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Guo X, Zhang L, Hu J, Szilágyi B, Yu M, Chen S, Tircsó G, Zhou X, Tao J. Improving the potential of paraCEST through magnetic-coupling induced line sharpening. Chem Sci 2023; 14:14157-14165. [PMID: 38098703 PMCID: PMC10717539 DOI: 10.1039/d3sc04770a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 11/17/2023] [Indexed: 12/17/2023] Open
Abstract
Magnetic coupling between paramagnetic centers is a crucial phenomenon in the design of efficient MRI contrast agents. In this study, we investigate the paraCEST properties and magnetic coupling effects of a novel homodinuclear Ni(ii) complex, 1, containing a Robson type macrocyclic ligand. A thorough analysis of the complex's electronic and magnetic properties revealed that the magnetic coupling effect reduces the transverse relaxation rate and enhances the sharpness of the proton resonances, leading to enhanced CEST efficiency. This novel mechanism, which we coined "magnetic-coupling induced line sharpening" (MILS), can be crucial for optimizing the performance of paramagnetic metal complexes in paraCEST imaging. Moreover, magnetic coupling plays a critical role in the relaxation properties of homodinuclear complexes. Our study not only paves the way for the creation of advanced paraCEST agents with enhanced CEST capabilities and sensitivity but also provides valuable guidance for the design of other MRI contrast agents utilizing dinuclear metal complexes.
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Affiliation(s)
- Xin Guo
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Lei Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Jiesheng Hu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Balázs Szilágyi
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
- Doctoral School of Chemistry, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
| | - Meng Yu
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
| | - Shizhen Chen
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen Egyetem tér 1 H-4032 Debrecen Hungary
| | - Xin Zhou
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics Wuhan 430071 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Jun Tao
- Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology Beijing 102488 China
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2
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Panda SK, Rai A, Singh AK. Study of paraCEST response on six-coordinated Co(II) and Ni(II) complexes of a pyridine-tetraamide-based ligand. Dalton Trans 2023. [PMID: 38009007 DOI: 10.1039/d3dt02283h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
This study highlights the successful synthesis of a potential ligand, 2,2',2'',2'''-((pyridine-2,6-diylbis(methylene))bis(azanetriyl))tetraacetamide (PATA), along with its corresponding Co(II) and Ni(II) complexes for paraCEST-based agents. X-ray diffraction data confirmed that both the complexes are six coordinated with distorted octahedral geometries, but only the [Co(PATA)]2+ complex has a good structural feature to show paraCEST activity. After a thorough characterization of the ligand and both of its complexes, various studies, including solution-state magnetic properties, redox properties, temperature, and pH variation studies, were carried out. [Co(PATA)]2+ remained inert in the presence of competing ions, under acidic conditions, at high temperatures, and in the physiological pH range. The paraCEST response of [Co(PATA)]2+ has been measured in the presence of HEPES buffer medium, and a high paraCEST feature was discovered at both 37 and 25 °C. The pH variation paraCEST studies were carried out and the exchange rate constant of the probe at 37 and 25 °C was also determined. However, due to the fast exchange of water protons, the [Ni(PATA)(OH2)]2+ complex remained inactive in the CEST process.
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Affiliation(s)
- Suvam Kumar Panda
- Indian Institute of Technology Bhubaneswar, Khordha, Odisha, 752050, India.
| | - Ankit Rai
- Indian Institute of Technology Bhubaneswar, Khordha, Odisha, 752050, India.
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3
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Panda SK, Torres J, Kremer C, Singh AK. Comparative paraCEST effect of amide and hydroxy groups in divalent cobalt and nickel complexes of tripyridine-based ligands. Dalton Trans 2023; 52:13594-13607. [PMID: 37698164 DOI: 10.1039/d3dt01422c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
Co(II) and Ni(II) complexes of two tri-pyridine-based ligands with two hydroxy and two amide exchangeable protons (TDTA) and with six amide exchangeable protons (TMTP) were investigated for application as paraCEST-based magnetic resonance imaging (MRI) contrast agents. The two hydroxy groups present in the TDTA ligand were found to be passive while the amide group was active towards the CEST process. In the case of the Co(II) and Ni(II) complexes of the TMTP ligand, all three coordinated amide groups participated in the exchange process, and excellent CEST signals were observed. The X-ray structure of the four complexes revealed the seven-coordinate geometry of Co(II) complexes and the six-coordinate geometry of Ni(II) complexes. The presence of amide protons and hydroxy protons in the complexes was detected by the NMR method. The stability of the complexes in solution at high temperatures, in different pH ranges and acidic conditions, in the presence of competing cations, and biologically relevant anions was investigated. Potentiometric titrations were carried out to determine the ligand's protonation constants and the complexes' thermodynamic stability constant at 25.0 °C and I = 0.15 mol L-1 NaClO4. ParaCEST studies of [Co(TMTP)]2+ and [Ni(TMTP)]2+ at variable pH and variable pulse power are highlighted.
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Affiliation(s)
- Suvam Kumar Panda
- Indian Institute of Technology Bhubaneswar, Khordha, Odisha 752050, India.
| | - Julia Torres
- Área de Química Inorgánica - DEC, Facultad de Química, Universidad de la República, Montevideo, 11800, Uruguay
| | - Carlos Kremer
- Área de Química Inorgánica - DEC, Facultad de Química, Universidad de la República, Montevideo, 11800, Uruguay
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4
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Hydrolytic reactivity of novel copper(II) complexes with reduced N-salicylate threonine Schiff bases: distinguishable effects of various micelles. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Pradhan RN, Irrera P, Romdhane F, Panda SK, Longo DL, Torres J, Kremer C, Assaiya A, Kumar J, Singh AK. Di-Pyridine-Containing Macrocyclic Triamide Fe(II) and Ni(II) Complexes as ParaCEST Agents. Inorg Chem 2022; 61:16650-16663. [PMID: 36205705 DOI: 10.1021/acs.inorgchem.2c02242] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fe(II) and Ni(II) paraCEST contrast agents containing the di-pyridine macrocyclic ligand 2,2',2″-(3,7,10-triaza-1,5(2,6)-dipyridinacycloundecaphane-3,7,10-triyl)triacetamide (DETA) are reported here. Both [Fe(DETA)]2+ and [Ni(DETA)]2+ complexes were structurally characterized. Crystallographic data revealed the seven-coordinated distorted pentagonal bipyramidal geometry of the [Fe(DETA)]·(BF4)2·MeCN complex with five coordinated nitrogen atoms from the macrocyclic ring and two coordinated oxygen atoms from two amide pendant arms. The [Ni(DETA)]·Cl2·2H2O complex was six-coordinated in nature with a distorted octahedral geometry. Four coordinated nitrogen atoms were from the macrocyclic ring, and two coordinated oxygen atoms were from two amide pendant arms. [Fe(DETA)]2+ exhibited well-resolved sharp proton resonances, whereas very broad proton resonances were observed in the case of [Ni(DETA)]2+ due to the long electronic relaxation times. The CEST peaks for the [Fe(DETA)]2+ complex showed one highly downfield-shifted and intense peak at 84 ppm with another shifted but less intense peak at 28 ppm with good CEST contrast efficiency at body temperature, whereas [Ni(DETA)]2+ showed only one highly shifted intense peak at 78 ppm from the bulk water protons. Potentiometric titrations were performed to determine the protonation constants of the ligand and the thermodynamic stability constant of the [M(DETA)]2+ (M = Fe, Co, Ni, Cu, Zn) species at 25.0 °C and I = 0.15 mol·L-1 NaClO4. Metal exchange studies confirmed the stability of the complexes in acidic medium in the presence of physiologically relevant anions and an equimolar concentration of Zn(II) ions.
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Affiliation(s)
- Rabindra N Pradhan
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Pietro Irrera
- University of Campania "Luigi Vanvitelli", Caserta81100, Italy
| | - Feriel Romdhane
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Suvam Kumar Panda
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
| | - Dario Livio Longo
- Institute of Biostructures and Bioimaging (IBB), National Research Council of Italy (CNR), Torino10126, Italy
| | - Julia Torres
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Carlos Kremer
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Montevideo11800, Uruguay
| | - Anshul Assaiya
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Janesh Kumar
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune411 007, India
| | - Akhilesh K Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar752050, India
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Pandey S, Ghosh R, Ghosh A. Preparation of Hydrothermal Carbon Quantum Dots as a Contrast Amplifying Technique for the diaCEST MRI Contrast Agents. ACS OMEGA 2022; 7:33934-33941. [PMID: 36188278 PMCID: PMC9520682 DOI: 10.1021/acsomega.2c02911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
The discovery of exogenous contrast agents (CAs) is one of the key factors behind the success and widespread acceptability of MRI as an imaging tool. To the long list of CAs, the newest addition is the chemical exchange saturation transfer (CEST)-based CAs. Among them, the diaCEST CAs are the safer metal-free option constituted by a large pool of organic and macromolecules, but the tradeoff comes in terms of smaller natural offset. Another major challenge for the CEST CAs is that they need to operate in the tens of millimolar concentration range to produce any meaningful contrast. The quest for high efficiency diaCEST agents has led to a number of strategies such as use of hydrogen bonding, use of equivalent protons, and use of diatropic ring current. Here, we present carbon quantum dot formation using hydrothermal treatment as a new strategy to amplify diaCEST contrast efficiency. We show that while the well-known analgesic drug lidocaine hydrochloride when repurposed as a diaCEST CA produces no contrast at the physiological pH and temperature, the carbon dots prepared from it elevate the physiological contrast to a sizable 11%. Also, the maximum efficiency at an acidic pH gets amplified by a factor of 2 to 46%. The study showed that the enhancement in CEST efficiency is reproducible and the pH response of these carbon dots is tunable through variation in synthesis conditions such as temperature, duration, and precursor concentration.
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7
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Morrow JR, Raymond JJ, Chowdhury MSI, Sahoo PR. Redox-Responsive MRI Probes Based on First-Row Transition-Metal Complexes. Inorg Chem 2022; 61:14487-14499. [PMID: 36067522 DOI: 10.1021/acs.inorgchem.2c02197] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The presence of multiple oxidation and spin states of first-row transition-metal complexes facilitates the development of switchable MRI probes. Redox-responsive probes capitalize on a change in the magnetic properties of the different oxidation states of the paramagnetic metal ion center upon exposure to biological oxidants and reductants. Transition-metal complexes that are useful for MRI can be categorized according to whether they accelerate water proton relaxation (T1 or T2 agents), induce paramagnetic shifts of 1H or 19F resonances (paraSHIFT agents), or are chemical exchange saturation transfer (CEST) agents. The various oxidation state couples and their properties as MRI probes are summarized with a focus on Co(II)/Co(III) or Fe(II)/Fe(III) complexes as small molecules or as liposomal agents. Solution studies of these MRI probes are reviewed with an emphasis on redox changes upon treatment with oxidants or with enzymes that are physiologically important in inflammation and disease. Finally, we outline the challenges of developing these probes further for in vivo MRI applications.
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Affiliation(s)
- Janet R Morrow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Jaclyn J Raymond
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Md Saiful I Chowdhury
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
| | - Priya Ranjan Sahoo
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, New York 14260, United States
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Pérez-Lourido P, Madarasi E, Antal F, Esteban-Gómez D, Wang G, Angelovski G, Platas-Iglesias C, Tircsó G, Valencia L. Stable and inert macrocyclic cobalt(II) and nickel(II) complexes with paraCEST response. Dalton Trans 2022; 51:1580-1593. [PMID: 34991150 DOI: 10.1039/d1dt03217h] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We report the synthesis of the macrocyclic ligands 3,9-PC2AMH (2,2'-(3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-3,9-diyl)diacetamide) and 3,9-PC2AMtBu (2,2'-(3,6,9-triaza-1(2,6)-pyridinacyclodecaphane-3,9-diyl)bis(N-tert-butyl)acetamide) which contain a pyclen platform functionalized with acetamide or tert-butylacetamide pendant arms at positions 3 and 9 of the macrocyclic unit. The corresponding Co(II) and Ni(II) complexes were prepared, isolated and characterised as potential paramagnetic chemical exchange saturation transfer (paraCEST) agents. The X-ray structures of the Ni(II) complexes reveal six-coordination of the ligands to the metal ion. The Co(II) complex with 3,9-PC2AMtBu shows a similar six-coordinate structure in the solid state, while the Co(II) complex with 3,9-PC2AMH contains a seven-coordinate metal ion, seventh coordination being completed by the presence of an inner-sphere water molecule. The structure of the Co(II) complexes was investigated using 1H NMR spectroscopy and computational methods. The complexes present a seven-coordinate structure in solution, as demonstrated by the analysis of the paramagnetic shifts using density functional theory. Ligand protonation constants and stability constants of the complexes with 3,9-PC2AMH were determined using potentiometric titrations (I = 0,15 M NaCl). The Co(II) complex was found to be more stable than the Ni(II) analogue (log KCoL = 14.46(5) and log KNiL = 13.15(3)). However, the Ni(II) and Co(II) complexes display similar rate constants characterizing the proton-assisted dissociation mechanism. The presence of highly shifted 1H NMR signals due to the amide protons in slow exchange with bulk water results in sizeable CEST signals, which are observed at +67 and +15 ppm for the Co(II) complex with 3,9-PC2AMH and +42 and +7 ppm for the Ni(II) analogue at 25 °C.
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Affiliation(s)
- Paulo Pérez-Lourido
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain.
| | - Enikő Madarasi
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - Fanni Antal
- Doctoral School of Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Gaoji Wang
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, 72076 Tübingen, Germany.,Laboratory of Molecular and Cellular Neuroimaging, International Center for Primate Brain Research (ICPBR), Center for Excellence in Brain Science and Intelligence Technology (CEBSIT), Chinese Academy of Sciences (CAS), 20031 Shanghai, PR China
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Gyula Tircsó
- Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, H-4010, Debrecen, Egyetem tér 1, Hungary
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain.
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Chakraborty S, Peruncheralathan S, Ghosh A. Paracetamol and other acetanilide analogs as inter-molecular hydrogen bonding assisted diamagnetic CEST MRI contrast agents. RSC Adv 2021; 11:6526-6534. [PMID: 35423188 PMCID: PMC8694904 DOI: 10.1039/d0ra10410h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/29/2021] [Indexed: 12/12/2022] Open
Abstract
Paracetamol and a few other acetanilide derivatives are reported as a special class of diamagnetic Chemical Exchange Saturation Transfer (diaCEST) MRI contrast agents, that exhibit contrast only when the molecules form inter-molecular hydrogen bonding mediated molecular chains or sheets. Without the protection of the hydrogen bonding their contrast producing labile proton exchanges too quickly with the solvent to produce any appreciable contrast. Through a number of variable temperature experiments we demonstrate that under the conditions when the hydrogen bond network breaks and the high exchange returns back, the contrast drops quickly. The well-known analgesic drug paracetamol shows 12% contrast at a concentration of 15 mM at physiological conditions. With the proven safety track-record for human consumption and appreciable physiological contrast, paracetamol shows promise as a diaCEST agent for in vivo studies.
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Affiliation(s)
- Subhayan Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - S Peruncheralathan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
| | - Arindam Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI Bhubaneswar 752050 Odisha India
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Chakraborty S, Das M, Srinivasan A, Ghosh A. Tetrakis-( N-methyl-4-pyridinium)-porphyrin as a diamagnetic chemical exchange saturation transfer (diaCEST) MRI contrast agent. NEW J CHEM 2021. [DOI: 10.1039/d0nj04869k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Easily synthesizable tetrakis-(N-methyl-4-pyridinium)-porphyrin as a diaCEST agent that shows nearly pH independent good contrast in a wide range of pH.
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Affiliation(s)
- Subhayan Chakraborty
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
| | - Mainak Das
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
| | - A. Srinivasan
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
| | - Arindam Ghosh
- School of Chemical Sciences
- National Institute of Science Education and Research (NISER)
- HBNI
- Bhubaneswar 752050
- India
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Rodríguez-Rodríguez A, Zaiss M, Esteban-Gómez D, Angelovski G, Platas-Iglesias C. Paramagnetic chemical exchange saturation transfer agents and their perspectives for application in magnetic resonance imaging. INT REV PHYS CHEM 2020. [DOI: 10.1080/0144235x.2020.1823167] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Aurora Rodríguez-Rodríguez
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Moritz Zaiss
- Department of Neuroradiology, University Clinic Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Goran Angelovski
- MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, Tübingen, Germany
- Lab of Molecular and Cellular Neuroimaging, International Center for Primate Brain Research (ICPBR), Center for Excellence in Brain Science and Intelligence Technology (CEBSIT), Chinese Academy of Science (CAS), Shanghai, P.R. China
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias & Centro de Investigacións Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
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Abstract
The anchoring of lanthanide(III) chelates on the surface of mesoporous silica nanoparticles (MSNs) allowed their investigation as magnetic resonance imaging (MRI) and chemical exchange saturation transfer (CEST) contrast agents. Since their efficiency is strongly related to the interaction occurring between Ln-chelates and “bulk” water, an estimation of the water diffusion inside MSNs channels is very relevant. Herein, a method based on the exploitation of the CEST properties of TbDO3A-MSNs was applied to evaluate the effect of water diffusion inside MSN channels. Two MSNs, namely MCM-41 and SBA-15, with different pores size distributions were functionalized with TbDO3A-like chelates and polyethylene glycol (PEG) molecules and characterized by HR-TEM microscopy, IR spectroscopy, N2 physisorption, and thermogravimetric analysis (TGA). The different distribution of Tb-complexes in the two systems, mainly on the external surface in case of MCM-41 or inside the internal pores for SBA-15, resulted in variable CEST efficiency. Since water molecules diffuse slowly inside silica channels, the CEST effect of the LnDO3A-SBA-15 system was found to be one order of magnitude lower than in the case of TbDO3A-MCM-41. The latter system reaches an excellent sensitivity of ca. 55 ± 5 μM, which is useful for future theranostic or imaging applications.
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Snyder EM, Chowdhury MSI, Morrow JR. Co(II) and Fe(II) triazole-appended 4,10-diaza-15-crown-5-ether Macrocyclic complexes for CEST MRI applications. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abozeid SM, Asik D, Sokolow GE, Lovell JF, Nazarenko AY, Morrow JR. Co II Complexes as Liposomal CEST Agents. Angew Chem Int Ed Engl 2020; 59:12093-12097. [PMID: 32330368 PMCID: PMC7502271 DOI: 10.1002/anie.202003479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Indexed: 12/23/2022]
Abstract
Three paramagnetic CoII macrocyclic complexes containing 2-hydroxypropyl pendant groups, 1,1',1'',1'''-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetrakis- (propan-2-ol) ([Co(L1)]2+ , 1,1'-(4,11-dibenzyl-1,4,8,11-tetraazacyclotetradecane-1,8-diyl)bis(propan-2-ol) ([Co(L2)]2+ ), and 1,1'-(4,11-dibenzyl-1,4,8,11-tetraazacyclotetradecane-1,8-diyl)bis(octadecan-2-ol) ([Co(L3)]2+ ) were synthesized to prepare transition metal liposomal chemical exchange saturation transfer (lipoCEST) agents. In solution, ([Co(L1)]2+ ) forms two isomers as shown by 1 H NMR spectroscopy. X-ray crystallographic studies show one isomer with 1,8-pendants in cis-configuration and a second isomer with 1,4-pendants in trans-configuration. The [Co(L2)]2+ complex has 1,8-pendants in a cis-configuration. Remarkably, the paramagnetic-induced shift of water 1 H NMR resonances in the presence of the [Co(L1)]2+ complex is as large as that observed for one of the most effective LnIII water proton shift agents. Incorporation of [Co(L1)]2+ into the liposome aqueous core, followed by dialysis against a solution of 300 mOsm L-1 produces a CEST peak at 3.5 ppm. Incorporation of the amphiphilic [Co(L3)]2+ complex into the liposome bilayer produces a more highly shifted CEST peak at -13 ppm. Taken together, these data demonstrate the feasibility of preparing CoII lipoCEST agents.
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Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Didar Asik
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Gregory E. Sokolow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Jonathan F. Lovell
- Department of Biomedical Engineering, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
| | - Alexander Y. Nazarenko
- Chemistry Department, SUNY College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, United States
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, the State University of New York, Amherst, NY 14260, United States
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15
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Abozeid SM, Asik D, Sokolow GE, Lovell JF, Nazarenko AY, Morrow JR. Co
II
Complexes as Liposomal CEST Agents. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003479] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Didar Asik
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Gregory E. Sokolow
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
| | - Jonathan F. Lovell
- Department of Biomedical Engineering University at Buffalo The State University of New York Amherst NY 14260 USA
| | | | - Janet R. Morrow
- Department of Chemistry University at Buffalo, The State University of New York Amherst NY 14260 USA
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16
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Gupta A, Caravan P, Price WS, Platas-Iglesias C, Gale EM. Applications for Transition-Metal Chemistry in Contrast-Enhanced Magnetic Resonance Imaging. Inorg Chem 2020; 59:6648-6678. [PMID: 32367714 DOI: 10.1021/acs.inorgchem.0c00510] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Contrast-enhanced magnetic resonance imaging (MRI) is an indispensable tool for diagnostic medicine. However, safety concerns related to gadolinium in commercial MRI contrast agents have emerged in recent years. For patients suffering from severe renal impairment, there is an important unmet medical need to perform contrast-enhanced MRI without gadolinium. There are also concerns over the long-term effects of retained gadolinium within the general patient population. Demand for gadolinium-free MRI contrast agents is driving a new wave of inorganic chemistry innovation as researchers explore paramagnetic transition-metal complexes as potential alternatives. Furthermore, advances in personalized care making use of molecular-level information have motivated inorganic chemists to develop MRI contrast agents that can detect pathologic changes at the molecular level. Recent studies have highlighted how reaction-based modulation of transition-metal paramagnetism offers a highly effective mechanism to achieve MRI contrast enhancement that is specific to biochemical processes. This Viewpoint highlights how recent advances in transition-metal chemistry are leading the way for a new generation of MRI contrast agents.
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Affiliation(s)
- Abhishek Gupta
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | | | - William S Price
- Nanoscale Organisation and Dynamics Group, School of Science and Health, Western Sydney University, Penrith, New South Wales 2751, Australia.,Ingham Institute of Applied Medical Research, Liverpool, New South Wales 2170, Australia
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña, Galicia 15071, Spain
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17
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Álvarez-Miguel L, Álvarez-Miguel I, Martín-Álvarez JM, Álvarez CM, Rogez G, García-Rodríguez R, Miguel D. Copper complexes for the promotion of iminopyridine ligands derived from β-alanine and self-aldol additions: relaxivity and cytotoxic properties. Dalton Trans 2019; 48:17544-17555. [PMID: 31748774 DOI: 10.1039/c9dt03822a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In the study presented herein, we explore the ability of copper complexes with coordinated pyridine-2-carboxaldehyde (pyca) or 2-acetylpyridine (acepy) ligands to promote the addition of amines (Schiff condensation) and other nucleophiles such as alcohols (hemiacetal formation). Distinct reactivity patterns are observed: unlike pyca complexes, acepy copper complexes can promote self-aldol addition. The introduction of a flexible chain via Schiff condensation with β-alanine allows the possibility of chelate ring ring-opening processes mediated by pH. Further derivatization of the complex [CuCl(py-2-C(H)[double bond, length as m-dash]NCH2CH2COO)] is possible by replacing its chloride ligand with different pseudohalogens (N3-, NCO- and NCS-). In addition to the change in their magnetism, which correlates with their solid-state structures, more unexpected effects in their cytotoxicity and relaxitivities are observed, which determines their possibility to be used as MRI contrast agents. The replacement of a chloride by another pseudohalogen, although a simple strategy, can be used to critically change the cytotoxicity of the Schiff base copper(ii) complex and its selectivity towards specific cell lines.
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Affiliation(s)
- Lucía Álvarez-Miguel
- GIR MIOMET-IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belen 7, E-47011 Valladolid, Spain.
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18
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Patel A, Asik D, Spernyak JA, Cullen PJ, Morrow JR. MRI and fluorescence studies of Saccharomyces cerevisiae loaded with a bimodal Fe(III) T 1 contrast agent. J Inorg Biochem 2019; 201:110832. [PMID: 31522137 PMCID: PMC6859208 DOI: 10.1016/j.jinorgbio.2019.110832] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 09/03/2019] [Accepted: 09/05/2019] [Indexed: 12/30/2022]
Abstract
Labeling of cells with paramagnetic metal complexes produces changes in MRI properties that have applications in cell tracking and identification. Here we show that fungi, specifically the budding yeast Saccharomyces cerevisiae, can be loaded with Fe(III) T1 contrast agents. Two Fe(III) macrocyclic complexes based on 1,4,7-triazacyclononane, with two pendant alcohol groups are prepared and studied as T1 relaxation MRI probes. To better visualize uptake and localization in the yeast cells, Fe(III) complexes have a fluorescent tag, consisting of either carbostyril or fluoromethyl coumarin. The Fe(III) complexes are robust towards dissociation and produce moderate T1 effects, despite lacking inner-sphere water ligands. Fluorescence microscopy and MRI T1 relaxation studies provide evidence of uptake of an Fe(III) complex into Saccharomyces cerevisiae upon electroporation.
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Affiliation(s)
- Akanksha Patel
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, NY 14260, United States of America
| | - Didar Asik
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, NY 14260, United States of America
| | - Joseph A Spernyak
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Institute, Buffalo, NY 14263, United States of America
| | - Paul J Cullen
- Department of Biological Sciences, University at Buffalo, State University of New York, Amherst, NY 14260, United States of America
| | - Janet R Morrow
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, NY 14260, United States of America.
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19
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Pinto SM, Tomé V, Calvete MJ, Castro MMC, Tóth É, Geraldes CF. Metal-based redox-responsive MRI contrast agents. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.03.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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20
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Bond CJ, Sokolow GE, Crawley MR, Burns PJ, Cox JM, Mayilmurugan R, Morrow JR. Exploring Inner-Sphere Water Interactions of Fe(II) and Co(II) Complexes of 12-Membered Macrocycles To Develop CEST MRI Probes. Inorg Chem 2019; 58:8710-8719. [PMID: 31247845 DOI: 10.1021/acs.inorgchem.9b01072] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Several paramagnetic Co(II) and Fe(II) macrocyclic complexes were prepared with the goal of introducing a bound water ligand to produce paramagnetically shifted water 1H resonances and for paramagnetic chemical exchange saturation transfer (paraCEST) applications. Three 12-membered macrocycles with amide pendent groups including 1,7-bis(carbamoylmethyl)-1,4,7,10-tetraazacyclodocane (DCMC), 4,7,10-tris(carbamoylmethyl)-,4,7,10-triaza-12-crown-ether (N3OA), and 4,10-bis(carbamoylmethyl)-4,10-diaza-12-crown-ether (NODA) were prepared and their Co(II) complexes were characterized in the solid state and in solution. The crystal structure of [Co(DCMC)]Br2 featured a six-coordinated Co(II) center with distorted octahedral geometry, while [Co(NODA)(OH2)]Cl2 and [Co(N3OA)](NO3)2 were seven-coordinated. The analogous Fe(II) complexes of NODA and NO3A were successfully prepared, but the complex of DCMC oxidized rapidly to the Fe(III) form. Similarly, [Fe(NODA)]2+ oxidized over several days, forming crystals of the Fe(III) complex isolated as the μ-O bridged dimer. Magnetic susceptibility values and paramagnetic NMR spectra of the Fe(II) complexes of NODA and N3OA, as well as Co(II) complexes of DCMC, NODA, and N3OA, were consistent with high spin complexes. CEST peaks ranging from 60 ppm to 70 ppm, attributed to NH groups of the amide pendents, were identified. Variable-temperature 17O NMR spectra of Co(II) and Fe(II) NODA complexes were consistent with rapid exchange of the water ligand with bulk water. Notably, the Co(II) and Fe(II) complexes presented here produced substantial paramagnetic shifts of bulk water 1H resonances, independent of having an inner-sphere water.
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Affiliation(s)
- Christopher J Bond
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Gregory E Sokolow
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Matthew R Crawley
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Patrick J Burns
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Jordan M Cox
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Ramasamy Mayilmurugan
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
| | - Janet R Morrow
- Department of Chemistry , University at Buffalo, State University of New York , Amherst , New York 14260 , United States
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21
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Pradhan RN, Chakraborty S, Bharti P, Kumar J, Ghosh A, Singh AK. Seven coordinate Co(ii) and six coordinate Ni(ii) complexes of an aromatic macrocyclic triamide ligand as paraCEST agents for MRI. Dalton Trans 2019; 48:8899-8910. [PMID: 31140528 DOI: 10.1039/c9dt00747d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We are reporting Co(ii) and Ni(ii) complexes of a pyridine containing aromatic macrocyclic triamide ligand, 3,6,9,15-tetraazabicyclo(9.3.1)pentadeca-1(15),11,13-triene-3,6,9-triacetamide (TPTA), as paramagnetic chemical exchange saturation transfer (paraCEST) MRI contrast agents. The synthesis and characterization of TPTA and its complexes are reported. The solution chemistry and solid-state structure of Co(ii) and Ni(ii) complexes are studied. Crystallographic data show that the [Co(TPTA)]·Cl2·2H2O complex (seven-coordinate, all four N atoms of ring and three amide O atoms) has a distorted pentagonal bipyramidal geometry, however the [Ni(TPTA)Cl]·Cl·0.25H2O complex (six-coordinate, all four N atoms of the ring, one amide O and one chloride ion) adopts a distorted octahedral geometry. Notably the two pendent amide arms are not coordinated in the [Ni(TPTA)Cl]+ complex and one chloride ion fulfils its sixth coordination. The CEST effect of [Co(TPTA)]2+ and [Ni(TPTA)Cl]+ amide protons is observed at 57 ppm and 78 ppm downfield of the bulk water proton respectively in a buffer solution containing 20 mM N-(2-hydroxyethyl)piperazine-N'-ethanesulfonic acid and 100 mM NaCl at pH 7.4 at 37 °C on a 9.4 T NMR spectrometer. The effects of CEST intensity and exchange rate constant with variation of pH of the solution were studied. The CEST effect and exchange rate constant for the amide protons of the [Co(TPTA)]2+ complex have been monitored in HEPES buffer, fetal bovine serum (FBS), rabbit serum and 4% agarose gel (w/w). The stability of the [Co(TPTA)]2+ complex in aqueous solution towards oxidation was verified by cyclic voltammetry measurement. The stability of [Co(TPTA)]2+ has further been monitored in the presence of biologically relevant ions including HPO42-, CO32-, and Zn2+ and under acidic conditions.
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Affiliation(s)
- Rabindra N Pradhan
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India.
| | - Subhayan Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research (HBNI) Bhubaneswar, 752050, India.
| | - Pratibha Bharti
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune 411 007, India
| | - Janesh Kumar
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune 411 007, India
| | - Arindam Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research (HBNI) Bhubaneswar, 752050, India.
| | - Akhilesh K Singh
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 752050, India.
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22
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Scepaniak JJ, Kang EB, John M, Kaminsky W, Dechert S, Meyer F. Non‐Macrocyclic Schiff Base Complexes of Iron(II) as ParaCEST Agents for MRI. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jeremiah J. Scepaniak
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
- Department of Chemistry Drexel University 32 S. 32nd St. Disque Hall 506 19104 Philadelphia PA USA
| | - Eun Byoung Kang
- Department of Chemistry Drexel University 32 S. 32nd St. Disque Hall 506 19104 Philadelphia PA USA
| | - Michael John
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Werner Kaminsky
- Department of Chemistry University of Washington Box 351700 98195‐1700 Seattle WA USA
| | - Sebastian Dechert
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
| | - Franc Meyer
- Institut für Anorganische Chemie Georg‐August‐Universität Göttingen Tammannstrasse 4 37077 Göttingen Germany
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23
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Banerjee A, Li J, Easley CR, Brennessel WW, Loloee R, Chavez FA. Synthesis, structure, and characterization of tris(1-ethyl-4-isopropyl-imidazolyl-қN)phosphine nickel(II) complexes. Inorganica Chim Acta 2019; 489:170-179. [DOI: 10.1016/j.ica.2019.02.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Thorarinsdottir AE, Tatro SM, Harris TD. Electronic Effects of Ligand Substitution in a Family of CoII2 PARACEST pH Probes. Inorg Chem 2018; 57:11252-11263. [DOI: 10.1021/acs.inorgchem.8b01896] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
| | - Scott M. Tatro
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - T. David Harris
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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25
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Tsitovich PB, Gendron F, Nazarenko AY, Livesay BN, Lopez AP, Shores MP, Autschbach J, Morrow JR. Low-Spin Fe(III) Macrocyclic Complexes of Imidazole-Appended 1,4,7-Triazacyclononane as Paramagnetic Probes. Inorg Chem 2018; 57:8364-8374. [DOI: 10.1021/acs.inorgchem.8b01022] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Pavel B. Tsitovich
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Frédéric Gendron
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Alexander Y. Nazarenko
- Chemistry Department, State University of New York, College at Buffalo, 1300 Elmwood Avenue, Buffalo, New York 14222, United States
| | - Brooke N. Livesay
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Alejandra P. Lopez
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Matthew P. Shores
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
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26
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Abozeid SM, Snyder EM, Lopez AP, Steuerwald CM, Sylvester E, Ibrahim KM, Zaky RR, Abou‐El‐Nadar HM, Morrow JR. Nickel(II) Complexes as Paramagnetic Shift and paraCEST Agents. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Samira M. Abozeid
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
- Department of Chemistry Faculty of Science Mansoura University El‐Gomhoria Street 35516 Mansoura Egypt
| | - Eric M. Snyder
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
| | - Alejandra P. Lopez
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
| | - Charles M. Steuerwald
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
| | - Eric Sylvester
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
| | - Kamal M. Ibrahim
- Department of Chemistry Faculty of Science Mansoura University El‐Gomhoria Street 35516 Mansoura Egypt
| | - Rania R. Zaky
- Department of Chemistry Faculty of Science Mansoura University El‐Gomhoria Street 35516 Mansoura Egypt
| | - Hamed M. Abou‐El‐Nadar
- Department of Chemistry Faculty of Science Mansoura University El‐Gomhoria Street 35516 Mansoura Egypt
| | - Janet R. Morrow
- University at Buffalo, State University of New York Department of Chemistry 526 Natural Sciences Complex 14260 Amherst NY USA
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27
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Ogawa R, Sunatsuki Y, Suzuki T. Schiff Base Ligands Derived from l
-Histidine Methyl Ester: Characterization, Racemization, and Dimerization of Their Transition-Metal Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rina Ogawa
- Department of Chemistry; Graduate School of Natural Science and Technology; Okayama University; 700-8530 Okayama Japan
| | - Yukinari Sunatsuki
- Department of Chemistry; Graduate School of Natural Science and Technology; Okayama University; 700-8530 Okayama Japan
| | - Takayoshi Suzuki
- Department of Chemistry; Graduate School of Natural Science and Technology; Okayama University; 700-8530 Okayama Japan
- Research Institute for Interdisciplinary Science; Okayama University; 700-8530 Okayama Japan
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28
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Abozeid SM, Snyder EM, Tittiris TY, Steuerwald CM, Nazarenko AY, Morrow JR. Inner-Sphere and Outer-Sphere Water Interactions in Co(II) paraCEST Agents. Inorg Chem 2018; 57:2085-2095. [DOI: 10.1021/acs.inorgchem.7b02977] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Samira M. Abozeid
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Eric M. Snyder
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Timothy Y. Tittiris
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Charles M. Steuerwald
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
| | - Alexander Y. Nazarenko
- Chemistry Department, SUNY College at Buffalo, 1300 Elmwood Avenue, Buffalo, New York 14222, United States
| | - Janet R. Morrow
- Department of Chemistry, University at Buffalo, State University of New York, Amherst, New York 14260, United States
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29
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Thorarinsdottir AE, Du K, Collins JHP, Harris TD. Ratiometric pH Imaging with a CoII2 MRI Probe via CEST Effects of Opposing pH Dependences. J Am Chem Soc 2017; 139:15836-15847. [DOI: 10.1021/jacs.7b08574] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | - Kang Du
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - James H. P. Collins
- Advanced
Magnetic Resonance Imaging and Spectroscopy Facility, University of Florida, Gainesville, Florida 32611, United States
| | - T. David Harris
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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30
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Srivastava K, Ferrauto G, Young VG, Aime S, Pierre VC. Eight-Coordinate, Stable Fe(II) Complex as a Dual 19F and CEST Contrast Agent for Ratiometric pH Imaging. Inorg Chem 2017; 56:12206-12213. [DOI: 10.1021/acs.inorgchem.7b01629] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Kriti Srivastava
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Giuseppe Ferrauto
- Molecular Imaging Center, Department of Molecular Biotechnologies & Health Sciences, University of Torino, 10126 Torino, Italy
| | - Victor G. Young
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Silvio Aime
- Molecular Imaging Center, Department of Molecular Biotechnologies & Health Sciences, University of Torino, 10126 Torino, Italy
| | - Valérie C. Pierre
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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