1
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Olasunkanmi LO, Govender PP. Theoretical probe of absorption and fluorescence emission characteristics of highly luminescent ReL(CO)3X (L = 12H-indazolo[5,6-f][1,10]phenanthroline and X = F, Cl, Br, I): a DFT/TD-DFT study. Mol Phys 2021. [DOI: 10.1080/00268976.2021.2018062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Lukman O. Olasunkanmi
- Department of Chemical Sciences, University of Johannesburg Johannesburg, South Africa
- Department of Chemistry, Faculty of Science, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Penny P. Govender
- Department of Chemical Sciences, University of Johannesburg Johannesburg, South Africa
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2
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The kinetic substitution reactions and structural analysis of manganese(I) acetylacetonato complexes. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Mokolokolo PP, Brink A, Roodt A, Schutte-Smith M. Subtle variation of stereo-electronic effects in rhodium(I) carbonyl Schiff base complexes and their iodomethane oxidative addition kinetics. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1809657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Pennie P. Mokolokolo
- Department of Chemistry, University of the Free State, Bloemfontein, South Africa
| | - Alice Brink
- Department of Chemistry, University of the Free State, Bloemfontein, South Africa
| | - Andreas Roodt
- Department of Chemistry, University of the Free State, Bloemfontein, South Africa
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4
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Schutte-Smith M, Roodt A, Visser HG. Ambient and high-pressure kinetic investigation of methanol substitution in fac-[Re(Trop)(CO)3(MeOH)] by different monodentate nucleophiles. Dalton Trans 2019; 48:9984-9997. [DOI: 10.1039/c9dt01528k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
First report of high-pressure methanol substitution by entering monodentate L forms fac-[Re(CO)3(Trop)(L)] {ΔV≠(kL) = +9 – +14 cm−3 mol−1}, indicating dissociative/dissociative interchange activation.
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Affiliation(s)
| | - Andreas Roodt
- Department of Chemistry
- University of the Free State
- PO Box 339
- Bloemfontein
- South Africa
| | - Hendrik G. Visser
- Department of Chemistry
- University of the Free State
- PO Box 339
- Bloemfontein
- South Africa
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5
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Nkoe PI, Visser HG, Swart C, Brink A, Schutte-Smith M. Synthesis of Re I tricarbonyl complexes with various sulfur- and oxygen-donating ligands: crystal structures of two Re I dinuclear structures bridged by S atoms. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:1116-1122. [PMID: 30284976 DOI: 10.1107/s205322961801207x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 08/24/2018] [Indexed: 11/10/2022]
Abstract
The synthesis and characterization of two dinuclear complexes, namely fac-hexacarbonyl-1κ3C,2κ3C-(pyridine-1κN)[μ-2,2'-sulfanediyldi(ethanethiolato)-1κ2S1,S3:2κ3S1,S2,S3]dirhenium(I), [Re2(C4H8S3)(C5H5N)(CO)6], (1), and tetraethylammonium fac-tris(μ-2-methoxybenzenethiolato-κ2S:S)bis[tricarbonylrhenium(I)], (C8H20N)[Re2(C7H7OS)3(CO)6], (2), together with two mononuclear complexes, namely (2,2'-bithiophene-5-carboxylic acid-κ2S,S')bromidotricarbonylrhenium(I), (3), and bromidotricarbonyl(methyl benzo[b]thiophene-2-carboxylate-κ2O,S)rhenium(I), (4), are reported. Crystals of (1) and (2) were characterized by X-ray diffraction. The crystal structure of (1) revealed two Re-S-Re bridges. The thioether S atom only bonds to one of the ReI metal centres, while the geometry of the second ReI metal centre is completed by a pyridine ligand. The structure of (2) is characterized by three S-atom bridges and an Re...Re nonbonding distance of 3.4879 (5) Å, which is shorter than the distance found for (1) [3.7996 (6)/3.7963 (6) Å], but still clearly a nonbonding distance. Complex (1) is stabilized by six intermolecular hydrogen-bond interactions and an O...O interaction, while (2) is stabilized by two intermolecular hydrogen-bond interactions and two O...π interactions.
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Affiliation(s)
- Pheello I Nkoe
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, Free State, 9301, South Africa
| | - Hendrik G Visser
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, Free State, 9301, South Africa
| | - Chantel Swart
- Department of Microbial, Biochemical and Food Biotechnology, University of the Free State, PO Box 339, Bloemfontein, Free State, 9301, South Africa
| | - Alice Brink
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, Free State, 9301, South Africa
| | - Marietjie Schutte-Smith
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, Free State, 9301, South Africa
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6
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Nuclearity manipulation in Schiff-base fac-tricarbonyl complexes of Mn(I) and Re(I). Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.10.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Brink A, Kroon RE, Visser HG, van Rensburg CEJ, Roodt A. Designing model imino bifunctional chelators for radiopharmaceuticals – in vitro antitumor activity, photoluminescence and structural analysis. NEW J CHEM 2018. [DOI: 10.1039/c7nj04208f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Designed bifunctional chelators for the radionuclides of 188/186Re or 99mTc. Structure, DFT calculations, antitumor and imaging properties are described.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State
- Bloemfontein 9300
- South Africa
| | - Robin E. Kroon
- Department of Physics, University of the Free State
- Bloemfontein 9300
- South Africa
| | - Hendrik G. Visser
- Department of Chemistry, University of the Free State
- Bloemfontein 9300
- South Africa
| | | | - Andreas Roodt
- Department of Chemistry, University of the Free State
- Bloemfontein 9300
- South Africa
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8
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Malaza S, Govender P, Schutte‐Smith M, Visser HG, Smith GS. Synthesis and Substitution Kinetics of Tricarbonylrhenium(I) Dendritic Complexes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700661] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Siphelele Malaza
- Department of Chemistry University of Cape Town Rondebosch 7701 Cape Town South Africa
| | - Preshendren Govender
- Department of Chemistry University of Cape Town Rondebosch 7701 Cape Town South Africa
| | - Marietjie Schutte‐Smith
- Department of Chemistry University of the Free State P. O. Box 339 9300 Bloemfontein South Africa
| | - Hendrik G. Visser
- Department of Chemistry University of the Free State P. O. Box 339 9300 Bloemfontein South Africa
| | - Gregory S. Smith
- Department of Chemistry University of Cape Town Rondebosch 7701 Cape Town South Africa
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9
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Hernández-Valdés D, Rodríguez-Riera Z, Díaz-García A, Benoist E, Jáuregui-Haza U. Influence of the chelator structures on the stability of Re and Tc tricarbonyl complexes with iminodiacetic acid tridentate ligands: a computational study. J Mol Model 2016; 22:179. [PMID: 27406231 DOI: 10.1007/s00894-016-3043-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 06/20/2016] [Indexed: 11/25/2022]
Abstract
The development of novel radiopharmaceuticals for nuclear medicine based on M(CO)3 (M = Tc, Re) complexes has attracted great attention. The versatility of this core and the easy production of the fac-[M(CO)3(H2O)3](+) precursor could explain this interest. The main characteristics of these tricarbonyl complexes are the high substitution stability of the three CO ligands and the corresponding lability of the coordinated water molecules, yielding, via easy exchange of a variety of bi- and tridentate ligands, complexes xof very high kinetic stability. Here, a computational study of different tricarbonyl complexes of Re(I) and Tc(I) was performed using density functional theory. The solvent effect was simulated using the polarizable continuum model. These structures were used as a starting point to investigate the relative stabilities of tricarbonyl complexes with various tridentate ligands. These complexes included an iminodiacetic acid unit for tridentate coordination to the fac-[M(CO)3](+) moiety (M = Re, Tc), an aromatic ring system bearing a functional group (-NO2, -NH2, and -Cl) as a linking site model, and a tethering moiety (a methylene, ethylene, propylene butylene, or pentylene bridge) between the linking and coordinating sites. The optimized complexes showed geometries comparable to those inferred from X-ray data. In general, the Re complexes were more stable than the corresponding Tc complexes. Furthermore, using NH2 as the functional group, a medium length carbon chain, and ortho substitution increased complex stability. All of the bonds involving the metal center presented a closed shell interaction with dative or covalent character, and the strength of these bonds decreased in the sequence Tc-CO > Tc-O > Tc-N.
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Affiliation(s)
- Daniel Hernández-Valdés
- Instituto Superior de Tecnología y Ciencias Aplicadas, 6163, Avenida Salvador Allende No 1110 entre Infanta y Avenida Rancho Boyeros, Quinta de los Molinos, La Habana, 10600, Cuba
| | - Zalua Rodríguez-Riera
- Instituto Superior de Tecnología y Ciencias Aplicadas, 6163, Avenida Salvador Allende No 1110 entre Infanta y Avenida Rancho Boyeros, Quinta de los Molinos, La Habana, 10600, Cuba
| | - Alicia Díaz-García
- Facultad de Química, Universidad de La Habana, Zapata esquina G, 10400, La Habana, Cuba
| | - Eric Benoist
- Université de Toulouse, 118, avenue de Rangueil, 31062, Toulouse, France
| | - Ulises Jáuregui-Haza
- Instituto Superior de Tecnología y Ciencias Aplicadas, 6163, Avenida Salvador Allende No 1110 entre Infanta y Avenida Rancho Boyeros, Quinta de los Molinos, La Habana, 10600, Cuba.
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10
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Mokolokolo PP, Brink A, Visser HG. Crystal structure of bis(μ 2-2-((3-methylphenyl)imino)methylphenolato-κ 2
N, O: O)hexacarbonyldimanganese(I), C 34H 24Mn 2N 2O 8. Z KRIST-NEW CRYST ST 2016. [DOI: 10.1515/ncrs-2015-0210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C34H24Mn2N2O8, triclinic, P1̅ (no. 2) a = 7.737(5) Å, b = 9.483(5) Å, c = 11.309(5) Å, β = 102.514(5)°, V = 766.6(7) Å3, Z = 1, R
gt
(F) = 0.0478, wR
ref
(F
2
) = 0.1297, T = 100(2) K
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Affiliation(s)
- Pennie P. Mokolokolo
- Department of Chemistry, University of the Free State, Nelson Mandela ave, Bloemfontein, South Africa
| | - Alice Brink
- Department of Chemistry, University of the Free State, Nelson Mandela ave, Bloemfontein, South Africa
| | - Hendrik G. Visser
- Department of Chemistry, University of the Free State, Nelson Mandela ave, Bloemfontein, South Africa
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11
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Marake DT, Roodt A, Brink A. Crystal structure of fac-tricarbonyl(2-(isopropylimino)methyl-5-methylphenolatido-κ 2
N, O)(pyridine-κ N)rhenium(I), C 19H 19N 2O 4Re. Z KRIST-NEW CRYST ST 2016. [DOI: 10.1515/ncrs-2015-0110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C19H19N2O4Re, Monoclinic, P21/c (no. 14), a = 8.2805(3) Å, b = 13.7325(5) Å, c = 16.3560(6) Å, β = 92.431(2)°, V = 1858.2(2) Å3, Z = 4, R
gt
(F) = 0.0347, wR
ref
(F
2
) = 0.0930, T = 100 K.
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Affiliation(s)
- Daniel Thabo Marake
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
| | - Andreas Roodt
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
| | - Alice Brink
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
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12
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Hernández-Valdés D, Alberto R, Jáuregui-Haza U. Quantum chemistry calculations of technetium and rhenium compounds with application in radiopharmacy: review. RSC Adv 2016. [DOI: 10.1039/c6ra23142j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Quantum chemistry calculations are a powerful tool in the development of new 99mTc and 186/188Re radiopharmaceuticals.
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Affiliation(s)
- Daniel Hernández-Valdés
- Instituto Superior de Tecnologías y Ciencias Aplicadas
- Universidad de La Habana
- La Habana
- Cuba
- Department of Chemistry
| | - Roger Alberto
- Department of Chemistry
- University of Zürich
- CH-8057 Zürich
- Switzerland
| | - Ulises Jáuregui-Haza
- Instituto Superior de Tecnologías y Ciencias Aplicadas
- Universidad de La Habana
- La Habana
- Cuba
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13
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Manicum A, Schutte-Smith M, Kemp G, Visser H. Illustration of the electronic influence of coordinated β-diketone type ligands: A kinetic and structural study. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Brink A, Visser HG, Roodt A. Solid state isostructural behavior and quantified limiting substitution kinetics in Schiff-base bidentate ligand complexes fac-[Re(O,N-Bid)(CO)3(MeOH)](n). Inorg Chem 2014; 53:12480-8. [PMID: 25393647 DOI: 10.1021/ic5019168] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A range of N,O-donor atom salicylidene complexes of the type fac-[M(O,N-Bid)(CO)3(L)](n) (O,N-Bid = anionic N,O-bidentate ligands; L = neutral coordinated ligand) have been studied. The unique feature of the complexes which crystallize in a monoclinic isostructural space group for complexes containing methanol in the sixth position (L = MeOH) is highlighted. The reactivity and stability of the complexes were evaluated by rapid stopped-flow techniques, and the methanol substitution by a range of pyridine type ligands indicates significant activation by the N,O-salicylidene type of bidentate ligands as observed from the variation in the second-order rate constants. In particular, following the introduction of the sterically demanding and electron rich cyclohexyl salicylidene moiety on the bidentate ligand, novel limiting kinetic behavior is displayed by all entering ligands, thus enabling a systematic probe and manipulation of the limiting kinetic constants. Clear evidence of an interchange type of intimate mechanism for the methanol substitution is produced. The equilibrium and rate constants (25 °C) for the two steps in the dissociative interchange mechanism for methanol substitution in fac-[Re(Sal-Cy)(CO)3(MeOH)] (5) by the pyridine type ligands 3-chloropyridine, pyridine, 4-picoline, and DMAP are k3 (s(-1)), 40 ± 4, 13 ± 2, 10.4 ± 0.7, and 2.11 ± 0.09, and K2 (M(-1)), 0.13 ± 0.01, 0.21 ± 0.03, 0.26 ± 0.02, and 1.8 ± 0.1, respectively.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State , P.O. Box 339, Bloemfontein 9300, South Africa
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15
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Venter GJ, Steyl G, Roodt A. Solid state and theoretical study of structural properties induced by step-wise chloro functionalization in dicarbonyl-[2-(phenylamino)pent-3-en-4-onato]rhodium(I) complexes. J COORD CHEM 2014. [DOI: 10.1080/00958972.2013.878801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Gideon Steyl
- Department of Chemistry, University of the Free State, Bloemfontein, South Africa
| | - Andreas Roodt
- Department of Chemistry, University of the Free State, Bloemfontein, South Africa
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16
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Brink A, Visser HG, Roodt A. Activation of rhenium(I) toward substitution in fac-[Re(N,O'-Bid)(CO)3(HOCH3)] by Schiff-base bidentate ligands (N,O'-Bid). Inorg Chem 2013; 52:8950-61. [PMID: 23883066 DOI: 10.1021/ic401115j] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of fac-[Re(N,O'-Bid)(CO)3(L)] (N,O'-Bid = monoanionic bidentate Schiff-base ligands with N,O donor atoms; L = neutral monodentate ligand) has been synthesized, and the methanol substitution reactions have been investigated. The complexes were characterized by NMR, IR, and UV-vis spectroscopy. X-ray crystal structures of the compounds fac-[Re(Sal-mTol)(CO)3(HOCH3)], fac-[Re(Sal-pTol)(CO)3(HOCH3)], fac-[Re(Sal-Ph)(CO)3(HOCH3)], and fac-[Re(Sal-Ph)(CO)3(Py)] (Sal-mTol = 2-(m-tolyliminomethyl)phenolato; Sal-pTol = 2-(p-tolyliminomethyl)phenolato; Sal-Ph = 2-(phenyliminomethyl)phenolato; Py = pyridine) are reported. Significant activation for the methanol substitution is induced by the use of the N,O bidentate ligand as manifested by the second order rate constants, with limiting kinetics being observed for the first time. Rate constants (25 °C) (k1 or k3) and activation parameters (ΔHk‡, kJ mol(-1); ΔSk‡, J K(-1) mol(-1)) from Eyring plots for entering nucleophiles as indicated are as follows: fac-[Re(Sal-mTol)(CO)3(HOCH3)] 3-chloropyridine: (k1) 2.33 ± 0.01 M(-1) s(-1); 85.1 ± 0.6, 48 ± 2; fac-[Re(Sal-mTol)(CO)3(HOCH3)] pyridine: (k1) 1.29 ± 0.02 M(-1) s(-1); 92 ± 2, 66 ± 7; fac-[Re(Sal-mTol)(CO)3(HOCH3)] 4-picoline: (k1) 1.27 ± 0.05 M(-1) s(-1); 88 ± 2, 53 ± 6; (k3) 3.9 ± 0.03 s(-1); 78 ± 8, 30 ± 27; (kf) 1.7 ± 0.02 M(-1) s(-1); 86 ± 2, 49 ± 6; fac-[Re(Sal-mTol)(CO)3(HOCH3)] DMAP (k3) 1.15 ± 0.02 s(-1); 88 ± 2, 52 ± 7. An interchange dissociative mechanism is proposed.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
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17
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Novel imino rhenium(I) tricarbonyl complexes of salicylidene-derived ligands: Synthesis, X-ray crystallographic studies, spectroscopic characterization and DFT calculations. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.08.059] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Wilhelms N, Kulchat S, Lehn JM. Organocatalysis of CN/CN and CC/CN Exchange in Dynamic Covalent Chemistry. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200515] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Schutte M, Roodt A, Visser HG. Coordinated Aqua vs Methanol Substitution Kinetics in fac-Re(I) Tricarbonyl Tropolonato Complexes. Inorg Chem 2012; 51:11996-2006. [PMID: 23088314 DOI: 10.1021/ic301891u] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marietjie Schutte
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South
Africa
| | - Andreas Roodt
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South
Africa
| | - Hendrik G. Visser
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South
Africa
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20
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Brink A, Visser HG, Roodt A. 4-Fluoro-2-[(3-methyl-phen-yl)imino-meth-yl]phenol. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o1071. [PMID: 22589937 PMCID: PMC3344028 DOI: 10.1107/s1600536812010513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 03/09/2012] [Indexed: 11/29/2022]
Abstract
The title compound, C14H12FNO, crystallizes as the trans phenol–imine tautomer. The two benzene rings are essentially coplanar, being inclined to one another by 9.28 (7)°. This is at least in part due to the intramolecular O—H⋯N hydrogen bond between the hydroxy O atom and the imine N atom. The crystal structure is stabilized by an array of weak C—H⋯O and C—H⋯F interactions, which link the molecules into a stable three-dimensional network.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein 9300, South Africa
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21
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Xia H, Liu X, Wu Q, Zhang Y, Gao W, Mu Y. Synthesis, structure, and luminescence of rhenium(I) complexes with substituted bipyridines. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.671479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Hong Xia
- a State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun 130012 , People's Republic of China
| | - Xiaoming Liu
- a State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun 130012 , People's Republic of China
- b State Key Laboratory of Supramolecular Structure and Materials, School of Chemistry, Jilin University , Changchun 130012 , People's Republic of China
| | - Qiaolin Wu
- b State Key Laboratory of Supramolecular Structure and Materials, School of Chemistry, Jilin University , Changchun 130012 , People's Republic of China
| | - Yuwei Zhang
- b State Key Laboratory of Supramolecular Structure and Materials, School of Chemistry, Jilin University , Changchun 130012 , People's Republic of China
| | - Wei Gao
- b State Key Laboratory of Supramolecular Structure and Materials, School of Chemistry, Jilin University , Changchun 130012 , People's Republic of China
| | - Ying Mu
- b State Key Laboratory of Supramolecular Structure and Materials, School of Chemistry, Jilin University , Changchun 130012 , People's Republic of China
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22
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Schutte M, Kemp G, Visser HG, Roodt A. Tuning the reactivity in classic low-spin d6 rhenium(I) tricarbonyl radiopharmaceutical synthon by selective bidentate ligand variation (L,L'-Bid; L,L'= N,N', N,O, and O,O' donor atom sets) in fac-[Re(CO)3(L,L'-Bid)(MeOH)]n complexes. Inorg Chem 2011; 50:12486-98. [PMID: 22111710 DOI: 10.1021/ic2013792] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A range of fac-[Re(CO)(3)(L,L'-Bid)(H(2)O)](n) (L,L'-Bid = neutral or monoanionic bidentate ligands with varied L,L' donor atoms, N,N', N,O, or O,O': 1,10-phenanthroline, 2,2'-bipydine, 2-picolinate, 2-quinolinate, 2,4-dipicolinate, 2,4-diquinolinate, tribromotropolonate, and hydroxyflavonate; n = 0, +1) has been synthesized and the aqua/methanol substitution has been investigated. The complexes were characterized by UV-vis, IR and NMR spectroscopy and X-ray crystallographic studies of the compounds fac-[Re(CO)(3)(Phen)(H(2)O)]NO(3)·0.5Phen, fac-[Re(CO)(3)(2,4-dQuinH)(H(2)O)]·H(2)O, fac-[Re(CO)(3)(2,4-dQuinH)Py]Py, and fac-[Re(CO)(3)(Flav)(CH(3)OH)]·CH(3)OH are reported. A four order-of-magnitude of activation for the methanol substitution is induced as manifested by the second order rate constants with (N,N'-Bid) < (N,O-Bid) < (O,O'-Bid). Forward and reverse rate and stability constants from slow and stopped-flow UV/vis measurements (k(1), M(-1) s(-1); k(-1), s(-1); K(1), M(-1)) for bromide anions as entering nucleophile are as follows: fac-[Re(CO)(3)(Phen)(MeOH)](+) (50 ± 3) × 10(-3), (5.9 ± 0.3) × 10(-4), 84 ± 7; fac-[Re(CO)(3)(2,4-dPicoH)(MeOH)] (15.7 ± 0.2) × 10(-3), (6.3 ± 0.8) × 10(-4), 25 ± 3; fac-[Re(CO)(3)(TropBr(3))(MeOH)] (7.06 ± 0.04) × 10(-2), (4 ± 1) × 10(-3), 18 ± 4; fac-[Re(CO)(3)(Flav)(MeOH)] 7.2 ± 0.3, 3.17 ± 0.09, 2.5 ± 2. Activation parameters (ΔH(k1)(++), kJmol(-1); ΔS(k1)(), J K(-1) mol(-1)) from Eyring plots for entering nucleophiles as indicated are as follows: fac-[Re(CO)(3)(Phen)(MeOH)](+) iodide 70 ± 1, -35 ± 3; fac-[Re(CO)(3)(2,4-dPico)(MeOH)] bromide 80.8 ± 6, -8 ± 2; fac-[Re(CO)(3)(Flav)(MeOH)] bromide 52 ± 5, -52 ± 15. A dissociative interchange mechanism is proposed.
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Affiliation(s)
- Marietjie Schutte
- Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
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