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Ernst MJ, Abdulkader A, Hagenbach A, Claude G, Roca Jungfer M, Abram U. [Tc(NO)(Cp)(PPh 3)Cl] and [Tc(NO)(Cp)(PPh 3)(NCCH 3)](PF 6), and Their Reactions with Pyridine and Chalcogen Donors. Molecules 2024; 29:1114. [PMID: 38474627 DOI: 10.3390/molecules29051114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 02/25/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
Reactions of the technetium(I) nitrosyl complex [Tc(NO)(Cp)(PPh3)Cl] with triphenylphosphine chalcogenides EPPh3 (E = O, S, Se), and Ag(PF6) in a CH2Cl2/MeOH mixture (v/v, 2/1) result in an exchange of the chlorido ligand and the formation of [Tc(NO)(Cp)(PPh3)(EPPh3)](PF6) compounds. The cationic acetonitrile complex [Tc(NO)(Cp)(PPh3)(NCCH3)]+ is formed when the reaction is conducted in NCCH3 without additional ligands. During the isolation of the corresponding PF6- salt a gradual decomposition of the anion was detected in the solvent mixture applied. The yields and the purity of the product increase when the BF4- salt is used instead. The acetonitrile ligand is bound remarkably strongly to technetium and exchange reactions readily proceed only with strong donors, such as pyridine or ligands with 'soft' donor atoms, such as the thioether thioxane. Substitutions on the cyclopentadienyl ring do not significantly influence the ligand exchange behavior of the starting material. 99Tc NMR spectroscopy is a valuable tool for the evaluation of reactions of the complexes of the present study. The extremely large chemical shift range of this method allows the ready detection of corresponding ligand exchange reactions. The observed 99Tc chemical shifts depend on the donor properties of the ligands. DFT calculations support the discussions about the experimental results and provide explanations for some of the unusual findings.
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Affiliation(s)
- Moritz Johannes Ernst
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, Germany
| | - Abdullah Abdulkader
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, Germany
| | - Adelheid Hagenbach
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, Germany
| | - Guilhem Claude
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, Germany
| | | | - Ulrich Abram
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, Germany
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Ernst MJ, Roca Jungfer M, Abram U. Reactions of Tc I(NO) and Tc VN Complexes with Alkynes and Alkynides. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00192] [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]
Affiliation(s)
- Moritz Johannes Ernst
- Institute of Chemistry and Biochemistry, Freie Universität Berlin,Fabeckstr. 34/36, D-14195 Berlin, Germany
| | - Maximilian Roca Jungfer
- Institute of Chemistry and Biochemistry, Freie Universität Berlin,Fabeckstr. 34/36, D-14195 Berlin, Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry, Freie Universität Berlin,Fabeckstr. 34/36, D-14195 Berlin, Germany
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Roca Jungfer M, Abram U. Unlocking Air- and Water-Stable Technetium Acetylides and Other Organometallic Complexes. Inorg Chem 2022; 61:7765-7779. [PMID: 35548933 DOI: 10.1021/acs.inorgchem.2c00070] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The first technetium complexes containing anionic alkynido ligands in an end-on coordination mode have been prepared by using the nonprotic, cationic precursor mer,trans-[Tc(SMe2)(CO)3(PPh3)2]+. This cation acts as a functional analogue of the highly reactive 16-electron metallo Lewis acid {Tc(CO)3(PPh3)2}+ in reactions with alkynes, acetylides, and other organometallic reagents. Such reactions give a variety of organometallic technetium complexes in excellent yields and enable the preparation of [Tc(CH3)(CO)3(PPh3)2], [Tc(Ph)(CO)3(PPh3)2], [Tc(Cp)(CO)2(PPh3)], [Tc(═CCH2CH2CH2O)(CO)3(PPh3)2]+, [Tc(═CCH2CH2CH2CH2O)(CO)3(PPh3)2]+, [Tc(C≡C-H)(CO)3(PPh3)2], [Tc(C≡C-Ph)(CO)3(PPh3)2], [Tc(C≡C-tBu)(CO)3(PPh3)2], [Tc(C≡C-nBu)(CO)3(PPh3)2], [Tc(C≡C-SiMe3)(CO)3(PPh3)2], and [Tc{C≡C-C6H3(CF3)2}(CO)3(PPh3)2]. The bonding situation in the alkynyl complexes is compared to that in corresponding alkyl- and arylnitrile and -isonitrile complexes. [Tc(N≡C-Ph)(CO)3(PPh3)2](BF4), [Tc(C≡N-Ph)(CO)3(PPh3)2](BF4), [Tc(N≡C-tBu)(CO)3(PPh3)2](BF4), and [Tc(C≡N-tBu)(CO)3(PPh3)2](BF4) were prepared in high yields by ligand exchange reactions starting from mer,trans-[Tc(OH2)(CO)3(PPh3)2](BF4). The novel complexes were characterized by single-crystal X-ray diffraction and spectroscopic methods. In particular, 99Tc nuclear magnetic resonance spectroscopy proved to be an invaluable and sensitive tool for the characterization of the complexes. Density functional theory calculations strongly suggest similar bonding situations for the related alkynyl, nitrile, and isonitrile complexes 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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Ernst MJ, Roca Jungfer M, Hagenbach A, Abram U. Triaryltechnetium(III) and Related Complexes. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Moritz Johannes Ernst
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstrasse 34/36, D-14195 Berlin, Germany
| | - Maximilian Roca Jungfer
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstrasse 34/36, D-14195 Berlin, Germany
| | - Adelheid Hagenbach
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstrasse 34/36, D-14195 Berlin, Germany
| | - Ulrich Abram
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstrasse 34/36, D-14195 Berlin, Germany
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Roca Jungfer M, Ernst MJ, Hagenbach A, Abram U. [{Tc
I
(NO)(L
OMe
)(PPh
3
)Cl}
2
Ag](PF
6
) and [Tc
II
(NO)(L
OMe
)(PPh
3
)Cl](PF
6
): Two Unusual Technetium Complexes with a “Kläui‐type” Ligand. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202100316] [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)
- Maximilian Roca Jungfer
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
| | - Moritz Johannes Ernst
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
| | - Adelheid Hagenbach
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
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6
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Abdulkader A, Hagenbach A, Abram U. [Tc(NO)Cl(Cp)(PPh
3
)] – A Technetium(I) Compound with an Unexpected Synthetic Potential. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100521] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Abdullah Abdulkader
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
- Present address: Justus-Liebig-University Gießen Ludwigstr. 23 35390 Gießen Germany
| | - Adelheid Hagenbach
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry Freie Universität Berlin Fabeckstr. 34/36 14195 Berlin Germany
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7
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Grunwald AC, Scholtysik C, Hagenbach A, Abram U. One Ligand, One Metal, Seven Oxidation States: Stable Technetium Complexes with the “Kläui Ligand”. Inorg Chem 2020; 59:9396-9405. [DOI: 10.1021/acs.inorgchem.0c01264] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna C. Grunwald
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Clemens Scholtysik
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Adelheid Hagenbach
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Ulrich Abram
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
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Claude G, Salsi F, Hagenbach A, Gembicky M, Neville M, Chan C, Figueroa JS, Abram U. Structural and Redox Variations in Technetium Complexes Supported by m-Terphenyl Isocyanides. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00238] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guilhem Claude
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Federico Salsi
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Adelheid Hagenbach
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
| | - Milan Gembicky
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Michael Neville
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Chinglin Chan
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Ulrich Abram
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstraße 34/36, D-14195 Berlin, Germany
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9
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Ackermann J, Abdulkader A, Scholtysik C, Jungfer MR, Hagenbach A, Abram U. [TcI(NO)X(Cp)(PPh3)] Complexes (X– = I–, I3–, SCN–, CF3SO3–, or CF3COO–) and Their Reactions. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00620] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Janine Ackermann
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, D-14195 Berlin, Germany
| | - Abdullah Abdulkader
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, D-14195 Berlin, Germany
| | - Clemens Scholtysik
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, D-14195 Berlin, Germany
| | - Maximilian Roca Jungfer
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstrasse 34-36, D-14195 Berlin, Germany
| | - Adelheid Hagenbach
- 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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Balasekaran SM, Hagenbach A, Drees M, Abram U. [Tc II(NO)(trifluoroacetate) 4F] 2- - synthesis and reactions. Dalton Trans 2018; 46:13544-13552. [PMID: 28952617 DOI: 10.1039/c7dt03084c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Fluoridotetrakis(trifluoroacetato)nitrosyltechnetate(ii) was prepared by the dissolution of Cs2[Tc(NO)F5] in trifluoroacetic acid and addition of (NBu4)F·3H2O. The compound crystallizes as a mixed Cs+/NBu4+ salt in the form of green crystals. Unlike the [Tc(NO)F5]2- salts, the product is soluble in organic solvents and can be used as a precursor for ongoing ligand exchange procedures with organic ligands. The corresponding reactions with triphenylphosphine (PPh3), 1,2-bis(diphenylphosphino)ethane (DPPE) or pyridyldiphenylphosphine (pyPPh2) give technetium(i) complexes of the compositions Cs[Tc(NO)(PPh3)2(CF3COO)2F], [Tc(NO)(DPPE)2(OOCCF3)](PF6) and [Tc(NO)(κN,P-pyPPh2)(κP-pyPPh2)(CF3COO)2]. The products were studied spectroscopically and by X-ray diffraction. The 99Tc NMR resonances of the novel Tc(i) nitrosyls appear between -627 and +952 ppm, which is at a remarkably high field and in the range where normally the signals of Tc(iii) compounds are observed.
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Affiliation(s)
- S M Balasekaran
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstr. 34/36, 14195 Berlin, Germany.
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Balasekaran SM, Hagenbach A, Spandl J, Abram U. The Reaction of Cs2
[Tc(NO)F5
] with BF3
in Acetonitrile: Formation and Structure of [{Tc(NO)(CH3
CN)4
}2
(μ-F)](BF4
)3. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Samundeeswari Mariappan Balasekaran
- Institute of Chemistry and Biochemistry; Freie Universität Berlin; Fabeckstr. 34/36 14195 Berlin Germany
- Department of Chemistry; University of Nevada Las Vegas; 89154 Las Vegas NV USA
| | - Adelheid Hagenbach
- Institute of Chemistry and Biochemistry; Freie Universität Berlin; Fabeckstr. 34/36 14195 Berlin Germany
| | - Johann Spandl
- Institute of Chemistry and Biochemistry; Freie Universität Berlin; Fabeckstr. 34/36 14195 Berlin Germany
| | - Ulrich Abram
- Institute of Chemistry and Biochemistry; Freie Universität Berlin; Fabeckstr. 34/36 14195 Berlin Germany
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