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Taming 2,2’-biimidazole ligands in trivalent chromium complexes†
dc.contributor.author | Chong, Julien | |
dc.contributor.author | Benchohra, Amina | |
dc.contributor.author | Besnard, Céline | |
dc.contributor.author | Guénée, Laure | |
dc.contributor.author | Rosspeintner, Arnulf | |
dc.contributor.author | Cruz, Carlos M. | |
dc.contributor.author | Jiménez Gallego, Juan Ramón | |
dc.contributor.author | Piguet, Claude | |
dc.date.accessioned | 2024-09-02T08:51:48Z | |
dc.date.available | 2024-09-02T08:51:48Z | |
dc.date.issued | 2024-07-06 | |
dc.identifier.citation | Chong, J. et. al. Dalton Trans., 2024. [https://doi.org/10.1039/D4DT01608D] | es_ES |
dc.identifier.uri | https://hdl.handle.net/10481/93747 | |
dc.description.abstract | Complete or partial replacement of well-known five-membered chelating 2,2’-bipyridine (bipy) or 1,10- phenanthroline (phen) ligands with analogous didentate 2,2’-biimidazole (H2biim) provides novel perspectives for exploiting the latter pH-tuneable bridging unit for connecting inert trivalent chromium with cationic partners. The most simple homoleptic complex [Cr(H2biim)3]3+ and its stepwise deprotonated analogues are only poorly soluble in most solvents and their characterization is limited to some solidstate structures, in which the pseudo-octahedral [CrN6] units are found to be intermolecularly connected via peripheral N–H⋯X hydrogen bonds. Moreover, the associated high-energy stretching N–H vibrations drastically quench the targeted near infrared (NIR) CrIII-based phosphorescence, which makes these homoleptic building blocks incompatible with the design of molecular-based luminescent assemblies. Restricting the number of bound 2,2’-biimidazole ligands to a single unit in the challenging heteroleptic [Cr(phen)2(Hxbiim)](1+x)+ (x = 2–0) complexes overcomes the latter limitations and allows (i) the synthesis and characterization of these [CrN6] chromophores in the solid state and in solution, (ii) the stepwise and controlled deprotonation of the bound 2,2’-biimidazole ligand and (iii) the implementation of Cr-centered phosphorescence with energies, lifetimes and quantum yields adapted for using the latter chromophores as sensitizers in promising ‘complex-as-ligand’ strategies. | es_ES |
dc.description.sponsorship | Swiss National Science Foundation is gratefully acknowledged (grant 200020_207313) | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Royal Society of Chemistry | es_ES |
dc.rights | Atribución 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.title | Taming 2,2’-biimidazole ligands in trivalent chromium complexes† | es_ES |
dc.type | journal article | es_ES |
dc.rights.accessRights | open access | es_ES |
dc.identifier.doi | 10.1039/D4DT01608D | |
dc.type.hasVersion | VoR | es_ES |