Iglesias C, Angelovski G. Coordination Properties of GdDO3A-Based Model Compounds of Bioresponsive MRI Contrast Agents. Inorg Chem 2018; 57:5973-5986. [PMID: 29718660 DOI: 10.1021/acs.inorgchem.8b00473] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We report a detailed characterization of the thermodynamic stability and dissociation kinetics of Gd3+ complexes with DO3A derivatives containing a (methylethylcarbamoylmethylamino)acetic acid (L1), (methylpropylcarbamoylmethylamino)acetic acid (L2), 2-dimethylamino- N-ethylacetamide (L3), or 2-dimethylamino- N-propylacetamide (L4) group attached to the fourth nitrogen atom of the macrocyclic unit. These ligands are model systems of Ca2+- and Zn2+-responsive contrast agents (CA) for application in magnetic resonance imaging (MRI). The results of the potentiometric studies ( I = 0.15 M NaCl) provide stability constants with log KGdL values in the range 13.9-14.8. The complex speciation in solution was found to be quite complicated due to the formation of protonated species at low pH, hydroxido complexes at high pH, and stable dinuclear complexes in the case of L1,2. At neutral pH significant fractions of the complexes are protonated at the amine group of the amide side chain (log KGdL×H = 7.2-8.1). These ligands form rather weak complexes with Mg2+ and Ca2+ but very stable complexes with Cu2+ (log KCuL = 20.4-22.3) and Zn2+ (log KZnL = 15.5-17.6). Structural studies using a combination of 1H NMR and luminescence spectroscopy show that the amide group of the ligand is coordinated to the metal ion at pH ∼8.5, while protonation of the amine group provokes the decoordination of the amide O atom and a concomitant increase in the hydration number and proton relaxivity. The dissociation of the complexes occurs mainly through a rather efficient proton-assisted pathway, which results in kinetic inertness comparable to that of nonmacrocyclic ligands such as DTPA rather than DOTA-like complexes.
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Affiliation(s)
- Serhat Gündüz
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
| | - Sandip Vibhute
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
| | - Richard Botár
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Ferenc K Kálmán
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Imre Tóth
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Gyula Tircsó
- Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology , University of Debrecen , Egyetem tér 1 , H-4032 Debrecen , Hungary
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química , Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10 , 15008 A Coruña , Spain
| | - Goran Angelovski
- MR Neuroimaging Agents , Max Planck Institute for Biological Cybernetics , D-72076 Tuebingen , Germany
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Forgács A, Pujales-Paradela R, Regueiro-Figueroa M, Valencia L, Esteban-Gómez D, Botta M, Platas-Iglesias C. Developing the family of picolinate ligands for Mn 2+ complexation. Dalton Trans 2018; 46:1546-1558. [PMID: 28091671 DOI: 10.1039/c6dt04442e] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have reported here a series of ligands containing pentadentate 6,6'-(azanediylbis(methylene))dipicolinic acid units that differ in the substituent present at the amine nitrogen atom (acetate: H3DPAAA; phenyl: H2DPAPhA; dodecyl: H2DPAC12A; 4-hexylphenyl: H2DPAC6PhA). The protonation constants of the hexadentate DPAAA3- and pentadentate DPAPhA2- ligands and the stability constants of their Mn2+ complexes were determined using pH-potentiometry (25 °C, 0.15 M NaCl). The mono-hydrated [Mn(DPAAA)]- complex (log KMnL = 13.19(5)) was found to be considerably more stable than the bis-hydrated [Mn(DPAPhA)] analogue (log KMnL = 9.55(1)). A detailed 1H and 17O NMR relaxometric study was carried out to determine the parameters that govern the proton relaxivities of these complexes. The [Mn(DPAC12A)] complex, which contains a dodecyl lipophilic chain, forms micelles in solution characterized by a critical micellar concentration (cmc) of 96(9) μM. The lipophilic [Mn(DPAC6PhA)] and [Mn(DPAC12A)] derivatives form rather strong adducts with Human Serum Albumin (HSA) with association constants of 7.1 ± 0.1 × 103 and 1.3 ± 0.4 × 105 M-1, respectively. The X-ray structure of the complex {K(H2O)4}{[Mn(DPAAA)(H2O)]}2 shows that the Mn2+ ion in [Mn(DPAAA)]- is coordinated to the six donor atoms of the ligand, a coordinated water molecule completing the pentagonal bipyramidal coordination environment.
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Affiliation(s)
- Attila Forgács
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Rosa Pujales-Paradela
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Martín Regueiro-Figueroa
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Facultade de Ciencias, 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.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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Helm L, Morrow JR, Bond CJ, Carniato F, Botta M, Braun M, Baranyai Z, Pujales-Paradela R, Regueiro-Figueroa M, Esteban-Gómez D, Platas-Iglesias C, Scholl TJ. Chapter 2. Gadolinium-based Contrast Agents. New Developments in NMR 2017. [DOI: 10.1039/9781788010146-00121] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Xing Y, Jindal AK, Regueiro-Figueroa M, Le Fur M, Kervarec N, Zhao P, Kovacs Z, Valencia L, Pérez-Lourido P, Tripier R, Esteban-Gómez D, Platas-Iglesias C, Sherry AD. The Relationship between NMR Chemical Shifts of Thermally Polarized and Hyperpolarized 89 Y Complexes and Their Solution Structures. Chemistry 2016; 22:16657-16667. [PMID: 27723138 DOI: 10.1002/chem.201602901] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 01/13/2023]
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 89 Y is an ideal candidate because of its narrow NMR linewidth, favorable spin quantum number (I=1/2 ), and long longitudinal relaxation times (T1 ). Strong NMR signals were detected in hyperpolarized 89 Y samples of a variety of yttrium complexes. A dataset of 89 Y NMR data composed of 23 complexes with polyaminocarboxylate ligands was obtained using hyperpolarized 89 Y measurements or 1 H,89 Y-HMQC spectroscopy. These data were used to derive an empirical equation that describes the correlation between the 89 Y chemical shift and the chemical structure of the complexes. This empirical correlation serves as a guide for the design of 89 Y sensors. Relativistic (DKH2) DFT calculations were found to predict the experimental 89 Y chemical shifts to a rather good accuracy.
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Affiliation(s)
- Yixun Xing
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA
| | - Ashish K Jindal
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Mariane Le Fur
- 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
| | - Nelly Kervarec
- Plateforme de RMN-RPE, 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
| | - Piyu Zhao
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA
| | - Zoltan Kovacs
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310, Pontevedra, Spain
| | - Paulo Pérez-Lourido
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310, Pontevedra, Spain
| | - 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
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) y Departamento de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain.
| | - A Dean Sherry
- Department of Chemistry, University of Texas, Dallas, 800 West Campbell Road, Richardson, Texas, 75080, USA. .,Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5325 Harry Hines Boulevard, Dallas, Texas, 75390, USA.
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Kumas C, Fernando WS, Zhao P, Regueiro-Figueroa M, Kiefer GE, Martins AF, Platas-Iglesias C, Sherry AD. Unexpected Changes in the Population of Coordination Isomers for the Lanthanide Ion Complexes of DOTMA-Tetraglycinate. Inorg Chem 2016; 55:9297-305. [PMID: 27603690 DOI: 10.1021/acs.inorgchem.6b01390] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lanthanide complexes with DOTA-tetraglycinate (DOTA-(gly)4) heavily favor the square antiprismatic (SAP) coordination isomer in aqueous solution, a structural feature that has made them useful as water-based paraCEST agents. In an effort to create amide-based paraCEST agents with rapid water exchange rates, we prepared the analogous tetraglycinate complexes with DOTMA, a ligand known to favor the twisted square antiprismatic (TSAP) coordination structures. Unexpectedly, NMR investigations show that the LnDOTMA-(gly)4 complexes, like the LnDOTA-(gly)4 complexes, also favor the SAP isomers in solution. This observation led to density functional theory (DFT) calculations in order to identify the energy terms that favor the SAP structures in lanthanide complexes formed with macrocyclic DOTA- and DOTMA-tetraamide ligands. The DFT calculations revealed that, regardless the nature of the ligand, the TSAP isomers present more negative hydration energies than the SAP counterparts. The extent to which the TSAP isomer is stabilized varies, however, depending on the ligand structure, resulting in different isomeric populations in solution.
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Affiliation(s)
- Cemile Kumas
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States
| | - W Shirangi Fernando
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States
| | - Piyu Zhao
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Garry E Kiefer
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States.,Macrocyclics, Inc. , Dallas, Texas 75235, United States
| | - André F Martins
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States
| | - Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - A Dean Sherry
- Department of Chemistry, University of Texas at Dallas , Dallas, Texas 75080, United States.,Advanced Imaging Research Center, University of Texas Southwestern Medical Center , Dallas, Texas 75390, United States
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Platas-Iglesias C, Esteban-Gómez D, Helm L, Regueiro-Figueroa M. Transient versus Static Electron Spin Relaxation in Mn(2+) Complexes Relevant as MRI Contrast Agents. J Phys Chem A 2016; 120:6467-76. [PMID: 27459626 DOI: 10.1021/acs.jpca.6b05423] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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-diylbis(azanetriyl))tetraacetate; MeNO2A = 2,2'-(7-methyl-1,4,7-triazonane-1,4-diyl)diacetate). Subsequent molecular dynamics calculations performed within the atom-centered density matrix propagation (ADMP) approach provided access to the transient and static ZFS parameters, as well as to the correlation time of the transient ZFS. The calculated ZFS parameters present a reasonable agreement with the experimental values obtained from the analysis of (1)H relaxation data. The correlation times calculated for the two systems investigated turned out to be very short (τc ∼ 0.02-0.05 ps), which shows that the transient ZFS is modulated by molecular vibrations. On the contrary, the static ZFS is modulated by the rotation of the complexes in solution, which for the small complexes investigated here is characterized by rotational correlation times of τR ∼ 35-60 ps. As a result, electron spin relaxation in small Mn(2+) complexes is dominated by the static ZFS.
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Affiliation(s)
- Carlos Platas-Iglesias
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Lothar Helm
- Laboratoire de Chimie Inorganique et Bioinorganique, Ecole Polytechnique Fédérale de Lausanne, EPFL-BCH , CH-1015 Lausanne, Switzerland
| | - Martín Regueiro-Figueroa
- Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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Castro G, Regueiro-Figueroa M, Esteban-Gómez D, Pérez-Lourido P, Platas-Iglesias C, Valencia L. Magnetic Anisotropies in Rhombic Lanthanide(III) Complexes Do Not Conform to Bleaney’s Theory. Inorg Chem 2016; 55:3490-7. [DOI: 10.1021/acs.inorgchem.5b02918] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Goretti Castro
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
| | - Martín Regueiro-Figueroa
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Paulo Pérez-Lourido
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
| | - Carlos Platas-Iglesias
- Centro
de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica,
Facultad de Ciencias, Universidade de Vigo, As Lagoas, Pontevedra, Marcosende 36310, Spain
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Rodríguez-Rodríguez A, Regueiro-Figueroa M, Esteban-Gómez D, Tripier R, Tircsó G, Kálmán FK, Bényei AC, Tóth I, Blas AD, Rodríguez-Blas T, Platas-Iglesias C. Complexation of Ln3+ Ions with Cyclam Dipicolinates: A Small Bridge that Makes Huge Differences in Structure, Equilibrium, and Kinetic Properties. Inorg Chem 2016; 55:2227-39. [DOI: 10.1021/acs.inorgchem.5b02627] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Aurora Rodríguez-Rodríguez
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, 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
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - David Esteban-Gómez
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - 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
- 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
| | | | | | | | - Andrés de Blas
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Teresa Rodríguez-Blas
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Carlos Platas-Iglesias
- Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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11
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Tircsó G, Regueiro-Figueroa M, Nagy V, Garda Z, Garai T, Kálmán FK, Esteban-Gómez D, Tóth É, Platas-Iglesias C. Approaching the Kinetic Inertness of Macrocyclic Gadolinium(III)-Based MRI Contrast Agents with Highly Rigid Open-Chain Derivatives. Chemistry 2016; 22:896-901. [DOI: 10.1002/chem.201503836] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Gyula Tircsó
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen Egyetem tér 1 Hungary
- 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
| | - Martín Regueiro-Figueroa
- Departamento de Química Fundamental; Universidade da Coruña; Campus da Zapateira, Rúa da Fraga 10 15008A Coruña Spain
| | - Viktória Nagy
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen Egyetem tér 1 Hungary
| | - Zoltán Garda
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen Egyetem tér 1 Hungary
| | - Tamás Garai
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen Egyetem tér 1 Hungary
| | - Ferenc Krisztián Kálmán
- Department of Inorganic and Analytical Chemistry; University of Debrecen; 4010 Debrecen Egyetem tér 1 Hungary
| | - David Esteban-Gómez
- Departamento de Química Fundamental; Universidade da Coruña; Campus da Zapateira, Rúa da Fraga 10 15008A Coruña Spain
| | - Éva Tóth
- Centre de Biophysique Moléculaire; CNRS; rue Charles Sadron 45071 Orléans, Cedex 2 France)
| | - Carlos Platas-Iglesias
- Departamento de Química Fundamental; Universidade da Coruña; Campus da Zapateira, Rúa da Fraga 10 15008A Coruña Spain
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12
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Castro G, Regueiro-Figueroa M, Esteban-Gómez D, Bastida R, Macías A, Pérez-Lourido P, Platas-Iglesias C, Valencia L. Exceptionally Inert Lanthanide(III) PARACEST MRI Contrast Agents Based on an 18-Membered Macrocyclic Platform. Chemistry 2015; 21:18662-70. [DOI: 10.1002/chem.201502937] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Indexed: 11/10/2022]
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13
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Regueiro-Figueroa M, Gündüz S, Patinec V, Logothetis NK, Esteban-Gómez D, Tripier R, Angelovski G, Platas-Iglesias C. Gd(3+)-Based Magnetic Resonance Imaging Contrast Agent Responsive to Zn(2+). Inorg Chem 2015; 54:10342-50. [PMID: 26468992 DOI: 10.1021/acs.inorgchem.5b01719] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report the heteroditopic ligand H5L, which contains a DO3A unit for Gd(3+) complexation connected to an NO2A moiety through a N-propylacetamide linker. The synthesis of the ligand followed a convergent route that involved the preparation of 1,4-bis(tert-butoxycarbonylmethyl)-1,4,7-triazacyclononane following the orthoamide strategy. The luminescence lifetimes of the Tb((5)D4) excited state measured for the TbL complex point to the absence of coordinated water molecules. Density functional theory calculations and (1)H NMR studies indicate that the EuL complex presents a square antiprismatic coordination in aqueous solution, where eight coordination is provided by the seven donor atoms of the DO3A unit and the amide oxygen atom of the N-propylacetamide linker. Addition of Zn(2+) to aqueous solutions of the TbL complex provokes a decrease of the emission intensity as the emission lifetime becomes shorter, which is a consequence of the coordination of a water molecule to the Tb(3+) ion upon Zn(2+) binding to the NO2A moiety. The relaxivity of the GdL complex recorded at 7 T (25 °C) increases by almost 150% in the presence of 1 equiv of Zn(2+), while Ca(2+) and Mg(2+) induced very small relaxivity changes. In vitro magnetic resonance imaging experiments confirmed the ability of GdL to provide response to the presence of Zn(2+).
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Affiliation(s)
- Martín Regueiro-Figueroa
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Serhat Gündüz
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics , Spemannstr. 41, 72076 Tübingen, Germany
| | - Véronique Patinec
- UFR des Sciences et Techniques, Université de Bretagne Occidentale, UMR-CNRS 6521 , 6 avenue Victor le Gorgeu, C.S. 93837, 29238 BREST Cedex 3, France
| | - Nikos K Logothetis
- Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics , Tübingen, Germany.,Department of Imaging Science and Biomedical Engineering, University of Manchester , Manchester, U.K
| | - David Esteban-Gómez
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Raphaël Tripier
- UFR des Sciences et Techniques, Université de Bretagne Occidentale, UMR-CNRS 6521 , 6 avenue Victor le Gorgeu, C.S. 93837, 29238 BREST Cedex 3, France
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics , Spemannstr. 41, 72076 Tübingen, Germany
| | - Carlos Platas-Iglesias
- Grupo QUICOOR, Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coruña , Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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14
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Forgács A, Regueiro-Figueroa M, Barriada JL, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Botta M, Platas-Iglesias C. Mono-, bi-, and trinuclear bis-hydrated Mn(2+) complexes as potential MRI contrast agents. Inorg Chem 2015; 54:9576-87. [PMID: 26397808 DOI: 10.1021/acs.inorgchem.5b01677] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We report a series of ligands containing pentadentate 6,6′-((methylazanediyl)bis(methylene))dipicolinic acid binding units that form mono- (H2dpama), di- (mX(H2dpama)2), and trinuclear (mX(H2dpama)3) complexes with Mn2+ containing two coordinated water molecules per metal ion, which results in pentagonal bipyramidal coordination around the metal ions. In contrast, the hexadentate ligand 6,6′-((ethane-1,2-diylbis(azanediyl))bis(methylene))dipicolinic acid (H2bcpe) forms a complex with distorted octahedral coordination around Mn2+ that lacks coordinated water molecules. The protonation constants of the ligands and the stability constants of the Mn2+, Cu2+, and Zn2+ complexes were determined using potentiometric and spectrophotometric titrations in 0.15 M NaCl. The pentadentate dpama2– ligand and the di- and trinucleating mX(dpama)24– and mX(dpama)36– ligands provide metal complexes with stabilities that are very similar to that of the complex with the hexadentate ligand bcpe2–, with log β101 values in the range 10.1–11.6. Cyclic voltammetry experiments on aqueous solutions of the [Mn(bcpe)] complex reveal a quasireversible system with a half-wave potential of +595 mV versus Ag/AgCl. However, [Mn(dpama)] did not suffer oxidation in the range 0.0–1.0 V, revealing a higher resistance toward oxidation. A detailed 1H NMRD and 17O NMR study provided insight into the parameters that govern the relaxivity for these systems. The exchange rate of the coordinated water molecules in [Mn(dpama)] is relatively fast, kex298 = (3.06 ± 0.16) × 108 s–1. The trinuclear [mX(Mn(dpama)(H2O)2)3] complex was found to bind human serum albumin with an association constant of 1286 ± 55 M–1 and a relaxivity of the adduct of 45.2 ± 0.6 mM–1 s–1 at 310 K and 20 MHz.
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Affiliation(s)
- Attila Forgács
- 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
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15
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Regueiro-Figueroa M, Platas-Iglesias C. Toward the Prediction of Water Exchange Rates in Magnetic Resonance Imaging Contrast Agents: A Density Functional Theory Study. J Phys Chem A 2015; 119:6436-45. [DOI: 10.1021/acs.jpca.5b01728] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento
de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Carlos Platas-Iglesias
- Departamento
de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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16
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Regueiro-Figueroa M, Barriada JL, Pallier A, Esteban-Gómez D, Blas AD, Rodríguez-Blas T, Tóth É, Platas-Iglesias C. Stabilizing Divalent Europium in Aqueous Solution Using Size-Discrimination and Electrostatic Effects. Inorg Chem 2015; 54:4940-52. [DOI: 10.1021/acs.inorgchem.5b00548] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - José Luis Barriada
- Departamento de Química Física e Enxeñaría
Química I, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Agnès Pallier
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans, Cedex 2, France
| | - David Esteban-Gómez
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Andrés de Blas
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Teresa Rodríguez-Blas
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Éva Tóth
- Centre de Biophysique Moléculaire, CNRS, Rue Charles Sadron, 45071 Orléans, Cedex 2, France
| | - Carlos Platas-Iglesias
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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17
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Kálmán FK, Végh A, Regueiro-Figueroa M, Tóth É, Platas-Iglesias C, Tircsó G. H4octapa: highly stable complexation of lanthanide(III) ions and copper(II). Inorg Chem 2015; 54:2345-56. [PMID: 25692564 DOI: 10.1021/ic502966m] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The acyclic ligand octapa(4-) (H4octapa = 6,6'-((ethane-1,2-diylbis((carboxymethyl)azanediyl))bis(methylene))dipicolinic acid) forms stable complexes with the Ln(3+) ions in aqueous solution. The stability constants determined for the complexes with La(3+), Gd(3+), and Lu(3+) using relaxometric methods are log KLaL = 20.13(7), log KGdL = 20.23(4), and log KLuL = 20.49(5) (I = 0.15 M NaCl). High stability constants were also determined for the complexes formed with divalent metal ions such as Zn(2+) and Cu(2+) (log KZnL = 18.91(3) and log KCuL = 22.08(2)). UV-visible and NMR spectroscopic studies and density functional theory (DFT) calculations point to hexadentate binding of the ligand to Zn(2+) and Cu(2+), the donor atoms of the acetate groups of the ligand remaining uncoordinated. The complexes formed with the Ln(3+) ions are nine-coordinated thanks to the octadentate binding of the ligand and the presence of a coordinated water molecule. The stability constants of the complexes formed with the Ln(3+) ions do not change significantly across the lanthanide series. A DFT investigation shows that this is the result of a subtle balance between the increased binding energies across the 4f period, which contribute to an increasing complex stability, and the parallel increase of the absolute values of the hydration free energies of the Ln(3+) ions. In the case of the [Ln(octapa)(H2O)](-) complexes the interaction between the amine nitrogen atoms of the ligand and the Ln(3+) ions is weakened along the lanthanide series, and therefore the increased electrostatic interaction does not overcome the increasing hydration energies. A detailed kinetic study of the dissociation of the [Gd(octapa)(H2O)](-) complex in the presence of Cu(2+) shows that the metal-assisted pathway is the main responsible for complex dissociation at pH 7.4 and physiological [Cu(2+)] concentration (1 μM).
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Affiliation(s)
- Ferenc Krisztián Kálmán
- Department of Inorganic and Analytical Chemistry, University of Debrecen , Egyetem tér 1, H-4010 Debrecen, Hungary
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18
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Regueiro-Figueroa M, Lima LMP, Blanco V, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Delgado R, Platas-Iglesias C. Reasons behind the Relative Abundances of Heptacoordinate Complexes along the Late First-Row Transition Metal Series. Inorg Chem 2014; 53:12859-69. [DOI: 10.1021/ic501869y] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento
de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Luís M. P. Lima
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Víctor Blanco
- Departamento
de Química Orgánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva S/N, 18071 Granada, Spain
| | - David Esteban-Gómez
- Departamento
de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Andrés de Blas
- Departamento
de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Teresa Rodríguez-Blas
- Departamento
de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Rita Delgado
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Carlos Platas-Iglesias
- Departamento
de Química Fundamental, Facultade de Ciencias, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
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19
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Regueiro-Figueroa M, Ruscsák E, Fra L, Tircsó G, Tóth I, de Blas A, Rodríguez-Blas T, Platas-Iglesias C, Esteban-Gómez D. Highly Stable Complexes of Divalent Metal Ions (Mg2+, Ca2+, Cu2+, Zn2+, Cd2+, and Pb2+) with a Dota-Like Ligand Containing a Picolinate Pendant. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402693] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Regueiro-Figueroa M, Rolla GA, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Botta M, Platas-Iglesias C. High Relaxivity Mn2+-Based MRI Contrast Agents. Chemistry 2014; 20:17300-5. [DOI: 10.1002/chem.201404673] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 02/05/2023]
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21
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Liu T, Nonat A, Beyler M, Regueiro-Figueroa M, Nchimi Nono K, Jeannin O, Camerel F, Debaene F, Cianférani-Sanglier S, Tripier R, Platas-Iglesias C, Charbonnière LJ. Supramolecular luminescent lanthanide dimers for fluoride sequestering and sensing. Angew Chem Int Ed Engl 2014; 53:7259-63. [PMID: 24909695 DOI: 10.1002/anie.201404847] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Indexed: 01/05/2023]
Abstract
Lanthanide complexes (Ln=Eu, Tb, and Yb) that are based on a C2 -symmetric cyclen scaffold were prepared and characterized. The addition of fluoride anions to aqueous solutions of the complexes resulted in the formation of dinuclear supramolecular compounds in which the anion is confined into the cavity that is formed by the two complexes. The supramolecular assembly process was monitored by UV/Vis absorption, luminescence, and NMR spectroscopy and high-resolution mass spectrometry. The X-ray crystal structure of the europium dimer revealed that the architecture of the scaffold is stabilized by synergistic effects of the EuFEu bridging motive, π stacking interactions, and a four-component hydrogen-bonding network, which control the assembly of the two [EuL] entities around the fluoride ion. The strong association in water allowed for the luminescence sensing of fluoride down to a detection limit of 24 nM.
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Affiliation(s)
- Tao Liu
- LIMAA, IPHC, UMR 7178 CNRS, Université de Strasbourg, ECPM, 25 rue Becquerel, 67087 Strasbourg Cedex (France)
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22
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Roger M, Regueiro-Figueroa M, Ben Azzeddine C, Patinec V, Bonnet CS, Platas-Iglesias C, Tripier R. Lanthanide Complexes with Heteroditopic Ligands as Fluorescent Zinc Sensors. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301426] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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23
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Regueiro-Figueroa M, Nonat A, Rolla GA, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Charbonnière LJ, Botta M, Platas-Iglesias C. Self-Aggregated Dinuclear Lanthanide(III) Complexes as Potential Bimodal Probes for Magnetic Resonance and Optical Imaging. Chemistry 2013; 19:11696-706. [DOI: 10.1002/chem.201301231] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Indexed: 11/10/2022]
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24
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Charbonnière LJ, Faulkner S, Platas-Iglesias C, Regueiro-Figueroa M, Nonat A, Rodríguez-Blas T, de Blas A, Perry WS, Tropiano M. Ln2M complexes (M = Ru, Re) derived from a bismacrocyclic ligand containing a 4,4′-dimethyl-2,2′-bipyridyl bridging unit. Dalton Trans 2013; 42:3667-81. [DOI: 10.1039/c2dt32660d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Nonat A, Regueiro-Figueroa M, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Platas-Iglesias C, Charbonnière LJ. Definition of an Intramolecular Eu-to-Eu Energy Transfer within a Discrete [Eu2L] Complex in Solution. Chemistry 2012; 18:8163-73. [DOI: 10.1002/chem.201200087] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Indexed: 01/01/2023]
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26
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López-Vidal EM, Regueiro-Figueroa M, García MD, Platas-Iglesias C, Peinador C, Quintela JM. Probing Electrostatic Potential by NMR with the Use of a Paramagnetic Lanthanide(III) Chelate. Inorg Chem 2012; 51:4429-31. [DOI: 10.1021/ic300288j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eva M. López-Vidal
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Marcos D. García
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Carlos Platas-Iglesias
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - Carlos Peinador
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
| | - José M. Quintela
- Departamento de Química Fundamental, Universidade da Coruña, Campus
da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain
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Carreira-Barral I, Rodríguez-Rodríguez A, Regueiro-Figueroa M, Esteban-Gómez D, Platas-Iglesias C, Blas AD, Rodríguez-Blas T. A merged experimental and theoretical conformational study on alkaline-earth complexes with lariat ethers derived from 4,13-diaza-18-crown-6. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.01.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Regueiro-Figueroa M, Bensenane B, Ruscsák E, Esteban-Gómez D, Charbonnière LJ, Tircsó G, Tóth I, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Lanthanide dota-like complexes containing a picolinate pendant: structural entry for the design of Ln(III)-based luminescent probes. Inorg Chem 2011; 50:4125-41. [PMID: 21456610 DOI: 10.1021/ic2001915] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this contribution we present two ligands based on a do3a platform containing a picolinate group attached to the fourth nitrogen atom of the cyclen unit, which are designed for stable lanthanide complexation in aqueous solutions. Potentiometric measurements reveal that the thermodynamic stability of the complexes is very high (log K = 21.2-23.5), being comparable to that of the dota analogues. Luminescence lifetime measurements performed on solutions of the Eu(III) and Tb(III) complexes indicate that the complexes are nine coordinate with no inner-sphere water molecules. A combination of density functional theory (DFT) calculations and NMR measurements shows that for the complexes of the heaviest lanthanides there is a major isomer in solution consisting of the enantiomeric pair Λ(δδδδ) and Δ(λλλλ), which provides square antiprismatic coordination (SAP) around the metal ion. Analysis of the Yb(III)-induced paramagnetic shifts unambiguously confirms that these complexes have SAP coordination in aqueous solution. For the light lanthanide ions however both the SAP and twisted-square antiprismatic (TSAP) isomers are present in solution. Inversion of the cyclen ring appears to be the rate-determining step for the Λ(δδδδ) ↔ Δ(λλλλ) enantiomerization process observed in the Lu(III) complexes. The energy barriers obtained from NMR measurements for this dynamic process are in excellent agreement with those predicted by DFT calculations. The energy barriers calculated for the arm-rotation process are considerably lower than those obtained for the ring-inversion path. Kinetic studies show that replacement of an acetate arm of dota by a picolinate pendant results in a 3-fold increase in the formation rate of the corresponding Eu(III) complexes and a significant increase of the rates of acid-catalyzed dissociation of the complexes. However, these rates are 1-2 orders of magnitude lower than those of do3a analogues, which shows that the complexes reported herein are remarkably inert with respect to metal ion dissociation.
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Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira-Rúa da Fraga 10, 15008 A Coruña, Spain
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Katia NN, Lecointre A, Regueiro-Figueroa M, Platas-Iglesias C, Charbonnière LJ. Nonmacrocyclic Luminescent Lanthanide Complexes Stable in Biological Media. Inorg Chem 2011; 50:1689-97. [DOI: 10.1021/ic102173f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Nchimi Nono Katia
- Laboratoire d’Ingénierie Moléculaire Appliquée à l’Analyse, IPHC, UMR 7178 CNRS/UdS, ECPM, Bâtiment R1N0, 25 Rue Becquerel, 67087, Strasbourg Cedex 02, France
| | - Alexandre Lecointre
- Laboratoire d’Ingénierie Moléculaire Appliquée à l’Analyse, IPHC, UMR 7178 CNRS/UdS, ECPM, Bâtiment R1N0, 25 Rue Becquerel, 67087, Strasbourg Cedex 02, France
| | - Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus de Zapateira, Rúa da Fraga 10, 15008, A Coruña, Spain
| | - Carlos Platas-Iglesias
- Departamento de Química Fundamental, Universidade da Coruña, Campus de Zapateira, Rúa da Fraga 10, 15008, A Coruña, Spain
| | - Loïc J. Charbonnière
- Laboratoire d’Ingénierie Moléculaire Appliquée à l’Analyse, IPHC, UMR 7178 CNRS/UdS, ECPM, Bâtiment R1N0, 25 Rue Becquerel, 67087, Strasbourg Cedex 02, France
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Regueiro-Figueroa M, Djanashvili K, Esteban-Gómez D, Chauvin T, Tóth E, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Molecular recognition of sialic acid by lanthanide(III) complexes through cooperative two-site binding. Inorg Chem 2010; 49:4212-23. [PMID: 20373796 DOI: 10.1021/ic902461g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Herein we report two new ligands, 1,4,7-tris(carboxymethyl)-10-[2-(dihydroxyboranyl)benzyl]-1,4,7,10-tetraazacyclododecane (L(1)) and 1,4,7-tris(carboxymethyl)-10-[3-(dihydroxyboranyl)benzyl]-1,4,7,10-tetraazacyclododecane (L(2)), which contain a phenylboronic acid (PBA) function and a 1,4,7,10-tetraazacyclododecane-1,4,7-triacetate cage for complexation of lanthanide ions in an aqueous solution. The pK(a) of the PBA function amounts to 4.6 in [Gd(L(1))] and 8.9 in [Gd(L(2))], with the value of the L(2) analogue being very similar to that of PBA (8.8). These results are explained by the coordination of the PBA function of L(1) to the Gd(III) ion, which results in a dramatic lowering of its pK(a). As a consequence, [Gd(L(1))] does not bind to saccharides at physiological pH. The nuclear magnetic relaxation dispersion profiles recorded for [Gd(L(1))] and [Gd(L(2))] confirm that the phenylboronate function is coordinated to the metal ion in the L(1) derivative, which results in a q = 0 complex. The interaction of the [Gd(L(2))] complex with 5-acetylneuraminic acid (Neu5Ac) and 2-alpha-O-methyl-5-acetylneuraminic acid (MeNeu5Ac) has been investigated by means of spectrophotometric titrations in an aqueous solution (pH 7.4, 0.1 M 3-(N-morpholino)propanesulfonic acid buffer). Furthermore, we have also investigated the binding of these receptors with competing monosaccharides such as D-(+)-glucose, D-fructose, D-mannose, D-galactose, methyl alpha-D-galactoside, and methyl alpha-D-mannoside. The binding constants obtained indicate an important selectivity of [Gd(L(2))] for Neu5Ac (K(eq) = 151) over D-(+)-glucose (K(eq) = 12.3), D-mannose (K(eq) = 21.9), and D-galactose (K(eq) = 24.5). Furthermore, a very weak binding affinity was observed in the case of methyl alpha-D-galactoside and methyl alpha-D-mannoside. An 8-fold increase of the binding constant of [Gd(L(2))] with Neu5Ac is observed when compared to that of PBA determined under the same conditions (K(eq) = 19). (13)C NMR spectroscopy and density functional theory calculations performed at the B3LYP/6-31G(d) level show that this is due to a cooperative two-site binding of Neu5Ac through (1) ester formation by interaction on the PBA function of the receptor and (2) coordination of the carboxylate group of Neu5Ac to the Gd(III) ion. The emission lifetime of the (5)D(4) level of Tb(III) in [Tb(L(2))] increases upon Neu5Ac binding, in line with the displacement of inner-sphere water molecules due to coordination of Neu5Ac to the metal ion.
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Affiliation(s)
- Martín Regueiro-Figueroa
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
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Regueiro-Figueroa M, Esteban-Gómez D, de Blas A, Rodríguez-Blas T, Platas-Iglesias C. Structure and Dynamics of Lanthanide(III) Complexes with an N-Alkylated do3a Ligand (H3do3a = 1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic Acid): A Combined Experimental and DFT Study. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Regueiro-Figueroa M, Djanashvili K, Esteban-Gómez D, de Blas A, Platas-Iglesias C, Rodríguez-Blas T. Towards Selective Recognition of Sialic Acid Through Simultaneous Binding to Its cis-Diol and Carboxylate Functions. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000186] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Vaiana L, Regueiro-Figueroa M, Mato-Iglesias M, Platas-Iglesias C, Esteban-Gómez D, de Blas A, Rodríguez-Blas T. Seven-Coordination versus Six-Coordination in Divalent First-Row Transition-Metal Complexes Derived from 1,10-Diaza-15-crown-5. Inorg Chem 2007; 46:8271-82. [PMID: 17764174 DOI: 10.1021/ic7008946] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The complexes of the heptadentate receptor N,N'-bis(benzimidazol-2-ylmethyl)-1,10-diaza-15-crown-5 (L2) with MnII, CoII, NiII, CuII, and ZnII are reported. The X-ray crystal structures of the ZnII and NiII complexes show that whereas the ZnII ion is seven-coordinated in a (distorted) pentagonal-bipyramidal coordination environment, the NiII ion is only six-coordinated in a distorted octahedral coordination environment. Theoretical calculations on the [M(L2)]2+ systems (M = Mn, Co, Ni, Cu, or Zn) performed at the density functional theory (DFT; B3LYP) level have been used to obtain information about the structure and electronic properties of these complexes, as well as to rationalize their preferences for a pentagonal-bipyramidal or an octahedral coordination. We have found that for the MnII, CoII, CuII, and ZnII complexes, geometry optimizations lead systematically to pentagonal-bipyramidal coordination environments around the metal ions. However, for the NiII complex, two minimum-energy conformations were obtained, with the metal ion being in octahedral (o-[Ni(L2)]2+) or pentagonal-bipyramidal (pb-[Ni(L2)]2+) coordination. The stabilization of the octahedral geometry in the NiII complex can be considered as the result of the Jahn-Teller effect operating in pentagonal-bipyramidal geometry, which in an extreme case leads to an octahedral coordination. Spectrophotometric titrations carried out in dimethyl sulfoxide (DMSO) and CH3CN/DMSO (9:1) solutions indicate the following stability sequence for the complexes of L2: CoII approximately NiII > ZnII > MnII. The variations in the geometry and stability of the complexes may be rationalized in terms of the different occupations of the frontier molecular orbitals along the first-row transition-metal series. Finally, a time-dependent DFT approach was used to investigate the absorption spectrum of the [Cu(L2)]2+ complex based on the optimized geometries at the B3LYP level, also confirming a pentagonal-bipyramidal coordination in solution for this compound.
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Affiliation(s)
- Lea Vaiana
- Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Alejandro de la Sota 1, 15008 A Coruña, Spain
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Regueiro-Figueroa M, Esteban-Gómez D, Platas-Iglesias C, de Blas A, Rodríguez-Blas T. Metal Ion Complementarity: Effect of Ring-Size Variation on the Conformation and Stability of Lead(II) and Cadmium(II) Complexes with Pendant-Armed Crowns. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601220] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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