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Miyamoto S, Nagata K, Yoshimura T. Luminescence Color and Intensity Changes of Nitridorhenium(V) Complexes Induced by Protonation/Deprotonation on the Bidentate Azolylpyridine Ligands. Inorg Chem 2023; 62:17641-17653. [PMID: 37844419 DOI: 10.1021/acs.inorgchem.3c02149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Tricyanidonitridorhenium(V) complexes with azolylpyridines, namely, [ReN(CN)3(H-N2py)]- (1-H, H-N2py = 2-(3-pyrazolyl)pyridine) and [ReN(CN)3(L)]2- (2-a, L = 2-[1,2,3]-triazol-4-yl-pyridine anion (N3py-), and 3-a, that is, L = 2-(tetrazol-5-yl)-pyridine anion (N4py-)), were newly synthesized and characterized. The structures of the new complexes were determined by single-crystal X-ray analysis. The 1-H complex includes two geometrical isomers in which an isomer is the conformation with the pyridyl (py) and pyrazolyl (pyrz) moieties of H-N2py occupying the trans site to the nitrido (the ax site) and the trans site to the cyanido (the eq site), respectively, in a bidentate fashion; the other isomer is the py and pyrz moieties coordinated to the eq and ax sites. In 2-a and 3-a, the triazolyl (trz) and tetrazoly (tetrz) moieties in N3py- and N4py- occupy the eq site, and the py moieties in N3py- and N4py- coordinate to the ax site. The complex 1-H is deprotonated upon the addition of 1,8-diazabicyclo[5.4.0]undec-7-one or NaOH to produce [ReN(CN)3(N2py)]2- (1-a), and 2-a is protonated upon the addition of p-toluene sulfonic acid (TsOH) to give [ReN(CN)3(H-N3py)]- (2-H) in DMSO. The protonation reaction does not occur for 3-a with TsOH in DMSO. All the complexes show one-electron redox waves of the Re(VI)/Re(V) and azolylpyridine ligand-centered processes in 0.1 M (n-C4H9)4NPF6-DMSO. All the complexes exhibit photoluminescence in DMSO and in the crystalline phase at 296 K. The emissive excited states of the complexes in DMSO were assigned to MLCT with a spin triplet nature. The emission band shifts to shorter and longer wavelengths upon protonation and deprotonation of the coordinated azolylpyridines, respectively. The emission color and intensity changes of 2-H and 2-a in the presence of acidic and basic vapors were investigated.
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Affiliation(s)
- Sodai Miyamoto
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Kojiro Nagata
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Takashi Yoshimura
- Radioisotope Research Center, Institute for Radiation Sciences, Osaka University, Suita 565-0871, Japan
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2
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Fundamentals of Rhenium-188 Radiopharmaceutical Chemistry. Molecules 2023; 28:molecules28031487. [PMID: 36771153 PMCID: PMC9921938 DOI: 10.3390/molecules28031487] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/29/2023] [Accepted: 01/30/2023] [Indexed: 02/05/2023] Open
Abstract
The β- emitter, rhenium-188 (188Re), has long been recognized as an attractive candidate for targeted cancer radionuclide therapy (TRNT). This transition metal shares chemical similarities with its congener element technetium, whose nuclear isomer technetium-99m (99mTc) is the current workhorse of diagnostic nuclear medicine. The differences between these two elements have a significant impact on the radiolabelling methods and should always receive critical attention. This review aims to highlight what needs to be considered to design a successful radiopharmaceutical incorporating 118Re. Some of the most effective strategies for preparing therapeutic radiopharmaceuticals with 188Re are illustrated and rationalized using the concept of the inorganic functional group (core) and a simple ligand field theoretical model combined with a qualitative definition of frontiers orbitals. Of special interest are the Re(V) oxo and Re(V) nitrido functional groups. Suitable ligands for binding to these cores are discussed, successful clinical applications are summarized, and a prediction of viable future applications is presented. Rhenium-188 decays through the emission of a high energy beta particle (2.12 MeV max energy) and a half-life of 16.9 h. An ideal biological target would therefore be a high-capacity target site (transporters, potential gradients, tumour microenvironment) with less emphasis on saturable targets such as overexpressed receptors on smaller metastases.
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Pandey MK, Kote BS, Mondal D, Kunchur HS, Radhakrishna L, Balakrishna MS. Transition Metal Complexes of 2,6‐Dibenzhydryl Derived Bisphosphine: Synthesis, Structural Studies and Palladium Complex Promoted Suzuki‐Miyaura Reactions. ChemistrySelect 2022. [DOI: 10.1002/slct.202201245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Madhusudan K. Pandey
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Basvaraj S. Kote
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Dipanjan Mondal
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Harish S. Kunchur
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Latchupatula Radhakrishna
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Maravanji S. Balakrishna
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
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Cooper SM, White AJP, Eykyn TR, Ma MT, Miller PW, Long NJ. N-Centered Tripodal Phosphine Re(V) and Tc(V) Oxo Complexes: Revisiting a [3 + 2] Mixed-Ligand Approach. Inorg Chem 2022; 61:8000-8014. [PMID: 35544683 PMCID: PMC9131457 DOI: 10.1021/acs.inorgchem.2c00693] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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N-Triphos derivatives
(NP3R, R = alkyl, aryl)
and asymmetric variants (NP2RXR′, R′ = alkyl, aryl, X = OH, NR2, NRR′) are
an underexplored class of tuneable, tripodal ligands in relation to
the coordination chemistry of Re and Tc for biomedical applications.
Mixed-ligand approaches are a flexible synthetic route to obtain Tc
complexes of differing core structures and physicochemical properties.
Reaction of the NP3Ph ligand with the Re(V)
oxo precursor [ReOCl3(PPh3)2] generated
the bidentate complex [ReOCl3(κ2-NP2PhOHAr)], which possesses an unusual
AA’BB’XX’ spin system with a characteristic second-order
NMR lineshape that is sensitive to the bi- or tridentate nature of
the coordinating diphosphine unit. The use of the asymmetric NP2PhOHAr ligand resulted in the formation
of both bidentate and tridentate products depending on the presence
of base. The tridentate Re(V) complex [ReOCl2(κ3-NP2PhOAr)] has provided
the basis of a new reactive “metal-fragment” for further
functionalization in [3 + 2] mixed-ligand complexes. The synthesis
of [3 + 2] complexes with catechol-based π-donors could also
be achieved under one-pot, single-step conditions from Re(V) oxo precursors.
Analogous complexes can also be synthesized from suitable 99Tc(V) precursors, and these complexes have been shown to exhibit
highly similar structural properties through spectroscopic and chromatographic
analysis. However, a tendency for the {MVO}3+ core to undergo hydrolysis to the {MVO2}+ core has been observed both in the case of M = Re and markedly
for M = 99Tc complexes. It is likely that controlling this
pathway will be critical to the generation of further stable Tc(V)
derivatives. An N-centered tripodal heterofunctionalized
phosphine ligand
was used to generate a reactive “metal-fragment” based
on the {MVO}3+ (M = Re, 99Tc) core
for the formation of mixed-ligand [3 + 2] complexes. Characteristic
lineshapes arising from an AA’BB’XX’ spin system
are diagnostic of bidentate vs tridentate coordination modes of the
ligand.
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Affiliation(s)
- Saul M Cooper
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK.,School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Andrew J P White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
| | - Thomas R Eykyn
- School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Michelle T Ma
- School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Philip W Miller
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
| | - Nicholas J Long
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
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Impact of Different [Tc(N)PNP]-Scaffolds on the Biological Properties of the Small cRGDfK Peptide: Synthesis, In Vitro and In Vivo Evaluations. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27082548. [PMID: 35458745 PMCID: PMC9029856 DOI: 10.3390/molecules27082548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/06/2022] [Accepted: 04/12/2022] [Indexed: 11/16/2022]
Abstract
Background: The [99mTc][Tc(N)(PNP)] system, where PNP is a bisphosphinoamine, is an interesting platform for the development of tumor ‘receptor-specific’ agents. Here, we compared the reactivity and impact of three [Tc(N)(PNP)] frameworks on the stability, receptor targeting properties, biodistribution, and metabolism of the corresponding [99mTc][Tc(N)(PNP)]-tagged cRGDfK peptide to determine the best performing agent and to select the framework useful for the preparation of [99mTc][Tc(N)(PNP)]-housing molecular targeting agents. Methods: cRGDfK pentapeptide was conjugated to Cys and labeled with each [Tc(N)(PNP)] framework. Radioconjugates were assessed for their lipophilicity, stability, in vitro and in vivo targeting properties, and performance. Results: All compounds were equally synthetically accessible and easy to purify (RCY ≥ 95%). The main influences of the synthon on the targeting peptide were observed in in vitro cell binding and in vivo. Conclusions: The variation in the substituents on the phosphorus atoms of the PNP enables a fine tuning of the biological features of the radioconjugates. ws[99mTc][Tc(N)(PNP3OH)]– and [99mTc][Tc(N)(PNP3)]– are better performing synthons in terms of labeling efficiency and in vivo performance than the [99mTc][Tc(N)(PNP43)] framework and are therefore more suitable for further radiopharmaceutical purposes. Furthermore, the good labeling properties of the ws[99mTc][Tc(N)(PNP3OH)]– framework can be exploited to extend this technology to the labeling of temperature-sensitive biomolecules suitable for SPECT imaging.
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Kishino M, Takaoka S, Shibutani Y, Kusumoto S, Nozaki K. Synthesis and reactivity of PC(sp 3)P-pincer iridium complexes bearing a diborylmethyl anion. Dalton Trans 2022; 51:5009-5015. [PMID: 35296874 DOI: 10.1039/d2dt00513a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel PCP-pincer iridium complexes bearing a diborylmethyl anion were synthesized. Strong σ-electron-donation to the metal and significant π-backdonation from the metal to boron atoms at the β-position were observed both experimentally and computationally. H/D exchange of the aromatic C-H bond proceeded smoothly and, in addition, the α-methine-hydrogen between boron atoms was found to be replaced with deuterium in benzene-d6 solution possibly through diborylcarbene metal complexes as intermediates.
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Affiliation(s)
- Masamichi Kishino
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Satoko Takaoka
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Yuki Shibutani
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Shuhei Kusumoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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Bolzati C, Salvarese N, Spolaore B, Vittadini A, Forrer D, Brunello S, Ghiani S, Maiocchi A. Water-Soluble [Tc(N)(PNP)] Moiety for Room-Temperature 99mTc Labeling of Sensitive Target Vectors. Mol Pharm 2022; 19:876-894. [DOI: 10.1021/acs.molpharmaceut.1c00816] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Cristina Bolzati
- Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy
| | - Nicola Salvarese
- Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy
| | - Barbara Spolaore
- Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Via Marzolo, 5, I-35131 Padova, Italy
- CRIBI Biotechnology Center, University of Padua, 35121 Padova, Italy
| | - Andrea Vittadini
- Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy
- Department of Chemical Sciences, University of Padua, Via Marzolo, 1, I-35131 Padova, Italy
| | - Daniel Forrer
- Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy
- Department of Chemical Sciences, University of Padua, Via Marzolo, 1, I-35131 Padova, Italy
| | - Sara Brunello
- Institute of Condensed Matter Chemistry and Technologies for Energy ICMATE-CNR, Corso Stati Uniti, 4, I-35127 Padova, Italy
| | - Simona Ghiani
- Bracco Imaging SpA, Bioindustry Park del Canavese, Via Ribes 5, Colleretto Giacosa, 10010 Torino, Italy
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8
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Roca Jungfer M, Abram U. [Tc(OH 2)(CO) 3(PPh 3) 2] +: A Synthon for Tc(I) Complexes and Its Reactions with Neutral Ligands. Inorg Chem 2021; 60:16734-16753. [PMID: 34657434 DOI: 10.1021/acs.inorgchem.1c02599] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A scalable synthesis of the novel and highly reactive [Tc(OH2)(CO)3(PPh3)2]+ cation is described. The ligand-exchange chemistry of this compound with neutral ligands coordinating through C, N, O, S, Se, and Te has been explored systematically. The complexes either retain the original mer-trans tricarbonyl core under exclusive exchange of the aqua ligand or form dicarbonyl complexes by thermal decarbonylation. Ligand exchange reactions starting from [Tc(OH2)(CO)3(PPh3)2]+ proceed under mild conditions and are generally almost quantitative. Some of the formed complexes are remarkably stable and inert, while others provide products with one labile ligand for further reactions. The derived complexes of the type [Tc(L)(CO)3(PPh3)2]+ and [Tc(L)2(CO)2(PPh3)2]+ represent an interesting opportunity for the development of 99mTc complexes with potential use in radiopharmacy. The ready displacement of the aqua ligand highlights the synthetic value of [Tc(OH2)(CO)3(PPh3)2]+ as a reactive entry point for further studies in the little explored field of the organometallic chemistry of technetium.
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Affiliation(s)
- Maximilian Roca Jungfer
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34/36, D-14195 Berlin, Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34/36, D-14195 Berlin, Germany
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9
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Nagata K, Otsuji N, Akagi S, Fujii S, Kitamura N, Yoshimura T. Synthesis, Structures, and Photoluminescent Properties of Tricyanidonitridorhenium(V) Complexes with Bipyridine-Type Ligands. Inorg Chem 2020; 59:5497-5508. [PMID: 32271014 DOI: 10.1021/acs.inorgchem.0c00125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Tricyanidonitridorhenium(V) complexes with 2,2'-bipyridine (bpy) derivatives in which the 4 and 4' positions were substituted by X, [ReN(CN)3(X2bpy)]- (X = NMe2, NH2, OMe, Me, Cl, and Br), were newly synthesized and characterized. The structures of the new complexes were determined by single-crystal X-ray analysis. UV-vis spectra of the complexes in dimethyl sulfoxide (DMSO) showed that the peak maximum wavelengths of rhenium-to-π* bpy-type-ligand charge transfer were in the range of 474-542 nm. Cyclic voltammograms in n-(C4H9)4NPF6-DMSO showed one-electron oxidation and reduction waves corresponding to the Re(VI/V) and X2bpy0/- processes, respectively. The new complexes and [ReN(CN)3bpy]- showed photoluminescence in the crystalline phase at 295 and 80 K and in DMSO at 295 K. The origin of the emission in DMSO was attributed to the triplet nature of the rhenium-to-π* bpy-type-ligand charge-transfer transition. Density functional theory calculations showed that the highest occupied and lowest unoccupied molecular orbitals were primarily localized on the dxy orbital of the rhenium and π* orbitals of the bpy-type ligand, respectively.
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Affiliation(s)
- Kojiro Nagata
- Radioisotope Research Center, Institute for Radiation Sciences, Osaka University, Suita 565-0871, Japan
| | - Naoko Otsuji
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
| | - Soichiro Akagi
- Department of Chemical Sciences and Engineering, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0810, Japan
| | - Sho Fujii
- Department of Chemical Sciences and Engineering, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0810, Japan
| | - Noboru Kitamura
- Department of Chemical Sciences and Engineering, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0810, Japan
| | - Takashi Yoshimura
- Radioisotope Research Center, Institute for Radiation Sciences, Osaka University, Suita 565-0871, Japan.,Project Research Center for Fundamental Sciences, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan
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Abstract
The knowledge on element 43 (Tc) of the periodic table, built over the years through the contributions given by the close relationship between chemistry and nuclear medicine, allowed the development of new and increasingly effective radiopharmaceuticals useful both as perfusion and target specific imaging agents for SPECT (single photon emission tomography). Among the manifold Tc-compounds, Tc(V) nitrido complexes played a relevant role in the search for new technetium-99m radiopharmaceuticals, providing efficient labeling procedures that can be conveniently exploited for the design and synthesis of agents, also incorporating small organic molecules or peptides having defined structural features. With this work, we present an overview of four decades of research on the chemistry and on the nuclear medicine applications of Tc(V) nitrido complexes.
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Zhou X, Malakar S, Zhou T, Murugesan S, Huang C, Emge TJ, Krogh-Jespersen K, Goldman AS. Catalytic Alkane Transfer Dehydrogenation by PSP-Pincer-Ligated Ruthenium. Deactivation of an Extremely Reactive Fragment by Formation of Allyl Hydride Complexes. ACS Catal 2019. [DOI: 10.1021/acscatal.8b05172] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Xiaoguang Zhou
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Santanu Malakar
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Tian Zhou
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Sathiyamoorthy Murugesan
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Carlos Huang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Thomas J. Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Karsten Krogh-Jespersen
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Alan S. Goldman
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
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12
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Wei D, Sadek O, Dorcet V, Roisnel T, Darcel C, Gras E, Clot E, Sortais JB. Selective mono N-methylation of anilines with methanol catalyzed by rhenium complexes: An experimental and theoretical study. J Catal 2018. [DOI: 10.1016/j.jcat.2018.08.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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13
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Li H, Wei D, Bruneau-Voisine A, Ducamp M, Henrion M, Roisnel T, Dorcet V, Darcel C, Carpentier JF, Soulé JF, Sortais JB. Rhenium and Manganese Complexes Bearing Amino-Bis(phosphinite) Ligands: Synthesis, Characterization, and Catalytic Activity in Hydrogenation of Ketones. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00020] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Haoran Li
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | - Duo Wei
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | | | - Maxime Ducamp
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | - Mickaël Henrion
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | - Thierry Roisnel
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | - Vincent Dorcet
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | | | | | | | - Jean-Baptiste Sortais
- Université de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
- LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse, France
- Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France
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15
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Reinholdt A, Hill AF, Bendix J. Synthons for carbide complex chemistry. Chem Commun (Camb) 2018; 54:5708-5711. [DOI: 10.1039/c8cc03596b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Harnessing lability, the miniaturized ligand sphere in a [RuC–Pt] complex establishes a straightforward building-block approach to carbide complexes.
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Affiliation(s)
- Anders Reinholdt
- Department of Chemistry
- University of Copenhagen
- 2100 Copenhagen
- Denmark
- Research School of Chemistry
| | - Anthony F. Hill
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Jesper Bendix
- Department of Chemistry
- University of Copenhagen
- 2100 Copenhagen
- Denmark
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16
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Papagiannopoulou D. Technetium-99m radiochemistry for pharmaceutical applications. J Labelled Comp Radiopharm 2017; 60:502-520. [PMID: 28618064 DOI: 10.1002/jlcr.3531] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 06/08/2017] [Accepted: 06/08/2017] [Indexed: 12/14/2022]
Abstract
Technetium-99m (99m Tc) is a widely used radionuclide, and the development of 99m Tc imaging agents continues to be in demand. This overview discusses basic principles of 99m Tc radiopharmaceutical preparation and design and focuses on the 99m Tc radiochemistry relevant to its pharmaceutical applications. The 99m Tc complexes are described based on the most typical examples in each category, keeping up with the state-of-the-art in the field. In addition, the main current strategies to develop targeted 99m Tc radiopharmaceuticals are summarized.
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Affiliation(s)
- Dionysia Papagiannopoulou
- Department of Pharmaceutical Chemistry, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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17
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Salvarese N, Refosco F, Seraglia R, Roverso M, Dolmella A, Bolzati C. Synthesis and characterization of rhenium(iii) complexes with (Ph 2PCH 2CH 2) 2NR diphosphinoamine ligands. Dalton Trans 2017; 46:9180-9191. [PMID: 28675225 DOI: 10.1039/c7dt01032j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterization of a new series of neutral, six-coordinated compounds [ReIIIX3(PNPR)], where X is Cl or Br and PNPR is a diphosphinoamine having the general formula (Ph2PCH2CH2)2NR (R = H, CH3, CH2CH3, CH2CH2CH3, CH2CH2CH2CH3 and CH2CH2OCH3) are reported. Stable [ReIIIX3(PNPR)] complexes were synthesized, in variable yields, starting from precursors where the metal was in different oxidation states (iii and v), by ligand-exchange and/or redox-substitution reactions. The compounds were characterized by elemental analysis, proton NMR spectroscopy, cyclic voltammetry, UV/vis spectroscopy, positive-ion electrospray ionization mass spectrometry (ESI(+)-MS) and X-ray diffraction analysis. Although the formulation of the complexes allows either meridional or facial isomers, the latter arrangement was prevalent both in the solid and solution states. Only [ReCl3(PNPH)] showed a meridional configuration both in solution and in the crystalline state. [ReBr3(PNPme)] prefers the meridional configuration in the crystalline state and the facial one in solution. While ESI(+)-MS and voltammetric data seem to indicate some dependency from the nature of the alkyl substituent at the nitrogen, the available structural data of the complexes show only slight differences both for angles and bond lengths upon change of the alkyl chain tethered to the nitrogen.
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Wei D, Roisnel T, Darcel C, Clot E, Sortais JB. Hydrogenation of Carbonyl Derivatives with a Well-Defined Rhenium Precatalyst. ChemCatChem 2016. [DOI: 10.1002/cctc.201601141] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Duo Wei
- Institut des Sciences Chimiques de Rennes; UMR 6226, CNRS Université de Rennes 1; 263 avenue du Général Leclerc 35046 Rennes Cedex France
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes; UMR 6226, CNRS Université de Rennes 1; 263 avenue du Général Leclerc 35046 Rennes Cedex France
| | - Christophe Darcel
- Institut des Sciences Chimiques de Rennes; UMR 6226, CNRS Université de Rennes 1; 263 avenue du Général Leclerc 35046 Rennes Cedex France
| | - Eric Clot
- Institut Charles Gerhardt; UMR 5253 CNRS-UM-ENSCM; Université de Montpellier; Place Eugène Bataillon, cc 1501 34095 Montpellier Cedex 5 France
| | - Jean-Baptiste Sortais
- Institut des Sciences Chimiques de Rennes; UMR 6226, CNRS Université de Rennes 1; 263 avenue du Général Leclerc 35046 Rennes Cedex France
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Bhat SA, Mague JT, Balakrishna MS. Transition metal chemistry of large-bite bisphosphines, N,N-bis(diphenylphosphinobenzyl)-N-phenylamine and bis(2-diphenylphosphinobenzyl)ether. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.02.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Morsing TJ, Reinholdt A, Sauer SPA, Bendix J. Ligand Sphere Conversions in Terminal Carbide Complexes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00803] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thorbjørn J. Morsing
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 København Ø, Denmark
| | - Anders Reinholdt
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 København Ø, Denmark
| | - Stephan P. A. Sauer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 København Ø, Denmark
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 København Ø, Denmark
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Korstanje TJ, Lutz M, Jastrzebski JTBH, Klein Gebbink RJM. Synthesis and Characterization of Rhenium(V) Oxo Complexes Bearing PNP-Pincer Ligands. Organometallics 2014. [DOI: 10.1021/om401228u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ties J. Korstanje
- Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Martin Lutz
- Crystal and Structural
Chemistry, Bijvoet Center
for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Johann T. B. H. Jastrzebski
- Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Robertus J. M. Klein Gebbink
- Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
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Salvarese N, Morellato N, Venzo A, Refosco F, Dolmella A, Bolzati C. Synthesis and Characterization of [MIII(PS)2(L)] Mixed-Ligand Compounds (M = Re, 99Tc; PS = Phosphinothiolate; L = Dithiocarbamate) as Potential Models for the Development of New Agents for SPECT Imaging and Radiotherapy. Inorg Chem 2013; 52:6365-77. [DOI: 10.1021/ic400094s] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- N. Salvarese
- Dipartimento di Scienze del
Farmaco, Università di Padova, Via
Marzolo 5, 35131 Padova, Italy
| | - N. Morellato
- Dipartimento di Scienze del
Farmaco, Università di Padova, Via
Marzolo 5, 35131 Padova, Italy
| | - A. Venzo
- ISTM-CNR, Via Marzolo 1, 35131 Padova,
Italy
| | - F. Refosco
- ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - A. Dolmella
- Dipartimento di Scienze del
Farmaco, Università di Padova, Via
Marzolo 5, 35131 Padova, Italy
| | - C. Bolzati
- ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
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23
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Berry DJ, Torres Martin de Rosales R, Charoenphun P, Blower PJ. Dithiocarbamate complexes as radiopharmaceuticals for medical imaging. Mini Rev Med Chem 2013; 12:1174-83. [PMID: 22931590 DOI: 10.2174/138955712802762112] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 03/29/2012] [Accepted: 04/02/2012] [Indexed: 11/22/2022]
Abstract
Over the past 30 years dithiocarbamate ligands have found application in radiopharmaceutical metal-ligand complexes to image a range of disease states. The vast majority of research and applications, and the widest range of complex structures, have involved radionuclides of technetium and rhenium. Considering the extent of coordination chemistry of dithiocarbamate ligands described elsewhere in this issue, the extent of radiopharmaceutical application with metallic radionuclides is surprisingly narrow. Here we summarise the types of radiopharmaceutical complexes studied and the uses, and potential uses, to which they have been put in nuclear medicine.
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Affiliation(s)
- David J Berry
- King's College London, Division of Imaging Sciences and Biomedical Engineering, 4th Floor Lambeth Wing, St Thomas Hospital, London SE1 7EH, UK
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Zeng H, Zhao L, Hu S, Liu Y, Yu H, Chen N, Zhang H. Synthesis, characterization and biodistribution of new fatty acids conjugates bearing N,N,N-donors incorporated [99mTc/Re(CO)3]+. Dalton Trans 2013; 42:2894-901. [DOI: 10.1039/c2dt32492j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Peruzzo V, Pretzsch C, Tisato F, Porchia M, Refosco F, Marzano C, Gandin V, Schiller E, Walther M, Pietzsch HJ. Synthesis and characterization of novel tetrahedral copper(I) complexes comprising tridentate PNP-aminodiphosphines and tetradentate PN(X)P-substituted aminodiphosphines (X=O, S). Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.01.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Tisato F, Bolzati C, Refosco F, Porchia M, Seraglia R, Carta D, Pasqualini R. Insights into the failure of the potential, neutral myocardial imaging agent TcN-NOET: physicochemical identification of by-products and degradation species. Nucl Med Biol 2012; 39:335-46. [DOI: 10.1016/j.nucmedbio.2011.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 09/14/2011] [Accepted: 09/17/2011] [Indexed: 10/14/2022]
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Boschi A, Cazzola E, Uccelli L, Pasquali M, Ferretti V, Bertolasi V, Duatti A. Rhenium(V) and Technetium(V) Nitrido Complexes with Mixed Tridentate π-Donor and Monodentate π-Acceptor Ligands. Inorg Chem 2012; 51:3130-7. [DOI: 10.1021/ic202605z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Alessandra Boschi
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Emiliano Cazzola
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Licia Uccelli
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Micol Pasquali
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Valeria Ferretti
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Valerio Bertolasi
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
| | - Adriano Duatti
- Laboratory
of Nuclear Medicine, Department of Radiological Sciences and ‡Department of
Chemistry and Centre for Structural Diffractometry,University of Ferrara, 44121 Ferrara, Italy
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Synthesis, characterization and biological evaluation of [188Re(N)(cys∼)(PNP)]+/0 mixed-ligand complexes as prototypes for the development of 188Re(N)-based target-specific radiopharmaceuticals. Nucl Med Biol 2011; 38:399-415. [DOI: 10.1016/j.nucmedbio.2010.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 09/24/2010] [Accepted: 09/29/2010] [Indexed: 11/21/2022]
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Mathur A, Mallia MB, Sarma HD, Banerjee S, Venkatesh M. Evaluation of new positively charged 11- and 12-carbon 99mTc-labeled fatty acid derivatives for myocardial imaging. J Labelled Comp Radiopharm 2010. [DOI: 10.1002/jlcr.1784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Cazzola E, Benini E, Pasquali M, Mirtschink P, Walther M, Pietzsch HJ, Uccelli L, Boschi A, Bolzati C, Duatti A. Labeling of Fatty Acid Ligands with the Strong Electrophilic Metal Fragment [99mTc(N)(PNP)]2+ (PNP = Diphosphane Ligand). Bioconjug Chem 2008; 19:450-60. [DOI: 10.1021/bc7002378] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emiliano Cazzola
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Elisa Benini
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Micol Pasquali
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Peter Mirtschink
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Martin Walther
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Hans-Jurgen Pietzsch
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Licia Uccelli
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Alessandra Boschi
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Cristina Bolzati
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
| | - Adriano Duatti
- Laboratory of Nuclear Medicine, Department of Radiological Sciences, University of Ferrara, 44100 Ferrara, Italy, Institute of Physiology, Medical Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany, Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, PF 510119, 01314 Dresden, Germany, and ICIS-CNR, Corso Stati Uniti, 4, 35127 Padova, Italy
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Tisato F, Porchia M, Bolzati C, Refosco F, Vittadini A. The preparation of substitution-inert 99Tc metal-fragments: Promising candidates for the design of new 99mTc radiopharmaceuticals. Coord Chem Rev 2006. [DOI: 10.1016/j.ccr.2006.01.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Porchia M, Tisato F, Refosco F, Bolzati C, Cavazza-Ceccato M, Bandoli G, Dolmella A. New Approach to the Chemistry of Technetium(V) and Rhenium(V) Phenylimido Complexes: Novel [M(NPh)PNP]3+ Metal Fragments (M = Tc, Re; PNP = Aminodiphosphine) Suitable for the Synthesis of Stable Mixed-Ligand Compounds. Inorg Chem 2005; 44:4766-76. [PMID: 15962985 DOI: 10.1021/ic048486y] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ligand-exchange reactions of the aminodiphosphine ligand bis[(2-diphenylphosphino)ethyl]amine hydrochloride (PNHP x HCl) with labile M(NPh)Cl3(PPh3)2 precursors (M = Re, Tc) in the presence of triethylamine yield monocationic phenylimido mer,cis-[M(NPh)Cl2(PNHP)]Cl (M = Re, 1; Tc, 2) intermediate complexes. X-ray analyses show that in both compounds the aminodiphosphine acts as a tridentate ligand dictating a mer,cis arrangement. Two chloride ligands, respectively in an equatorial and in the axial position trans to the linear M-NPh moiety, fill the remaining positions in a distorted-octahedral geometry. The chloride trans to the metal-imido core is labile, and is replaced by an alcoholate group, without affecting the original geometry, as established in mer,cis-[Re(NPh)(OEt)Cl(PNHP)]Cl 4. Otherwise, ligand-exchange reactions involving the aminodiphosphine bis[(2-diphenylphosphino)ethyl]methylamine (PNMeP), in which the central secondary amine has been replaced by a tertiary amine function, or its hydrochloride salt (PNMeP x HCl) give rise to three different species, depending on the experimental conditions: fac,cis-[Re(NPh)Cl2(PNMeP)]Cl 3a, cis,fac-Re(NPh)Cl3(PNMeP) x HCl 3b, and mer,trans-[Re(NPh)Cl2(PNMeP)]Cl 3c, which are characterized in solution by multinuclear NMR studies. The monodentate groups incorporated in these intermediate compounds, either halides and/or ethoxide, undergo substitution reactions with bidentate donor ligands such as catechol, ethylene glycol, and 1,2-aminophenol to afford stable mixed ligand complexes of the type [M(NPh)(O,O-cat)(PNP)]Cl [PNP = PNHP M = Re 5, Tc 6; PNP = PNMeP M = Re 7], [Re(NPh)(O,O-gly)(PNP)]Cl [PNP = PNHP 8, PNMeP 9] and [Re(NPh)(O,N-ap)(PNMeP)]Cl 10. X-ray diffraction analyses of the representative compounds 5 and 8 reveal that the aminodiphosphine switches from the meridional to the facial coordination mode placing the heteroatom of the diphosphine trans to the phenylimido unit and the bidentate ligand in the equatorial plane. Solution-state NMR studies suggest an analogous geometry for 6, 7, 9, and 10. Comparison with similar mixed ligand complexes including the terminal nitrido group is discussed.
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