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Novikov AP, Volkov MA. New O- and N-N-Bridging Complexes of Tc(V), the Role of the Nitrogen Atom Position in Aromatic Rings: Reaction Mechanism, Spectroscopy, DTA, XRD and Hirshfeld Surface Analysis. Int J Mol Sci 2022; 23:ijms232214034. [PMID: 36430512 PMCID: PMC9696901 DOI: 10.3390/ijms232214034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/10/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022] Open
Abstract
In this work, O- and N-N-bridging complexes of technetium (V), previously known only for rhenium, were obtained for the first time. Tc(V) complexes with pyridazine (pyd), 1,2,4-triazole (trz), 3,5-dimethylpyrazole (dmpz) and pyrimidine (pyr) were obtained. In three complexes [{TcOCl2}2(μ-O)(μ-pyd)2], [{TcOCl2}2(μ-O)(μ-trz)2]·Htrz·Cl and [{TcO(dmpz)4}(μ-O)(TcOCl4)] two technetium atoms are linked by a Tc-O-Tc bond, and in the first two, Tc atoms are additionally linked by a Tc-N-N-Tc bond through the nitrogen atoms of the aromatic rings. We determined the role of nitrogen atom position in the aromatic ring and the presence of substituents on the formation of such complexes. For the first time, a reaction mechanism for the formation of such complexes was proposed. This article details the crystal structures of four new compounds. The work describes in detail the coordination of Tc atoms in the obtained structures and the regularities of the formation of crystal packings. The spectroscopic properties of the obtained compounds and their mother solutions were studied. The decomposition temperatures of the described complexes were determined. An assumption was made about the oligomerization of three-bridged complexes based on the results of mass spectrometry. Through the analysis of non-valent interactions in the structures, π-stacking, halogen-π and CH-π interactions were found. An analysis of the Hirshfeld surface for [{TcOCl2}2(μ-O)(μ-pyd)2], [{TcOCl2}2(μ-O)(μ-trz)2] and their rhenium analogues showed that the main contribution to the crystalline packing is made by interactions of the type Hal···H/H···Hal (45.4-48.9%), H···H (10.2-15.8%), and O···H/H···O (9.4-16.5%).
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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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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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Bendix J, Birk T, Weyhermüller T. Molecular and electronic structure of chromium(v) nitrido complexes with azide and isothiocyanate ligands. Dalton Trans 2005:2737-41. [PMID: 16075114 DOI: 10.1039/b505138j] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first use of [Cr(N)Cl4]2- as a starting material in chromium(v) nitrido chemistry is demonstrated in simple, high yield, metathesis reactions with the pseudohalogens SCN- and N3- yielding five-coordinate, labile complexes: [Cr(N)(NCS)4]2- and [Cr(N)(N3)4]2-, which have been crystallized and characterized by single-crystal X-ray diffraction. Reaction of [Cr(N)(NCS)4]2- with 1,10-phenanthroline furnishes six-coordinate [Cr(N)(NCS)3(phen)]- wherein phenanthroline coordinates to the position trans to the nitrido ligand. The trans influence of the nitrido ligand leads to a bond length difference of 0.223 A between the axial and equatorial ligators from the phenanthroline ligand. The absorption band with lowest energy in these pseudo-linear complexes is assigned as the electric dipole forbidden transition d(xy) --> d(x-y) based on intensities and its variation with the nature of the equatorial ligators. This absorption provides the spectrochemical series for the equatorial ligands, which is found to be numerically almost identical to that determined for chromium(III). DFT calculations reproduce the observed structures and corroborate the ligand field picture of the electronic structure of these complexes.
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Affiliation(s)
- Jesper Bendix
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Denmark. bendix@kikudk
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Schwochau K, Linse KH, Pleger P, Pleger U, Kremer C, de Graaf AA. Preparation, characterization and organ distribution of the oxochloro-BIS-(1,10-phenanthroline)technetium (V) cation. J Labelled Comp Radiopharm 1998. [DOI: 10.1002/(sici)1099-1344(199611)38:11<1031::aid-jlcr919>3.0.co;2-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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New bis(dithiocarboxylato)nitridotechnetium-99m radiopharmaceuticals for leucocyte labelling: In vitro and In vivo studies. Nucl Med Biol 1997. [DOI: 10.1016/s0969-8051(97)80012-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Lorenz B, Kr�nke P, Schmidt K, Krimse R, H�bener R, Abram U. Synthese, EPR und R�ntgenkristallstrukturanalyse von mer-Trichloro(2,2?-bipyridin)nitridotechnetium(VI), einem neuen Nitridokomplex des Technetium(VI). Z Anorg Allg Chem 1994. [DOI: 10.1002/zaac.19946200527] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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