Mixed-ligand lanthanide complexes supported by ditopic bis(imino-methyl)-phenol/calix[4]arene macrocycles: synthesis, structures, and luminescence properties of [Ln2(L2)(MeOH)2] (Ln = La, Eu, Tb, Yb)
dc.bibliographicCitation.firstPage | 11179 | eng |
dc.bibliographicCitation.issue | 32 | eng |
dc.bibliographicCitation.journalTitle | Dalton Transactions | eng |
dc.bibliographicCitation.lastPage | 11191 | eng |
dc.bibliographicCitation.volume | 49 | eng |
dc.contributor.author | Ullmann, Steve | |
dc.contributor.author | Hahn, Peter | |
dc.contributor.author | Mini, Parvathy | |
dc.contributor.author | Tuck, Kellie L. | |
dc.contributor.author | Kahnt, Axel | |
dc.contributor.author | Abel, Bernd | |
dc.contributor.author | Gutierrez Suburu, Matias E. | |
dc.contributor.author | Strassert, Cristian A. | |
dc.contributor.author | Kersting, Berthold | |
dc.date.accessioned | 2021-09-28T06:09:45Z | |
dc.date.available | 2021-09-28T06:09:45Z | |
dc.date.issued | 2020 | |
dc.description.abstract | The lanthanide binding ability of a macrocyclic ligand H6L2 comprising two bis(iminomethyl)phenol and two calix[4]arene units has been studied. H6L2 is a ditopic ligand which provides dinuclear neutral complexes of composition [Ln2(L2)(MeOH)2] (Ln = La (1), Eu (2), Tb (3), and Yb (4)) in very good yield. X-ray crystal structure analyses for 2 and 3 show that (L2)6- accommodates two seven coordinated lanthanide ions in a distorted monocapped trigonal prismatic/octahedral coordination environment. UV-vis spectroscopic titrations performed with La3+, Eu3+, Tb3+ and Yb3+ ions in mixed MeOH/CH2Cl2 solution (I = 0.01 M NBu4PF6) reveal that a 2 : 1 (metal : ligand) stoichiometry is present in solution, with log K11 and K21 values ranging from 5.25 to 6.64. The ratio α = K11/K21 of the stepwise formation constants for the mononuclear (L2 + M = ML2, log K11) and the dinuclear complexes (ML2 + M = M2L2, log K21) was found to be invariably smaller than unity indicating that the binding of the first Ln3+ ion augments the binding of the second Ln3+ ion. The present complexes are less luminescent than other seven-coordinated Eu and Tb complexes, which can be traced to vibrational relaxation of excited EuIII and TbIII states by the coligated MeOH and H2O molecules and/or low-lying ligand-to-metal charge-transfer (LMCT) states. © 2020 The Royal Society of Chemistry. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/6918 | |
dc.identifier.uri | https://doi.org/10.34657/5965 | |
dc.language.iso | eng | eng |
dc.publisher | London : Soc. | eng |
dc.relation.doi | https://doi.org/10.1039/d0dt02303e | |
dc.relation.essn | 1477-9234 | |
dc.relation.essn | 1364-5447 | |
dc.relation.issn | 1477-9226 | |
dc.rights.license | CC BY-NC 3.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/3.0/ | eng |
dc.subject.ddc | 540 | eng |
dc.subject.other | Aromatic hydrocarbons | eng |
dc.subject.other | Charge transfer | eng |
dc.subject.other | Chelation | eng |
dc.subject.other | Crystal structure | eng |
dc.subject.other | Ions | eng |
dc.subject.other | Ligands | eng |
dc.subject.other | Luminescence | eng |
dc.subject.other | Phenols | eng |
dc.subject.other | Rare earth elements | eng |
dc.subject.other | Synthesis (chemical) | eng |
dc.subject.other | Terbium compounds | eng |
dc.subject.other | Coordination environment | eng |
dc.subject.other | Formation constants | eng |
dc.subject.other | Ligand-to-metal charge transfers | eng |
dc.subject.other | Luminescence properties | eng |
dc.subject.other | Macro-cyclic ligands | eng |
dc.subject.other | Mixed-ligand lanthanide | eng |
dc.subject.other | Vibrational relaxation | eng |
dc.subject.other | X-ray crystal structure analysis | eng |
dc.subject.other | Europium compounds | eng |
dc.title | Mixed-ligand lanthanide complexes supported by ditopic bis(imino-methyl)-phenol/calix[4]arene macrocycles: synthesis, structures, and luminescence properties of [Ln2(L2)(MeOH)2] (Ln = La, Eu, Tb, Yb) | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | eng |
wgl.contributor | IOM | eng |
wgl.subject | Chemie | eng |
wgl.type | Zeitschriftenartikel | eng |
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