1
|
Neumann T, Thompson BC, Hebron D, Graycon DM, Collauto A, Roessler MM, Wilson DWN, Musgrave RA. Heterobimetallic 3d-4f complexes supported by a Schiff-base tripodal ligand. Dalton Trans 2024; 53:9921-9932. [PMID: 38808633 DOI: 10.1039/d3dt03760f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Complexes featuring multiple metal centres are of growing interest regarding metal-metal cooperation and its tuneability. Here the synthesis and characterisation of heterobimetallic complexes of a 3d metal (4: Mn, 5: Co) and lanthanum supported by a (1,1,1-tris[(3-methoxysalicylideneamino)methyl]ethane) ligand is reported, as well as discussion of their electronic structure via electron paramagnetic resonance (EPR) spectroscopy, electrochemical experiments and computational studies. Competitive binding experiments of the ligand and various metal salts unequivocally demonstrate that in these heterobimetallic complexes the 3d metal (Mn, Co) selectively occupies the κ6-N3O3 binding site of the ligand, whilst La occupies the κ6-O6 metal binding site in line with their relative oxophilicities. EPR spectroscopy supported by density functional theory analysis indicates that the 3d metal is high spin in both cases (S = 5/2 (Mn), 3/2 (Co)). Cyclic voltammetry studies on the Mn/La and Co/La bimetallic complexes revealed a quasi-reversible Mn2+/3+ redox process and poorly-defined irreversible oxidation events respectively.
Collapse
Affiliation(s)
- Till Neumann
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| | - Benedict C Thompson
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| | - Denny Hebron
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| | - Daniel M Graycon
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| | - Alberto Collauto
- Molecular Sciences Research Hub, Department of Chemistry, Imperial College London, 82 Wood Lane, London, W12 0BZ, UK
| | - Maxie M Roessler
- Molecular Sciences Research Hub, Department of Chemistry, Imperial College London, 82 Wood Lane, London, W12 0BZ, UK
| | - Daniel W N Wilson
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| | - Rebecca A Musgrave
- Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London, SE1 1DB, UK.
| |
Collapse
|
2
|
Brown AM, Butman JL, Lengacher R, Vargo NP, Martin KE, Koller A, Śmiłowicz D, Boros E, Robinson JR. N, N-Alkylation Clarifies the Role of N- and O-Protonated Intermediates in Cyclen-Based 64Cu Radiopharmaceuticals. Inorg Chem 2023; 62:1362-1376. [PMID: 36490364 DOI: 10.1021/acs.inorgchem.2c02907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Radioisotopes of Cu, such as 64Cu and 67Cu, are alluring targets for imaging (e.g., positron emission tomography, PET) and radiotherapeutic applications. Cyclen-based macrocyclic polyaminocarboxylates are one of the most frequently examined bifunctional chelators in vitro and in vivo, including the FDA-approved 64Cu radiopharmaceutical, Cu(DOTATATE) (Detectnet); however, connections between the structure of plausible reactive intermediates and their stability under physiologically relevant conditions remain to be established. In this study, we share the synthesis of a cyclen-based, N,N-alkylated spirocyclic chelate, H2DO3AC4H8, which serves as a model for N-protonation. Our combined experimental (in vitro and in vivo) and computational studies unravel complex pH-dependent speciation and enable side-by-side comparison of N- and O-protonated species of relevant 64Cu radiopharmaceuticals. Our studies suggest that N-protonated species are not inherently unstable species under physiological conditions and demonstrate the potential of N,N-alkylation as a tool for the rational design of future radiopharmaceuticals.
Collapse
Affiliation(s)
- Alexander M Brown
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| | - Jana L Butman
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| | - Raphael Lengacher
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York11794, United States
| | - Natasha P Vargo
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| | - Kirsten E Martin
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York11794, United States
| | - Angus Koller
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York11794, United States
| | - Dariusz Śmiłowicz
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York11794, United States
| | - Eszter Boros
- Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, New York11794, United States
| | - Jerome R Robinson
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| |
Collapse
|
3
|
Connolly BJP, Brosius V, Mertes N, Demidova C, Bilyj JK, Riley MJ, Bernhardt PV. Temperature and Counterion Dependent Spin Crossover in a Hexaamineiron(II) Complex. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Blake J. P. Connolly
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Victor Brosius
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Nicole Mertes
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Caroline Demidova
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Jessica K. Bilyj
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Mark J. Riley
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Australia
| |
Collapse
|
4
|
Abstract
Studying the correlation between temperature-driven molecular structure and nuclear spin dynamics is essential to understanding fundamental design principles for thermometric nuclear magnetic resonance spin-based probes. Herein, we study the impact of progressively encapsulating ligands on temperature-dependent 59Co T 1 (spin-lattice) and T 2 (spin-spin) relaxation times in a set of Co(III) complexes: K3[Co(CN)6] (1); [Co(NH3)6]Cl3 (2); [Co(en)3]Cl3 (3), en = ethylenediamine); [Co(tn)3]Cl3 (4), tn = trimethylenediamine); [Co(tame)2]Cl3 (5), tame = triaminomethylethane); and [Co(dinosar)]Cl3 (6), dinosar = dinitrosarcophagine). Measurements indicate that 59Co T 1 and T 2 increase with temperature for 1-6 between 10 and 60 °C, with the greatest ΔT 1/ΔT and ΔT 2/ΔT temperature sensitivities found for 4 and 3, 5.3(3)%T 1/°C and 6(1)%T 2/°C, respectively. Temperature-dependent T 2* (dephasing time) analyses were also made, revealing the highest ΔT 2*/ΔT sensitivities in structures of greatest encapsulation, as high as 4.64%T 2*/°C for 6. Calculations of the temperature-dependent quadrupolar coupling parameter, Δe 2 qQ/ΔT, enable insight into the origins of the relative ΔT 1/ΔT values. These results suggest tunable quadrupolar coupling interactions as novel design principles for enhancing temperature sensitivity in nuclear spin-based probes.
Collapse
|
5
|
Astakhov G, Levitsky M, Bantreil X, Lamaty F, Khrustalev V, Zubavichus Y, Dorovatovskii P, Shubina E, Bilyachenko A. Cu(II)-silsesquioxanes as efficient precatalysts for Chan-Evans-Lam coupling. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
6
|
Alcock LJ, Cavigliasso G, Lawes DJ, Stranger R, Hook JM, Ralph SF. Dynamic solution behaviour of metal complexes of the hexaamine cage ligand Me8tricosane. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
7
|
Paúrová M, Císařová I, Lukeš I, Kotek J. Transition metal complexes of tris(aminomethyl)phosphine oxide (tampo) – Thermodynamic and X-ray diffraction studies. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
8
|
Pérez Mayoral E, Soriano E, Calvino-Casilda V, Rojas-Cervantes M, Martín-Aranda R. Silica-based nanocatalysts in the C C and C-heteroatom bond forming cascade reactions for the synthesis of biologically active heterocyclic scaffolds. Catal Today 2017. [DOI: 10.1016/j.cattod.2017.01.048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
9
|
Ke YT, Chou WT, Chiang YF, Hsieh CC, Horng YC. Efficient and selective separation of aqueous sulfate through recognition and precipitation. NEW J CHEM 2017. [DOI: 10.1039/c6nj03710k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Sulfate anions are selectively separated from aqueous solution in the form of precipitates by a mono-protonated organic receptor, constructed in situ through anion-templated chemical synthesis.
Collapse
Affiliation(s)
- Ya-Ting Ke
- Department of Chemistry
- National Changhua University of Education
- Changhua 50058
- Taiwan
| | - Wei-Tzu Chou
- Department of Chemistry
- National Changhua University of Education
- Changhua 50058
- Taiwan
| | - Yi-Fen Chiang
- Department of Chemistry
- National Changhua University of Education
- Changhua 50058
- Taiwan
| | - Chang-Chih Hsieh
- Department of Chemistry
- National Changhua University of Education
- Changhua 50058
- Taiwan
| | - Yih-Chern Horng
- Department of Chemistry
- National Changhua University of Education
- Changhua 50058
- Taiwan
| |
Collapse
|
10
|
Alcock LJ, Cavigliasso G, Willis AC, Stranger R, Ralph SF. Trigonal prismatic metal complexes: a not so rare coordination geometry? Dalton Trans 2016; 45:9036-40. [PMID: 27125359 DOI: 10.1039/c6dt01176d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solid state structures of two metal complexes of a hexaamine macrobicyclic ligand, in which the metal ion has an exact trigonal prismatic geometry, have been determined. Theoretical calculations showed this is the most stable geometry for d(0), d(10) and high spin d(5) metal complexes of the ligand with M-N bond distances >∼2.35 Å.
Collapse
Affiliation(s)
- Leighton J Alcock
- School of Chemistry, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia.
| | - Germán Cavigliasso
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - Anthony C Willis
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - Robert Stranger
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - Stephen F Ralph
- School of Chemistry, University of Wollongong, Northfields Avenue, Wollongong 2522, Australia.
| |
Collapse
|
11
|
Bardajee GR, Mohammadi M, Kakavand N. Copper(II)-diaminosarcophagine-functionalized SBA-15: a heterogeneous nanocatalyst for the synthesis of benzimidazole, benzoxazole and benzothiazole derivatives under solvent-free conditions. Appl Organomet Chem 2015. [DOI: 10.1002/aoc.3400] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Marzieh Mohammadi
- Department of Chemistry; Faculty of Science; Urmia University; 57159 Urmia Iran
| | - Nahale Kakavand
- Department of Chemistry; Payame Noor University (PNU); PO Box 19395-3697 Tehran Iran
| |
Collapse
|
12
|
Mohammadi M, Bardajee GR, Pesyan NN. Efficient solvent-free synthesis of pyridopyrazine and quinoxaline derivatives using copper-DiAmSar complex anchored on SBA-15 as a reusable catalyst. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(15)60845-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
13
|
|
14
|
Algarra AG, Aullón G, Bernhardt PV, Martínez M. Computational Insights on the Geometrical Arrangements of Cu(II) with a Mixed-Donor N3S3 Macrobicyclic Ligand. Inorg Chem 2013; 53:512-21. [DOI: 10.1021/ic402533j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrés G. Algarra
- Departamento de Ciencia de los Materiales
e Ingeniería Metalúrgica y Química Inorgánica,
Facultad de Ciencias, Universidad de Cádiz, Apartado 40, Puerto Real, 11510 Cádiz, Spain
| | - Gabriel Aullón
- Departament de Química Inorgànica,
Facultat de Química, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Paul V. Bernhardt
- School of Chemistry
and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia
| | - Manuel Martínez
- Departament de Química Inorgànica,
Facultat de Química, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| |
Collapse
|
15
|
Reversible Rearrangements of Cu(II) Cage Complexes: Solvent and Anion Influences. Inorg Chem 2012; 51:12372-9. [DOI: 10.1021/ic301696v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
16
|
Frank P, Benfatto M, Hedman B, Hodgson KO. The X-ray absorption spectroscopic model of the copper(II) imidazole complex ion in liquid aqueous solution: a strongly solvated square pyramid. Inorg Chem 2012; 51:2086-96. [PMID: 22316238 PMCID: PMC3328689 DOI: 10.1021/ic2017819] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cu K-edge extended X-ray absorption fine structure (EXAFS) and Minuit X-ray absorption near-edge structure (MXAN) analyses were combined to evaluate the structure of the copper(II) imidazole complex ion in liquid aqueous solution. Both methods converged to the same square-pyramidal inner coordination sphere [Cu(Im)(4)L(ax)](2+) (L(ax) indeterminate) with four equatorial nitrogen atoms at EXAFS, 2.02 ± 0.01 Å, and MXAN, 1.99 ± 0.03 Å. A short-axial N/O scatterer (L(ax)) was found at 2.12 ± 0.02 Å (EXAFS) or 2.14 ± 0.06 Å (MXAN). A second but very weak axial Cu-N/O interaction was found at 2.9 ± 0.1 Å (EXAFS) or 3.0 ± 0.1 Å (MXAN). In the MXAN fits, only a square-pyramidal structural model successfully reproduced the doubled maximum of the rising K-edge X-ray absorption spectrum, specifically excluding an octahedral model. Both EXAFS and MXAN also found eight outlying oxygen scatterers at 4.2 ± 0.3 Å that contributed significant intensity over the entire spectral energy range. Two prominent rising K-edge shoulders at 8987.1 and 8990.5 eV were found to reflect multiple scattering from the 3.0 Å axial scatterer and the imidazole rings, respectively. In the MXAN fits, the imidazole rings took in-plane rotationally staggered positions about copper. The combined (EXAFS and MXAN) model for the unconstrained cupric imidazole complex ion in liquid aqueous solution is an axially elongated square-pyramidal core, with a weak nonbonded interaction at the second axial coordination position and a solvation shell of eight nearest-neighbor water molecules. This core square-pyramidal motif has persisted through [Cu(H(2)O)(5)](2+), [Cu(NH(3))(4)(NH(3),H(2)O)](2+), (1, 2) and now [Cu(Im)(4)L(ax))](2+) and appears to be the geometry preferred by unconstrained aqueous-phase copper(II) complex ions.
Collapse
Affiliation(s)
- Patrick Frank
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States.
| | | | | | | |
Collapse
|