| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Sharrad, Clint A.
University of Manchester
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2023Development of a Multi-technique Characterization Portfolio for Stainless Steels Exposed to Magnox Reprocessing Liquorscitations
- 2023Long-Term Aqueous Contamination of Stainless Steel in Simulant Nuclear Reprocessing Environmentscitations
- 2022Encapsulation of iodine-loaded metallated silica materials by a geopolymer matrixcitations
- 2018Preparation of uranium(III) in a molten chloride salt – a redox mechanistic studycitations
- 2017Understanding Uranium Binding Mechanisms and Speciation on Stainless Steel - 17462
- 2015Gamma irradiation resistance of an early age slag-blended cement matrix for nuclear waste encapsulationcitations
- 2007Spectroelectrochemical studies of uranium and neptunium in LiCl-KCl eutectic meltcitations
- 2003Embracing ligands. A synthetic strategy towards new nitrogen-thioether multidentate ligands and characterization of the cobalt(III) complexescitations
- 2003Characterization of [Fe(AMN3S3sarH)]3+ - A rigorously low-spin iron(II) complexcitations
Places of action
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article
Embracing ligands. A synthetic strategy towards new nitrogen-thioether multidentate ligands and characterization of the cobalt(III) complexes
Abstract
The synthesis of the hexadentate ligand 2,2,9,9-tetra(methyleneamine)-4,7-dithiadecane (EtN4S2amp) is reported. The ligand is of a type in which bifurcations of the chain occur at atoms other than donor atoms. The cobalt(III) complex [Co(EtN4S2amp)]3+ (1) was isolated and characterized. The synthetic methodology also results in a number of by-products, notably 2,9,9-tris(methyleneamine)-9-methylenehydroxy-4,7-dithiadecane (Et(HO)N3S2amp) and an eleven-membered pendant arm macrocyclic ligand 6,10-dimethyl-6,10-bis(methyleneamine)-1,4-dithia-8-azaacyclo-undec-7-ene (dmatue). The complexes [Co(Et(HO)N3S2amp)]3+ (2), in which the alcohol is coordinated to the metal ion, and [Co(dmatue)Cl]2+ (4) were isolated and characterized. Et(HO)N3S2amp also undergoes complexation with cobalt(III) to produce two isomers endo-[Co(Et(HO)N3S2amp)Cl]2+ (endo-3) and exo-[Co(Et(HO)N3 S2amp)Cl]2+ (exo-3), both with an uncoordinated alcohol group, endo-3 has the alcohol positioned cis, and exo-3 trans, to the sixth metal coordination site. Reaction of 1 with isobutyraldehyde, paraformaldehyde and base in dimethylformamide results in the encapsulated complex [Co(1,5,5,9,13,13-hexamethyl-18,21-dithia-3,7,11,15-tetraazabicyclo[7.7.6]- docosa-3,14-diene)](ClO4)3·2H2 O([Co(Me6docosadieneN4S2)]3+ (5). All complexes have been characterized by single crystal X-ray study. The low-temperature (11 K) absorption spectrum of 1 has been measured in Nafion films with spin-allowed 1A1g → 1T1g and 1A1g → 1T2g and spin forbidden 1A1g → 3T1g and 1A1g → 3T2g bands observed. The octahedral ligand-field parameters were determined (10 Dq = 22570 cm-1, B = 551 cm-1; B = 551 cm-1; C = 3500 cm-1). For 5 10Dq and B were determined (20580 cm-1; 516 cm-1, respectively) and compared with those for similar expanded cavity complexes [Co(Me8tricosatrieneN6)]3+ and [Co(Me5tricosatrieneN6)]3+.