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Volkov MA, Abkhalimov EV, Novikov AP, Nevolin IM, Grigoriev MS. Synthesis of Technetium Carboxylates: Wheel-Like Octanuclear Clusters (Tc 8(μ-O) 8(RCOO) 16, Where R = CF 3, C 6H 5)─Potential Nanobuilding Units for Tc-MOFs. Inorg Chem 2024; 63:13613-13623. [PMID: 38982863 DOI: 10.1021/acs.inorgchem.4c01818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Herein, we studied the behavior of TcO4- in trifluoroacetic anhydride (TFAA) under visible light irradiation in situ by UV-vis spectroscopy. One carboxylate of Tc(VII) C2F3O5Tc (1) and two wheel-like carboxylate clusters of Tc(IV) Tc8(μ-O)8(CF3COO)16 (2, 3) and Tc8(μ-O)8(C6H5COO)16 (4) were synthesized and analyzed using pXRD, TGA, UV-vis spectroscopy, and SCXRD techniques. According to SCXRD, it was found that Tc(IV) trifluoroacetate exists in two crystalline modifications. By UV-vis spectroscopy and DFT calculations, it was shown that the primary compound in the reaction system is trifluoroacetate Tc(VII). A technetium trifluoroacetate(VII) and Tc intermediates of unidentified nature both show photosensitivity. The influence of intermolecular noncovalent interactions on the volatility of trifluoroacetate and benzoate Tc(IV) is shown. The main regularities of chemical transformations of technetium in nonaqueous solutions of carboxylates have been revealed. The obtained data on the kinetics of the process suggest that technetium in trifluoroacetic anhydride can simultaneously exist in the form of Tc(VII), Tc(VI), Tc(V), and Tc(IV). Under laser ionization or prolonged heating, the formation of the Tc(II,III)-cluster is observed.
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Affiliation(s)
- Mikhail A Volkov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31-4, 119071 Moscow, Russia
| | - Evgeny V Abkhalimov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31-4, 119071 Moscow, Russia
| | - Anton P Novikov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31-4, 119071 Moscow, Russia
| | - Iurii M Nevolin
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31-4, 119071 Moscow, Russia
| | - Mikhail S Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky prosp. 31-4, 119071 Moscow, Russia
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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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Novel Synthesis Methods of New Imidazole-Containing Coordination Compounds Tc(IV, V, VII)-Reaction Mechanism, Xrd and Hirshfeld Surface Analysis. Int J Mol Sci 2022; 23:ijms23169461. [PMID: 36012725 PMCID: PMC9408894 DOI: 10.3390/ijms23169461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 08/19/2022] [Accepted: 08/20/2022] [Indexed: 11/17/2022] Open
Abstract
In this work, we have proposed two new methods for the synthesis of [TcO2L4]+ (where L = imidazole (Im), methylimidazole (MeIm)) complexes using thiourea (Tu) and Sn(II) as the reducing agents. The main and by-products of the reactions were determined, and possible reaction mechanisms were proposed. We have shown that the reduction of Tc(VII) with thiourea is accompanied by the formation of the Tc(III) intermediate and further oxidation to Tc(V). The reaction conditions’ changing can lead to the formation of Tc(VII) and Tc(IV) salts. Seven new crystal structures are described in this work: Tc(V) complexes, salts with Tc(VII) and Tc(IV) anions. For the halide salts of Tu the cell parameters were determined. In all of the obtained compounds, except for [TcO2(MeIm)4]TcO4, there are π–stacking interactions between the aromatic rings. An increase in the anion size lead to weakening of the intermolecular interactions. The halogen bonds and anion-π interactions were also found in the hexahalide-containing compounds. The Hirshfeld surface analysis showed that the main contribution to the crystal packing is created by the van der Waals interactions of the H···H type (42.5–55.1%), H···C/C···H (17.7–21.3%) and hydrogen bonds, which contribute 15.7–25.3% in total.
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Sergienko VS, Churakov AV. Specific features of technetium mononuclear octahedral oxo complexes: A review. CRYSTALLOGR REP+ 2013. [DOI: 10.1134/s1063774513010112] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Chatterjee S, Del Negro AS, Wang Z, Edwards MK, Skomurski FN, Hightower SE, Krause JA, Twamley B, Sullivan BP, Reber C, Heineman WR, Seliskar CJ, Bryan SA. Electronic and Molecular Structures of trans-Dioxotechnetium(V) Polypyridyl Complexes in the Solid State. Inorg Chem 2011; 50:5815-23. [DOI: 10.1021/ic200747v] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sayandev Chatterjee
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Andrew S. Del Negro
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Zheming Wang
- Fundamental and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Matthew K. Edwards
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Frances N. Skomurski
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Sean E. Hightower
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Brendan Twamley
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - B. Patrick Sullivan
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Christian Reber
- Département de Chimie, Université de Montréal, Montréal QC H3C 3J7, Canada
| | - William R. Heineman
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Carl J. Seliskar
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Samuel A. Bryan
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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Chatterjee S, Del Negro AS, Edwards MK, Twamley B, Krause JA, Bryan SA. trans-K(3)[TcO(2)(CN)(4)]. Acta Crystallogr Sect E Struct Rep Online 2010; 66:i61-i62. [PMID: 21588082 PMCID: PMC3007308 DOI: 10.1107/s1600536810028205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Accepted: 07/14/2010] [Indexed: 05/30/2023]
Abstract
The structure of the title compound, tripotassium trans-tetra-cyanidodioxidotechnetate(V), is isotypic with its Re analogue. The [TcO(2)(CN)(4)](3-)trans-tetra-cyanido-dioxido-technetate anion has a slightly distorted octa-hedral configuration. The Tc atom is located on a center of inversion and is bound to two O atoms in axial and to four cyanide ligands in equatorial positions. The Tc-O distance is consistent with a double-bond character. The two potassium cations, one located on a center of inversion and one in a general position, reside in octa-hedral or tetra-hedral environments, respectively. K⋯O and K⋯N inter-actions occur in the 2.7877 (19)-2.8598 (15) Å range.
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Affiliation(s)
- Sayandev Chatterjee
- Radiochemical Processing Laboratory, Pacific Northwest National Laboratory, Richland, WA 99357, USA
| | - Andrew S. Del Negro
- Radiochemical Processing Laboratory, Pacific Northwest National Laboratory, Richland, WA 99357, USA
| | - Matthew K. Edwards
- Radiochemical Processing Laboratory, Pacific Northwest National Laboratory, Richland, WA 99357, USA
| | - Brendan Twamley
- Department of Chemistry, University of Idaho, Moscow, ID 83844, USA
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
| | - Samuel A. Bryan
- Radiochemical Processing Laboratory, Pacific Northwest National Laboratory, Richland, WA 99357, USA
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Rattat D, Verbruggen A, Berke H. Rhenium-Dicarbonyl-Nitrosyl-Komplexe mit Imidazol. Z Anorg Allg Chem 2006. [DOI: 10.1002/zaac.200500468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Hansen L, Lampeka YD, Gavrish SP, Xu X, Taylor AT, Marzilli LG. Re(V) complexes with an open-chain quadridentate ligand containing two amine and two amido donors. Synthesis, characterization, and solution equilibria of Re2O3(dioxo-tetH4)2 and [ReO(H2O)(dioxo-tetH4)]Cl (dioxo-tetH6 = 1,4,8,11-tetraazaundecane-5,7-dione). Inorg Chem 2000; 39:5859-66. [PMID: 11151390 DOI: 10.1021/ic000173p] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We are interested in identifying mononuclear cationic [M(V)=O]3+ (M = Tc, Re) complexes for radiopharmaceutical applications. The open-chain ligand, 1,4,8,11-tetraazaundecane-5,7-dione-(dioxo-tetH6) with two amine and two amide donors, was selected for investigation since the literature led us to expect that a five-coordinate [Re(V)=O(dioxo-tetH4)]+ cation would dominate. Instead, the neutral mu-oxo bridged dinuclear complex, Re2O3(dioxo-tetH4)2 (1), and a salt of the six-coordinate mononuclear cation, [ReO(H2O)(dioxo-tetH4)]+ (2), were isolated; the structure of each was determined by X-ray crystallography. The cation (2) is unusual because it has a trans-oxo/aqua core. Such aqua compounds are rarely isolated, and the Re-OH2 distance is relatively short (2.185 A). The cation has two pKa values, 4.1 and 8.7, determined with visible spectroscopy. Since the Re-OH2 bond is short, the coordinated water is likely to be acidic. Thus the two pKa's are assigned to the stepwise deprotonation of the water ligand to give a trans-oxo/hydroxo neutral form and a trans-dioxo anion. Although 1 was the first product isolated following ligand exchange of ReOCl3(Me2S)(OPPh3) with dioxo-tetH6 under neutral conditions, it probably formed from the hydroxo mononuclear complex. Under concentrated conditions (approximately 300 mM) the dinuclear complex deposited from solution, but the 1H NMR spectra of 2 (approximately 20 mM) were consistent with the presence of only monomeric forms in D2O, pH 3-12. 1H NMR experiments demonstrated that in DMSO-d6 2 converts to 1 upon addition of base, consistent with the proposal that two units of the hydroxo monomer condense to give the dinuclear form. In addition, all spectra of pure 1 dissolved in DMSO-d6 included extra low intensity signals that were characteristic of the monomer. Thus, although 1 is favored over the neutral monomer in DMSO-d6, the two complexes exist as a mixture of equilibrating forms. Our results do not support the previous findings for the Re(V) complex with a macrocyclic diamine-diamide ligand related to dioxo-tetH6. The data indicate that the ability of an amido group to donate electron density to a Re(V) center is moderately greater than the donating ability of a neutral amine group.
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Affiliation(s)
- L Hansen
- Department of Radiology and Chemistry, Emory University, Atlanta, Georgia 30322, USA
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Reddy KR, Domingos Â, Paulo A, Santos I. Rhenium(V) Dioxo Complexes with Dihydrobis(pyrazolyl)borates: Synthesis and Reactivity toward Electrophilic Substrates. Inorg Chem 1999. [DOI: 10.1021/ic990229j] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Rajender Reddy
- Departamento de Química e Radioisótopos, ITN, 2686 Sacavém Codex, Portugal
| | - Ângela Domingos
- Departamento de Química e Radioisótopos, ITN, 2686 Sacavém Codex, Portugal
| | - António Paulo
- Departamento de Química e Radioisótopos, ITN, 2686 Sacavém Codex, Portugal
| | - Isabel Santos
- Departamento de Química e Radioisótopos, ITN, 2686 Sacavém Codex, Portugal
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11
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Paulo A, Reddy KR, Domingos  Â, Santos I. Neutral trans-Dioxorhenium(V) Complexes with the Anionic Tetrakis(pyrazolyl)borate Ligand. Inorg Chem 1998; 37:6807-6813. [PMID: 11670816 DOI: 10.1021/ic980422y] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reduction of [ReO(3){eta(3)-B(pz)(4)}] (1) with PPh(3) in the presence of mono- or bidentate sigma-donor ligands (pyridines, imidazoles, or diphosphines) is a very convenient method for the synthesis of the neutral dioxorhenium(V) complexes: trans-[ReO(2){eta(2)-B(pz)(4)}(L)(2)] (L = py (3), 4-Mepy (4), 4-NMe(2)py (5), 1-MeImz (6)) and trans-[ReO(2){eta(2)-B(pz)(4)}(P&arcraise;P)] (P&arcraise;P = dmpe (7), dppe (8)). In the presence of pyridine or dimethylphosphinoethane, the analogous [ReO(3){eta(3)-HB(pz)(3)}] is also reduced by PPh(3) to trans-[ReO(2){eta(2)-HB(pz)(3)}(py)(2)] (9) and trans-[ReO(2){eta(2)-HB(pz)(3)}(dmpe)] (10), respectively. In contrast, the reaction of [ReO(2)(py)(4)]Cl with K[B(pz)(4)] leads to a mixture of species from which were identified the neutral mono-oxo complexes [ReO(eta(2)-N,O)(&mgr;-O)B(pz)(3)}(pz)(pzH)(2)] (11) and [ReO{(eta(2)-N,O)(&mgr;-O)B(pz)(3)}Cl(py)(2)] (12). Complexes 3-12 were characterized by different techniques, namely, IR, (1)H/(31)P{(1)H} NMR spectroscopies and X-ray crystallographic analysis (5, 10, and 11). Compound 5 crystallizes from dichloromethane/n-hexane as orange crystals containing 3 molecules of solvated CH(2)Cl(2) (crystal data: triclinic space group P&onemacr;, with cell parameters a = 10.907(2) Å, b = 11.113(1) Å, c = 16.922(2) Å, alpha = 97.91(1) degrees, beta = 102.37(1) degrees, gamma = 94.21(1) degrees, V = 1973(1) Å(3), Z = 2). Compound 10 crystallizes from dichloromethane/n-hexane as yellowish crystals containing one molecule of pzH (crystal data: orthorhombic space group Pnma, with cell parameters a = 18.422(2) Å, b = 11.850(1) Å, c = 11.434(1) Å, alpha = beta = gamma = 90 degrees, V = 2496.1(4) Å(3), Z = 4). Compound 11 crystallizes from dichloromethane/n-hexane in the monoclinic space group P2(1)/n, with cell parameters a = 10.890(1) Å, b = 15.162(1) Å, c = 14.137(2) Å, beta = 102.07(1) degrees, V = 2282.6(4) Å(3), Z = 4.
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Affiliation(s)
- António Paulo
- Departamento de Química e Radioisótopos, ITN, 2686 Sacavém Codex, Portugal
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Bendix J, Bøgevig A. Synthesis and Characterization of a Stable trans-Dioxo Tungsten(IV) Complex and Series of Mono-Oxo Molybdenum(IV) and Tungsten(IV) Complexes. Structural and Electronic Effects of pi-Bonding in trans-[M(O)(X)(dppe)(2)](+/0) Systems. Inorg Chem 1998; 37:5992-6001. [PMID: 11670732 DOI: 10.1021/ic980342u] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
trans-[W(O)(F)(dppe)(2)](BF(4)) (dppe = Ph(2)PCH(2)CH(2)PPh(2), 1,2-bis(diphenylphosphino)ethane) (10) has been synthesized. From this, the neutral trans-[W(O)(2)(dppe)(2)].2CH(3)OH (11) was prepared by a hydrolysis and deprotonation reaction with Et(4)NOH in methanol/water. Together with the analogous molybdenum compound (2) this compound afforded by substitution under acid conditions salts of trans-[M(O)(X)(dppe)(2)](+) ions (M = Mo, W; X = OH, OCH(3), Cl, Br, I, NCS) and trans-[Mo(O)(N(3))(dppe)(2)](CF(3)SO(3)) (9). All the compounds have low-spin d(2) electronic configuration. The compounds were characterized by (31)P{(1)H} NMR, positive FAB-ionization mass spectrometry, UV-vis spectroscopy, and vibrational spectroscopy. X-ray crystallographic studies were carried out on compounds 10, 11, trans-[W(O)(OH)(dppe)(2)](ClO(4)) (12), and trans-[W(O)(NCS)(dppe)(2)](BPh(4)) (16). The electronic spectra of the mono-oxo species are consistent with the lowest energy transitions being of d(xy)() --> {d(zx)(), d(yz)()} character. No ligand-field transitions are observed for the dioxo tungsten complex. Identical pi-spectrochemical series were found for the two metals. The shielding of the phosphorus nuclei determined by (31)P{(1)H} NMR is significantly influenced by the nature of the axial ligands.
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Affiliation(s)
- Jesper Bendix
- Department of Inorganic Chemistry and Centre for Crystallographic Studies, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
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13
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Bendix J, Birkedal H, Bøgevig A. Synthesis of trans-[Mo(O)(F)(dppe)(2)](BF(4)), trans-[Mo(O)(OH)(dppe)(2)](ClO(4)), and trans-[Mo(O)(2)(dppe)(2)].2L (L = H(2)O, CH(3)OH, CH(3)CH(2)OH, CH(3)CHOHCH(3)). Crystal Structure of trans-[Mo(O)(2)(dppe)(2)].2CH(3)OH. Inorg Chem 1997; 36:2702-2703. [PMID: 11669899 DOI: 10.1021/ic9614071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jesper Bendix
- Department of Inorganic Chemistry and Centre for Crystallographic Studies, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
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Kremer C, Gancheff J, Kremer E, Mombrú AW, González O, Mariezcurrena R, Suescun L, Cubas ML, Ventura ON. Structural and conformational analysis of Tcv and Rev dioxo complexes. X-ray crystal structure of [TcO2(tn)2]·H2O. Polyhedron 1997. [DOI: 10.1016/s0277-5387(97)00056-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bélanger S, Beauchamp AL. Preparation and Protonation Studies of trans-Dioxorhenium(V) Complexes with Imidazoles. Inorg Chem 1996. [DOI: 10.1021/ic960451d] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suzanne Bélanger
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada H3C 3J7
| | - André L. Beauchamp
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada H3C 3J7
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Kremer C, Domínguez S, Pérez-Sánchez M, Mederos A, Kremer E. Comparative electrochemistry of technetium(V) and rhenium(V) dioxo complexes. J Radioanal Nucl Chem 1996. [DOI: 10.1007/bf02163572] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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18
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19
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Wei Y, Liu BL, Kung HF. Quantitative study of the structure-stability relationship of Tc complexes. INTERNATIONAL JOURNAL OF RADIATION APPLICATIONS AND INSTRUMENTATION. PART A, APPLIED RADIATION AND ISOTOPES 1990; 41:763-71. [PMID: 2172188 DOI: 10.1016/0883-2889(90)90025-c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
By studying structural parameters (van der Waals radius and bond length from x-ray crystallography) of more than 100 known Tc compounds and using the cone packing model, a stability indicator of the Tc compounds was derived. The indicator is based on the solid angle factor sum (SAS), which is calculated from van der Waals radii and bond lengths between all coordinating atoms and Tc. The average SAS value is 0.97 +/- 0.13. The SAS value reflects the limits of the packing of ligand around Tc. The quantitative calculation of the SAS is useful for predicting stability and designing new Tc radiopharmaceuticals.
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Affiliation(s)
- Y Wei
- Department of Chemistry, Beijing Normal University, People's Republic of China
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20
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O'Connell LA, Pearlstein RM, Davison A, Thornback JR, Kronauge JF, Jones AG. Technetium-99 NMR spectroscopy: chemical shift trends and long range coupling effects. Inorganica Chim Acta 1989. [DOI: 10.1016/s0020-1693(00)90112-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Abstract
Four amino acids--alanine, 2,3-diaminopropionic acid, cystine, and cystein--and also one diamine, ethylenediamine, were chelated with 99m-technetium (99mTc), and their renal excretion patterns were studied in rabbits in the presence and absence of two renal tubular transport inhibitors, probenecid and 2,4-dinitrophenol. From the depression of renal excretion for the first three amino acid chelates, in the presence of the inhibitors, a renal tubular excretory pathway of elimination was suggested for these compounds. The renal excretions of 99mTc-cystein and 99mTc-ethylenediamine however, remained undepressed under similar experimental conditions. An explanation of these observations was forwarded from the possible chemical structures of these chelates.
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Affiliation(s)
- M Chattopadhyay
- Indian Institute of Chemical Biology, Dept. of Nuclear Medicine, Calcutta
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Abram U, Abram S, Spies H, Kirmse R, Stach J, K�hler K. Zum Ligandenaustausch an TcNX4?-Komplexen (X = Cl, Br). Z Anorg Allg Chem 1987. [DOI: 10.1002/zaac.19875440118] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kastner M, Fackler P, Podbielski L, Charcoudian J, Clarke M. A dissymmetric μ-oxo technetium complex. Inorganica Chim Acta 1986. [DOI: 10.1016/s0020-1693(00)84578-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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