Visible and near-infrared emission from lanthanoid β-triketonate assemblies incorporating cesium cations

Galan, Laura Abad, Reid, Brodie L., Stagni, Stefano, Sobolev, Alexandre N., Skelton, Brian W., Cocchi, Massimo, Malicka, Joanna M., Zysman-Colman, Eli, Moore, Evan G. , Ogden, Mark I. and Massi, Massimiliano (2017) Visible and near-infrared emission from lanthanoid β-triketonate assemblies incorporating cesium cations. Inorganic Chemistry, 56 15: 8975-8985. doi:10.1021/acs.inorgchem.7b00928


Author Galan, Laura Abad
Reid, Brodie L.
Stagni, Stefano
Sobolev, Alexandre N.
Skelton, Brian W.
Cocchi, Massimo
Malicka, Joanna M.
Zysman-Colman, Eli
Moore, Evan G.
Ogden, Mark I.
Massi, Massimiliano
Title Visible and near-infrared emission from lanthanoid β-triketonate assemblies incorporating cesium cations
Journal name Inorganic Chemistry   Check publisher's open access policy
ISSN 1520-510X
0020-1669
Publication date 2017-08-07
Sub-type Article (original research)
DOI 10.1021/acs.inorgchem.7b00928
Open Access Status DOI
Volume 56
Issue 15
Start page 8975
End page 8985
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The reaction of the β-triketonate ligands tris(4-methylbenzoyl)methanide and tribenzoylmethanide with the trivalent lanthanoids Eu3+, Er3+, and Yb3+ in the presence of Cs+ afforded polymeric structures where the repeating units are represented by bimetallic tetranuclear assemblies of formulation {[Ln(Cs)(β-triketonate)4]2}n. The only exception is the structure formed by the reaction of tris(4-methylbenzoyl)methanide, Yb3+, and Cs+, which yielded a polymeric assembly where the repeating units are mononuclear Yb3+ complexes bridged by Cs+ cations. Photophysical measurements on the obtained materials confirmed efficient sensitization from the ligand excited states to the 4f* excited states of the three lanthanoids. According to transient absorption data, Er3+ and Yb3+ are sensitized via energy transfer from the triplet state of the β-triketonate ligands. On the other hand, energy transfer to Eu3+ seems to occur via an alternative pathway, possibly directly via the singlet state or through ligand to metal charge transfer states. The emission measurements confirm efficient sensitization for all three lanthanoids and bright near-infrared emission for Er3+ and Yb3+, a characteristic that seems to be linked to the specific chemical structure of the β-triketonate ligands.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Chemistry and Molecular Biosciences
 
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